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|  TM 11-5820-401-34-3/0967-LP-432-3060
3-15. CRYSTAL REFERENCE SYSTEM (CRS) TEST. (CONT)
Turn AN/URM-103 DEVIATION control clockwise until DEVIATION KHZ meter reads 8 kHz. The
1.
1000-Hz tone will be heard on speaker. If no tone is heard, CRS may be defective. Proceed to
step 2.
Adjust R-442/VRC VOLUME control for comfortable level.
2.
Raise A3000 tray (1).
3.
4.
Remove A1000 cover (2) and install alinement cover with at least one screw to ensure good
ground.
5.
Ground TP3001 (3) with screwdriver.
Adjust L1502 (4) to get clearest possible 1000-HZ tone from speaker.
6.
7.
Remove ground from TP3001. Tone must not change.
NOTE
If the tone heard changes to a rushing noise when step 7 is completed, the CRS is defec-
tive. See the troubleshooting section.
8.
Set R-442/VRC MC-TUNE-KC control to 40.00 MHz; then back to 30.00 MHz. Tone must not
change.
NOTE
If the tone changes after step 8 is completed, the CRS may be defective. See the
troubleshooting section.
3-93
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