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Tech: Could it be the Black and Gray Boxes?
Tony M., Ken, and Jim,
Thank you all for your help! I just wanted to post an update on troubleshooting this STD3. (See the "Tech: Seeburg Power Supply Board Revs?" thread.) I took all of your suggestions and went to work. *As my Victory Glass schematics were for the DCC3 or DCC4 (and my STD3 had a DCC1), I contacted Victory Glass. *I asked if they could help me out with getting the 5 pages for the schematics for the DCC1 and of course, they did. *I am one satisfied customer! *Those manuals are better than any pdf I've printed for the vids and pins I work on. I also decided to scoop up a non-working DCC3 off eBay. *The DCC3 was in good shape, so I replaced all the electrolytic caps. *The voltage regulator board had a fried resistor, so I replaced that along with the shorted transistor that was in series with the resistor. The DCC3 fired up and all the voltages were within spec. As soon as I made the first selection, the mech would scan to the next record, pick it up, play it, reject it, then scan to the next record, and do the same thing all over again. *This went on for a while -- I was able to get it to stop by removing the sense (tormat) RCA plug from the DCC to clear the memory. *I punch in a selection, and the whole scan-play-reject cycle started again. *Currently the mech doesn't move any more no matter how many times I power cycle the juke. *The juke looks like it takes the first 2 or 3 selections, then the "press reset" light comes on. I'm thinking that I'm having a black box/gray box problem here... anyone want to concur with this? *I tried Ken's suggestion of resoldering the riser pins on the PCBs in the black and gray boxes, but that didn't change anything. *I'm wondering if I have a bad transistor or diode somewhere. *I thinking that maybe I should buy Tony Miller's black and gray box book to help me troubleshoot. *Before I purchase it, though, I just want to make sure I'm barking up the right tree with the issues I'm having. Any comments are welcome! *Thanks, everyone! Tony G. |
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#2
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Tech: Could it be the Black and Gray Boxes?
I did some digging tonight in the black box by testing the transistors. It looks like it might be (at least) the black box. I found a transistor that is most likely bad but I can't find a cross reference for it. It's Q3723 and is marked FS34518 103 . Anyone know a good sub for this transistor? Thanks! Tony |
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Tech: Could it be the Black and Gray Boxes?
On Fri, 07 Sep 2007 22:53:02 -0400, Tron
wrote: I did some digging tonight in the black box by testing the transistors. It looks like it might be (at least) the black box. I found a transistor that is most likely bad but I can't find a cross reference for it. It's Q3723 and is marked FS34518 103 . Anyone know a good sub for this transistor? Thanks! Tony Subs a 2N3906, 2N3907, 2N3251, 2N5447, HEP715, SK3025, Sk3118, ECG106, NTE159 Cheers, Tony Miller |
#4
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Tech: Could it be the Black and Gray Boxes?
After trading emails with a guy who used to work for Seeburg in those
days about those black & gray``boxes`` i think but not 100% sure that he said if the machine makes any selections `without setting off the reset light then the gray box is ok . I did learn if the selection keyboard can get ``flaky`` so taking that apart to check for broken , bent wrong or dirt can cause miss selection and set off that reset light . Go slow taking that keyboard apart .. its spring loaded . I dont know much at all about that model because i only serviced up 2 of them . It doing all selections in a row sounds like somehow it got `hit up` for a test mode to check the tormat ? and you cleared it all out . I would continue checking all the plug on connectors throughout the machine . Mine had loose fitting pins on the DCC thing . On that transistor you suspect ... look on the circuit board to see if the lead holes are marked . Transistors are marked E , B , C where SCR`s are marked G , K , A or something like that ... those test different than a transistor and can appear bad . Sounds like you have done some nice work there and alot of it . Hope it wakes up for you .. |
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