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Post by bonanaking on Nov 30, 2017 6:20:19 GMT
Greetings all. Ive got an STD3 that has stopped selecting songs. Credit switch does not work, coins do not register. I followed the procedure in Ron's microlog book. Checked the voltages and the -27 was -23.9, the other voltages were within spec. Bouncing between Ron's book and Tony's black and grey book, it was suggested to remove the pricing programmer board and I should have the select lights come on and be able to play a record. I pulled the pricing board and the select lights came on, but not able to select a record and have it play.
Could the low -27 be an issue? Where should i look next? All wiring seems to be in tact, I reseated all the connectors. The dcc board is a -2 edition.
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Post by Ron Rich on Nov 30, 2017 15:58:48 GMT
Positively the -27 volt being -23 is THE issue--read my trouble shooting guide DCC notes--un plug the DTP and DRD and read the voltages--if still wrong, repair the DCC power supply board to specs. I mention in the Guide(Thanks for you purchase !). Ron Rich
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Post by bonanaking on Nov 30, 2017 18:47:09 GMT
I unplugged the DTP and DRD, raised the voltage to 25.5. Plugging in the DRD (after power down) Lowered voltage to about 24.8, the DTP brought it down to the 23.9 Not sure if that means anything really. I'll look into repairing the power supply board. Start with a cap kit?
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Post by Ron Rich on Nov 30, 2017 19:22:57 GMT
By any chance-- have you replaced any of the "selection" lamps--if so, are you 100% sure you used only the correct # type ? Did you read the notes ? Ron Rich
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Post by bonanaking on Nov 30, 2017 20:03:41 GMT
I have not replaced any of the selection lamps recently or ever if I can recall. As far as notes, I read the parts about the lamps and he whole section in the DCC. Am I missing something else?
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Post by Ron Rich on Dec 1, 2017 3:43:03 GMT
Yep--the 2nd paragraph of the DCC notes--
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Post by bonanaking on Dec 5, 2017 6:46:48 GMT
Project update... Ordered a cap kit. waited..... arrived today and installed it this evening. After installation, -27 read 26.5. Since that was in the tolerances, I was satisfied and tried to add credits. That was successful and the everything is now working as it should. Thanks Ron for all the help. I identified the one cap that I felt was the main offender, C09 I think.    |
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Post by Ron Rich on Dec 5, 2017 14:07:28 GMT
Glad you got it-- I would strongly advise that you change all 4 of the diodes on that board that have the brown colored lines on them--use 1N4004's or better, as those, brown colored diodes, tend to fail-shorted ! Ron Rich
P.S.--BTW That board is a -E "edition" that failed to be marked as such--(says "D") -- why did you state it was a "-2" , above in the first post ?
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Post by bonanaking on Dec 5, 2017 16:37:27 GMT
Sorry about the -2 vs -E. I must of incorrectly read the number off the top board. Was not intentional by any means. I’ll order some new diodes and those replaced.
Super happy to have it working again.
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