Pioneer SA-9100 Protection light Problem
- Thread starter swheim
- Start date
petehall347
the brandy coffee man
post all protect pin voltages .
Pin 1 0 Volts
2 -16.56
3 -25.44
4 -13.02
5 -43.94
6 -62.10
7 -61.10
8 43.34
9 34.27
10 25.13
11 16.25
typo pin 7 pos voltage
petehall347
the brandy coffee man
3 -25.44 is the problem ..this comes from right channel main amp .
its supposed to be 0v
now post voltages for right side main amp board pins .
its supposed to be 0v
now post voltages for right side main amp board pins .
1 24.88
2 0
3 0
4 0
5 .004
6 -43.88
7 0
8 43.24
9 .010
10 0
11 -47.0
12 0
13 .009
14 46.98
petehall347
the brandy coffee man
all those voltages look good so you checked the wrong channel or you got mixed up with pin 1 and 3 on protect board . or they are somehow swapped over .
or schematic is marked wrong ...
check other channel .
start with pin 12 .. if same voltage as pin 3 protect board carry on . if near 0v stop there and we have to figure out whats going on here .
or schematic is marked wrong ...
check other channel .
start with pin 12 .. if same voltage as pin 3 protect board carry on . if near 0v stop there and we have to figure out whats going on here .
petehall347
the brandy coffee man
just been going over the voltages and these cant be right .... protect board ...
5 -43.94
6 -62.10
7 -61.10
8 43.34
max voltages are +- 45v .. i can believe they are mv though .
5 -43.94
6 -62.10
7 -61.10
8 43.34
max voltages are +- 45v .. i can believe they are mv though .
petehall347
the brandy coffee man
12 is AC see what its saying .. expect 7.5v AC
just checking others now
p.s pin 9 being that low says relay is clicked in or bad connection on the board . i would expect a much higher voltage there . it is supposed to be 8v as it happens .
you proved relay is good so i guess its a meter reading error .
just checking others now
p.s pin 9 being that low says relay is clicked in or bad connection on the board . i would expect a much higher voltage there . it is supposed to be 8v as it happens .
you proved relay is good so i guess its a meter reading error .
Pin 12 is 7.80 AC on protect board
petehall347
the brandy coffee man
voltages for bc and e q6 and q7 should get us right on it now .
just in case get voltages each side of r23
just in case get voltages each side of r23
Q6 B .9mv C .6mv E .8 mv Q7 B ,9 mv C.9mv E .9mv
R23 3.5 volt and 34.7 Volt
petehall347
the brandy coffee man
are all those voltages really positive ?
petehall347
the brandy coffee man
anyway . there is a break between q7 collector and the relay . find it .
also see what voltages are at d8 anode and cathode .. cathode AC anode dc
if i go missing and you cant find the suspected break pull q6 out of circuit and see if relay clicks in .. if it does it doesn't mean q6 is bad it just tells another story .
also see what voltages are at d8 anode and cathode .. cathode AC anode dc
if i go missing and you cant find the suspected break pull q6 out of circuit and see if relay clicks in .. if it does it doesn't mean q6 is bad it just tells another story .
petehall347
the brandy coffee man
we could however get real smart here and measure voltage between q7 collector and pin 9 .
petehall347
the brandy coffee man
just a thought i dont suppose you are still jumpering pin 9 to ground ?
Yes, all these voltages are with pin 9 grounded.
All voltages with Pin 9 not grounded
Protect Board P.S Amp
1 .003 1 0 1 25.29
2 -13.10 2 -16.67 2 0
3 0 3 -25.56 3 0
4 0 4 -13.15 4 0
5 .018 5 -44.0 5 0
6 .012 6 -61.23 6 -44.10
7 .013 7 60.43 7 0
8 .013 8 43.59 8 43.70
9 35.83 9 35.74 9 .012
10 .061 10 25.21 10 0
11 35.84 11 16.27 11 -46.26
12 .016 12 -.003
13 -.018
14 46.28
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