So I'm running through RF's flowchart to troubleshoot this thing and the B+ is still reading too high even though I followed it all the way to the end.
It reads 235 volts DC.
The steps I've done so far:
- Fuse F101 is not blown
- Monitor is not making a ticking noise
- Checked B+ and found it higher than 138 volts
- Replaced C114
- Checked B+ again and it's still too high. Chassis looks good, don't see any bad solder joints or cracks except one which has been repaired
- Measured at the collector of T114 and got the same as B+
- Checked voltage at IC104, pin 1 and got a big fat zero
- Replaced IC105, T108, R198 and tested D129 with basic diode test since I couldn't find one locally and it tested ok so I just put it back in.
That's the end...checked B+ and it's still at 235. Checked voltage at IC104 pin 1 again and still get a big fat zero there.
So....I will break out the schematics and pour over them. But was wondering if anyone has ever seen anything like this before and might have some tips as well.
Thanks!
It reads 235 volts DC.
The steps I've done so far:
- Fuse F101 is not blown
- Monitor is not making a ticking noise
- Checked B+ and found it higher than 138 volts
- Replaced C114
- Checked B+ again and it's still too high. Chassis looks good, don't see any bad solder joints or cracks except one which has been repaired
- Measured at the collector of T114 and got the same as B+
- Checked voltage at IC104, pin 1 and got a big fat zero
- Replaced IC105, T108, R198 and tested D129 with basic diode test since I couldn't find one locally and it tested ok so I just put it back in.
That's the end...checked B+ and it's still at 235. Checked voltage at IC104 pin 1 again and still get a big fat zero there.
So....I will break out the schematics and pour over them. But was wondering if anyone has ever seen anything like this before and might have some tips as well.
Thanks!

