GE 5205000, Service Manual

Page: 303 / 808

GE
D
IRECTION
5535208-100, R
EV
. 2 LOGIQ E9 S
ERVICE
M
ANUAL
Chapter 7 Diagnostics/Troubleshooting 7 - 55
7-5-8-8 Analog Receive (cont’d)
Tests the signal path from the GFI to the backplane (GTX) to the GRX.
Name: DC Offset Calibration Utility
NOTE: The DC Offset Calibration Utility diagnostic MUST be run when the DRX boards are replaced
or moved. See:
Section 6-6 "DC Offset Calibration" on page 6-20 .
Description: Measures and corrects for the DC offset of the ADCs on the DRX.
Run Time: 00:02
Run this utility to calibrate the correct DC offset after replacing or moving DRX boards. A popup
message alerts the user to run this utility after DRX boards have been replaced or moved.
Name: Analog RX Test (High Gain)
Description: Signal path test of the GRX boards with a TGC set to high (peak) gain. Failures could be
channel in DRX boards, Nathan, GRX to DRX communication.
Run Time: 00:02
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
NOTE: A block of 8 dead channels indicates a failed DRX board.
2.) Replace any failed boards.
3.) Replace GRX boards (these cannot be swapped as one is 64 channel and one is 128 channel).
Name: Analog RX Test (Medium Gain)
Description: Signal path test of the GRX boards with a TGC set to medium gain.
Run Time: 00:02
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
NOTE: A block of 8 dead channels indicates a failed DRX board.
2.) Replace any failed boards.
3.) Replace GRX boards (these cannot be swapped as one is 64 channel and one is 128 channel).