Lower Bank Hv Switch Section (5) And Vias To Ground (6) - GE LOGIQ E9 Service Manual

PROPRIETARY TO GE
D 5180483-100, R . 7 LOGIQ E9 P S M
IRECTION EV ROPRIETARY ERVICE ANUAL
7-9-19-7 Visual Inspection of Board (cont'd)
Troubleshooting Step 1 - Upper Bank of HV FET Section (cont'd).
If no Visual Damage is found on Lower Bank of Transmitter Channels
Measure resistance from output of HV feed resistors R19 and R32 to ground.
NOTE: Measured resistance of a good board should be ~ 90 - 110K ohms, with a calibrated ohm meter.
If measured resistance is less than ~ 90 - 110K (typically 5 ohms or less) this is indicative of a transmit
transformer with a primary to secondary short.
Figure 7-195 Lower Bank HV Switch Section (5) and Vias to ground (6)
Measure from these vias to ground (6) to test for possible transmit transformer short on the lower bank.
Chapter 7 Diagnostics/Troubleshooting 7 - 291