Logiq E9 Transmit And Receive Signal Path Diagnostics - GE LOGIQ E9 Service Manual

D 5180483-100, R
IRECTION
7-9-19

LOGIQ E9 Transmit and Receive Signal Path Diagnostics

Use this to troubleshoot LOGIQ E9 DRX or MRX Boards, GTX Boards and/or Front Planes (Transmit
and Receive Signal Paths), and to identify Transmit and Receive Signal Path problems from other
system problems.
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NOTE: Label the DRX and GTX Boards prior to removal to reflect which slot each board was removed
from. Install the boards back in the original locations throughout the troubleshooting process.
Label the Front Planes prior to removal to reflect which is the upper and which is the lower. Install the
Front Planes back in the original locations throughout the troubleshooting process.
NOTE: GTX "numbers" use 1, 2, 3 and 4 as nomenclature in VPD, but 0 (zero), 1, 2 and 3 are used as
nomenclature in diagnostics. In this Section, 1, 2, 3 and 4 nomenclature is used to identify
board, based on location in the Card Rack. See: Figure 7-181 "Card Rack - GFI Configuration"
on page 7-276, Figure 7-183 "Card Rack - GFI configuration" on page 7-278 or Figure 7-185
"Card Rack - MRX Configuration" on page 7-280.
Topics in this Section:
1.) Transmit Signal Path Description - see:
7-9-19-1 "Transmit Signal Path and Transmit/Receive (T/R) Signal Path" on page 7-276.
2.) Analog Receive Path Description - see:
7-9-19-2 "Analog Receive Signal Path and Analog Rx Path" on page 7-278.
3.) Signal Flow Path for MRX Configuration - see:
7-9-19-3 "Signal Flow Path for MRX Configuration" on page 7-280.
4.) How to read Diagnostic Results on T/R Channel Tests - see:
7-9-19-4 "T/R Channel Diagnostic Results" on page 7-282.
5.) How to read Diagnostic Results on Analog Rx Channel Tests - see:
7-9-19-5 "Analog RX Diagnostic Results" on page 7-283.
6.) Troubleshooting Tips For Suspected GTX Transformer Failure - see:
7-9-19-6 "Troubleshooting Tips for Suspected GTX Transformer Failure" on page 7-284.
7.) Visual Inspection of GTX Damage (what to look for) - see:
7-9-19-7 "Visual Inspection of Board" on page 7-285.
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NOTE: A magnifying glass may be required to view and locate test points and grounds.
PROPRIETARY TO GE
. 7
EV
Troubleshooting Step 1 - Upper Bank of Transmitter Channels - see:
"Troubleshooting Step 1 - Upper Bank of HV FET Section (cont'd)." on page 7-290.
Troubleshooting Step 2 - Upper and Lower Transmit Bank - see:
"Troubleshooting Step 2 - Upper and Lower Transmit Bank" on page 7-292.
Chapter 7 Diagnostics/Troubleshooting
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ERVICE ANUAL
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