WP 11238
FRS 28121

EX PUM Coil Driver Chassis pulled by R. McCarthy for troubleshooting. Differences noted between spare and installed unit:

1. EX unit has new noise monitor board installed, spare unit has original noise monitor board
2. EX unit has ECR E2100204 implemented, spare unit did not

Replaced failed capacitor on EX unit (Channel 2, C24). Capacitor was shorting +18V rail to ground. Ran transfer functions on all channels in both Low Pass and Acquire mode. Using CH1 as a baseline, all channels gave same result. Unit reinstalled.

Spare unit will be modified per ECR 2100204.

PUM EX- S1000343
PUM Spare - S1102649

F. Clara, R. McCarthy