2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
68
2.1.1.1.2 A11/A11 Cable Test
1 Use a DMM to measure the voltage from A11TP5 to
A11TPs 6, 9, or 12.
2 Verify that the voltage is between 32 and 38 Vdc (45 and 51 Vdc for Opt.
048) with no more than 1 Vrms ripple.
QUESTION: Does the measured voltage meet specifications?
If Yes: Go to, 2.1.1.1.3.
If No: The fault is at either A11 or assembly 05071-60253 or both.
Remove power, replace A11, assembly 05071-60253 or both, and
retest.
2.1.1.1.3 A11/A11-A1 Cables Test
The fault here is probably within A11 (CR14), or the A11-to-A1
cable
(05071-60253), or the A12 module cable.
1 Use a DMM to measure the voltage across A1C3.
2 Verify that the voltage present is between 32 and 38 Vdc (45 and 51 Vdc for
Opt. 048) with no more than 1 Vrms ripple.
QUESTION: Does the measured voltage meet specifications?
If Yes: Remove power, replace A12, and retest.
If No: Remove power, replace A11 or cable 05071-60253, or both
and retest.
2.1.1.1.4 A1CR3 Bridge Rectifier Test
1 Use a DMM to measure the ac voltage across the ac input at A1CR3.
2 Verify that the voltage is at least 25 Vrms (33 Vrms for Opt. 048).
QUESTION: Does the measured voltage meet specifications?
If Yes: Remove power, replace CR3 (or A1), and retest.
If No: Remove power, ensure that F1 line fuse is not open
then, replace T1 or LF1, or both, and retest.
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