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 Formatted Capacity . . . . . . . . . . .	1-2	
1.2 Service Strategy . . . . . . . . . . . . . .	1-2	
1.3 Associated Documents . . . . . . . . . .	1-2

2 Configurations	

2.1 RZ22 and RZ23 Disk Drive	
Configuration . . . . . . . . . . . . . . . .	2-2	
2.2 RZ23L Disk Drive . . . . . . . . . . . . .	2-4	
2.3 RZ24 Disk Drive . . . . . . . . . . . . . .	2-5	
2.4 RZ24L Disk Drive . . . . . . . . . . . . .	2-6	
2.5 RZ25 Disk Drive . . . . . . . . . . . . . .	2-7	
2.6 RZ25L Disk Drive . . . . . . . . . . . . .	2-9	
2.7 RZ26B Disk Drive . . . . . . . . . . . . .	2-12	
2.8 RZ55, RZ56, RZ57, and RZ58 Disk	
Drives . . . . . . . . . . . . . . . . . . . . .	2-14	
2.9 RZ73 Disk Drive . . . . . . . . . . . . . .	2-16

3 Troubleshooting

4 FRU Procedures	

4.1 Service Strategy . . . . . . . . . . . . . .	4-1	
4.2 Removing and Replacing RZ22 and	
RZ23 FRUs . . . . . . . . . . . . . . . . .	4-2	
4.3 Replacing RZ23L, RZ24, RZ24L,	
RZ25, RZ25L, and RZ26B FRUs . . .	4-4	
4.4 Removing and Replacing RZ55	
FRUs . . . . . . . . . . . . . . . . . . . . .	4-5	
4.5 Removing and Replacing RZ56,	
RZ57, and RZ58 FRUs . . . . . . . . . .	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	

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	

2-7	RZ26B Drive Module	
Layout . . . . . . . . . . . . . . . . . .	2-12	

2-8	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	

4-2	RZ55 Drive Bezel Removal . . . .	4-6	

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

iv

	

4-7	Disconnecting the RZ73 Flex	
Circuit . . . . . . . . . . . . . . . . . .	4-13

Tables	

2-1	RZ22 and RZ23 Jumpers . . . . .	2-3	

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	

2-9	RZ73 SCSI ID Selection . . . . . .	2-17

v

	

1	

------------------------------------------------------------


Introduction

The RZ22, RZ23, RZ23L, RZ24, RZ24L, RZ25, RZ25L,	
and RZ26B hard disk drives are half-height, high-	
density, 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	5.25-Inch Drives	

------------------------------------------------------------

RZ22	
RZ23	
RZ23L	
RZ24	
RZ24L	
RZ25	
RZ25L	
RZ26B
52Mb	
104Mb	
121Mb	
209Mb	
245Mb	
426Mb	
535Mb	
1.05Gb
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

	

2-2 Configurations

	

Configurations	
2.1 RZ22 and RZ23 Disk Drive Configuration

Table 2-1 RZ22 and RZ23 Jumpers	

------------------------------------------------------------

SCSI ID	E1	E2	E3	E4	

------------------------------------------------------------

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	

E5
1 
is Out	E6
1 
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

	

Table 2-2 RZ23L Jumpers	

------------------------------------------------------------

SCSI ID	E1	E2	E3	

------------------------------------------------------------

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

	

Table 2-3 RZ24 Jumpers	

------------------------------------------------------------

SCSI ID	E1	E2	E3	

------------------------------------------------------------

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

	

Table 2-4 RZ24L Jumpers	

------------------------------------------------------------

SCSI ID	A2	A1	A0	

------------------------------------------------------------

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

	

Configurations 2-7

	

Configurations	
2.5 RZ25 Disk Drive

Table 2-5 RZ25 Jumpers (J5 and J6)	

------------------------------------------------------------

SCSI ID (J5)	A
2	
A
1	
A
0	

------------------------------------------------------------

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	

------------------------------------------------------------

J6	Jumper 2	

------------------------------------------------------------

Out	Spin-up on power-up.	

In	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

	

Configurations 2-9

	

Configurations	
2.6 RZ25L Disk Drive

Table 2-6 RZ25L Jumpers (J2, J5, and J6)	

------------------------------------------------------------

J2
1
Setting	Description	

------------------------------------------------------------

RES

Off

------------------------------------------------------------

/On	Reserved.	

DS ME	

Off

------------------------------------------------------------

Off

------------------------------------------------------------

Spin-up on power-up.	

Off On	Spin-up on SCSI command.	

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

On On	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

Off

------------------------------------------------------------

/On	Reserved.	

TP TP	

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

On

------------------------------------------------------------

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)	

------------------------------------------------------------

J2
1
Setting	Description	

------------------------------------------------------------

Off On	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.	

On On

------------------------------------------------------------

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 & J6
2	
SCSI ID	A
0	
A
1	
A
2	

------------------------------------------------------------

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

	

2-12 Configurations

	

Configurations	
2.7 RZ26B Disk Drive

Table 2-7 RZ26B Jumpers	

------------------------------------------------------------

SCSI ID (J4)	12	11	10	

------------------------------------------------------------

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	


------------------------------------------------------------

J4	Jumper 5	

------------------------------------------------------------

Out	Spin-up on SCSI command.	

In	Spin-up on power-up.	


------------------------------------------------------------

Jumper	Position Description	

------------------------------------------------------------

J6(pins 1-2)	In	Power to SCSI Busterm	
Power.	

J2(pins 1-2)	In	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
	

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	3	2	1	

------------------------------------------------------------

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

	

2-16 Configurations

	

Configurations	
2.9 RZ73 Disk Drive

Table 2-9 RZ73 SCSI ID Selection	

------------------------------------------------------------

SCSI ID	Switch Positions
1	

1	2	3	

------------------------------------------------------------

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	

------------------------------------------------------------

Jumper 13 and 14	

------------------------------------------------------------

Out	Spin-up on power-up.	

In	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

	

(continued on next page)

3-2 Troubleshooting

	

Troubleshooting

Figure 3-1 (Cont.) RZxx Troubleshooting	
Flowcharts

	

(continued on next page)

Troubleshooting 3-3

	

Troubleshooting

Figure 3-1 (Cont.) RZxx Troubleshooting	
Flowcharts

	

(continued on next page)

3-4 Troubleshooting

	

Troubleshooting

Figure 3-1 (Cont.) RZxx Troubleshooting	
Flowcharts

	

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

	

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

	

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

	

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

	

To remove the module, follow these steps:	

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

	

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

	

4-12 FRU Procedures

	

FRU Procedures	
4.6 Removing and Replacing RZ73 FRUs

Figure 4-7 Disconnecting the RZ73 Flex Circuit

	

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
54-19110-01
1	
54-19131-01
2	

------------------------------------------------------------

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

5-2 Recommended Spare Parts