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TROUBLESHOOTING
critical. The RPW and WPW procedures are included only for troubleshooting purposes and for the case
of unintentional adjustment.
PLL Adjustment
Use Figure 4-1 for locating test points.
1. Power on the unit with the JMPO jumper in the normal running (R)
position, and allow the power-on self test to finish.
2. Set the JMPO jumper to the test (T) position. This enables the FOC
adjustment mode.
3. After 2 minutes warm up, attatch the frequency counter test leads
to the VCO test-point. The frequency should be 500 KHz +- 5%. If
adjustment is necessary, adjust the variable ca paci tor C 8 for a
frequency of 500 KHz +-.2% (+-1 KHz).
4. Return the JMPO jumper to the original position (R).
5. Verify disc operation.
4-7
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