Pioneer SX-950 wont come out of protection

[zebulon1]

Your getting closer. All read in DC, black probe to chassis ground except pin 12 is AC.
(? = what you are reading)
Pin
1=?
2= Should be around 13v = ?
3=?
4= Ground to chassis
5=?
6=?
7=?
8=?
9=?
10=?
11=?
12 in AC volts = ?

 

[CavScout]

I am confused, there aren't 12 pins on the back of that protection box

 

[petehall347]

is yours awm-062 ?

 

[CavScout]

Yes, the board is an awm-062
I thought the original response to this thread instructed to test the actual protection relay box (the pins on the back).

So I am supposed to test the board.
Ok, I understand now

 

[CavScout]

So am I supposed to use pin 4 as my ground when testing the other 11 pins ?

 

[zebulon1]

To the chassis or pin 4, chassis may reveal more and is safer.

 

[Markoneswift]

Be sure to follow the one hand rule for safety too. Clip your ground to the chassis and test your system using just one hand. If you touch anything funky you will be glad it didn't make a circuit through your body

 

[Markoneswift]

Also if your multimeter probes have a lit of exposed metal on them, consider wrapping a bit of tape round them so only the tip is exposed. This will prevent accidental bridging of points and shorting stuff out - been there, done that....

 

[CavScout]

1) 15.90
2) 13.45
3) 15.11
4) ground
5) 15.89
6) 15.87
7) 15.07
8) 15.09
9) 1.22
10) 1.22
11) 1.22
12) 7.49 AC

 

[petehall347]

are they all positive voltages and in volts ? 1 and 3 should be in mv.s or ideally zero volts .
9 10 11 are way out either way .
if you are lucky it is a bad connection at a fuse holder or old worn out fuse .
power supply needs looking at next ..

 

[CavScout]

Thanks , I didn't realize there would be a negative reading

So I revise my previous readings as 2,9,10,11 are all negative

1) 15.90
2) -13.45
3) 15.11
4) ground
5) 15.89
6) 15.87
7) 15.07
8) 15.09
9) -1.22
10) -1.22
11) -1.22
12) 7.49 AC

 

[petehall347]

power supply has a problem . test fuses first and test fuse holder connections . easily done low ohm setting on meter power off .. across fuse first then the holder . should be near on zero ohms .. lost count of corroded fuse holders i have found . and its only a hobby for me .

 

[CavScout]

As far as I can see on the unit there are 5 fuses on the bottom and one main 6 amp fuse. Are there more ?

 

[petehall347]

quick look at schematic says same .. fuse 2 and 3 are suspect ones . check them all anyway .. apart from obvious main fuse that has to be good

 

[CavScout]

I checked the fuses and they are all good

 

[petehall347]

see if you can get power supply voltages next . awr-101 .all those near fuses are ac . rest dc ..

mostly interested in 6 7 8 9 and 10 right now

 

[CavScout]

6) .018
7) .017
8) 0
9) 0
10) 0

 

[petehall347]

fuse 2 and 3 ac voltages ?
if they are good we need to start looking at q1 collector voltage . its late here so will be gone for a while .. sure others will guide you if watching ..
pin 14 voltage needs checking too now i looked some more ..

 

[CavScout]

I am not sure what you mean by fuse 2 and 3 but for these fuse locations I got these voltages (ac)

24) 8.2v
25) 50.67v
26) 50.63v
27) 21.0v
28) 21.0v

 

[Watthour]

The AC voltage levels appear to be normal. Locate the medium-sized electrolytic capacitors C10 and C11. Check the DC voltages at each of those. Expect about 60VDC across each one.