Re: Power supply question for Gottlieb Countdown


"JimM" <jmegee57@xxxxxxxxxxx> wrote in message
news:1177344193.309680.35350@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I just picked up a 1979 Gottlieb Countdown and one of the problems
with it is the player displays were dim... and the credit/ball in
play display does NOT work at all. I read that they could be
rejuvenated by applying 42 volts to them, but it was suggested to me
to check the power supply first. I put a meter onto the 60 V wire on
the power supply, and I got 18.2 V. Then, I put my meter onto the 42 V
wire, and I got 1.9 V. I did use the DC on the meter. (It is DC
corrrect?) Would this be a capacitor problem? Are the capacitors the
BLUE parts on the board? I have fixed some electronic parts on my
Bally EVEL K. machine, but this is a Gottlieb, and is a bit different
to me. I DO have a wire schematic, and a manual too.

As for the displays... the PLAYER # 1 display does NOT display
correctly. The numbers do not all show up. Meaning.... that the 3
right numbers (1s, 10s, 100s) do NOT display at all. The left 3
(100,000s, 10,000s, 1,000s) show up, but they are garbled. The player
2-4 displays add correctly, but are dim like I said earlier.

I will have a couple of other easy questions, but one at a time works
best for me.

Thanks for the help.

Jim


With voltages like that on your HV supply - the displays would be dim or off
(actually surprised you could see anything). Your HV supply is obviously
bad. But CR12 seems to be working fine as it drops the 60VDC by roughly 18
volts. Need to now narrow this down as to where in your HV supply.

First -- check your HV AC coming in. Meter in AC setting. One lead on
banded end of CR8 and other lead on banded end of CR6 -- what do you get?
Should be roughly 69VAC.

Second -- Check rectified AC. Meter in DC setting. Black lead to power
supply ground. Red lead to banded end of CR7 -- what do you get? Should be
roughly 90VDC.

This will get us cloer to where to start pointing fingers on that supply.
Could be lots of things... bad rectifiers... bad Q2... bad overvoltage
detection circuit (which is overly elaborate).

-- Ed




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