Pioneer SX-838 stays in protection

merlynski said:
My pleasure, I'll be watching for them.
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Thanks for the help merlynski, here's the voltages in VAC with DBT. The DBT dims but comes back up, not bright though. Is that OK? I'll wait to hear back if its a no go to check these VAC without DBT.
AWR-055 Board Pins with DBT:
1. 26.5 VAC
2. 22.3 VAC
3. 22.3 VAC
4. 22.6 VDC
5. -22.6 VDC
6. 0 VDC
7. -22.9 VDC
8. -7.9 VDC
9. -7.9 VDC
10. 15 VDC
11. 18.8 VDC
12. 21.7 VDC
13. 23.9 VDC
14. 8.6 VDC
15. 0 VDC
16. -0 VDC
17. 30 VDC
18. 27.2 VAC
19. 24.5 VAC
21. 3.5 VDC
22. 4.3 VAC
24. 3.8 VAC
 
Pin 18 and 19 are different AC voltages, I was expecting them to be the same, is one of those 1A fuses connected to them on the board blown? I may be being over critical but . . .
 
OK, try it with the 150 and see if the voltages come up some and the bulb dims nicely, you don't need to type in all the voltage again unless there is a radical change, I don't see anything radical.
 
Also measure the voltage across D9, it is a zener diode that is the reference for the regulated voltages, it should be 13vdc, may be low while on DBT. D8 should be 13vdc also but it controls only one supply line.
 
merlynski said:
OK, try it with the 150 and see if the voltages come up some and the bulb dims nicely, you don't need to type in all the voltage again unless there is a radical change, I don't see anything radical.
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on the AC voltages they increased approx. 3-5 volts going to the 150 Watt, with exception to pin 22 which dropped to 0 vac from 4.3vac. On the DC side voltages increased about 10 VDC in some cases.
 
tonefoto said:
on the AC voltages they increased approx. 3-5 volts going to the 150 Watt, with exception to pin 22 which dropped to 0 vac from 4.3vac. On the DC side voltages increased about 10 VDC in some cases.
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I am asking because you said pin 22 dropped to 0 vac from 4.3 vac, when it should have gone up.
 
Just so you know, I am sitting in my easy chair, playing Skyrim, helping you and enjoying some Coors, so my responses may be a bit choppy if I get in a big battle :jump:
 
OK, that's a big problem 'cause pin 22 feeds lightbulbs AND is the AC detect line for the protection circuit. Look closely at the fuse, fuse holder, pcb traces and wiring. When that ac voltage is missing the unit will be in protection all the time!
 
merlynski said:
OK, that's a big problem 'cause pin 22 feeds lightbulbs AND is the AC detect line for the protection circuit. Look closely at the fuse, fuse holder, pcb traces and wiring. When that ac voltage is missing the unit will be in protection all the time!
Click to expand...
This problem has been going south so long I forgot to mention I have no dial lights, just function lamps and stereo lamp, no dial pointer no dial lamps. Will check wiring again
 
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