Orion CBT2000.1D

[Hexhclass]

This amp doesn’t produce output.There is no drive signal going the the output FETs.Rail and Reg voltages look ok.There is 5532 op-amp and some transistors for drive circuit but I don’t no how it is supposed to creat the drive siganl.

I see audio on all three op-amp in the pre amp circuit.

Any suggestions?

 

[Hexhclass]

.

 

[Perry Babin]

Do you have audio (or anything like audio) on any terminals of IC4?

DCV directly across D9?

DCV directly across R6(?), number obscured by green capacitor?

 

[Hexhclass]

I have audio on IC4

5.11v across D9

4.53v across R63

 

[Perry Babin]

I think the attached diagram is what you have. I need you to find the equivalent of Q47 on page 6.

 

[Hexhclass]

I did not find any pnp transistor connecting that way

 

[Perry Babin]

Has anyone worked on this amp before you received it?

Isn't your amp basically the same as the audio section of the boss amp?

 

[Hexhclass]

It looks the same but some resistor values different.

Maybe they left that circuit out?

Work had already been done but I think is was a previous repair.

 

[Perry Babin]

Find the 220 ohm resistor that goes to two 10 ohm resistors and then to Q42 and Q43. What is the transistor with its collector connected to the 220 ohm resistor?

 

[Hexhclass]

Only one 220 ohm in that circuit and it is connect to the large resistor in the REG voltage circuit and the other end goes to C1027 transistor emiter.There are no 10 ohm resistors

 

[Perry Babin]

With no references, I don't know what to suggest other than checking each transistor and resistor. If you go through the circuit and mark the diagram I sent with the corresponding parts in your circuit, I'll try to make suggestions.

In other circuits, Q47 switches on and delivers voltage to the rest of the circuit. This is muting in other amps.