Car Amplifier have power but no sound. Please help me

[Hackersingh]

There are 4 output pins per each 14 pin op-amp. You need to post the pin number and the voltage.

In the Right one :
PINS Voltage
1. 0
2. 0
3. 0
4. +16
5. 0
6. 0
7. 0
8. -13.94
9. -3.40
10. 0
11. -15.75
12. 0
13. -3.37
14. -13.95

MIDDLE ONE:
Pins Voltage
1. -14
2. -6.80
3. -13.88
4. -13.88
5. -13.35
6. -10.94
7. -14
8. -13.32
9. -13.32
10. 0
11. -15.75
12. 0
13. -13.33
14. -13.32

LEFT SMALL ONE:
Pins Voltage
1. -13.12
2. -2.48
3. -11.84
4. -15.78
5. -13.88
6. -13.15
7. -11.95
8. 0

 

[Hackersingh]

Is that an old photo? I see the fixative on some components.

yes,it is an old photo.

 

[Hackersingh]

In the Right one Output Voltage:
PINS Voltage
1. 0
7. 0
8. -13.94
14. -13.95

MIDDLE ONE Output V:
Pins Voltage
1. -14
7. -14
8. -13.32
14. -13.32

LEFT SMALL ONE Output V:
Pins Voltage
1. -13.12
7. -11.95

 

[Perry Babin]

You don't have positive supply voltage on two of the ICs. Why?

 

[Hackersingh]

You don't have positive supply voltage on two of the ICs. Why?

May be i am checking the voltage with one terminal grounded and second terminal on pins with multimeter.
Tell me if i am wrong.

 

[Perry Babin]

With a meter, black on pin 11, red on pin 4, what is the DC voltage?

 

[Hackersingh]

With a meter, black on pin 11, red on pin 4, what is the DC voltage?

30V In the right side and 0.25V in the Middle one and 0.25V in the left side's small op-amp.

 

[Perry Babin]

If you got that wrong, all the rest are unreliable. Place the black meter probe on one of the non-bridging speaker terminals and repost the voltages. Do it on the 14 pin op-amp on the right of the photo first. Copy and paste:


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:

 

[Hackersingh]

the non-bridging speaker terminals

Please can you clarify what do you mean by non-bridging speaker terminals by using or marking in this photo.

 

[Perry Babin]

For bridgeable amplifiers, half of the terminals will be used for bridging. The rest (non-bridging) will all be connected directly together and to the secondary ground. That's what you need for the reference (black probe).

 

[Hackersingh]

Ok . You mean that the middle one of the terminals of the amplifier like this

 

[Hackersingh]

Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: +16
Pin 5: 0
Pin 6: 0
Pin 7: 0
Pin 8: -13.94
Pin 9: -3.40
Pin 10: 0
Pin 11: -15.75
Pin 12: 0
Pin 13: -3.37
Pin 14: -13.45

 

[Perry Babin]

Are all of the potentiometers in good working order?

Is the preamp board plugged in?