Orion hcca 250r

[mike49504]

I replaced the defective outputs in the left channel of this amp , also replaced the rca jacks due to the shield leg being broken.

I get clean audio out of the right channel and bridged mode works on the amp but if i wire speaker to left channel only theres no output.

Any ideas?

 

[Perry Babin]

Do you have audio on pin 5 of both NJM4562s?

Have you tried running all pots and switches through their entire range to see if the audio for the left channel returns?

 

[mike49504]

On the right channels 4562 i get a nice rounded wave on pin 5

Left channels 4562 on pin 5 i get a square wave

 

[mike49504]

Ok i started to trace the signal and its clipped on pin 10 of 1 of the LM837N's

Heres the voltages on both the LM837N's

First 1

1:-.07
2:-.07
3:-.07
4:14.06
5:-.07
6:-.07
7:-.01
8:-.32
9:-.32
10:-.32
11:-14.11
12:-.08
13:-.08
14:1.2

The other LM837N
1:-12.84
2:-12.84
3:-13.10
4:14.11
5:-6.86
6:-1.03
7:-12.80
8:-5.63
9:-5.65
10:-5.63
11:-14.10
12:-.08
13:-.10
14:5.44

Is this normal or does the IC appear to be defective?

 

[mike49504]

OK nevermind Replaced the lm837n and amp plays fine out of both channels now.