For years I had in my collection the bootleg version of this game probably manufactured in Italy. Fortunately I found a cab without the PCB for few euros. I could put the cab in operating condition very soon thanks to my bootleg and then I had a bit o time to find the original board (thanks to Robotype…).
Here the PCB now is in the cabinet.
This is the connector between the main board and the sound board.
Here is the cab.
No video and a whistle
While I was playing the screen became black and I can hear only a whistle. Checking the voltage I could see I had 2.4V instead of 5V. 5V are generated by a power supply on the left of the monitor. It is the same PS generates 73V for the monitor itself. In the beginning I though something went wrong on the PCB. Sometimes old tantalium capacitors are in short circuit; but after a short verification I could see the board was in working conditions. I just plugged the board on my test desk. So the problem is in the power supply.
No video and a whistle (2)
Never seen this PS before and no schematics at all (if someone has these schems, please email me)
I took some pics
I couldn’t understand which kind of active component this PS has. Here the list I could compile.
- Q201 = see pic below
- Q202 = see pic below
- D201 = diodes bridge
- D202 = see pic below
- C201 = ?
- C202 = 1nF
- C203 = 100 uF, 10V
- IC201 = T3 = LM741 see pic below
- R201 = 67K
- R202 = 6K9
- R203 = 3K3
- R204 = 470
- R205 = 49
- R206 = trimmer about 1K5 (used for 5V regulation)
Q201, Q202 and D202 are unknown. Thanks to Andreas I could identify IC201 = LM741
Replacing IC201 nothing changed but sometimes worked for few seconds. Remaking the solderings the PS started to work properly and after some hours working I can consider the problem solved.
Troubleshooting the spinner
If you are troubleshooting the spinner I saved some videos while I was checking my board.
PCB SK2 Troubleshooting (1)
I want 2 boards for each cabinet I have; that’s because in case of problems I can continue to play my games until the main board has been repaired. So I found an original EXIDY CIRCUS board, sound board included. Actually when I tested it I could see garbage on screen but I could insert coins and “play”.
I tested this board on my cabinet:
I pointed out directly to the RAMs and related components. After replacing a couple of RAMS I had this result:
I needed a bit of time (wasting time to replace components into the video section) to understand the problem:
Yes… Cutting all pins I could reach this status:
A good result, but not enough. In fact the game freezes after few frames.
PCB SK2 Troubleshooting (2)
What I know about this problem is that connecting to ground the PIN 1 of the 74H21 in position 15D (signal MVID) I have the game running with a correct attract mode, the spinner works, accepts coins and the game starts. The problem is (obviously) that the “MAN” is missing; in fact that signal manages the jumping man.
So I had a look to the “MAN” circuit but after some evenings replacing components I replaced ALL components but nothing changed….
All IN signals seem to be OK. Now I’m blocked, I can’t solve this problem.