Receiver Vcxo Test; Figure 21 Receiver Assembly Test - Philips 50 T Series Service Manual

Receiver VCXO Test

Receiver VCXO Test

4. Switch on the Receiver. The green LED on the Receiver Assembly
should flicker. Check the +5V, -12V and +12V voltages at the marked
capacitors.
Figure 22 Receiver Assembly Test
5. If all voltages are present and the green LED is flickering now test
Receiver VCXO.
6. If all voltages are correct and the green LED is not flickering, replace
the Receiver Assembly. Check for processor part number higher than
or equal to 1821-1141 on the Receiver Assembly. If any voltage is
incorrect replace the flat cable. If the problem is still not solved, replace
Receiver Processor Board (503).
You require a Spectrum Analyzer and Active Probe to carry out this test.
1. Check the Receiver VCXO ouput signal at the transistor amplifier.
Chapter 8 - RF Bench Repair