HP 7925D Service Manual page 85

7925
NOTE:
Refer to the following diagram for circuit details.
• Mainframe Assembly Wiring Diagram, fig. 4-23.
Troubleshooting
Check primary fuse F1.
Replace fuse F 1. (Refer to note 3,
fig. 4-23.)
Check for 120 Vac between TB1-1 and
TB1-3 using a battery operated DVM.
Disconnect the ac power and then
check wiring between switch 81, fuse F1,
and TB1. Repair as necessary.
Disconnect the ac power and then
check continuity of wires connecting TB1-1,
TB 1-3, blower motor B1, and starting
capacitor C1.
Repair wiring.
Check starting capacitor C1.
Replace capacitor C1.
(Refer to para. 5-30.)
7311-4C
Replace blower motor B1. (Refer to para.
5-29.1
Figure 4-2. Blower Troubleshooting Flowchart
4-11