Lanzar Optidrive 4000D problem

[Custom Chris]

No it looks fine.

 

[Custom Chris]

Edit that:
It looks like there might be a very faint smoke mark coming away from it...

 

[Perry Babin]

If that's the case, I'd suspect that capacitor. Instead of removing the board from the amp to remove the cap, work it back and forth (gently) until it's leads break. With the cap out of the circuit, what do you read across R34?

 

[Custom Chris]

R34 reads 32.9Ohms still with the C34 cap removed.
There is evidence looking at the cap from the under side of it that it has melted. (boiled)

 

[Perry Babin]

If you twist the small transformer, does the resistance go up to ~1000 ohms?

 

[Custom Chris]

No it stays the same...

 

[Perry Babin]

I'm using a different amp as a reference. To make sure that there is no confusion, confirm that the resistor and capacitor in the image are R34 and C37 in your amp.

Also confirm that there are no speaker wires or RCA jacks connected to the amp.

 

[Custom Chris]

The resistor and capacitor you have circled are R70 & C37.

R34 & C34 are next to each other on the other side of the transformer, next to where the winding leg goes into the board.
R34 is a blue 33Ohm resistor
C34 is a 683K63 piece...

R70 reads 940Ohms

Nothing plugged in...

 

[Custom Chris]

Just a thought. Am I still able to plug the power into the amp with cap C34 removed?

 

[Custom Chris]

Lanzar just sent me the schematic for this amp, almost immediately after asking too!
Let me know if anyone wants it

 

[Perry Babin]

Send me a copy please.

babin_perry@yahoo.com

 

[amc32]

I could use a copy, if you don't mind. Please!
abu.zafi@yahoo.com

 

[Custom Chris]

Emails sent!

 

[Perry Babin]

Are you still reading 18 ohms from the input RCA shield to the amp's main ground terminal?

 

[Custom Chris]

No, I don't get any Ohm reading now. (I disconnected the power when I removed C34, should I hook it back up minus cap?)
No beep on continuity check either. It reads 983 (Ohms, right?)

 

[Perry Babin]

What's different (except for the cap you removed) from when you read 18 ohms from the RCA shields to the amp's ground?

Don't reconnect it yet.

 

[Custom Chris]

Nothing, other than there are no power leads hooked up.

 

[Perry Babin]

Were the speaker wires connected when you measured the resistance from the RCA shield to the amp's ground?

What is the resistance from the amp's input RCA shields to the amp's heatsink?

 

[Custom Chris]

No, I disconnected the speaker wires.
I cannot get ANY reading at all from the RCA shields to the heatsink.
I can still get a reading of about 1000 to the negative terminal though.

Would that have anything to do with the big blue resistors between
-SP to heatsink &
-ve to heatsink ?

There is also that resistor that is between the RCA ground and heatsink too...

 

[Custom Chris]

Do you think somebody added these caps in?

An externally hosted image should be here but it was not working when we last tested it.