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AND DIAGNOSTICS
Information in this chapter applies to the different product versions as follows:
Paragraph No.
Product Version
1 through 4
HP 9153/54A, S/N Prefix 2515A and lower
5 through 10
HP 9153/54A, S/N Prefix 2702A and higher HP 9153/54B, All
Serial Numbers
[1] REPAIR PHILOSOPHY (HP 9153/54A S/N Prefix 2515A and Below)
The 3 1/2-inch disc drive assemblies and the controller PCA are on the exchange program.
The part num-
bers for for the Field Replaceable Units (FRU's) are as follows:
3 1/2-inch
Flexible
Disc
Drive
--
09114-69511
Controller
PCA
(9153A)
--
09153-69502
3 1/2-inch
Winchester
--
09153-69121
Fan
--
09125-68500
Power
Supply
--
09153-67501
[2] PREPARATION
FOR
TROUBLESHOOTING
(HP 9153/54A S/N Prefix
2515A and Below)
The following procedure arranges
the Drive Control PCA
for easy access to test points and jumpers for
troubleshooting.
1. Remove the top cover as described in Chapter 6, subsection [2]
2. All switches are accessible through cutouts in the controller PCA mounting assembly.
[3] POWER SUPPLY ASSEMBLY (HP 9153/54A S/N Prefix 2515A and Below)
Power supply voltages should be checked before any troubleshooting procedures are started.
The following
figure shows the location of power supply voltage test points.
This will aid you in isolating the failure to a
replaceable assembly.
The power supply is not an exchange assembly.
SUPPLY SPECS
HVDC +-5%
J5 Connector Assignments
PIN Æ
FUNCTION
1
+12VDC To Flexible Disc Drive
2
GND
7
3
GND
A
4
+5VD0C
g
5
RESET
6
+5VDC
To Controller PCA
7
HDC
E
8
GND
°
9
GND _ To Winchester Disc Drive
10 +12VDC
To Winchester Disc Drive
motor
Figure 8-1.
Power Supply PCA (09153-67501).
8-1
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