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Post by mastertech on Jan 29, 2014 21:26:17 GMT -5
The amps should be marked on the body of the fuse. If it is not then I can look it up. Let me know when you have the board out and before you change that fuse. I have a few parts I want you to test that should be easy to get at after it is removed. So let me now when it is out.
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nawaz
Junior Member
Posts: 35 
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Post by nawaz on Jan 29, 2014 22:30:53 GMT -5
I now have access to the amp board. Fuse does not have amps marks. The only mark on the fuse is F riding on an enlarged L followed by 1 (LF 1 with F riding on the bottom line of L). This is true for both the fuses. Let me know what else needs to be measured/tested.
A big thank you for guiding me through troubleshooting so far.
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Post by mastertech on Jan 30, 2014 14:20:03 GMT -5
Ok. The amp rating of P5003 is 1 amp. Other parts to test are; Q5705, Q5706, R5705, R5706, D5717. And you are welcome.  |
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 30, 2014 16:15:36 GMT -5
Located Q5705, it is short on all 3 legs, tested with DMM on diode scale. (toasted ?)
Q5706, R5705, R5706 and D5717 are not located. May I ask for diagram to help me locate.
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Post by mastertech on Jan 30, 2014 16:48:46 GMT -5
Should be on the backside of the board from Q5705.  |
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 30, 2014 17:44:28 GMT -5
To gain access to the underneath of the board will require practically totally taking everything apart (a Herculean task for me). I have removed 3 boards to gain access to the top side where Q5705 (and Q5707) resides. Is there any way that these parts can be tested from top?
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Post by mastertech on Jan 30, 2014 17:50:49 GMT -5
How are you going to replace Q5705 without removing the board?
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 30, 2014 18:21:16 GMT -5
I intend to cut the Q5705, leaving the legs soldered. then I will solder the legs of new transistor over the already soldered legs. Not a very elegant solution but hope it will work. May have to provide new heatsink.
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 30, 2014 19:14:15 GMT -5
On a second thought, I think it is better if I undertake this herculean task to be safer and surer about the precision of work. Will start taking things apart soon, stay tuned.
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Post by mastertech on Jan 30, 2014 19:28:51 GMT -5
Ok, let me know.
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 30, 2014 22:21:43 GMT -5
I am having difficulty disconnecting several ribbon cables (CN2003, CN1401, CN2204, CN2203). Can you suggest how to disconnect them safely and reconnect.
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Post by mastertech on Jan 31, 2014 11:53:56 GMT -5
You shouldn't have to disconnect all the cables. Just so you can swing it up to get at the bottom side.
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Post by mastertech on Jan 31, 2014 12:00:51 GMT -5
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nawaz
Junior Member
Posts: 35
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Post by nawaz on Jan 31, 2014 12:33:29 GMT -5
The picture is quite helpful in understanding the construct of chasis, it will let me test the parts under the amp board. Hypothetically speaking if all those parts are OK, I still need to replace Q5705 and blown out fuse and I still need to take the amplifier board out to have access to the top and bottom surfaces, and it requires to disconnect all the connectors from all the top boards. I have disengaged all other connectors except the ribbon ones, where I am not able to figure out how to disconnect without damaging the cable or connector.
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Post by mastertech on Jan 31, 2014 13:03:24 GMT -5
Is there any way you can take a picture of the connectors that are giving you trouble?
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