Super Pacman PCB Test Mode

troxel

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Donor 7 years: 2015-2021
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I have a PCB that I made a quick adapter to see if the game is working. I basically did these two connectors:

CONN 3 CONN 1
-------------------------------------
1 GND 1 SHIELD
2 GND 2 SYNC
3 GND 3 SYNC
4 - SENSE 4 KEY
5 +12V 5 GND
6 KEY 6 VID BL
7 +5V 7 GND
8 8 VID GN
9 +5V 9 GND
10 +5V 10 VID RED
11 GND

Game boots to self mode test and shows that ram/rom is OK along with a few other listings. How do I get to the game? There is no service switch and no other pins are connected.


Thanks,
Theron
 
Sounds like you have the service switch grounded. Recheck your connections. Pin 6 on CPU board is service.

CPU Board
---------

J1-2 Speaker Ground
J1-3 Speaker

J2-1 Joystick Down (Player 1)
J2-2 Joystick Left (Player 1)
J2-3 Joystick Up (Player 1)
J2-4 Joystick Right (Player 1)
J2-8 Coin
J2-10 Player 2 Start
J2-11 Player 1 Start
J2-13 Player 1 Fast
J2-15 Ground - looped over to J3-3

J3-1 Ground
J3-2 Control Ground (this was spare so I used it)
J3-3 Ground - looped over to J2-15
J3-4 -5V
J3-5 +12V
J3-7 +5V

Video Board
-----------

J1-1 Coin Ground (this was spare so I used it)
J1-2 Composite Sync (-)
J1-6 Blue
J1-8 Green
J1-10 Red
J1-11 Video Ground
 
CPU Board
---------

J1-2 Speaker Ground
J1-3 Speaker

To avoid confusion, it should be labeled as this:

J1-2 Speaker -
J1-3 Speaker +

Don't ground J1-2 or your toast the audio amp chip. J1-2 goes to one side of the speaker and J1-3 goes to the other.

NEITHER go to ground. If one side is connected to ground the amp chip will get hot enough to remove skin when touched.
 
Thanks, guys. I am still having problems with this. I don't have anything connected to J1 or J2. I just did the power and video on the game. It boots right to the test screen. What am I missing to get it to boot to the game?

Thanks,
Theron
 
Came back to this problem and still get figure it out. Pin 6, which is the Test switch is not connected to anything and is reading 4.88 Vdc. What else would put the pcb in test mode?
 
Came back to this problem and still get figure it out. Pin 6, which is the Test switch is not connected to anything and is reading 4.88 Vdc. What else would put the pcb in test mode?

Maybe a broken or bad pull up resistor? On that board it will probably be in a resistor pack sip instead of a single resistor. You would have to look at the schematics to see where to look. Im not at home right now, let me see if I can quick search up some schematics.

Man I hate these pdf schematics, they are hard to read. Looks like there is a custom chip @ 4C. Its a 56XX. Clean the legs and reseat that chip and see if it helps. Be careful, the legs on these are fragile.
 
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