Re: Help request - how to test an HP8350B RF plugin YIG
¿ªÔÆÌåÓýOK going from memory the 83592A RF plug-in is actually a very compact unit with a lot to it The yig signal should be available on the rear of the plug in so I would start there next try the output on the fundamental Yig frequency band ? I assume you have checked the 8350 with another plug in and all is OK as the stand by battery¡¯s are a killer for the 8350 when they age best advice is to remove the stand by battery¡¯s? if they are in a sorry state? then the 8350 frame could suffer from bad joints and connections also the IDC will be at risk of intermittent faults ?I have recently scraped an A version it has repaired 8 other sweepers / plugins ? I love these sweepers but faults can be tricky to sort out Paul ? ? From: [email protected] [mailto:[email protected]] On Behalf Of i.brokos via groups.io ? Hello, I'm trying to repair a 83592A RF plug-in I have bought it from eBay with many components missing, and I have completed it. Furthermore, I have changed the 300uF cap on A8 board, it was in it. ? I looked for a signal in the front output or the AUX output, NO RF power - All Bands. ? From the manual, I have the troubleshooting procedure (see photo) I have measured on A13AI YO BIAS PCB test points (See photo) ? YO Coil Current Source Waveforms in A8TP6 (see photo) is flat/noise ! With another A8 Board from a working plug-in, the YO Coil Current Source Waveforms in A8TP6 is present, but again there is NO RF power - All Bands ? I tried the working plug in with the A8 from the plug in I try to repair (not working plug in) the YO Coil Current Source Waveforms in A8TP6 is present, and the plug in is working!!!! That means that the two A8 boards are working !! ? I can't understand why on the no working plug in the one A8 the YO Coil Current Source Waveforms in A8TP6 is present and in the other doesn't when in the working plug in both A8 YO Coil Current Source Waveforms in A8TP6 is present? ?? ? Furthermore, I can't measure TP "G" ? Can I disconnect the J2 without burning the YO (if it is working!) and take the measurement of TP "G" for -2Vdc? OR it is not necessary the YO is failure ? ? If there is any suggestion on the next steps, it will help JOHN ? ? ? |
Paul Bicknell