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Post by mastertech on Feb 20, 2014 11:33:25 GMT -5
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Post by tokejo on Feb 20, 2014 12:11:51 GMT -5
Quantity Part Number Description
2 2SB1560-ND TRANS PNP AUDIO/GP MT-100 TO-3P
2 2SD2390-ND TRANS NPN AUDIO/GP MT-100 TO-3P
3 1N5226BFSCT-ND DIODE ZENER 3.3V 500MW DO35
4 KSA992FTACT-ND TRANSISTOR PNP 120V 50MA TO-92
2 KSC1845FTACT-ND TRANSISTOR NPN 120V 50MA TO-92
2 47W-1-ND RES 47 OHM 1W 5% AXIAL
6 0.47W-2-ND RES 0.47 OHM 2W 5% AXIAL
2 1.2KQBK-ND RES 1.2K OHM 1/4W 5% AXIAL
2 1N483B-ND DIODE SMALL SIGNAL 80V 0.2A DO35
2 4.7W-1-ND RES 4.7 OHM 1W 5% AXIAL
4 5.6KW-1-ND RES 5.6K OHM 1W 5% AXIAL
3 1N914BCT-ND DIODE SMALL SIG 100V 0.2A DO35
This time I did order some spare parts, hopefully I won't need them for this receiver and they can be used on 1613 #2.
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Post by mastertech on Feb 20, 2014 12:20:05 GMT -5
That looks fine, for now. LOL
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Post by tokejo on Feb 24, 2014 19:22:10 GMT -5
Parts have arrived. Going to try to get to this one by this weekend, but very busy.
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Post by tokejo on Feb 25, 2014 16:19:30 GMT -5
Have some spare time. Going to install the parts that were taken out, put it back in the chassis and then cross my fingers.
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Post by tokejo on Feb 25, 2014 18:01:55 GMT -5
Parts installed. Hesitating to plug it back in, will update with results later tonight.
Fingers still crossed.
(First time I took everything out multiple transistors were cracked, a couple of the diodes were cracked in half before/when I desoldered them and there were at least two scorch marks on the board. Hopefully I avoid that when plugging it in).
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Post by tokejo on Feb 25, 2014 18:48:23 GMT -5
No luck, still powers down. This is the underside of RY601. Pins 2 and 3 are on the primary side. Are those the two that need to be jumpered?  |
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Post by mastertech on Feb 25, 2014 20:02:35 GMT -5
I'm assuming you want to go back to here. But we should of done this before installing new parts. Remove the 2 new outputs you installed first then continue. Answer to your last question is yes. Alrighty then,lol. Go to the SMPS board and locate relay RY601. Determine which 2 pin are for the contacts. Should be the same pins that C601 are attached to. Get a piece of wire and solder those 2 pins closed. Just remember that now when you plug it in, everything will be powered even if it shows off. Always unplug when done testing. Now go back to the amp board and look for the 3 wire connector, CN501. The center wire is ground so I need you to attach your DMM gnd probe to this connection. Make it a good firm connection so you don't have to hold it there and it won't fall off. Set your DMM to DC voltage, plug in receiver and go to where you removed Q5405 and Q5406. Test on the collector pad of each and see if you have your B+ and B-. let me know what you get. |
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Post by mastertech on Feb 25, 2014 20:04:08 GMT -5
Also, after the relay is jumpered and you are plugging it in for the first time, watch for smoke and unplug quickly if there is.
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Post by tokejo on Feb 26, 2014 18:04:05 GMT -5
30 awg too thin?
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Post by mastertech on Feb 26, 2014 18:24:46 GMT -5
Should be fine. The fuse is thinner then that.
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Post by tokejo on Mar 3, 2014 19:48:09 GMT -5
I don't know if this is significant, but I'm glad I did it. Totally missed your note about removing the two new outputs before soldering in the jumper wire, but I haven't installed the part yet.
I swapped in the SMPS board from the other receiver and it still powers on when plugged in, then shuts down before finishing the startup sequence.
Should I still desolder the two outputs and swap back in the jumpered SMPS board?
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Post by mastertech on Mar 3, 2014 20:18:34 GMT -5
Yes, you are going to have to do the same thing nash is doing now to find the problem. Removing those outputs is just s safety thing so you don't blow out your new parts.
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Post by Tokejo1 on Mar 9, 2014 16:32:39 GMT -5
For the life of me I can't find CN501.
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Post by Tokejo1 on Mar 9, 2014 16:38:19 GMT -5
Something I hadn't noticed before, Q5702 is scorched. Next to it C5708 might be bad as well, a hint of bulge and the board around looks like something may have leaked onto it (can't be 100%). J5643 has some soot on it.
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