Good evening Forum, I am in pose of 2 stabilock 4031 an exit works very well the second with an error of the modulator fm I cross the cards all ok, the failure is found in the frequency modulator board around the ic pll mc145106fn pllc the problem I do not not the diagrams of this card (461 457 08) after my measurements on the PLL pin 3 (end) 362.545mhz, pin 4 (Oscin) 1.650mhz pin 8 (Detout) not stable voltage varies a lot, SELF CHECK led lights up. If not assard someone who could help me with the documentation thank you. B.ANTONIO
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Here you canfind the manual, hopefully with the needed module: https://elektrotanya.com/schlumberger_stabilock-4031_communication-test-set_sm.pdf/download.html#dl In my case a coil to the capacity diode was broken. So the oscillator frequency could not be trimmed. Also check the SMD elco's. the sealing ist often defective and the acid detroys the PCB
Good evening, Thank you for your answer the capacitors I all replaced, for the service manual I download in another source, the problem in the fm modulator module there is a card that does not correspond with the diagram it is another version, the problem of the failure the pll does not lock the voltage varies not stable. Greeting B.Antonio
Hello, I found the broken coil l6 cut 10uH + GL4 GL5 diode, it is found in the FM-Modulator 217 031s card in the FREQUENCY MODULATOR board in the RX FM point 8 line. the problem is the reference of the coil what type can I use? have a good week-end Antonio
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