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EK-RZXXD-PS

October 2000

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Document:	RZxx Disk Drive Subsystem Pocket Service Guide
Order Number:	EK-RZXXD-PS
Revision:	000
Pages:	48
Original Filename:	https://manx-docs.org/collections/mds-199909/cd3/disk/rzxxdpsg.pdf

OCR Text

RZ Series Disk Drive
Pocket Service Guide
Order Number: EK-RZXXD-PS. G01

October 1993
Digital Equipment Corporation makes no representations
that the use of its products in the manner described in
this publication will not infringe on existing or future
patent rights, nor do the descriptions contained in this
publication imply the granting of licenses to make, use,
or sell equipment or software in accordance with the
description.
© Digital Equipment Corporation 1993.
All Rights Reserved.
Printed in U.S.A.
The following are trademarks of Digital Equipment
Corporation: DEC, DECmailer, DECservice, DSA,
DSSI, MicroVAX, MSCP, Q–bus, SERVICenter, VAX,
VAXsimPLUS, VMS, and the DIGITAL logo.

Contents
1 Introduction
1.1
1.2
1.3

Formatted Capacity . . . . . . . . . . .
Service Strategy . . . . . . . . . . . . . .
Associated Documents . . . . . . . . . .

1–2
1–2
1–2

2 Configurations
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9

RZ22 and RZ23 Disk Drive
Configuration . . . . . . . . . . . . . . . .
RZ23L Disk Drive . . . . . . . . . . . . .
RZ24 Disk Drive . . . . . . . . . . . . . .
RZ24L Disk Drive . . . . . . . . . . . . .
RZ25 Disk Drive . . . . . . . . . . . . . .
RZ25L Disk Drive . . . . . . . . . . . . .
RZ26B Disk Drive . . . . . . . . . . . . .
RZ55, RZ56, RZ57, and RZ58 Disk
Drives . . . . . . . . . . . . . . . . . . . . .
RZ73 Disk Drive . . . . . . . . . . . . . .

2–2
2–4
2–5
2–6
2–7
2–9
2–12
2–14
2–16

3 Troubleshooting
4 FRU Procedures
4.1
4.2
4.3
4.4
4.5

Service Strategy . . . . . . . . . . . . . .
Removing and Replacing RZ22 and
RZ23 FRUs . . . . . . . . . . . . . . . . .
Replacing RZ23L, RZ24, RZ24L,
RZ25, RZ25L, and RZ26B FRUs . . .
Removing and Replacing RZ55
FRUs . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing RZ56,
RZ57, and RZ58 FRUs . . . . . . . . . .

4–1
4–2
4–4
4–5
4–8

iii

4.6

Removing and Replacing RZ73
FRUs . . . . . . . . . . . . . . . . . . . . .

4–11

5 Recommended Spare Parts
Figures
2–1

RZ22 and RZ23 Drive Module
Layout . . . . . . . . . . . . . . . . . .

2–2

RZ23L Drive Module
Layout . . . . . . . . . . . . . . . . . .

2–4

2–3

RZ24 Drive Module Layout . . .

2–5

2–4

RZ24L Drive Module
Layout . . . . . . . . . . . . . . . . . .

2–6

2–5

RZ25 Drive Module Layout . . .

2–7

2–6

RZ25L Drive Module
Layout . . . . . . . . . . . . . . . . . .

2–9

RZ26B Drive Module
Layout . . . . . . . . . . . . . . . . . .

2–12

RZ55, RZ56, RZ57, and RZ58
Drive SCSI Connectors . . . . . .

2–14

2–9

RZ73 Drive SCSI
Connectors . . . . . . . . . . . . . . .

2–16

3–1

RZxx Troubleshooting
Flowcharts . . . . . . . . . . . . . . .

3–2

4–1

RZ22 and RZ23 Drive
Module/Frame Removal . . . . . .

4–3
4–6

2–7
2–8

4–2

RZ55 Drive Bezel Removal . . . .

4–3

RZ55 Drive Module
Removal . . . . . . . . . . . . . . . .

4–7

4–4

RZ56 Bezel Removal . . . . . . . .

4–9

4–5

RZ56, RZ57, and RZ58 Drive
Module or HDA Removal . . . . .

4–10

4–6

Separating the RZ73 HDA from
the Drive Module . . . . . . . . . .

4–12

4–7

Disconnecting the RZ73 Flex
Circuit . . . . . . . . . . . . . . . . . .

4–13

RZ22 and RZ23 Jumpers . . . . .

2–3

Tables
2–1
2–2

RZ23L Jumpers . . . . . . . . . . .

2–4

2–3

RZ24 Jumpers . . . . . . . . . . . .

2–5

2–4

RZ24L Jumpers . . . . . . . . . . .

2–6

2–5

RZ25 Jumpers (J5 and J6) . . . .

2–8

2–6

RZ25L Jumpers (J2, J5, and
J6) . . . . . . . . . . . . . . . . . . . .

2–10

2–7

RZ26B Jumpers . . . . . . . . . . .

2–13

2–8

RZ55, RZ56 RZ57, and RZ58
Drive SCSI ID . . . . . . . . . . . .

2–15

RZ73 SCSI ID Selection . . . . . .

2–17

2–9

1
Introduction
The RZ22, RZ23, RZ23L, RZ24, RZ24L, RZ25, RZ25L,
and RZ26B hard disk drives are half-height, highdensity, 3.5-inch Winchester disk drives for use with
low-end desktop and workstation systems. These
random-access rotating memory devices store data
in fixed-length blocks on 90-mm, thin film, rigid
media disks. The drives are designed to be mounted
horizontally, vertically, and upside-down. They have
small computer system interface (SCSI) capability.
The RZ55, RZ56, RZ57, RZ58, and RZ73 hard disk
drives are high-performance 5.25-inch drives. These
random-access rotating memory devices store data
in fixed-length blocks on 130-mm, thin film, rigid
media disks. The drives are designed to be mounted
horizontally or vertically in a system enclosure (such
as a BA213 or BA400) or expansion box (such as the
BA40 or BA42).
The RZ series disk drives conform to the common
command set (CCS). The medium contained within
each RZ series disk drive is a fixed, nonremovable
head/disk assembly (HDA).

Introduction 1–1

Introduction
1.1 Formatted Capacity

1.1 Formatted Capacity

3.5-Inch Drives
RZ22
RZ23
RZ23L
RZ24
RZ24L
RZ25
RZ25L
RZ26B

52Mb
104Mb
121Mb
209Mb
245Mb
426Mb
535Mb
1.05Gb

5.25-Inch Drives
RZ55
RZ56
RZ57
RZ58
RZ73

332Mb
665Mb
1.0Gb
1.3Gb
2.0Gb

1.2 Service Strategy
For the RZ23L, RZ24, RZ24L, RZ25, RZ25L, RZ26B,
and RZ58 the entire disk drive is replaced. For the
RZ22, RZ23, and RZ55 disk drives replace the drive
module and then the entire drive option. For the
RZ56, RZ57, and RZ73 disk drives replace the drive
module and then the HDA.

1.3 Associated Documents
DECstation 3100 Maintenance Guide
EK-291AA-MG
DECstation 2100/3100 Maintenance Guide
EK-291AB-MG
DECstation 5000 Maintenance Guide
EK-370AA-MG
MicroVAX 3100 Maintenance Guide
EK-A0297-MG
VAXstation 3100 Maintenance Guide
EK-285AA-MG
VAXstation 35xx Maintenance Guide
EK-258AA-MG

1–2 Introduction

2
Configurations
The RZ series disk drives are not designed to be
internally terminated. The SCSI bus, however, must
be terminated. Therefore, termination must be done
within the host system itself or expansion boxes.
Refer to the figures in this chapter for the location of
the SCSI ID jumpers.
If you receive a drive or drive module with the
terminator resistor packs installed, use needlenose
pliers to remove them. The terminator resistor packs
are located just behind the SCSI port connector.
Refer to the system documentation for information
on the correct termination of the SCSI bus. A brief
list of system maintenance guides can be found in
Section 1.3.

Configurations 2–1

Configurations
2.1 RZ22 and RZ23 Disk Drive Configuration

2.1 RZ22 and RZ23 Disk Drive
Configuration
Figure 2–1 RZ22 and RZ23 Drive Module Layout
TERMINATOR
PACKS
SCSI ID
JUMPERS

CONNECTOR TO
HDA MODULE

50 PIN SCSI
SIGNAL
CONNECTOR

E1
E2
E3

J4
E6

PARITY
JUMPER

POWER CONNECTOR
SEE FOOTNOTE 2 IN TABLE 2-1
SHR_X1141B_89

2–2 Configurations

Configurations
2.1 RZ22 and RZ23 Disk Drive Configuration

Table 2–1 RZ22 and RZ23 Jumpers
SCSI ID

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

Out
Out
Out
Out
Out
Out
Out
Out

E51 is Out

E61 is In

1 E5 and E6 are present on drive/modules with revision levels BO2 or

higher. Manufacturing use only.

Configurations 2–3

Configurations
2.2 RZ23L Disk Drive

2.2 RZ23L Disk Drive
Figure 2–2 RZ23L Drive Module Layout
CONNECTOR TO
HDA MODULE

TERMINATOR
PACKS

50 PIN SCSI
SIGNAL
CONNECTOR

E1
E2
E3

SCSI ID
JUMPERS

POWER
CONNECTOR
GSF-AX0115-02-DG
SHR-X0166-90

Table 2–2 RZ23L Jumpers
SCSI ID

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

2–4 Configurations

Configurations
2.3 RZ24 Disk Drive

2.3 RZ24 Disk Drive
Figure 2–3 RZ24 Drive Module Layout
TERMINATOR
PACKS

SCSI ID
JUMPERS

50 PIN SCSI
SIGNAL
CONNECTOR
E3

E1
E2

POWER
CONNECTOR

PARITY
JUMPER

CONNECTOR TO
HDA MODULE

SHR_X1142A_89

Table 2–3 RZ24 Jumpers
SCSI ID

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

Configurations 2–5

Configurations
2.4 RZ24L Disk Drive

2.4 RZ24L Disk Drive
Figure 2–4 RZ24L Drive Module Layout

SS EP WS

A0 A1A2

SCSI Connector
To
HDA

Power Connector

rz24l_mod_layout.rags

Table 2–4 RZ24L Jumpers
SCSI ID

0
1
2
3
4
5
6
7

Out
Out
Out
Out
In
In
In
In

Out
Out
In
In
Out
Out
In
In

Out
In
Out
In
Out
In
Out
In

2–6 Configurations

Configurations
2.5 RZ25 Disk Drive

2.5 RZ25 Disk Drive
Figure 2–5 RZ25 Drive Module Layout
JUMPER

1 2 3 4 5 6 7 8

DRIVE
FRONT

PIN 1
DRIVE FRONT
J6

DRIVE MODULE

PIN 1 (TOP ROW)
J4
J3 PIN 1
J5
J4
SCSI I/O
CONNECTOR
A 0 A1 A2
J3
DC POWER
CONNECTOR

PIN 1
J5

*
SCSI ID
SELECT HEADER

* SEE TABLE IN TEXT

mkv−r1042a−93

Configurations 2–7

Configurations
2.5 RZ25 Disk Drive

Table 2–5 RZ25 Jumpers (J5 and J6)
SCSI ID (J5)

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

Jumper 2

Out

Spin-up on power-up.

Spin-up on SCSI command.
Note that jumpers 5, 7, and 8 are always
present.

2–8 Configurations

Configurations
2.6 RZ25L Disk Drive

2.6 RZ25L Disk Drive
Figure 2–6 RZ25L Drive Module Layout

J2
T
P

T
P

R
E
S

P
E

W
P

M
E

D
S

R
E
S

Pin 1

DC Power
Connector
J2

SCSI
Connector

A 2 A 1 A0

A
A
A

Pin 1

2
1
0

SSP

Pin 1

LED
RES

Configurations 2–9

Configurations
2.6 RZ25L Disk Drive

Table 2–6 RZ25L Jumpers (J2, J5, and J6)
J21
Setting

Description

RES
Reserved.

Off/On
DS

Off

Spin-up on power-up.

Off

Spin-up on SCSI command.

Off

Spin-up delayed by SCSI ID times 12
seconds after powerup.

Spin-up on START UNIT command from
host. Delayed start is overridden and does
not apply when ME is installed.

WP
On

Write protection enabled.

Off

Write protection disabled.

PE
On

Parity checking and parity error reporting
enabled.

Off

Parity checking and parity error reporting
disabled

RES
Reserved.

Off/On
TP

Off

No terminator power connected to drive
terminators or SCSI bus I/O pin 26.

Off

Drive supplies its own terminator power
only.

1 Underlined functions are factory defaults.

(continued on next page)

2–10 Configurations

Configurations
2.6 RZ25L Disk Drive

Table 2–6 (Cont.) RZ25L Jumpers (J2, J5, and J6)
J21
Setting

Description

Off

Drive supplies power to SCSI bus I/O pin
26 only. When drives have differential
I/O circuits, a jumper on the right TP
position may be needed to power external
terminators.

Drive supplies terminator power to itself
via an internal connection and to SCSI
bus I/O pin 26. This is a legal jumper
setting.

TP Position A
On

Horizontal jumper across both TP
positions closest to the PCB edge; connects
terminator power from SCSI bus I/O pin
26 to the drive’s internal terminators.

Off

See above explanations for TP jumpers.
disabled

J5 & J62
SCSI ID

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

1 Underlined functions are factory defaults.
2 Use either J5 or J6, but not both.

Configurations 2–11

Configurations
2.7 RZ26B Disk Drive

2.7 RZ26B Disk Drive
Figure 2–7 RZ26B Drive Module Layout

J1
Pin 1

J4
Pin 12

J3
J8
J3
J5
1

J6
J2
1

2–12 Configurations

Configurations
2.7 RZ26B Disk Drive

Table 2–7 RZ26B Jumpers
SCSI ID (J4)

0
1
2
3
4
5
6
7

Out
In
Out
In
Out
In
Out
In

Out
Out
In
In
Out
Out
In
In

Out
Out
Out
Out
In
In
In
In

Jumper 5

Out

Spin-up on SCSI command.

Spin-up on power-up.

Jumper

Position

Description

J6(pins 1-2)

Power to SCSI Busterm
Power.

J2(pins 1-2)

Active terminators disabled.

Configurations 2–13

Configurations
2.8 RZ55, RZ56, RZ57, and RZ58 Disk Drives

2.8 RZ55, RZ56, RZ57, and RZ58 Disk
Drives
Figure 2–8 RZ55, RZ56, RZ57, and RZ58 Drive SCSI
Connectors

DRIVE ID:

1
2
3

RZ57 (spin up option)

DRIVE
JUMPER

RZ58 (spin up option)

SHR-X0019-90

2–14 Configurations

Configurations
2.8 RZ55, RZ56, RZ57, and RZ58 Disk Drives

Table 2–8 RZ55, RZ56 RZ57, and RZ58 Drive SCSI
ID
SCSI ID

0
1
2
3
4
5
6
7

Out
Out
Out
Out
In
In
In
In

Out
Out
In
In
Out
Out
In
In

Out
In
Out
In
Out
In
Out
In

The RZ57 and RZ58 can be set to spin up when power
is applied to the host system. These jumpers can be
seen in Figure 2–8.
Note that when the jumper is removed on the RZ57,
the spin up option is enabled. The spin up option
is also enabled when the jumper is in place on the
RZ58. When the spin up option is disabled, the drive
will only spin up with a SCSI command.

Configurations 2–15

Configurations
2.9 RZ73 Disk Drive

2.9 RZ73 Disk Drive
Figure 2–9 RZ73 Drive SCSI Connectors

REAR VIEW OF A RZ73 DISK DRIVE

(Differential and Single−Ended Connectors)
Power

12V
5V

19 Remote Panel 1

2 10 1
Spin−Up SCSI ID

SCSI Interface Connector

1
SCSI Terminator Resistor Packs

GND
Single Ended
SCSI Interface Connector

1
1
SCSI Terminator Resistor Packs

NOTE: The three resistor packs must be inserted with
their pin 1 correctly aligned with the connector.
rz73_conns.rags

2–16 Configurations

Configurations
2.9 RZ73 Disk Drive

Table 2–9 RZ73 SCSI ID Selection
SCSI ID

0
1
2
3
4
5
6
7

Switch Positions1
1

Out
Out
Out
Out
In
In
In
In

Out
Out
In
In
Out
Out
In
In

Out
In
Out
In
Out
In
Out
In

Jumper 13 and 14
Out

Spin-up on power-up.

Spin-up on SCSI command.

1 SCSI address 7 is normally assigned to a system adapter.

Configurations 2–17

3
Troubleshooting
The RZxx disk drives depend on system-based
diagnostics for troubleshooting. If you are going to
use these diagnostics, make sure that you adhere to
all system configuration criteria such as loopback
connectors.
Check the following to determine if the drive is faulty:
•

Make sure the drive is connected (both power and
signal cables).

•

Make sure there is power to the drive.

•

Make sure the drive is correctly configured.
Note
Check SCSI ID before and after replacing the
drive module.

Note
If the RZ23L and RZ25 disk drives fail
replace the entire disk drive.

Note
Not all RZxx disk drives will use all of the
troubleshooting flowcharts.

Figure 3–1 shows the logical procedure for
troubleshooting an RZ drive in a system.

Troubleshooting 3–1

Troubleshooting

Figure 3–1 RZxx Troubleshooting Flowcharts

START

Power
up test
passes

No
1

Yes
Run system
SCSI diagnostic
tests

SCSI
diagnostic test
passes

No
2

Yes
Return the
system to
customer
SHR-X0037-90

(continued on next page)

3–2 Troubleshooting

Troubleshooting

Figure 3–1 (Cont.) RZxx Troubleshooting
Flowcharts

Replace PCB
and re-run
power up test

Power
up test
passes

Yes

Return to
customer

Run SCSI
system diagnostics

2
SHR-X0038-90

(continued on next page)

Troubleshooting 3–3

Troubleshooting

Figure 3–1 (Cont.) RZxx Troubleshooting
Flowcharts
2

Run system SCSI
diagnostic tests

FRU
called
out

No
3

Yes
Replace FRU and
re-run SCSI
diagnostic tests

SCSI
diagnostic test
passes

Yes

No
Replace other FRU and
re-run SCSI
diagnostic tests

SCSI
diagnostic test
passes

Return the
system to
customer

Yes

CALL
SUPPORT
SHR-X0039-90

(continued on next page)

3–4 Troubleshooting

Troubleshooting

Figure 3–1 (Cont.) RZxx Troubleshooting
Flowcharts
3

Replace PCB
and re-run
SCSI diag

SCSI
diagnostic test
passes

Yes

No
Replace HDA
and re-run
SCSI diagnostic tests

SCSI
diagnostic test
passes

Return the
system to
customer

Yes

CALL
SUPPORT
SHR-X0040-90

Troubleshooting 3–5

4
FRU Procedures
This chapter describes procedures for removing and
replacing the drive module/frame on the HDA.
CAUTION
Wear a properly grounded antistatic wrist
strap, available in the Digital antistatic kit
(Part number 29-26246-00), and use care
when handling the drive.

4.1 Service Strategy
For the RZ23L, RZ24, RZ24L, RZ25, RZ25L, RZ26B,
and RZ58 the entire disk drive is replaced. For the
RZ22, RZ23, and RZ55, disk drives replace the drive
module and then the entire drive option. For the
RZ56, RZ57, and RZ73 disk drives replace the drive
module and then the HDA.
Set the SCSI ID jumpers to match those of the
replaced drive module or drive.

FRU Procedures 4–1

FRU Procedures
4.2 Removing and Replacing RZ22 and RZ23 FRUs

4.2 Removing and Replacing RZ22 and
RZ23 FRUs
Follow these steps to replace the drive module for the
RZ22 and RZ23 disk drives (see Figure 4–1):

1. Remove the drive from the system enclosure and
position the drive.

2. Remove the HDA interconnect cable at the HDA
end, not at the drive module/frame end.

3. Remove the two screws using a 1/16-inch hex
driver.

4. Holding the drive in your left hand, push the
HDA back against the rear grommets with your
right hand and pull the front of the HDA up and
straight out, away from the drive module/frame.

4–2 FRU Procedures

FRU Procedures
4.2 Removing and Replacing RZ22 and RZ23 FRUs

Figure 4–1 RZ22 and RZ23 Drive Module/Frame
Removal

HDA

FRAME

MODULE
DATA CABLE
TTB_X1236_88
SHR_X1135_89

FRU Procedures 4–3

FRU Procedures
4.3 Replacing RZ23L, RZ24, RZ24L, RZ25, RZ25L, and RZ26B FRUs

4.3 Replacing RZ23L, RZ24, RZ24L,
RZ25, RZ25L, and RZ26B FRUs
The RZ23L, RZ24, RZ24L, RZ25, RZ25L, and RZ26B
disk drives are one piece FRUS.
The term Generic SCSI Device refers to RZ23L
disk drives that are embedded in the system.
For VMS operating systems:
•

Version 5.4.1 operating system will identify the
RZ23L as an RZ23L disk drive.

•

Version 5.3.x operating system or earlier will
identify the RZ23L as a Generic SCSI Device. At
the console prompt type SHOW DEVICE. This
command will perform an inquiry to the drive
and identify the correct ID of the RZ23L disk
drive.

For ULTRIX operating systems:
•

Version 4.1 operating system will identify the
RZ23L as an RZ23L disk drive.

•

Version 4.0 operating system or earlier will
identify the RZ23L as a Generic SCSI Device. At
the console prompt type SCSI PB to display the
RZ23L as an RZ23L disk drive.

Follow the procedure described in Section 4.2.

4–4 FRU Procedures

FRU Procedures
4.4 Removing and Replacing RZ55 FRUs

4.4 Removing and Replacing RZ55
FRUs
CAUTION
Do not remove or alter any of the jumpers
on the drive module as this may result in
damage to the drive module or HDA. Set
the SCSI ID jumpers to match those of the
replaced drive module or drive.

Follow these steps to remove the bezel (see
Figure 4–2):

1. Position the drive with the module face up, and
turn the drive so the bezel is facing away from
you.

2. Unplug the LED flex cable.
3. Hold the sides of the bezel with the palms of your
hands, with your fingers resting on the front of
the bezel and position your thumbs on the back
of the bezel above the locking pins.

4. Carefully apply outward pressure to the bezel
with your thumbs until the two bezel locking pins
clear the holes in the frame. Note that the bezel
must flex about 1/8 inch to clear the pins.

5. While the bezel is flexed, slide it upward until
movement stops (about 3/8 inch). This frees the
upper bezel clips from the upper frame slots.

6. Push the bezel away from the drive. This frees
the lower bezel clips from the lower frame slots
and releases the bezel.

FRU Procedures 4–5

FRU Procedures
4.4 Removing and Replacing RZ55 FRUs

Figure 4–2 RZ55 Drive Bezel Removal

LED FLEX CABLE
CONNECTOR

BEZEL LOCKING PINS

FRAME SLOTS

BEZEL CLIPS

TTB_X1543_88
SHR-X0053-90

Once you have removed the bezel from the drive,
follow these steps to remove the drive module (see
Figure 4–3):

1. Remove the screws labeled 1, 2, 3, and 4.
2. Unplug the spindle motor connector at J5.
3. Lift the drive module up and out of the drive.
4. Unplug the preamplifier cable connector at the
auxiliary board.

5. Lift the drive module and auxiliary board up and
out of the drive.

6. Remove the screw and speednut holding the drive
module.

7. Unplug the auxiliary board from J9 on the drive
module.

4–6 FRU Procedures

FRU Procedures
4.4 Removing and Replacing RZ55 FRUs

8. Exchange the bad module with the replacement,
and check the drive module configuration.

Figure 4–3 RZ55 Drive Module Removal
SPINDLE
MOTOR
CONNECTOR

AUXILIARY
BOARD

INSULATOR

RZ55
ELECTRONICS
BOARD

INSULATOR

3
2
4

PREAMPLIFIER
CABLE
CONNECTOR
TTB_X1545_88
SHR-X0054-90

FRU Procedures 4–7

FRU Procedures
4.5 Removing and Replacing RZ56, RZ57, and RZ58 FRUs

4.5 Removing and Replacing RZ56,
RZ57, and RZ58 FRUs
Use the following procedure for the two FRUs of a
RZ56 and RZ57 disk drive.
The RZ58 disk drive is a single FRU device. However,
if the customer data is critical use this same
procedure to replace the failed drive module using the
drive module from your spare RZ58-E. If the failure
continues, return the spare drive module to the spare
RZ58-E HDA and replace the entire failed customer
drive.

CAUTION
Do not remove or alter any of the jumpers
on the drive module as this may result in
damage to the drive module or HDA. Set
the SCSI ID jumpers to match that of the
replaced drive module or drive.

To remove the bezel on the RZ56 only, refer to
Figure 4–4. (The RZ57 and RZ58 disk drives do not
have a bezel.)

1. Position the drive with the module face up, and
turn the drive so the bezel is facing away from
you.

2. Unplug the LED flex cable.
3. Hold the sides of the bezel with the palms of your
hands, with your fingers resting on the front of
the bezel. Position your thumbs on the back of
the bezel above the locking pins.

4. Carefully apply outward pressure to the bezel
with your thumbs until the two bezel-locking pins
clear the holes in the frame. Note that the bezel
must flex about 1/8 inch to clear the pins.

4–8 FRU Procedures

FRU Procedures
4.5 Removing and Replacing RZ56, RZ57, and RZ58 FRUs

5. While the bezel is flexed, slide it upward until
movement stops (about 3/8 inch). This frees the
upper bezel clips from the upper frame slots.

6. Push the bezel away from the drive. This frees
the lower bezel clips from the lower frame slots
and releases the bezel.

Figure 4–4 RZ56 Bezel Removal

LED FLEX CABLE
CONNECTOR

LOCKING PINS

FRAME SLOTS

DU
MO -X
E XX
IV XX
DR -X
29

BEZEL CLIPS

LE
X

2E)
AM
FR X
H -X
IT XX
(W
A -X XX
HD29

To remove the module, follow these steps:

SHR-X0003-90

1. Remove the screws labeled 1, 2, 3, and 4.
2. Unplug the spindle motor connector at J5.
3. Lift the drive module up and out of the drive.
4. Unplug the data cable connector at J6.

FRU Procedures 4–9

FRU Procedures
4.5 Removing and Replacing RZ56, RZ57, and RZ58 FRUs

5. Exchange the bad module with the replacement
module, and check the drive module
configuration.

Figure 4–5 RZ56, RZ57, and RZ58 Drive Module or
HDA Removal
J5

4
3

SHR-X0004-90

4–10 FRU Procedures

FRU Procedures
4.6 Removing and Replacing RZ73 FRUs

4.6 Removing and Replacing RZ73
FRUs
CAUTION
Do not handle the ISE unless you are
wearing a properly grounded antistatic wrist
strap. When working on the ISE, place it on
an antistatic pad.

CAUTION
Handle the ISE with care. Excessive shock
can cause damage to the HDA.

CAUTION
Do not lose the screws or use screws other
than those that come with the device (DEC
part number 90-00039-07). Replacement
screws must be the same type and size
(6/32 x 1/4" flathead) or the HDA might be
damaged.

Follow these steps to separate the drive module from
the HDA:

1. Remove the four screws securing the drive
module to the HDA.

2. Carefully separate the drive module from the
HDA, as shown in Figure 4–6. Be sure to lift
the drive module from the end with the DSSI
connector, separating the spindle motor from its
socket on the drive module. Take care not to
stress the flex circuit.

3. Carefully remove the connector attaching the
flex circuit to the drive module, as shown in
Figure 4–7.

FRU Procedures 4–11

FRU Procedures
4.6 Removing and Replacing RZ73 FRUs

Figure 4–6 Separating the RZ73 HDA from the
Drive Module

NOTE TO ILLUSTRATOR
USE SHR_X1050_89
FOR MODULE BOARD

SIDE 1

MA-X0962-88
SHR-X0157-90

4–12 FRU Procedures

FRU Procedures
4.6 Removing and Replacing RZ73 FRUs

Figure 4–7 Disconnecting the RZ73 Flex Circuit

NOTE TO
ILLUSTRATOR
USE SHR_X1050_89
FOR MODULE
BOARD

MA-X0961-88
SHR-X0156-90

4. Replace the faulty FRU and reconnect the flex
circuit to the connector on the drive module.

5. Swing the drive module into position over the
HDA and line up the four screw holes in the
module over the corresponding holes in the HDA.
Gently apply enough pressure to seat the pins
from the spindle motor into the spindlesocket on
the drive module.

6. Replace the four screws that secure the drive
module to the HDA. These screws MUST be
tightened firmly, as the drive module is subjected
to vibration when the device is running.

FRU Procedures 4–13

FRU Procedures
4.6 Removing and Replacing RZ73 FRUs

7. Reattach any mounting hardware and reinstall
the ISE into the enclosure.

8. Set the SCSI ID jumpers to match that of the
replaced drive module or drive.
CAUTION
Make sure the screws are not touching the
HDA.

4–14 FRU Procedures

5
Recommended Spare Parts
RZxx Disk Drive Major FRUs
Drive

Part Number

RZ22
RZ23
RZ23L
RZ24
RZ24L
RZ25
RZ25L
RZ26B
RZ55
RZ56
RZ57
RZ58
RZ73

RZ22-E
RZ23-E
RZ23L-E
RZ24-E
RZ24L-0
RZ25-E
RZ25L-E
RZ26B-E
RZ55-E
n/a
n/a
RZ58-E
n/a

ID Jumpers

Part Number

.019 inch
.025 inch

29-28229-01
29-28228-01

Continued on the next page.

Recommended Spare Parts 5–1

Recommended Spare Parts

RZxx Disk Drive Major FRUs
HDA

Part Number

RZ22
RZ23
RZ23L
RZ24
RZ24L
RZ25
RZ25L
RZ26B
RZ55
RZ56
RZ57
RZ58
RZ73

n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
29-27890-01
29-28158-01
n/a
70-28814-01

Drive Module

Part Number

RZ22
RZ23
RZ23L
RZ24
RZ24L
RZ25
RZ25L
RZ26B
RZ55
RZ56
RZ57
RZ58
RZ73

29-27240-01
29-27240-01
n/a
n/a
n/a
n/a
n/a
n/a
29-27347-01
29-27889-01
29-28159-01
n/a
54-19110-011
54-19131-012

1 Part number accomodates single ended.
2 Part number accomodates differential.

5–2 Recommended Spare Parts