ORION HCCA 250 POP_TOP

[mike49504]

This amp's power light comes on and i have 10 volts DC on 1 channel and the other channel doesnt produce sound.

Light is on but i dont think the amp is powerd up all the way or something heres what i have on the power supply fets. K1542

Leg1:0
Leg2:13.8
Leg3:0

TL494

1:0
2:0
3:0
4:5.94
5:0
6:0
7:0
8:0.32
9:0
10:0
11:0.32
12:0.32
13:0
14:0
15:0
15:0

Any ideas?

 

[Perry Babin]

Do you read 0 ohms across the thermal switch?

 

[mike49504]

Yes The one on the bottom of the board with 2 leads it measures 0.1 ohms

 

[Perry Babin]

Follow it back to an MPSA06. Give me the voltage on that transistor.

 

[mike49504]

MPSA 56
Leg1:13.94
Leg2:13.94
Leg3:0.65

 

[Perry Babin]

Does this amp have only one opto-coupler?

If so, it's likely switched on with an A06 driving the A56. If there's an A06 near, post the voltage on it.

 

[mike49504]

yeah theres only 1 opto-coupler.

The mpsa06
leg1:0
Leg2:0
Leg3:13.94

 

[Perry Babin]

Are you sure that you have remote voltage?

If so, follow the circuit to make sure that the remote voltage reaches the resistor network near the A06.

 

[mike49504]

Yes i have remote voltage . The voltage reaches the resistor network it connects to pin 8 (13.94 volts)

 

[Perry Babin]

Post the voltages on the resistor network.

Does pin 7 connect to the center leg of the A06?

 

[mike49504]

Yes pin 7 connects to the middle leg of the 06

SMT B 102G

1:0
2:0
3:0
4:0
5:13.94
6:13.94
7:13.94
8:13.94

 

[Perry Babin]

Earlier, you had 0v on pin 2 of the A06. Here you have 13+. Which is correct?

 

[mike49504]

Sorry middle leg of the MPSA06 connects to pin 2 of the resistor pack.

Pin 7 of the resistor pack connects to the 3rd leg of the 06

Voltage on pin 7: 13.94

Voltage on Mpsa06 middle leg:0

 

[Perry Babin]

What's the resistance from the base to the emitter of the A06?

 

[mike49504]

I reflowed the solder On the pins of the A06 and A56 and also the resistor pack . Amp powers up and plays perfectly now. Sorry if i wasted your time .