MINISCRIBE VIII
PRODUCT MANUAL
MODELS 8212, 8412, 8425 AND 8438
P/N 1010
Revision W
September 21, 1989
(Subject to Change Without Notice)
OBSOLETE PER EC #75149, 7/19/90
NOT REPLACED
OBSOLETE PER EC #74159 7/19/90
NOT REPLACED
MiniScribe Corporation
1861 Lefthand Circle
Longmont, Colorado 80501
(303) 651-6000 REVISIONS MANUAL NO.
1010
|----|--------|-------|-------------------------------|--------|
| RV | EC NO. | SECT. | DESCRIPTION | DATE |
|----|--------|-------|-------------------------------|--------|
| A | 70500 | ALL | Initial Release to Pre-Prodct.|09/17/84|
|----|--------|-------|-------------------------------|--------|
| B | 70510 | 2 | Redrew Figure 2-1. |12/06/84|
| | | 5 | Reworded Sections 5.4.1 and | |
| | | | 5.5, Redrew Figure 5-6. | |
| | | | Redrew Figure 9-1. | |
|----|--------|-------|-------------------------------|--------|
| C | 70524 | 2.3 | Changed 12 watts to 11 watts. |01/09/85|
| | | 2.6 | Added "at 35 deg. C" to MTBF; | |
| | | | added defects/surface cri- | |
| | | | teria; moved 8412 criteria | |
| | | | to be with 8425; added "and | |
| | | | One" to Cylinder Zero Defect | |
| | | | Free under 8425 and 8412. | |
| | | 2.7 | Changed 20 to 15 (Start Time).| |
| | | 2.8 | Changed 4 G's to 10 G's | |
| | | | (Operational Shock) | |
| | | 2.10 | Changed 50 dBA to 45 dBA. | |
| | | 2 | Redrew Figure 2-1. | |
| | | 5.4.1 | Reworded section. | |
|----|--------|-------|-------------------------------|--------|
| D | 70545 | 2.8 | Changed 32 to 28 Hz in Non- |02/26/85|
| | | | Operational Vibration (2 | |
| | | | places; changed 28 to 10 Hz | |
| | | | in Operational Vibration | |
| | | | (2 places). | |
|----|--------|-------|-------------------------------|--------|
| E | 70562 | 2.6 | Changed 8412 media defect |07/02/85|
| | | | criteria to be same as 8212. | |
|----|--------|-------|-------------------------------|--------|
| F | 70573 |2.1,2.2| Change reflects drive upgrade |10/23/85|
| | |2.3,2.5| and industry standards. | |
| | |2.6,2.8| | |
| | | 5.1.4 | | |
| | |FIG 2-1| | |
| | |FIG 5-3| | |
|----|--------|-------|-------------------------------|--------|
| G | 70598 | 2.6 | Added superscripts to Data |03/10/86|
| | | | Reliability specs. | |
| | | 2.1 | Changed model specs. | |
| | | 5 | Changed Table 5-1 | |
| | | 5.3.1| Reworded 2nd paragraph | |
|----|--------|-------|-------------------------------|--------|
| H | 70619 | 2.11 | Added FCC Warning |05/23/86|
| | | 8.1 | Changed Drawings to Reflect | |
| | | | Correct Packaging. | |
| | | 4.1 | 15 sec. was 20 sec. | |
| | | 5.2.5| | |
|----|--------|-------|-------------------------------|--------| REVISIONS MANUAL NO.
1010
|----|--------|-------|-------------------------------|--------|
| RV | EC NO. | SECT. | DESCRIPTION | DATE |
|----|--------|-------|-------------------------------|--------|
| J | 70655 | 2.1 | Deleted Data Tracks on Model |O8/20/86|
| | | | specs. | |
| | |Fig 2-1| Changed to reflect Universal | |
| | | | Board | |
| | | 5.1.2 | Changed 2 to 2 | |
| | |Fig 5-5| Changed 25-50ns to 50-100ns, | |
| | | | added T7, T8 | |
| | | 5.4.1 | Updated customer options to | |
| | | | reflect Universal Board | |
| | | 9.0 | Add paragraph 3 to cautions | |
| | |Fig 9-1| Changed to reflect Universal | |
| | | | Board | |
|----|--------|-------|-------------------------------|--------|
| K | 70649 | ALL | Added 8435/38 to Manual |08/22/86|
|----|--------|-------|-------------------------------|--------|
| L | 70665 |Fig 5-8| Added Module 19 |09/17/86|
|----|--------|-------|-------------------------------|--------|
| M | 70668 | ALL | Deleted 8435 from manual |09/29/86|
| | | | Change 2.4 | |
| | | | Add to description of Fig.2-1 | |
| | | | Add Figure 2-2 | |
|----|--------|-------|-------------------------------|--------|
| N | 71322 | ALL |Correct Errors, Add Figures |01/26/87|
| | | |2-3 and 2-4, Remove Table 5-2, | |
| | | |Redraw Figure 8-1 | |
|----|--------|-------|-------------------------------|--------|
| P | 71331 | 1.0 |Correct Errors |02/16/87|
| | | 5.4.2 | | |
| | |Figure | | |
| | | 8-1 | | |
|----|--------|-------|-------------------------------|--------|
| R | 71359 | 2.8 |Change 50 G's to 70 NON OP |04/22/87|
| | | |Shock. Add Y and Z directions | |
| | | |at 1.0 G for OP VIB and reduce | |
| | | |OP VIB X Axis to .7 G's. | |
|----|--------|-------|-------------------------------|--------|
| S | 72301 |Fig 2-2|Removed ground strap. |10/29/87|
|----|--------|-------|-------------------------------|--------|
| T | 73200M |Fig 2-1|Add Universal I PCBA. |06/06/88|
| | |Fig 2-2| | |
| | |Fig 2-3|Add Universal II PCBA. | |
| | |Fig 2-4| | |
| | | 1.0, |Change. | |
| | | 2.11 | | |
| | | 5.2.4 |Change 50 to 300. | |
| | | 5.4.1 |Change*. | |
| | |5.4.2.7|Add. | |
| | |Fig 5-8|Add chart for Universal II PCBA| |
| | |Fig 9-1|Change. | |
| | |Fig 9-2|Add. | |
|----|--------|-------|-------------------------------|--------| REVISIONSMANUAL NO.
1010
|----|--------|-------|--------------------------------|--------|
| RV | EC NO. | SECT. |DESCRIPTION | DATE |
|----|--------|-------|--------------------------------|--------|
| U | 73243 | 2.6 |Change 20,000 to 30,000. |08/17/88|
| | | 2.7 |Add Model 8438 Media Defect | |
| | | |Criteria. | |
|----|--------|-------|--------------------------------|--------|
| V | 73762 |Fig 2-1|Redimensioned. |12/29/88|
| | | thru | | |
| | | 2-8 | | |
| | |5.3.1 |Updated write data. | |
| | |5.4.2 |Add J20 Jumper function. | |
| | | 8.6 |Add head parking routine. | |
|----|--------|-------|--------------------------------|--------|
| W | 74094 |5.4.2 |Change to reflect 8438XX26. | |
| | |8.6 |Low Power/Head Park operation. | |
| | |10.1 | | |
| | |Fig 9-3|Add Figure 9-3. | |
|----|--------|-------|--------------------------------|--------|
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|----|--------|-------|--------------------------------|--------| TABLE OF CONTENTS
Section Page
1.0 INTRODUCTION......................................... 1-1
2.0 PRODUCT SPECIFICATIONS MODELS 8212,8412,8425 & 8438.. 2-1
2.1 Model Specifications................................. 2-1
2.2 Performance Specifications........................... 2-2
2.3 Power Requirements................................... 2-2
2.4 Physical Characteristics............................. 2-3
2.5 Environmental Characteristics........................ 2-3
2.6 Reliability and Maintenance.......................... 2-3
2.7 General Characteristics.............................. 2-4
2.8 Shock and Vibration.................................. 2-4
2.9 Magnetic Field....................................... 2-4
2.10 Acoustic Noise....................................... 2-5
3.0 FUNCTIONAL DESCRIPTION............................... 3-1
3.1 Read/Write and Control Electronics................... 3-1
3.2 Drive Mechanism...................................... 3-1
3.3 Air Filtration System................................ 3-1
3.4 Head Positioning Mechanism........................... 3-1
3.5 Read/Write Heads and Disks........................... 3-2
3.6 Mechanically Isolated Mounting Points................ 3-2
3.7 Track Zero Detector.................................. 3-2
4.0 OPERATIONAL DESCRIPTION.............................. 4-1
4.1 Power Sequencing..................................... 4-1
4.2 Drive Selection...................................... 4-1
4.3 Track Accessing...................................... 4-2
4.4 Head Selection....................................... 4-2
4.5 Read Operation....................................... 4-2
4.6 Write Operation...................................... 4-2
5.0 ELECTRICAL INTERFACE................................. 5-1
5.1 Control Input Signals................................ 5-4
5.2 Control Output Signals............................... 5-6
5.3 Data Transfer Signals................................ 5-7
5.4 Customer Options..................................... 5-10
5.5 Terminators.......................................... 5-11
5.6 Error Messages....................................... 5-11
6.0 PHYSICAL INTERFACE................................... 6-1
6.1 P1 Connector-Control Signals......................... 6-1
6.2 P2 Connector-Data Signals............................ 6-2
6.3 P3 Connector-DC Power................................ 6-2
7.0 TRACK FORMATTING GUIDELINES.......................... 7-1
7.1 Gap 1................................................ 7-1
7.2 Sync................................................. 7-1
7.3 Gap 2................................................ 7-1
7.4 Gap 3................................................ 7-1
TABLE OF CONTENTS (CONTINUED)
Section Page
8.0 INSTALLATION......................................... 8-1
8.1 Unpacking and Inspection............................. 8-1
8.2 Repacking............................................ 8-5
8.3 Configuration........................................ 8-5
8.4 Recommended Mounting Configuration................... 8-5
8.5 Cabling.............................................. 8-6
8.6 Head Parking Routine................................. 8-6
9.0 PRINTED CIRCUIT BOARD REPLACEMENT.................... 9-1
10.0 DIAGNOSTIC AND EXERCISE ROUTINES..................... 10-1
10.1 General Description.................................. 10-1
10.2 Message Readout...................................... 10-2
10.3 Message Definitions.................................. 10-2 LIST OF FIGURES
Figure Page
2-1 Outline and Mounting Dimensions (with Faceplate
Universal I PCBA).................................... 2-6
2-2 Outline and Mounting Dimensions (without Faceplate
Universal I PCBA).................................... 2-7
2-3 Outline and Mounting Dimensions (with Faceplate
Universal II PCBA)................................... 2-8
2-4 Outline and Mounting Dimensions (without Faceplate
Universal II PCBA)................................... 2-9
2-5 Outline and Mounting Dimensions (Extender Brackets
without Faceplate Universal I PCBA).................. 2-10
2-6 Outline and Mounting Dimensions (Extender Brackets
with Faceplate Universal I PCBA)..................... 2-11
2-7 Outline and Mounting Dimensions (Extender Brackets
without Faceplate Universal II PCBA)................. 2-12
2-8 Outline and Mounting Dimensions (Extender Brackets
with Faceplate Universal II PCBA).................... 2-13
4-1 Power-On Timing...................................... 4-1
5-1 Cable Interconnection - 4 Drive System............... 5-3
5-2 Control Signal Driver/Receiver....................... 5-4
5-3 Seek Mode Timing..................................... 5-6
5-4 Data Signal Driver/Receiver.......................... 5-8
5-5 Read/Write Timing (MFM).............................. 5-9
5-6 Read/Write Timing (2/7).............................. 5-9
5-7 Drive Select Jumper.................................. 5-10
6-1 P1/P2 Connector...................................... 6-1
6-2 P3 Connector......................................... 6-2
8-1 Single Pack Shipping Container....................... 8-2
8-2 Multipack Shipping Container......................... 8-4
9-1 Universal I Printed Circuit Board Replacement........ 9-2
9-2 Universal II Printed Circuit Board Replacement....... 9-3
9-3 8438XX26 Printed Circuit Board Replacement........... 9-4
LIST OF TABLES
5-1 P1/P2/P3 Connector Pin Assignment.................... 5-2 1.0INTRODUCTION
The MiniScribe 8212, 8412, 8425 and 8438 are half-height
random access 95 mm rigid media disk drives employing
Winchester technology. The drives utilize a rack-and-pinion
actuator, microprocessor control, and open loop stepper head
positioning.
The drives feature power up diagnostics and buffered seek.
Models 8212, 8412, and 8425 have a data transfer rate of 5
Megabit/Sec, while the 8438 features a 7.5 Megabit/Sec data
transfer rate. D.C. voltages and physical form factor are the
same as the 3-1/2 inch half height floppy disk drive.
This equipment generates and uses radio frequency energy, and
if not installed and used properly, that is in strict accor-
dance with the manufacturer's instructions, may cause inter-
ference to radio and television reception. This product has
been type tested in a representative system, and found to
comply with the limits for a Class B computing device in
accordance with specifications in Subpart 2 of Part 15 of FCC
rules which are designed to provide reasonable protection
against such interference in a residential installation. This
does not imply that this product guarantees FCC compliance in
any given system. It is the responsibility of the installing
systems manufacturer to insure system assembly EMC compliance.
MiniScribe maintains product compliance regarding FCC require-
ments and will provide technical assistance in securing system
product compliance where appropriate.
If the system equipment does cause interference to radio or
television reception (this can be determined by turning the
equipment off and on), the user is encouraged to try to
correct the interference by using one or more of the following
measures:
- Reorient the receiving antenna
- Relocate the computer with respect to the receiver
- Move the computer away from the receiver
It is recommended that shielded interface cable be used to
ensure compliance with FCC emission limits. 2.0PRODUCT SPECIFICATIONS - MODELS 8212, 8412, 8425 & 8438
2.1 MODEL SPECIFICATIONS
MODEL 8212
Storage Capacity:
Unformatted
Per Drive 12,811,680 Bytes
Per Surface 6,405,840 Bytes
Per Track 10,416 Bytes
Per Cylinder 20,832 Bytes
Disks 1
Recording Heads 2
Cylinders 615
Data Tracks 1230
MODEL 8412
Storage Capacity:
Unformatted
Per Drive 12,832,512 Bytes
Per Surface 3,208,128 Bytes
Per Track 10,416 Bytes
Per Cylinder 41,664 Bytes
Disks 2
Recording Heads 4
Cylinders 308
Data Tracks 1232
MODEL 8425
Storage Capacity:
Unformatted
Per Drive 25,623,360 Bytes
Per Surface 6,405,840 Bytes
Per Track 10,416 Bytes
Per Cylinder 41,664 Bytes
Disks 2
Recording Heads 4
Cylinders 615
Data Tracks 2460
MODEL 8438
Storage Capacity:
Unformatted
Per Drive 38,435,040 Bytes
Per Surface 9,608,760 Bytes
Per Track 15,624 Bytes
Per Cylinder 62,496 Bytes
Disks 2
Recording Heads 4
Cylinders 615
Data Tracks 2460
Recording Density:
Model 8212/8425 Model 8412 Model 8438
Areal 11 Mbits/sq.in. 8 Mbits/sq.in. 16 Mbits/sq.in
(TPI x BPI)
Linear 13,412 BPI 9685 BPI 19,900 BPI
(MFM)
Radial 804 TPI 804 TPI 804 TPI
2.2 PERFORMANCE SPECIFICATIONS
Rotational Rate 3600 RPM +0.5%
Data Transfer Rate 8425,8412,8212 5.0 Mbits/second
Data Transfer Rate 8438 7.5 Mbits/second
Access Time
Average Latency 8.33 ms
Seek Time (including settling time) MODEL MODEL
8212,8425, 8412
8438
Single Track (average)* 15 ms 15 ms
Average 68 ms 50 ms
Maximum 152 ms 120 ms
* Worst Case Single Track Seek 15.4 ms 15.4 ms
2.3 POWER REQUIREMENTS
DC Input +12 Volts DC
Steady State: + 5%, 0.70 amps typical, 0.85
amps maximum.
Maximum Ripple allowed is 1% with equivalent
resistive load.
Start Surge: 2 amps maximum during initial 5
seconds, 1.5 amps typical during initial 12
seconds. +5 Volts DC
+ 5%, 0.55 amps typical, 0.65 amps maximum.
Maximum Ripple allowed is 2% with equivalent
resistive load.
AC Input None Required
Power Dissipation
10 Watts Average
11.2 Watts Even Tracks Typical
8.8 Watts Odd Tracks Typical
13.0 Watts Max.
2.4 PHYSICAL CHARACTERISTICS
Outline Dimensions See Figures 2-1 thru 2-8
Mounting Dimensions See Figures 2-1 thru 2-8
Weight 1.8 pounds
2.5 ENVIRONMENTAL CHARACTERISTICS
Temperature:
Operative 40øF (4øC) to 122øF (50øC)
Non-operative -40øF (-40øC) to 140øF (60øC)
Operative Thermal Gradient 18øF/hr (10øC/hr) maximum
Non-Operative
Thermal Gradient 36øF/hr (20øC/hr) maximum
Humidity:
Non-Operative 5% to 95% Non-Condensing
Operative 8% to 80% non-condensing
Maximum Wet Bulb 78øF (26øC)
(Operative and Non-Operative)
Altitude (relative to sea level):
Operative -200 to 10,000 feet
Non-operative (maximum) 40,000 feet
2.6 RELIABILITY AND MAINTENANCE
MTBF 30,000 hours (continuous
operation) at 35øC
MTTR 30 minutes
Preventative Maintenance None
Component Design Life 5 years
Data Reliability 1 recoverable error in 1010 bits
read
1 permanent error in 1012 bits
read (not recoverable in 16
reads)
1 seek error in 5 x 106 seeks
Media Defect Criteria (as shipped from MiniScribe)
MODEL 8212 & 8412 MODEL 8425
6 defects/surface maximum 6 defects/surface maximum
10 defects maximum 20 defects maximum
Cylinder Zero Defect Free Cylinders Zero and One Defect
Free
MODEL 8438
8 defects/surface maximum
30 defects maximum
Cylinder Zero and One
Defect Free
2.7 GENERAL CHARACTERISTICS
Start Time (maximum) 15 seconds from power applica-
tion to -READY
Stop Time Typical 15 seconds from power removal
2.8 SHOCK AND VIBRATION
Non-operational Shock 70 G's, 10 ms pulse duration
1/2 sine wave (10 hits)
Non-operational Vibration 5 to 11 Hz - .65 in. DA
(peak to peak)
11 to 500 Hz - 4.0 G's
Operational Shock 10 G's, 10 ms pulse duration
1/2 sine wave (10 hits)
Operational Vibration 5 to 10 Hz - .20 in. DA
(peak to peak)
10 to 500 Hz - 1.0 G
Y and Z Directions
- 0.7 G
X Direction
2.9 MAGNETIC FIELD
The externally induced magnetic flux density may not exceed
3 Gauss as measured at the disk surface. 2.10ACOUSTIC NOISE
0 - 5000 Hz 45 dBA maximum at 1 meter
(on track mode)
Figure 2-1
OUTLINE AND MOUNTING DIMENSIONS
(WITH FACEPLATE UNIVERSAL I PCBA)
Figure 2-2
OUTLINE AND MOUNTING DIMENSIONS
(WITHOUT FACEPLATE UNIVERSAL I PCBA)
Figure 2-3
OUTLINE AND MOUNTING DIMENSIONS
(WITH FACEPLATE UNIVERSAL II PCBA)
Figure 2-4
OUTLINE AND MOUNTING DIMENSIONS
(WITHOUT FACEPLATE UNIVERSAL II PCBA)
Figure 2-5
OUTLINE AND MOUNTING DIMENSIONS
(EXTENDER BRACKETS - WITHOUT FACEPLATE UNIVERSAL I PCBA)
Figure 2-6
OUTLINE AND MOUNTING DIMENSIONS
(EXTENDER BRACKETS WITH FACEPLATE UNIVERSAL I PCBA)
Figure 2-7
OUTLINE AND MOUNTING DIMENSIONS
(EXTENDER BRACKETS - WITHOUT FACEPLATE UNIVERSAL II PCBA)
Figure 2-8
OUTLINE AND MOUNTING DIMENSIONS
(EXTENDER BRACKETS WITH FACEPLATE UNIVERSAL II PCBA) 3.0FUNCTIONAL DESCRIPTION
The MiniScribe Models 8212, 8412, 8425 and 8438 contain all
necessary mechanical and electronic parts to interpret control
signals, position the recording heads over the desired track,
read and write data, and provide a contaminant free environ-
ment for the heads and disks.
3.1 READ/WRITE AND CONTROL ELECTRONICS
One integrated circuit is mounted within the sealed enclosure
in proximity to the read/write heads. Its function is to
provide head selection, read preamplification, and write drive
circuitry.
The single microprocessor controlled circuit card provides the
remaining electronic functions which include:
Read/Write Circuitry
Head Positioning
Stepper Motor Drive
Interface Control
Index Detection
Track Zero Detect
Spin Speed Control
Dynamic Braking
3.2 DRIVE MECHANISM
A brushless DC direct drive motor rotates the spindle a 3600
rpm. The motor/spindle assembly is dynamically balanced to
provide minimal mechanical runout to the disks. A dynamic
brake is used to provide a fast stop to the spindle motor when
power is removed.
3.3 AIR FILTRATION SYSTEM
Within the sealed enclosure, a 0.3 micron filter coupled with
a breather filter, provides over the drive life, a clean,
above atmospheric pressure environment for the heads and
disks.
3.4 HEAD POSITIONING MECHANISM
Two (2) read/write heads on the Model 8212 and four (4)
read/write heads on the Models 8412, 8425 and 8438 are
supported by a carriage mechanism coupled to the stepper motor
through a rack-and-pinion motion translator. 3.5READ/WRITE HEADS AND DISKS
Data is recorded on two (2) 95 mm diameter disks through four
(4) Mini-Winchester type ferrite heads on the Models 8412,
8425 and 8438, and on one (1) 95 mm diameter disk through two
(2) Mini-Winchester type ferrite heads on the Model 8212.
3.6 MECHANICALLY ISOLATED MOUNTING POINTS
Four (4) side mounting and four (4) base mounting points are
provided to the customer. Each mounting point is mechanical-
ly isolated from the head-disk assembly.
3.7 TRACK ZERO DETECTOR
The Track Zero Detector resides on the stepper motor. This
optical sensor consists of a light source (activated only when
a seek is initiated) and a receiver which when blocked by an
interrupter on the motor shaft, indicates one of several
logical Track Zero positions. The microprocessor determines
the physical location of Track Zero from the redundant logical
Track Zeros.
4.0 OPERATIONAL DESCRIPTION
4.1 POWER SEQUENCING
+5 volts DC and +12 volts DC may be applied in any order.
+12 VDC powers the spindle drive motor. The microprocessor
verifies that the disks are spinning at 3600 rpm and then
activates the automatic Track Zero positioning. -TRACK ZERO,
-SEEK COMPLETE, and -READY will become true upon completion
of the Track Zero positioning sequence. Refer to Figure 4-1
for the Power-Up Sequencing.
Figure 4-1
POWER-ON TIMING
4.2 DRIVE SELECTION
Drive selection occurs when one of the -DRIVE SELECT signals
is true. Only the drive selected will respond to Control
Input Signals and only that drive's Control Output Signals
will be gated to the interface. 4.3TRACK ACCESSING
Read/write head positioning is accomplished by:
o Setting -WRITE GATE false
o Setting the appropriate -DRIVE SELECT true
o Selected drive having -READY and -SEEK COMPLETE true
o Setting the appropriate state of -DIRECTION IN
o Pulsing the -STEP
Each -STEP pulse will cause the read/write heads to move
either one track in or one track out, depending on the state
of -DIRECTION IN. -DIRECTION IN true will cause the read/
write heads to move inward toward the spindle; -DIRECTION IN
false will cause the read/write heads to move outward toward
Track Zero. The drive will prevent any outward movement
beyond Track Zero regardless of the -STEP pulses.
A seek to cylinder 663 will position the read/write heads over
the shipping zone.
A seek to a higher cylinder than 664 will cause a recalibra-
tion sequence in the drive, which will position the read/write
heads at Track Zero.
4.4 HEAD SELECTION
The Model 8212 utilizes two read/write heads (Heads 0 and 1)
and the Models 8412, 8425 and 8438 utilize four read/write
heads (Heads 0, 1, 2 and 3). The appropriate head is selected
by placing the head's binary address on the -Head Select input
lines. (Refer to Table 5-1 for pin designations.)
4.5 READ OPERATION
Reading data from the drive is accomplished by:
o Setting -WRITE GATE false
o Setting the appropriate -DRIVE SELECT true
o Selected drive having -READY and -SEEK COMPLETE true
o Selecting the appropriate -HEAD SELECT binary address
4.6 WRITE OPERATION
Writing data to the drive is accomplished by:
o Setting the appropriate -DRIVE SELECT true
o Selected drive having -READY and -SEEK COMPLETE true
o Selecting the appropriate -HEAD SELECT binary address
o Assuring -WRITE FAULT is false
o Setting -WRITE GATE true and placing the data to be
written on the MFM WRITE DATA lines. 5.0ELECTRICAL INTERFACE
The interface to the MiniScribe 8212, 8412, 8425 and 8438 can
be divided into three categories, each of which is physically
separated: Control Signals, Data Signals and DC Power.
All Control Signals are digital in nature (open collector
TTL), and provide signals either to the drive (input) or
signals to the controller (output). The Data Signals are
differential in nature and provide data either to (write) or
from (read) the drive.
Table 5-1 provides the connector pin assignments for P1 and
P2. The interconnect cable between the drive and controller
may be flat ribbon or twisted pairs of a length not to exceed
20 feet. The signal return lines and ground lines for P1 and
P2 should be grounded at the controller.
Table 5-1 also provides the connector pin assignments or P3.
The voltage return lines of P3 should only be grounded at the
power supply.
The cable interconnection for a 4 drive system is defined in
Figure 5-1. Table 5-1
P1/P2/P3 CONNECTOR PIN ASSIGNMENT
Ground
Signal Return Signal Name
P1-2 P1-1 Reserved
P1-4 P1-3 Reserved
P1-6 P1-5 -Write Gate
P1-8 P1-7 -Seek Complete
P1-10 P1-9 -Track Zero
P1-12 P1-11 -Write Fault
P1-14 P1-13 -Head Select 20
P1-16 P1-15 Reserved To P2-7
P1-18 P1-17 -Head Select 21
P1-20 P1-19 -Index
P1-22 P1-21 -Ready
P1-24 P1-23 -Step
P1-26 P1-25 -Drive Select 1
P1-28 P1-27 -Drive Select 2
P1-30 P1-29 -Drive Select 3
P1-32 P1-31 -Drive Select 4
P1-34 P1-33 -Direction In
P2-1 P2-2 -Selected
P2-3 P2-4 Reserved
P2-5 P2-6 Spare
P2-7 P2-8 Reserved To P1-16
P2-9 Spare
P2-10 Spare
P2-11 P2-12 Ground
P2-13 +MFM Write Data
P2-14 -MFM Write Data
P2-15 P2-16 Ground
P2-17 +MFM Read Data
P2-18 -MFM Read Data
P2-19 P2-20 Ground
P3-1 +12 Volts DC
P3-2 +12 Volts DC Return
P3-3 +5 Volts DC Return
P3-4 +5 Volts DC
Figure 5-1
CABLE INTERCONNECTION - 4 DRIVE SYSTEM 5.1CONTROL INPUT SIGNALS
The Control Input Signals are gated into the drive by the
activation of the appropriate -DRIVE SELECT line. Refer to
Figure 5-2 for the driver/receiver circuit and signal level
specification. Each Control Input Signal is terminated by a
220/330 ohm resistor network in the drive.
5.1.1 -WRITE GATE
The true state of this signal enables write data to
be written on the disk. The false state of this
signal enables data to be transferred from the drive.
5.1.2 -HEAD SELECT 20 AND 21
The -Head Select signal provides for the selection of
each individual read/write head in a binary coded
sequence. -Head Select 20 is the least significant
signal. Heads are numbered 0 and 1 for the Model
8212 and 0 through 3 for the Models 8412, 8425 and
8438. When -Head Select 20 is false, Head 0 will be
selected on the Model 8212; when both Head Select
lines are false, Head 0 will be selected on the Models
8412, 8425 and 8438.
Figure 5-2
CONTROL SIGNAL DRIVER/RECEIVER 5.1.3-DIRECTION IN
This signal defines the direction of motion of the
read/write heads when the -STEP line is pulsed. A
high level defines the direction as "out", and if a
pulse is applied to the -STEP line, the read/write
heads will move away from the center of the disk. If
this line is a low level, the direction of motion is
defined as "in", and the step pulses will cause the
read/write heads to move toward the center of the
disk. Change in direction must meet the requirements
shown in Figure 5-3.
5.1.4 -STEP
This control signal causes the read/write heads to
move with the direction defined by the -DIRECTION IN
line.
The drive is able to accept step pulses in two modes,
track-to-track and buffered. In the track-to-track
mode, step pulses should be sent at a 3 ms rate or
greater to access the desired track. In the buffered
mode, step pulses must be sent at a 2 us to 150 us
rate. In this mode, pulses are accumulated until no
new pulses have been received for 210 us. At this
point, access motion is initiated and an optimized
seek algorithm is executed to minimize access time.
Pulses that occur after this time and prior to
completion of the seek will be ignored. The drive
automatically decides which mode to use based on the
incoming step pulse rate. The direction line should
be maintained at the desired level 100 ns before the
first step pulse and until 100 ns after the last step
pulse has been issued. Refer to Figure 5-3 for the
timing diagram.
5.1.5 -DRIVE SELECT 1, 2, 3 AND 4
-DRIVE SELECT, when low, connects the drive to the
control lines and allows step or read/write oper-
ations. Additionally, when -DRIVE SELECT is active,
the drive responds by turning on the activity LED.
(Refer to Paragraph 5.4.1 for address information.)
Figure 5-3
SEEK MODE TIMING
5.2 CONTROL OUTPUT SIGNALS
The Control Output Signals are gated from the drive by the
activation of the appropriate -DRIVE SELECT line. Refer to
Figure 5-2 for the driver/receiver circuit and signal level
specifications. Each Control Output Signal should be
terminated in the controller with a 220/330 ohm resistor
network.
5.2.1 -SEEK COMPLETE
This signal will go true when the read/write heads
have settled on the final track at the end of a seek.
Reading or writing should not be attempted when -SEEK
COMPLETE is false.
-SEEK COMPLETE will go false if a recalibration
sequence is initiated (by drive logic) at power on,
or 500 ns (typical) after the leading edge of a step
pulse.
5.2.2 -TRACK ZERO
This interface signal indicates a true state only when
the drive's read/write heads are positioned at Track
Zero (the outermost data track). 5.2.3-WRITE FAULT
This signal is used to indicate that a condition
exists in the drive which will result in improper
writing on the disk. When this signal is true,
further writing is inhibited at the drive until the
condition is corrected. Once corrected, the con-
troller can reset this line by deselecting the drive.
Any of the following four conditions could cause
-WRITE FAULT to be true:
1. No write current sensed in the head with -WRITE
GATE active and -DRIVE SELECTED.
2. An open head in the drive.
3. No transitions on MFM WRITE DATA line when -WRITE
GATE is true.
4. DC voltages are out of tolerance.
5.2.4 -INDEX
This 300 microsecond (typical) interface pulse is
provided by the drive once each revolution (16.67 ms
nominal) to indicate the beginning of the track.
Normally, this signal is a high level and makes the
transition to the low level to indicate -INDEX. Only
the transition from high to low is valid.
5.2.5 -READY
This interface signal, when true together with -SEEK
COMPLETE, indicates that the drive is ready to read,
write, or seek, and that the I/O signals are valid.
When this signal is false, all writing and seeking are
inhibited.
The maximum time required for -READY to be true after
power-on is 15 seconds.
5.2.6 -DRIVE SELECTED
The -DRIVE SELECTED signal will go true only when the
drive is programmed as drive X (X=1,2,3, or 4) and
the -DRIVE SELECT X line is activated by the con-
troller.
5.3 DATA TRANSFER SIGNALS
All signals associated with the transfer of data between the
drive and the controller are differential. Two pairs of balanced signals are used for the transfer of
data: MFM WRITE DATA and MFM READ DATA. Figure 5-4 il-
lustrates the driver/receiver equivalent combination used in
the MiniScribe 8212, 8412, 8425 and 8438 for data transfer
signals.
Figure 5-4
DATA SIGNAL DRIVER/RECEIVER
5.3.1 WRITE DATA
This is a differential pair that defines the transi-
tions to be written on the track. The transition of
the + WRITE DATE line going more positive than the -
WRITE DATA line will cause a flux reversal on the
track provided -WRITE GATE is active. The timing of
the write operation is illustrated in Figure 5-5.
5.3.2 READ DATA
The data recovered by reading a pre-recorded track is
transmitted to the controller via the differential
pair of READ DATA lines. The transition of the +
READ DATA line going positive than the - READ DATA
line represents a flux on the track of the selected
head. The timing of operation is illustrated in
Figures 5-5 and 5-6.
Figure 5-5
READ/WRITE TIMING (MFM)
Figure 5-6
READ/WRITE TIMING (2/7) 5.4CUSTOMER OPTIONS
Customer options are limited to the drive select address and
burn-in mode on drives shipped to mid-1986. On newer drives
there are additional options which may be selected. On all
drives normal operation is achieved with no jumper or trace
modifications.
5.4.1 -DRIVE SELECT
As shipped, the drive is preselected for drive select
address 1. To change to another address, the two
position jumper located in row 1 of the SEL 1 header
must be repositioned to one of the other three rows
corresponding to the desired drive select number (see
Figure 5-7). Row 1, corresponding with Drive Select
1, is the topmost row when the interconnected column
of pins is on the right.) (Refer to Figure 2-1 or 9-1
for the jumper location.)
Figure 5-7
DRIVE SELECT JUMPER 5.4.2UNIVERSAL PCBA JUMPER FUNCTIONS
Refer to Figures 2-1 thru 2-8 or 9-1 and 9-2 for
jumper locations.
5.4.2.1 J13B (J15 on 8438XX26XX) - low power option
1. When open, current from stepper motor
is removed after no activity for 30 seconds.
5.4.2.2 J13C - low power option 2. When open, seek
to ship zone is performed before stepper
power is removed. Note that J13B has to be
open also.*
5.4.2.3 J15 - when open, delays seek complete by
3 milliseconds.*
5.4.2.4 J17 - when closed, allows data cable to be
daisy-chained.*
5.4.2.5 J18 - normally 1 and 2 are jumpered. If
2 and 3 are jumpered, this connects the LED
to drive select.*
5.4.2.6 J19 - when closed, asserts -UNSAFE through
+MOTOR ON.*
5.4.2.7 J20 - when closed, asserts -UNSAFE if
ribbon cable connectors J1 or J2 are
accidentally inverted.*
5.4.2.8 J21 - Normally 2 and 3 are jumpered. If 1
and 2 are jumpered, a voltage fault will
occur at a higher voltage.*
* N/A for 8438XX26XX
5.5 TERMINATORS
Each drive is shipped with a terminator pack providing the
220/330 ohm termination for the Control Input Signals. If
multiple drives are configured in a daisy chain configuration,
(see Figure 5-1), the terminator pack must be removed from
all drives except the last unit on the daisy chain. Figure
2-1 shows the location of the terminator pack.
5.6 ERROR MESSAGES
The microprocessor performs wake up diagnostics on power up.
Additionally, some operations are monitored during normal
operations. If an error is detected, the microprocessor will
flash a warning by blinking the Activity LED. An explanation
of the diagnostics and error codes is given in Chapter 10. 6.0PHYSICAL INTERFACE
The electrical interface among the disk drive, the host
controller and the DC power supply is via three connectors:
P1 - Control Signals, P2 - Read/Write Signals, and P3 - DC
Power input.
Refer to Figure 2-1 for connector locations.
6.1 P1 CONNECTOR - CONTROL SIGNALS
Connection to P1 is through a 34 pin PCB edge connector. The
dimensions for this connector are shown in Figure 6-1. The
pins are numbered 1 through 34 with the odd pins located on
the circuit side of the Printed Circuit Board. A key slot is
provided between pins 4 and 6.
The recommended mating connector (J1) is AMP Ribbon Connector,
P/N 88373-3.
Figure 6-1
P1/P2 CONNECTOR 6.2P2 CONNECTOR - DATA SIGNALS
Connection to P2 is through a 20 pin edge connector. The
dimensions for the connector are shown in Figure 6-1. The
pins are numbered 1 through 20 with the odd pins located on
the circuit side of the Printed Circuit Board. A key slot is
provided between pins 4 and 6.
The recommended mating connector (J2) is AMP Ribbon Connector,
P/N 88373-6.
6.3 P3 CONNECTOR - DC POWER
DC power connector (P3) is a 4 pin AMP Mate-N-Lok connector,
mounted on the PCB. P3 pins are numbered as shown in Figure
6-2.
The recommended mating connector (J3) is AMP P/N 1-480424-0
utilizing AMP pins P/N 350078-4.
Figure 6-2
P3 CONNECTOR
7.0 TRACK FORMATTING GUIDELINES (excluding 8438)
The purpose of a format is to organize a track into smaller
addressable records called sectors. The MiniScribe 8212, 8412
and 8425 are soft sectored devices allowing the customer to
define the sector format. When establishing the track format
certain rules should be observed to accommodate the physical
timing relationships within the drive.
7.1 GAP 1
Should head switching occur at index time, Gap 1 must be
provided to allow the read amplifier to stabilize and to
ensure reliable reading of the first sector's contents. The
minimum length of Gap 1 is 12 bytes.
7.2 SYNC
A sync field precedes each addressable record (ID or record)
and should be of a length to accommodate the "lock up"
characteristics of the phase-lock-loop within the data
separator portion of the customer's controller.
7.3 GAP 2
It is recommended that a gap be placed after each sector in
order to accommodate spindle speed variations between write
operations on the same track and to ensure that overwrite will
not occur on adjacent recorded data. To accommodate the +
0.5% speed tolerance of the disk drive, Gap 2 should be a
minimum of 1 byte for each 64 bytes of data within the sector.
Additionally, the customer should increase the gap to
accommodate the frequency variation of the controller
generated MFM WRITE DATA signals which is asynchronous to the
spin speed.
7.4 GAP 3
This gap is a speed tolerance buffer for the entire track used
to ensure that the last sector does not overflow beyond the
index. Gap 3 precedes index and should be of a length to
accommodate the spin speed variations of the disk drive (+
0.5%) and the frequency variations of the controller generated
MFM WRITE DATA signals.
8.0 INSTALLATION
CAUTION/WARNING
THE MINISCRIBE DRIVE IS A PRECISION PRODUCT
WEIGHING 1.8 POUNDS. DURING HANDLING THE UNIT
MUST NOT BE DROPPED, JARRED OR BUMPED. OTHER-
WISE, DAMAGE TO THE HEADS AND DISKS MAY OCCUR.
WHEN THE DRIVE IS REMOVED FROM THE MINISCRIBE
SHIPPING CONTAINER AND NOT IMMEDIATELY
SECURED WITHIN A CHASSIS THROUGH ITS SHOCK
MOUNTS, IT MUST BE STORED ON A SOFT PADDED
SURFACE.
FAILURE TO COMPLY WITH THE ABOVE PROCEDURE WILL
RENDER NULL AND VOID ALL WARRANTIES.
8.1 UNPACKING AND INSPECTION
8.1.1 SINGLE PACK
Retain the packing materials for reuse. Refer to
Figure 8-1 for the following steps:
Step 1: Inspect the shipping container for evidence
of damage in transit. If damage is evident,
notify the carrier immediately.
Step 2: Open the outer carton by carefully cutting
the tape on the top of the carton.
Step 3: Lift the inner carton out of the outer
carton and remove the end foam cushions.
Step 4: Open the inner carton by carefully cutting
tape on the top of the carton.
Step 5: Lift the drive from the inner carton and
remove the end foam cushions and the
cardboard wrap with spacer.
Step 6: Place the two pairs of end cushions, the
cardboard wrap with spacer, and the inner
carton within the outer carton and store for
subsequent use.
Step 7: Inspect the drive for shipping damage, loose
screws or components and correct if
possible. If damage is evident without
noticeable damage to the shipping cartons,
notify MiniScribe immediately for drive
disposition.
Figure 8-1
SINGLE PACK SHIPPING CONTAINER 8.1.2MULTIPACK
Retain the packing materials for reuse. Refer to
Figure 8-2 for the following steps:
Step 1: Inspect the shipping container for evidence
of damage in transit. If damage is evident,
notify the carrier immediately.
Step 2: Lift off outer carton top.
Step 3: Lift off upper foam cushion. This will
expose the drives in their wrapping
material.
Step 4: Lift each drive out of the lower foam
cushion individually and remove any wrapping
material.
Step 5: Return any wrapping material to lower foam
cushion for reuse.
Step 6: Place the drive on a protective foam pad and
inspect the drive for shipping damage, loose
screws or components and correct if
possible. If damage is evident without
noticeable damage to the shipping carton,
notify MiniScribe immediately for drive
disposition.
Step 7: Once all of the drives have been removed
from shipping carton and the cardboard wraps
have been returned to the lower foam
cushion, reassemble the carton and store for
reuse.
Figure 8-2
MULTIPACK SHIPPING CONTAINER 8.2REPACKING
Should the MiniScribe drive require shipment, repack the drive
using the MiniScribe packing materials and follow the steps
in Paragraph 8.1.1 or Paragraph 8.1.2 in reverse order.
NOTICE
The MiniScribe drive product warranty
is void if the drive is returned to
MiniScribe in other than the standard
MiniScribe shipping carton packed in
accordance with the enclosed procedure.
It should also be noted that the Mini-
Scribe drive product warranty is void
if the multipack shipping container is
not shipped on a pallet.
MiniScribe drives are shipped from the
factory with the heads parked in the
shipping zone at cylinder 663. Before
physically moving the drive, following
any customer usage, the Read/Write heads
must be parked in the shipping zone to
prevent damage to the heads and media.
Refer to Section 8.6 for the head parking
routine.
8.3 CONFIGURATION
The customer should determine the drive select number required
and configure the drive address as defined in Paragraph 5.4.
8.4 RECOMMENDED MOUNTING CONFIGURATION
The MiniScribe 8212, 8412, 8425 and 8438 quarter size drives
are designed to be used in applications where the unit may
experience shock and vibration at greater levels than larger
and heavier disk drives.
Two features which allow greater shock tolerance are the
rugged media and shock mounts. To take full advantage of the
shock mounts, however, it is necessary to provide a minimum
of 0.1 inch clearance on both the top and sides of the drive.
This clearance allows for movement of the drive during
acceleration. The drive may be mounted in any attitude.
The drive is mounted using 6-32 screws, 1/8 inch maximum
penetration. See Figure 2-1 for mounting dimensions. The
customer should allow adequate ventilation for the drive to
ensure reliable drive operation over the operating temperature
range. 8.5CABLING
Connect interface cables with connectors P1, P2 and P3 to J1,
J2 and J3 respectively. Ensure that connectors P1 and P2 have
keys installed as indicated in Figure 6-1. If multiple drives
are to be interconnected, remove the terminator packs in all
but the last drive of the daisy chain. See Figure 2-1 for the
terminator pack location.
8.6 HEAD PARKING ROUTINE
If a system level software routine is not available for
parking the heads, the following steps should be performed on
the drive. The drive should be oriented with the PCBA up and
the user facing the stepper motor:
STEP 1: Before power is applied to the drive, remove the shunt
from the Drive Select location and install it at
jumper location J13-A (J13 on 8438XX26XX).
STEP 2: Apply power and observe the stepper motor shaft. The
interrupter flag will be directed into the Track Zero
optic sensor (9:00 position).
STEP 3: The interrupter will then rotate rapidly to a position
opposite the optic sensor (2:00 position) for
approximately 4 seconds before entering a random seek
burn-in mode.
STEP 4: During the 4 second delay in Step 3, power should be
removed from the drive.
STEP 5: Remove the shunt from jumper location J13-A, (or J13)
and reinstall it in the original Drive Select
location.
The heads are now parked in the shipping zone (cylinder 663)
and the drive is ready for subsequent handling. 9.0PRINTED CIRCUIT BOARD REPLACEMENT (See Figure 9-1)
CAUTION
THE MINISCRIBE DRIVE IS A PRECISION PRODUCT
WEIGHING 1.8 POUNDS. DURING HANDLING THE UNIT
MUST NOT BE DROPPED, JARRED OR BUMPED.
OTHERWISE, DAMAGE TO THE HEADS AND DISKS MAY
OCCUR. WHEN THE DRIVE IS REMOVED FROM THE
MINISCRIBE SHIPPING CONTAINER AND NOT IM-
MEDIATELY SECURED WITHIN A CHASSIS THROUGH
ITS SHOCK MOUNTS, IT MUST BE STORED ON A
SOFT PADDED ANTI-STATIC SURFACE.
FAILURE TO COMPLY WITH THE ABOVE PROCEDURE
WILL RENDER NULL AND VOID ALL WARRANTIES.
WHEN REMOVING THE PCBA, A GROUNDING WRIST
STRAP MUST BE WORN TO PREVENT ESD DAMAGE.
Step 1: Disconnect the cables and remove the mounting screws.
Move the disk drive to a convenient work station, and
place on a foam pad with the Printed Circuit Board up.
Step 2: Remove the decorator cover.
Step 3: Carefully remove the flexlead connector. Do not pull
on the flexlead; instead grasp the connector on the
sides and slide it off the pins.
Step 4: Remove the four screws holding the board to the base-
plate.
Step 5: Disconnect all remaining connectors (refer to Figure
9-1).
Step 6: Slide the board out of the baseplate by grasping the
edge connectors on the board and gently pulling the
board away from the flexlead.
Step 7: Install the new board by reversing the above steps.
Ensure the connectors are properly mated and the
cables are not touching the spin motor.
Step 8: Configure the drive address and terminator pack to
the same as the old board (refer to Figure 2-1).
Remount and cable the drive in the system.
Figure 9-1
PRINTED CIRCUIT BOARD REPLACEMENT
Figure 9-2
PRINTED CIRCUIT BOARD REPLACEMENT
Figure 9-3
8438XX26XX PRINTED CIRCUIT BOARD REPLACEMENT 10.0DIAGNOSTIC AND EXERCISE ROUTINES
This section covers the diagnostic and exercise routines for
the MiniScribe 8212, 8412, 8425 and 8438. Error indications
and error message definitions are also included.
10.1 GENERAL DESCRIPTION
The microprocessor performs "wake up" diagnostics upon
application of power. If an error is detected, the processor
will flash a warning by blinking the Activity LED. Some
errors are fatal in that they do not return to the program
until power is cycled.
If no errors are detected, the processor tests jumper J13 to
determine its state (open or closed). Briefly, jumper J13
(Drive Exercise Options) is as follows:
The jumper is left open for normal (online) operations. It
is also used to run burn-in code. If the jumper is closed,
(and left closed) the normal burn-in (sequential seeks)
program will be run. If the jumper is closed and opened
during the code level display, the sensor adjust routine is
run.
Power-up sequence of events is as follows:
1. Apply power.
2. The microprocessor runs power on diagnostics and then
allows motor spin up.
3. Test jumper J13. If open, go to normal operation. If
closed, continue to Step 4.
4. Display code level (5 bits), e.g. 00001.
5. Test jumper J13 level. If still closed, continue in
sequential seek exerciser mode. If open, run Track Zero
sensor adjust.
6. Recalibrate access, then seek to maximum cylinder.
7. The LED will display seven zero's (flash code). At this
time the heads are located over the shipping zone. If
power is removed, the heads will land in the shipping
zone.
8. If the test is continued the drive will perform a seek
to cylinder four, (test for seek error) and then seek to
cylinder zero.
9. At this point the sequential seek burn-in will begin.
10.2MESSAGE READOUT
Error codes may be generated by the microprocessor to indicate
hardware failures or warnings that are detected during
power-on diagnostics, burn-in mode, or normal operation.
Error codes are displayed in a "morse-code" type manner. Bits
may be interpreted and converted into hexadecimal error codes.
"Zeros" are indicated by a short (1/2 second) flashing mode.
"Ones" are indicated by a short (1/2 second) continuous ON
mode. Error "Words" are separated by a one second LED off
time.
Zero = 0.5 second flashing mode
One = 0.5 second continuous ON mode
Between Bits = 0.3 second Off
Between Repeat Cycles = 1.0 second Off
Listed below are the binary to hexadecimal conversion values:
0=0000 4=0100 8=1000 C=1100
1=0001 5=0101 9=1001 D=1101
2=0010 6=0110 A=1010 E=1110
3=0011 7=0111 B=1011 F=1111
Example: Code "E"
0.5 Sec ON
0.3 Sec OFF
0.5 Sec ON
0.3 Sec OFF
0.5 Sec ON
0.3 Sec OFF
0.5 Sec FLASHING
1.0 Sec OFF
10.3 MESSAGE DEFINITIONS
Code 0 - Microprocessor RAM error
Code 1 - Microprocessor ROM checksum error
Code 2 - Interface chip diagnostic failure
Code 3 - Write Fault latch will not reset
Code 4 - Index pulse not detected during spinup
Code 5 - Unable to reach 3600 rpm in 30 seconds
Code 6 - Unable to stabilize spin speed in 10 seconds
Code 7 - Unable to maintain spin speed to 0.5%
Code 8 - Unable to uncover Track Zero sensor
Code 9 - Unable to cover Track Zero sensor
Code A - Track Zero interrupter misadjusted
Code B - Shipping zone error, crash stop misadjusted
Code C - Carriage stuck during recal error
Code D - Seek error during burn-in or recal
Code E - No hall transitions during spin-up
Code F - Unexpected interrupt from processor
MFG
OS
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