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Post by archie123 on Jan 24, 2024 15:48:24 GMT
Hi! My 429 Starlet is almost working after hours of cleaning, lubrication etc.. Now the problem is following: selections works When selection is made, write-in starts to turning and selector pin is hammered. Timimg lamp flashes and then nothing... If I turn scan - switch from oper to scan for a short time, the read - out arm find the record and everything works as should. Also if I turn wobble plate switch manually, everything is working. So, am I right that only problem can be wobble plate switch coil? Or should I start searching the problem somewhere else? All relays are checked and cleaned in ctrl-box, play ctrl relay checked, accumulator etc checked...
Thank You for Your help
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Post by jukenorman on Jan 24, 2024 16:38:48 GMT
Yes, pretty much answered your own question although it also might also be a mechanical issue (it's stuck) or maybe even a broken wire but you're definitely in the right area.
Norman.
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Post by archie123 on Jan 24, 2024 19:27:29 GMT
Wobble plate switch coil checked. 32 ohms. Mechanically works without stucks...Also wobble plate switch.
Wobble plate pins and arm works. Now I`m wondering should wobble plate arm spring be so that switch is in open postition??
Ain`t that a coil job?
I`m thinking if switch is pressed by this arm spring and when selection pins are all played, wobble plate switch arm and spring will close microswitch and magazine and record plate will stop and we are back in home position...
so do we need wobble plate switch coil???....
hmm..maybe I`ll check is there any power coming to coil....
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Post by archie123 on Jan 25, 2024 16:20:31 GMT
Wobble plate switch coil is getting only approx. 10 volts when write-in is done. And after that nothing happens. So could it be problem in STOP or ADR relay?
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Post by jukenorman on Jan 25, 2024 16:58:09 GMT
It's a contact of the stop relay that energises the wobble plate solenoid. That contact could be dirty? You could check the voltage on the DC supply side of the stop relay contact (pink wire). If the DC voltage is maintained there, then that proves it's a contact fault but if it's dropping to 10V, we'll need to scratch our heads a bit more!
Norman.
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Post by archie123 on Jan 25, 2024 18:42:09 GMT
Thank You Norman. Contact checked and cleaned ( 3rd time). Voltage from pink wire approx. 10 volts... Could it be "solenoid" problem (pls see pic) ibb.co/RTzJZnMI`ve never measured these, but I`ll learn  |
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Post by jukenorman on Jan 25, 2024 19:41:40 GMT
First of all, what voltage does the DC supply recover to? Next could you stick a piece of card (or similar) in that stop contact to prevent it sending voltage to the wobble plate solenoid and monitor the voltage at the pink wire when making a selection. That would let us know whether the solenoid or the accumulator rest coil was the problem.
I wasn't sure what you were alluding to in the picture, sometimes I need things spelled out! Is that inside the power supply?
Norman.
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Post by archie123 on Jan 26, 2024 15:44:10 GMT
Voltage is - 10 V. But now I`m confused. No voltage at all even without a card or with. I tried with two voltage meters. But, to wobble plate switch there`s approx 7 volts...I`ll check stop relay once again. Fuses are changed. Could it be earthing problem or power supply / play relay problem... I`d like to get that "problem child" to work |
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Post by jukenorman on Jan 26, 2024 16:34:22 GMT
I think we need to take a step back here and check the power supply. I don't have a wiring diagram for the 429 power supply, the nearest I can manage is a 436 but I'm fairly sure they are the same. There's a 12 pin plug on the power supply and the pink and the purple wires carry the -28VDC (each separately fused). Disconnect all the plugs from the power supply and check the -28V (ie where the pink or purple wire would connect, they are next to each other) with respact to the chassis. Did your manual come with an overall schematic that includes the power supply?
Norman.
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Post by archie123 on Jan 26, 2024 22:07:42 GMT
I think it`s same power supply. On my schema there`s no power supply overall.There`s no power at all. I`ll the take power supply off and check it. Maybe I have to check rectifier first...it`s the original. But looks good. I have to find out how to measure it, or is it better to change it to silicon one?
I`m not giving up. Thank You so much for your help! That jukebox was given me and there has been so many things done wrong. Wobble plate was in wrong position...there was wrong wiring in write-in etc...it`s like building the jukebox from start....but You live You learn...
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Post by jukenorman on Jan 26, 2024 22:26:46 GMT
Of course you're not giving up, long way to go yet! I will PM you the 436 schematic, it should help.
Norman.
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Post by archie123 on Jan 26, 2024 22:59:16 GMT
Thank You Norman!! Let`s get it back to work!
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Post by archie123 on Feb 21, 2024 9:37:10 GMT
Thank You Norman!! Let`s get it back to work! Hello. Back to Rock-Ola...Power supply pink and purple -28V. Update: When connected only 13 V from pink...So rectifier is broken I think? So it`s ok. Stop relay pink continuously 12,5 V? With card on contact 14,5 V... Wobble plate switch coil approx 12,5 V... I`ve cleaned once again all contacts. Now I`m wondering could it be wobble plate switch coil problem or is the voltage too low...?
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Post by jukenorman on Feb 21, 2024 12:29:24 GMT
The voltage is too low at 13V. I'm not clear, is it still low from the power supply when everything is disconnected?
Norman
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Post by archie123 on Feb 25, 2024 8:42:37 GMT
The voltage is too low at 13V. I'm not clear, is it still low from the power supply when everything is disconnected? Norman Still 13 V when everything is disconnected... |
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