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Old 22nd March 2010, 07:05 PM   #1
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Question Soundstream MC245 . . . Again

Hello,

I have been through the other threads, they have no pictures or info I need.

I got this one with the front/rear fet's removed.
I know they are Tip 102/107's, but I don't know which goes to which side on the board.
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I am also replacing the caps, panasonic?
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Thanks!

paul
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Old 22nd March 2010, 07:36 PM   #2
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The outputs aren't FETs in this amp. If they're TIP102s/107s, they darlington bipolar transistors.

If the emitters are tied together (via the emitter resistors), the collector of the TIP102 will go to the positive rail. You can either trace it to the positive terminal of the rail cap or to the rectifier.

I've had good luck with the FC series Panasonic caps (Digi-Key).
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Old 22nd March 2010, 07:42 PM   #3
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Thank you!
Will order parts for this and jbl now...
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Old 29th March 2010, 08:41 PM   #4
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Thumbs up This one was easy!

Fixed
I replaced all the caps I could get panasonic replacements for, and put new tip 102/107's in it.
Also replaced the internal wires and leds between the rca's.
The switches needed some messaging, but all the channels work!
This one is going in my Thunderbird...

paul
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Old 29th March 2010, 10:39 PM   #5
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massaging, dang it .
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Old 1st April 2010, 09:55 PM   #6
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Question Spoke too soon...

I got it installed in-car, and it blows fuse for 4th channel as soon as powered-up with/without speaker connected. Wiring in car good speaker good. Showing 22vdc across fuse terminal in the car.

on bench, testing just 4th channel with generator, it works/doesn't blow.
Have I got devices in there backwards?
Ideas?
I'm pulling it apart now...
Thanks!

paul
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Old 1st April 2010, 10:06 PM   #7
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Default What I thought...

Transistor Case of said channel is shorted to chassis..
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Old 3rd May 2010, 06:03 PM   #8
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Default new problem

Sound is great from this!
Gain adjustment worked for a while, then,
All trim pots for gain suddenly have NO affect on input gain.
The gain seems to be 'stuck' at minimum sensitivity.
Is there any trick to this before I open it up?
Tried massaging switches with no change.
Thanks!

paul
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Old 3rd May 2010, 11:47 PM   #9
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UPDATE
Left channel input no sound right channel input sound comes-out left+right channels...
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Old 9th May 2010, 04:59 PM   #10
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I have audio leaking from a given input into the other three speaker outputs at a reduced volume.

What would cause this?
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