Post by Brian-E on Jun 6, 2024 13:50:18 GMT
A little more advice please, if anyone can help?
As stated elsewhere, I have been working on the above machine for a few months now, and have reached a stage where it actually picks up a record and plays it, but in the process I believe I have (stupidly) damaged something.
By way of explanation:-
The Dual Pricing System allows for Singles to be priced at 10c, and EPs to be priced at 15c per play.
Dropping a Nickel into the coin slot should light the lower '5c Credit - Add more Coins' lamp.
Adding another Nickel (or dropping in a Dime instead), should switch over to the 'Make 10c Selection Only' lamp.
Dropping a Quarter in (instead), should allow three 10c Singles, or two 15c EPs to be played.
So, the 'Make Any Selection' lamp should light, and the others should go out.
With me so far? ...
When I started working on the machine, all three coin slots seemed to register the same credit of 25c, so only the top 'Make Any Selection' lamp worked.
I discovered that someone had wired all three coin switches together. So... having rewired these (bottom left of the circuit diagram below), so that Nickels, Dimes, and Quarters actually registered the correct value, only the lower ('5c Credit - Add more Coins') of the other two lamps (just below centre right of the diagram) seemed to work properly.
i.postimg.cc/ZYXn5Bf3/Dual-Pricing-System-Circuit.jpg
Not content to 'leave well alone', and ignoring the old adage 'if it ain't broke - don't fix it', I decided to remove the bottom and middle bulbs from their respective holders, and check the voltage. I was getting around 6.3Vac in each of the bulb holders, which seemed to tie-in with the labeling on the bulb holder '#55 lamp only'. A #55 lamp is 7Vac.
However, whilst replacing these (with the power on), they both glowed incredibly brightly for half a second, then failed (unsurprisingly).
I later discovered that there was about 26Vac between the 'case' of each bulb holder and the chassis. I must have accidentally touched the bulb across the outside of the bulb holder and the chassis (moral - never replace bulbs with the power on). In my defense, 6.3Vac isn't the sort of voltages that most people are likely to be wary of, so I admit I was less than cautious
.
Anyway... having bought new bulbs (from Jukebox Revival), neither of the lower two light at all now
. I now have zero volts at those two lamp holders - But the top one ('Make Any Selection') still works fine, so it can't be a power supply problem (can it?).
I can't see any fuses in the circuit diagram associated with the power feed to these lamps, and I can't fathom the circuit itself (as the wiring goes through a number of rotary switches and relays) to work out where the power is not getting through.
Can anyone suggest any ideas as to where my problem might be? (apart from 'leave the darn thing alone, of course
).
Many Thanks in anticipation.
Brian E.
As stated elsewhere, I have been working on the above machine for a few months now, and have reached a stage where it actually picks up a record and plays it, but in the process I believe I have (stupidly) damaged something.
By way of explanation:-
The Dual Pricing System allows for Singles to be priced at 10c, and EPs to be priced at 15c per play.
Dropping a Nickel into the coin slot should light the lower '5c Credit - Add more Coins' lamp.
Adding another Nickel (or dropping in a Dime instead), should switch over to the 'Make 10c Selection Only' lamp.
Dropping a Quarter in (instead), should allow three 10c Singles, or two 15c EPs to be played.
So, the 'Make Any Selection' lamp should light, and the others should go out.
With me so far? ...
When I started working on the machine, all three coin slots seemed to register the same credit of 25c, so only the top 'Make Any Selection' lamp worked.
I discovered that someone had wired all three coin switches together. So... having rewired these (bottom left of the circuit diagram below), so that Nickels, Dimes, and Quarters actually registered the correct value, only the lower ('5c Credit - Add more Coins') of the other two lamps (just below centre right of the diagram) seemed to work properly.
i.postimg.cc/ZYXn5Bf3/Dual-Pricing-System-Circuit.jpg
Not content to 'leave well alone', and ignoring the old adage 'if it ain't broke - don't fix it', I decided to remove the bottom and middle bulbs from their respective holders, and check the voltage. I was getting around 6.3Vac in each of the bulb holders, which seemed to tie-in with the labeling on the bulb holder '#55 lamp only'. A #55 lamp is 7Vac.
However, whilst replacing these (with the power on), they both glowed incredibly brightly for half a second, then failed (unsurprisingly).
I later discovered that there was about 26Vac between the 'case' of each bulb holder and the chassis. I must have accidentally touched the bulb across the outside of the bulb holder and the chassis (moral - never replace bulbs with the power on). In my defense, 6.3Vac isn't the sort of voltages that most people are likely to be wary of, so I admit I was less than cautious
. Anyway... having bought new bulbs (from Jukebox Revival), neither of the lower two light at all now
. I now have zero volts at those two lamp holders - But the top one ('Make Any Selection') still works fine, so it can't be a power supply problem (can it?). I can't see any fuses in the circuit diagram associated with the power feed to these lamps, and I can't fathom the circuit itself (as the wiring goes through a number of rotary switches and relays) to work out where the power is not getting through.
Can anyone suggest any ideas as to where my problem might be? (apart from 'leave the darn thing alone, of course
). Many Thanks in anticipation.
Brian E.
. 