HP 9122D User manual

HP 91220/5 Disc Drives
Service Manual
Manual part number: 5957-6559
Prin ted: APRIL 1 988
Printed in U. s. A.
rL:' HEWLETT
a!~ PACKARD
HEWLETT -PACKARD
Edition 2
E0488
P.O. Box 39, Boise, Idaho 83707-0039

Notice
The information contained in ':his document is subject to change without notice.
HEWLETT-PACKARD ~lA](ES NO WARRANTY OF ANY KIND WITH REGARD TO THIS
MATERIAL. I;SCLUDI~G. BliT NOT LI"lITED TO, THE IMPLIED "[ARRA!'iTIES OF
~IERCHANTABILITY A~D lFITNESS FOR A PARTICULAR PURPOSE. HEWLETT-PACKARD shall
not be liable for I!rrors contained herein or for incidental or consequential damages in connection with the
furnishing, performance: or use of this material.
HEWLETT-PACKARD assumes no responsibility for the use or reliability of its software on equipment
that is not furnished by HE'N'l.ETT-PACKARD.
This document contains proprietary information, which is protected by copyright. All rights are reserved.
N'J part of this document may be photocopied, reproduced or translated to another language without the
prior written consent of HEWLETT-PACKARD Company.
Copyright @ 1984, 1988 by HE\VLETT-PACKARD
b

Printing History
New editions are complete revisions of the manual. Update packages, which are issued between editions,
contain additional and replacement pages to be merged into the manual by the customer. The dates on
the title page change only when a new edition or a new update is published. No information is incor-
porated into a reprinting unless it appears as a prior update; the edition does not change when an update is
incorpora ted.
A
software code may be printed before the date; this indicates the version level of. the software product at
the time the manual or update was issued. Many product updates and fixes do not, require manual chang-
es and, conversely, manual corrections may be done without accompanyi~gproduct changes. Therefore,
do not expect a one-to-one correspondence between product upd'ates and manual updates.
Edition 1. ....................................................... JUNE 1984
Edition 2 ........................................................ APRIL 1988
c

Contents
Cha pter 1 Page
Genera) Information 1- 1
Introduction .................... '.' . . . . .. . . .. . . . . . . .. . . . . . . .. . . . . . . .. . . . . . . .. . . . . .. . . . . .. .. . .. . . .. . . . . .. . .. 1-1
Technical Specifications .......................................... '" .. . . . .. . . . . . .. . . .. . .. ... .. . . . .. . .. .. .. .. . . . .. 1-1
Power Requirements ..... :. . . .. . . . . .. . .. .. .. .. .. . .. . . . .. . . . . .. . . . .. . .. .. . . .. . . .. . . . . . . .. .. . .. . . . .. . .. . . .. . ... . .. .. . .. .. . .. 1- 2
Environmental Specs ............. : " ...... , ............................................................................... 1- 2
Equipment Supplied ......... ,. . .. .. . . . . . .. . . .. . .. .. .. .. . . .. . . . . .. . . . . . . . . . .. . . .. . .. . . . . . . . .. . . .. . .. . .. .. . . .. . .. .. .. .. ... 1- 3
Unpacking the HP 9122D/S Disc Drive ................................................................... , ........ 1- 3
Cleaning the Case. . .. . . . . . .
.. . . .. .. .. . .. .. .. . . . . .. .. . .. .. .. . .. . .. . . . .. .. . .. . . . . .. . . . .. . . .. . . .. . .. . . . . .. . . .. . .. .. . . .. . . .. . . . . .. 1- 4
Chapter 2 Page
Installation 2-1
Configuring Po'~er ...................................................................................................................... 2-1
Setting The Line Voltage Select Switch .............................................................................. 2-1
Fuses ...................... " ............. "" ..................................................................... , .......................... 2-1
Power Cords ............................................................................................................................ , 2- 1
Selecting the Device Address. . . .. .. .. .. .. .. .. . .. . .. .. . . .. .. .. . . .. .. .. . .. .. .. . . . . . .. . . . . . . .. .. . . .. .. .. . . . .. .. . . .. .. .. .. .. .. .. .... 2- 2
Disc
Compatibility ................................................................................................................. 2-3
ControIs and Indica tors. .. .. . . .. . . .. . .. . . . .. .. ... . .. . . .. .. . .. . . . .. .. . .. .. . .. . .. .. . .. .. . . . . .. . . .. . . . . . .. . . .. .. .... . .. . .. .. . .. . ... 2- 4
Media Moni tor ........... ,. . . . .. . .. . . . .. .. .. . . .. .. . .. . . .. .. .. .. . . .. . .. . . .. .. . . . .. .. . .. .. . . . . . .. .. . . .. .. . .. . .. .. .. . . . . .. .. . ... 2- 5
Power-On Selftest ............................................................................................................. 2-5
Write Protect Error on Initialization .................................................................... 2-5
Chapter 3 Page
Interface Information 3-1
HP-IB Interface ...................................................................................................... 3-1
Instaiiation. . .. . . . . .. . . . . .. . . . .. . . . . . .. . .. . . .. . . . .. . . . . . .. . . . . . . .. . . . . . . . .. . . . . . . . .. .. . . . .. . .. . . .. . .. ... .. 3- 1
HP-IB Interface Restrictions ............................................................ , ............. '" .......... 3-1
Chapter 4
Trou bleshooting
Page
4-1
Repair Philosophy .................................................................................................... 4-1
Non -Exchange Assemblies ......................................................................................... 4-1
Exchange Assemblies ......................................................................................... 4-1
Controller Electronics and Power Supply Assembly .......................................................... 4- 2
e

Contents (continued)
5elftest ......................... , ......................................................................... 4-4
Available Tests ........................................................................................ 4-4
Selecting a 5elftest . . . . . . . .. . .. . . . .. . . . .. . . . . .. . . . . . . . .. . . . .. . . . . . .. . . . . . . .. . . ... .... .. . ... .. .. ... . .. .. 4- 5
Troubleshooting Procedures .............................................................................. 4-6
Fault Isolation Procedures ............................. '" ........... _ ...... , .......... _ ... _ ...... _ ... 4-6
Troubleshooting Proc~~dures_ ... _. _ .... _ .. _. _ .......................................................... 4-6
Troubleshooting Flowchart. '.' ........................................................................ 4-7
Using the 55/80 Exerciser .. ': ....................................................................... 4-11
DERRORS ........................................................................................... 4-11
Hints on Using the 55/80 Exerciser .................................................................. 4-12
Adjustments ................. '.' ................................ , ...... " .............. , ................. 4·-14
PLL Adjustment ..................................................................................... 4·-14
Chapter 5
Assembly Access
Page
5-1
Introduction ................... ,. . . . .. . . . .. . . . . . . . .. . . .. . . . . .. . . . . . . .. . . . . . . . . . . .. . . .. . . . .. . .. . . . .. . . .. .. 5-1
9122D/5 Parts List ...................................................................................... 5-1
Chapter 6
Product History
Page
6-1
Introduction ................ " ............................. " ................................. , ...... " .. 6-1
5.ervice Note History. . . . . . . . . .. .. . . . .. . . . . . . . . . . ... . . .. . . . . . . .. . . . . . . .. . . . . . . . . . . . .. . . . .. .. ... .. .... . . . . .. 6-1
f

iCHAPTER I
GENERAL INFORMA TION
I 1 I
Introduction
The HP 9122 disc drives are random access data storage devices. The HP 9122S contains a single 3
1/2-inch -double-sided drive and the HP 9122D contains two 3 I/2-inch double sided disc drives. The
storage capacity ranges from 630K bytes to 78SK bytes depending on the sector size beng used.
The HP 9122 dics drives have beeR designed using the SUBSET 80 command set. Refer to the Subset 80
Reference Manua~, PN 595.8-4129, for a complete description of this command set.
Technical Specifications
Number of drives
Net Weight
Height
Depth
Width
Interface
HP Double-Density Format
Encoding
Rotational Speed
Bit Density @600 RPM
Track Density
Tracks per Surface
Surfaces used per disc
HP 9122S
HP
9122D
1 2
3.6kg (8.5 lbs)
76 mm (2.99 in.)
285 mm (1 1. 2 in.)
325 mm (12.8 in.)
4.5 kg
(10 lbs)
76 mm
(2.99
285
mm ( 11 .2
325
mm
(12.8
HP-IB
MFM
600 RPM
Track 79 (Inside track) 8717 BPI
135 tracks per inch
80
2
in. )
in. )
in. )
1- 1

GENERAL I!'FOR~IATION
1-2
Double-sided Single-sided
Capacity
Bytes/Sector
256 512 1024
Sectors/Track
16 9 5
Tracks
80 80 80
Data Tr,acks ~\vailable
(----
154 ------>
Access Time
Track-to-Track Seek
Maximum Track-to-Track
Seek (8a t r ack ~i )
Average Track-to-Track
Maximum Rotational Latency
Average Rotational Latency
Spindle Motor on time
Maximum Data Access Time
(Seek plus Latency
plus Motor on time)
Average Data Access Time
15 ms/tri!:ck,
1242
ms
447 ms
100
ms
50
ms
400
ms
1.742 s
497 ms
NOTE
256
16
70
66
plus 42 ms settling
The HP 9122 disc drives spare four complete tracks and
reserve two tracks for system use with double sided
formats, and spare four tracks in single sided format.
Power Requirements
86-125 volts or 195-250 volts @67 watts RMS (94 voltamps)
50-60 Hertz
Fuse lA, 250 for 115V setting
.5A, 250 for 230V setting
Operating Limits
Temperature
HumiditY'
Altitude'
Non-operating Limits
(Storage and Transit)
Temperature
Altitude
Environmental Specs
10 to 40°C (50 to 104°F)
20 to 80r. with maximum wet bulb
temperature (non-condensing) not
toe xceed 29 °C (85 0 F) .
o to 4572 m (0 to 15,000 tt)
-40 to 60°C (-40 to 140°F)
-304 to 15240 m (-1000 to 50,000 tt)

GE~ERAL I~FOR~fATION
NOTE
The flexible disc in the HP 9122 disc drives is designed for
operation in a typical office environment. Use of the
equipment in an environment containing dirt, dust, or cor-
rosive substances will cause the flexible disc drives and
medium life to be drastically reduced.
Equipment Supplied
The following equipment is supplied with each HP 9122 disc drive.
Description
AC Power Cord
Operator's Manual
Disc
Shipping Disc
Quantity
HP Part Number
Dependent on location
09122-90020
N/A
1150-1786
A package of ten discs, product number 92192A, is available from DMK.
Unpacking The HP 91 220/S Disc Drive
The disc drive was carefully inspected before shipment. Remove the unit from the shipping carton and
carefully inspect the unit for any physical damage that may have occurred during shipment. If you find
any damage, you should immediately notify the dealer and file a claim with any carriers involved.
[CAUTION I
The disc drive is a precision instrument. Mechanical shock can
misalign the read/write head, resulting in read errors and/or
damaged discs whether the disc is operating or not.
When moving the disc unit, care must be taken to prevent ex-:
cessive shock. Install the shipping disc (P /N 1150-1786 for
half height drives and 1150-1787 for full height drives)
before moving it to another location. If you do not have the
parts metioned, they may be purchased from Hewlett Packard.'
1-3

GE",ERAL I\:FOR\1A TIO~
Cleaning the Case
The disc drive case is made from a white plastic material and is not painted. The rear panel has a durable,
non-toxic label. In the event of damage to the case finish, consult your HP Sales Office for touchup paints.
I CAUTION I
Chemical spray-·on cleaners used for appbances and other
household and industrial applications may damage the case
finish.
Do not use detergents that contain ammonia, benzenes,.
chlorides, or abrasives.
Before cleaning the case, disconnect the power cord and HP-IB cables. Make sure that any disc is removed
from the drives. Dampen a clean, soft, lint -free cloth in a solution of clean water and mild soap. \Vipe the
soiled areas of the case, making sure that no cleaning solution gets inside the case. For cleaning more hea vi-
ly soiled areas, a solution of 80% clean water and 20% isopropyl alcohol may be used. Dry the areas that had
cleaning solution applied with a.nother clean, soft, lint-free cloth. A non-abrasive eraser may be used to
remove pen and pencil marks.
1-4

ICHAPTER I
Installation
121
Configuring Power
Setting The Line Voltage Select Switch
The voltage select switch on the rear panel must be set to the nominal line voltage for the area in _which it
is operating. Figure
2-1 shows the setting for the voltage select switch for the various voltages.
[g]@
OR
11SV
Figure 2-1. Line Voltage Select Switch
Fuses
The part numbers of the fuses used for the two voltage ranges of 90-125 and 180-250 VAC are
2110-0001 and 2110-0012 respectively.
Power Cords
'~.A~f(~~~5
. -' ..
Always disconnect the disc drive from any AC line before
changing fuses.
The power cord supplied by HP has polarities matched to the power sockets on the equipment. See Figure
2- 2 for details on the power cords.
2-1

InstallathJn
lUI.. and <:SA!1fJPf'OY9d for U84t in the United States ot Am&rica and Canada Wh equipment set
tor either 100 :')t 120 Vac ~Ition.
2Ul and CSA ar-proved for USE' in the Ur4ted States of America and Canada with equipment set
tor eithit' 2GO or 240 Vac, ooenltion.
Figu.re 2- 2. A vaila bIe Power Cords.
Selecting the Devic~! Addn~ss
Each device in an HP-IB system must be set to a unique device address. The HP 91220/5 contains address
switches located on the rear panel for programming in this address. 5ee the mass storage information of
your controller for aJdressing inf'Jrma tiCin concerning mass storage devices. See Figure 2- 5 for switch loca-
tions. An HP-IB address of 0 is set at the factory before shipment.
Prior to setting the device address switches, turn the disc drive AC line switch OFF. This is because part of
the seIftest and power-up sequen,;e includes a check to see what the address switch settings are. Each time
power is applied to the disc drive these switch settings are checked, so if you change the switches be sure to
cycle the power switch.
The switches can be set to anyone of eight addresses, from 0 through 7. Refer to Figure 2- 3 when setting
these switches to the desired device address.
2-2

Installation
Position of 4 small switches
-
Middle
Middle
Address
Left Left Right
Right
0
Down
Down
Down
Down
1
Down Down Down
Up
2
Down
Down
Up
Down
3
Down
Down
Up
Up
4
Down Up
Down
Down
5
Down
Up
Down
Up
6
Down
Up Up
Down
7
Down
Up
Up Up
Figure 2-3. Device Address Switch Settings
Disc Compatibility
The table in Figure 2 -4 details the recommended usage of single-sided and double discs. Words used in the
table are defined as follows:
*"Exchange only" means that the disc should be used only for exchanging
data and programs with single-sided disc drives, and should not be used
on a daily basis.
*"OK
II
means that the disc may be used on a daily basis.
Single-sided
HP
disc
exchange only
Double-sided
HP media in OK
single-sided format
Double-sided
HP media
in OK
double-sided format
HP
software
OK
Figure 2-4. Usage of Single- and Double-sided Flexible Discs.
2-3

Insta llat ion
2-4
Controls and Indicators
-..a-.rTT
--1CeI -
9122
AC Power SWit-Ch--7
Disc Access Light
for Drive 0
Disc Eje t Button
for Drive 0 Disc Eje t
Button
for Drive 1
SelHest Indicate,r
(Viewed through
Air I . I
Seriol number prefix 2518A and below Disc Ac<::es3 Un, ht
Irttake Slel~) . . ':I
== I!i = :==== I
9122
Il
II
It
---
V
r=:ll
i
,/
2
/ /
/'
Disc Access Light Disc
Eje< t Button
for Drive 0
for Drive 0
=E:=J=~
7
AC POW?SWitCh 7
r"
Self test Indicato
(View·ed through Air
Lntake Slots)
ISenol num~r p~fix 2614A and above I
for Drive 1
II
V \
t::ll
/
If
/ Disc
Ejec t Butto
for Drive 1
Disc Ac<::ess Ught
for Drive 1
AC INPUT
n
~~ 10
~~ O~o
--1~~O@fl LU
o
L o O[_,.:JO
~ ~ I [IJ]] 0
~-'+'----~-------------l~!-i
ADDRESS/
TEST SELECT
HP-IB
IALL serial number prefixes I
Figure 2- 5. Controls and Indicators.
AC
SELECT SW
FUSE

Installation
~ledia ~lonitor
Through a feature called Tvfedia l\fonitor, the disc drive automatically monitors the cumulative use of each
individual disc. When the usage of a disc is approaching a level at which there is a risk of loss of data
through normal disc wear, the disc access light on the front panel blinks and a clicking sound is heard.
Commands will still be performed by the computer. However, after a command has been performed, the disc
drive immediately resumes the warning indication.
When the Media Monitor warning occurs, immediately copy your disc. If you continue to use this disc, the
disc drive will eventually automatically write protect the disc. After that time, you will only be able to
read data from the disc or copy the disc.
Power-on Selftest
A power-on selftest is performed automatically when you turn on the disc drive. The selftest first checks
the HP-IB, FDC, RAM, and ROM, followed by a WRITE/READ test (if an initialized, non write-protected
disc is inserted). When a WRITE test is 'performed, it is done on a reserved area of the disc and no user data
is at risk. The Selftest LED acts as a pass/fail indicator and is visible through the air intake slots.
When an initialized, unprotected disc is inserted; read, write, and motor-speed tests are performed. A write-
protected disc will not allow the read and write tests to run. If the disc access light stays on after the nor-
mal testing time, an error within the disc drive has been detected. If an error occurs, refer to Chapter 4 for
troubleshooting procedures.
Write Protect Error on Initialization
A motor speed check is performed before initialization is performed. If the motor speed is on either side of
the tolerance allowed, a Write Protect Error is generated and the disc cannot be initialized. At this point,
insert another disc. If a write protect error is generated again, refer to Chapter 4 for troubleshooting
procedures.
If no write protect error occurs with the second disc, then the first disc used is bad and should
be discarded.
2-5

ICHAPTER I
Interface Information I 3 I
HP -18 Interface
Installation
The HP 91220/5 is connected to the computer via the Hewlett-Packard Interface Bus (HP-IB). Refer to
Figure 3-1 for a list of the HP-IB interface c~bles used with HP computers.
Length Accessory
Number
1 metre 1
0833 A
2 metres
10833B
4 metres 10833C
0.5 metres 10833D
Figure 3-1. HP-IB Interface Cables
All the cables listed above are completely shielded to eliminate Radio Frequency Interference (RFI). The use
of unshielded cables will cause increased RFI in the area of operation.
I CAUTION I
Never turn the disc drive off or remove the disc from the
drive when the disc access light is on; doing so can cause loss of
data.
HP-IB Interface Restrictions
1. All the AC line switches (of the host system) must be turned "OFF" when connecting (and disconnecting)
devices to the system.
2. The total length of cable permitted in one bus system must be less than or equal to two metres times the
number of devices connected together (the interface card is considered one device).
3. The total length of the cable must not exceed 20 metres. For example, a system containing six devices
can be connected together with cables that have a total length less than or equal to 12 metres (six
devices x 2m/device = 12 metres). The individual lengths of cable may be distributed in any manner
desired as long as the total length does not exceed the allowed maximum. If more than 10 devices are to
3-1

Interface Information
be connected together, cables shorter than two metres must be used between some of the devices to keep
the total cable length less than 20 metres.
4. The max:imum number of devices that can be connected together in a one-bus system is 15.
There are no restrictions to the way cables may be connected together; however, it is recommended that no
more than four piggyback conneGtors be stacked together on one device. The resulting structure could exert
enough force on thf~ connector mounting to damage it.
3-2

ICHAPTERi
~T_r_o_ub_l_e_s_ho_o_t_in __ g ____________ ~1 4 I
Repair Philosophy
The HP 9 12 20/S are serviced on the exchange program.
Part Number
09123-61611
09121-61611
09121-68511
09121-61612
09122-68802
2110-0001
2110-0012
09122-69511
09122-69514
09114-69511
09123-69101
Non-Exchange Assemblies
Description
SIN Prefix
2614A
and above
-
RIBBON CABLE ASSEMBLY
X
RIBBON CABLE ASSEMBLY
FAN ASSEMBLY
X
DC POWER CABLE
LINE FILTER ASSEMBLY
X
FUSE 1A 250 VOLT
X
FUSE 1/2A 250 'VOLT
X
Exchange Assemblies
Controller
PCA
Controller PCA
X
3 1/2-inch
disc
drive
3
1/2-inch
disc
drive
X
SIN Prefix 2518A
and below
X
X
X
X
X
X
X
X
4-1

TROUBlESHOOTLSG
Controller Electronics and Power Supply Assembly
Figure 4-1 represents the powet supply and controller electronics (SIN Prefix 251 8A and below) of the
printed circuit assembly (peA). Figure 4- 2 represents the supply and controller electronics (SIN Prefix
2614-A, 2615A and above) of the peA.
The following information applies to both controller peAs shown in Figure 4-1 and 4- 2. Jumper J6 is used
to configure the controller peA for either a single disc drive or for two disc drives (9122S or 9122D respec-
tively). J7 is used to start the service tests. Jumper J6 is shown in the 91220 position, and J7 is shown in
the normal operating position.
4-2
SW1
TP1
o TP 2
o
L, __ -,D J5
pu.)~
R11
CJ CJ
JJ J4
09122-69501
TPt +5VOC
TP2 +12VOC
TPJ -IZVOC
TP4 GNO
TP5 INDEX
TP6 TRKO
TP7 READ DATA
TP8 WRITE DATA
TP9 eNO
TPl0 +5VOC
TP 11 Re;..o eLK
'------.., 0 TP J () LED 1
-~
SELFrEST LED
HP-18
SELECT CODE
1 f
L
o •••• --'tt - ip--r
" .. ,- . ........r--- ___ -J
TP9
o o
TP 10
TP7
TP 50 0
o TP8 0
TP6
Jt
J1 TO FlEXIBLE OISC ORI\IES
J2 HP-IB
JJ,J4 ~R TO OISC ORIVES
J5 TO F"AN
J6 SINGLE OR DOUBLE
J7 SEFMCE TEST
Fuse F2 is fo" +5V and -11Y supplies
Fuse F3 is for the +12V siupply and the Fan
Fi~~ure 4-1. Controller and Power Supply PCA(09122-6951l)