HP 8753D Option 011 Service Manual page 159

Verify the A15 Preregulator
Verify that the 15 preregulator is supplying the correct voltages to the 8 post regulator.
Use a voltmeter with a small probe to measure the output voltages of 15W1's plug. Refer to
Table 5-2 and Figure 5-6.
If the voltages are not within tolerance, replace 15.
If the voltages are within tolerance, 15 is veri ed. Continue to \Check for a Faulty
ssembly."
Pin A15W1P1 (Disconnected)
Voltages
,2 + 25 to + 00
3,4 +22.4 to +33.6
5,6 22.4 to
7 N/C
8 +9.4 to + 4
9, 0 9.4 to
+32 to +48
2 N/C
NOTE: The +5VD supply must be loaded by one or more assemblies at all times, or the other voltages will not be
correct. It connects to motherboard connector A 7J3 Pin 4.
Figure PLUG5 here.
5-8 Power Supply Troubleshooting
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Table 5-2. Output Voltages
A8J2 (Connected) Voltages
+68 to +72
+ 7.0 to + 8.4
33.6 7.0 to
+7.4 to +8.0
4 6.7 to
+24.6 to +26.6
Figure 5-6. A15W1 Plug etail
A15 Preregulator Mnemonic
8.4
N/C
7.3
N/C
+70 V
+ 8 V
8 V
N/C
+8 V
8 V
+25 V
N/C
RAFT
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