XTant X603

Dr Zeus · 01:26 AM

Ive got this amp up on the bench which has probably seen better days. The owner insisted on keping the cover to this amp while I try to fix it - because he was going to clean it up and get it powder coated if I can fix this for him. This poor amp has definately been through some physical battles and has likely suffered death from foreign debris.

Lucky for this amp, none of the fets are measuring shorted so i believe this will be a low-cost but time consuming affair.

I believe CT for this amp is at one end of the large resistor-pack "attenuation" module - however, only one of the two resistors is of good reference (1vDC referencing amp ground) because the other is measuring 9vDC referenceing amp ground. The amp powers up with +-41.5vDC on the sub/mono rail and +-29.5vDC on the other channels. Opsamps are getting +16.5v and -18.25v...

The + Left Front and + Left Passive terminals have -8vDC on them, and + Mono speaker terminal has +8vDC on it.

Using my eagle eye, I found several visually defective areas on the board: R183 missing (10 ohm?), R132 (100 ohm), R176 (1k ohm), and Q78/Q79 (1BZ?):

Dr Zeus · 4th May 2011, 01:18 AM

The 3 and 3 resistors up and down fro mthis blue pot are measuring out of tollerance:

Perry Babin · 4th May 2011, 02:50 AM

Yes. The resistor is 10 ohms. The transistors are marked 1B 2.

ALPINE AJ · 23rd May 2011, 06:43 AM

ALPINE AJ · 23rd May 2011, 08:12 AM

XTant X603

Amplifier because the impact had asked you

Will the picture on the black circle with part of the value of that? ? ?

Thank you

4th May 2011, 01:11 AM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	XTant X603 Ive got this amp up on the bench which has probably seen better days. The owner insisted on keping the cover to this amp while I try to fix it - because he was going to clean it up and get it powder coated if I can fix this for him. This poor amp has definately been through some physical battles and has likely suffered death from foreign debris. Lucky for this amp, none of the fets are measuring shorted so i believe this will be a low-cost but time consuming affair. I believe CT for this amp is at one end of the large resistor-pack "attenuation" module - however, only one of the two resistors is of good reference (1vDC referencing amp ground) because the other is measuring 9vDC referenceing amp ground. The amp powers up with +-41.5vDC on the sub/mono rail and +-29.5vDC on the other channels. Opsamps are getting +16.5v and -18.25v... The + Left Front and + Left Passive terminals have -8vDC on them, and + Mono speaker terminal has +8vDC on it. Using my eagle eye, I found several visually defective areas on the board: R183 missing (10 ohm?), R132 (100 ohm), R176 (1k ohm), and Q78/Q79 (1BZ?): Last edited by Dr Zeus; 4th May 2011 at 01:26 AM.

4th May 2011, 02:50 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. The resistor is 10 ohms. The transistors are marked 1B 2. __________________ 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 May 2011, 01:18 AM	#2
Dr Zeus diyAudio Member Join Date: Oct 2010	The 3 and 3 resistors up and down fro mthis blue pot are measuring out of tollerance:

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