PHASE LOCK INFORMATION
The lock light starts to blink on the front panel...
The lock light monitors the most critical
circuits of the unit. Check the unit in the following order:
1. Make sure the lock knob is fully
ccw and the variable gen is off.
2. Remove the case and observe the high loop and low loop
LED's on the modules. If only the low loop LED
is lit, the problem is in the low loop. If the high loop LED is lit, the problem could be in the high loop, Dual VCO, Hi/Lo Filter,
Low Pass Filter, or SMB RF connections that connect the modules together. Otherwise, the high loop is not calibrated correctly. If
both LED's are lit, a time piece failure has most likely occured (TCXO or related area).
The high loop
circuit which includes the VCO, Hi/Lo filter and Low pass filter, is a very delicate circuit. At times it could function intermittently
-- it might work for 30 minutes, lose phase lock, then work again. It is possible that it loses lock at one end of the spectrum only.
If you are unable to calibrate the high loop to where it will stay locked all the time, it may be time to get your service monitor
checked. Very few techs survive their first high loop/VCO experience. Of course this depends on your level, you make the call. Go
to the Quick Cal section on this page to check out the High loop circuit.
If you find the low loop
light on, you can just send in the module for repair