Rockola 483 selection issue

[kgrant]

I have a 483 and everything was working fine on free play now not been on in a while. When I push selection numbers read then goes blank and nothing plays. I have trouble shot it and also sent price setter board off to be fixed and reinstall with same thing happening. Any ideas what else could cause it. If u scan it moves and shows red light and the selections as they pass but when u put a number in it just sets there

[jukenorman]

Have you checked the 9.6 volts to the profit setter?

Norman.

[kgrant12345]

I have not checked the 9.6 I will I just assumed the red light on the board was on I figured I had power. It will take the selection and nothing happens. I will check voltage coming in and I’ll get back with u. Thanks

[Ron Rich]

FYI-- an LED indicator should NEVER be assumed to signal that a voltage is correct-- it only affirms that there IS, voltage. Ron Rich

[rogerroll]

Happy New Year!!
I’m following this post as I’m having the same issue with my Techna 480. This is what I’ve discovered:
- Powering up does what it should:
- Magazine makes full revolution and stops at home position
- Play counter counts up to 99 (set to free play)
- As magazine turns, selections flash their number
- Making a selection:
- first attempt, digits appear as pressed then go away without selection being played
- further attempt show no digits
Latest test of the Profit Setter 52455-1A (as per the service manual):
- Set DIP switch #3 to ‘on’ and press the red ‘Clear’ button, then press blue ‘Test’ button
- it’s supposed to add then subtract plays until one play remains, but it just recounts up to 99 plays and stays there.

Any ideas? Anyone?
Thanks!

[jukenorman]

Did you check the 9.6 volts going to the profit setter with a voltmeter - at the terminal with the pink wire? This is covered in the manual. If you have done that, try running the profit setter test that you did, but first take it off free play.

Norman.

[rogerroll]

Thanks Norman! I forgot to mention that I did check voltage. My cheap-o multimeter reads 9.7 volts.
I thought setting DIP 3 to on essentially does take it off free mode but I will set all the DIP switches to a standard pricing scheme and try it out.
TBC...

[Ron Rich]

"9.7" on elchipo meter, is not "9.6"? I have had no experience with this system, but have been told that this voltage setting is "VERY critical"---Ron Rich

[jukenorman]

Hi Roger,
9.7 should be fine, it's not that absolutely critical! I think that when the adjustment pot goes flaky, the voltage drifts up to 11 or 12 volts and that's what screws it up.

And yes you are right, I hadn't looked at the manual - D3 dip switch does remove the free play setting! I would be suspicious of the decoder chip IC706 in the first instance. You could look at the profit setter for poor solder joints especially around the diodes that interface to IC706. You could leave it off free play and try to add and subtract plays via the pushbuttons which would be simple tests for the profit setter to see if you get any response.

The decoder chip is obsolete so not the sort of thing you would buy on a whim. If you were competent with a logic probe, you could download the spec. sheet of the decoder (it's a DS8664N) and check the responses. I think you would need the large fold-out schematic which originally came with the manual to identify which switches are which in the matrix. Jukebox Revival in The Netherlands does sell the chip but it's not cheap!

Alternatively you could maybe send it out to get it tested/repaired. The OP here had said he had sent his out but as far I can see, he hasn't told us his location so don't know whether that repair person could be an option for you.

Norman.

[jukenorman]

Another simple test you could try would be operating the selection buttons (which you said worked for the first selection) and reset ie 1-2 reset, 1-3 reset etc etc.

Norman.

[rogerroll]

More test results:
Using a typical pricing scheme, the Add 1 play, Subtract 1 Play, Add 1 Unit all appear to work like they’re supposed to, and the display shows the correct song credits....until...
When I make a selection the numbers appear, the ‘Your Selection’ LED light comes on for a second then goes off, the numbers disappear, but nothing happens and the ‘Plays’ number does not change. I tried a few different DIP switch schemes to no avail.
The keypad ‘reset’ test works fine, including when I select an inappropriate number, e.g. 1-2-9 makes the reset button flash, and I can reset and enter a new number.

I did notice, once I moved the metal cover or shield from the Profit Setter that it’s composed of 3 pc boards, 2 smaller circuit boards “plugged” into the main board. I have ordered a fibreglass scraping tool and will dismantle and clean every contact and plug I see. Fingers crossed.

I’m near Montreal. I know of one guy who services these machines. If all else fails, I’ll try to contact him.

[jukenorman]

Hi Roger,
It does seem like the profit centre is more or less working except for that bit of the test that didn't run correctly. And if the D3 dip switch was dodgy, it might well produce that result? The decoder chip I was suspicious of appears to be OK. The selection buttons interface to the profit setter but the selection gets passed across to the logic p.c. board for storage and execution. Have you run the logic board test?

That arrangement of circuit board plug/sockets in the profit setter is also used in the audio amplifier and I've had quite a number of issues with poor solder connections on the plugs where they are soldered to the boards in amplifiers. So that might be something to check.

Norman.

[rogerroll]

Thanks again, Norman! I’ll try to run that logic board test with the non-freeplay DIP settings. I had run it before and it works as it should. Selections are played, 100, 194, 197, etc.
Then I’ll try to clean up those contacts, solders.
I appreciate your help!

[rogerroll]

Follow up:
No obvious issues (burnt bits, ugly solders) on any boards. I’m now trying to source some IC’s to swap out. I could take the easy route and order a whole Profit Setter but what’s the fun in that!?!
To be continued...

[rogerroll]

Update: IT WORKS!!!
The Profit Setter and the Logic board each have a 16-pin “buffer” chip (MM80C97N) with the same part number. The one on the Logic board had been changed to a Motorola MC14503. I swapped those 2 and then couldn’t even key in the first digit of my selection. I finally found equivalent chips online and placed an order.
Installed on the Logic board, flipped the switch, dancing as we speak!
WooHoooo!