Orion hcca 250r

mike49504 · 4th November 2010, 03:22 PM

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 · 4th November 2010, 04:26 PM

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 · 4th November 2010, 05:10 PM

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 · 4th November 2010, 06:23 PM

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 · 4th November 2010, 07:18 PM

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

4th November 2010, 03:22 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Orion hcca 250r 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?

4th November 2010, 04:26 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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4th November 2010, 05:10 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	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

4th November 2010, 06:23 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	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?

4th November 2010, 07:18 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	OK nevermind Replaced the lm837n and amp plays fine out of both channels now.

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