Excuse me, but why you would want a functional PAL signal generator?
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El 19/02/2025 a las 17:31, Luca via groups.io escribió:
Hi all
Here /g/TekScopes/topic/107425848 H?kan kindly provided the service manual for this signal generator.
I had time to have a look inside and found a shorted cap on the -15V supply (C1200 of A13 board), now the power supply seems to behave a bit better (the 3.6 V rail is still off, at 3.3~ ish Volts)
According to the manual the oven temp normal light should come on but this never happens (this circuit doesn't seem to use the 3.6V rail so I ignored it for now)
The manual says that TP1100 should be around 4.1-4.2 Volts for the "oven temp normal" light to come on but that never happens.. it hovers around 3.5 V and varies a bit. I noticed that R1156 gets really hot (>100 °C) but I don't know if this is a fault or not.
I took the oven apart to check the thermal fuse but it seems ok... so I'm not really sure where to go from here.
I updated the album: /g/TekScopes/album?id=296482
Can I plug the oven in without enclosure for testing?
Disclaimer: I obviously have no idea what I'm doing... there doesn't appear to be any notable occurences of this SG on the net so I will try to find faulty or out of spec parts and hope any of you have a good idea where to start
Thanks
Luca
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