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|  TM 11-5820-401-34-3/0967-LP-432-3060
4-15. CRYSTAL REFERENCE SYSTEM (CRS) TEST. (CONT)
TEST PROCEDURE
1.
Connect MM-100E attenuated probe A to MK-1978/VRC SPKR jack in MK-1978/VRC AUDIO
square. Connect probe B to MK-1978/VRC GND jack. A 1000-HZ tone will be heard on
MM-100E speaker.
2.
Adjust R-442/VRC VOLUME control for comfortable level.
3.
Raise A3000 tray (1).
4.
Remove A1000 cover(2) and install alinement cover with at least one screw to ensure
good ground.
5.
Ground TP3001 (3) with screwdriver.
6.
Adjust L1502 (4) to get clearest possible 1000-HZ tone from speaker.
7.
Remove ground from TP3001. Tone must not change.
NOTE
If the tone changes to a rushing noise when step 7 is completed, the CRS is defective.
See the troubleshooting section.
Set R-442/VRC MC-TUNE-KC control to 40.00 MHz; then back to 30.00 MHz. Tone must not
8.
change.
4-111
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