Lucky1
Active member
Hi, I hope someone can help me with my issue... https://youtu.be/iK1bdB5sMYo
I'm new here, well, I've been reading the forum for a while and decided to donate and post.
I bought a Pac-man upright cab with a 60 in 1 jamma board back in Jan '16. I asked the seller for the Pac-man PCB as well. First thing I found out is that the wiring was a TOTAL mess. All the wiring had been cut off and rewired in the same original pac-man 44-pin edge connector to make it fit into a jamma. A nightmare. (The jamma board is powered by a computer-style power supply).
I eventually identified "most" of the wires and installed a new 44-pin edge connector to be able to use the original pcb.
I also bought a Pac-man to jamma adapter to be able to use the 60 in 1 board.
Right now, the joystick and start buttons are working fine and I can play the jamma board without problems. It is set on Free play and powered by the computer power supply. Sound works fine also.
The slam switch, coins, counter, test switch and credit switch are NOT connected to the edge connector. I'm not sure where each goes in the connector. This is more complicated then I thought. (I'm specifying this since it can trigger the watchdog - reset or something else.)
When I first tested the PCB, I checked all the voltages. They are a bit low:
12v --> I have 11.7v
7v --> I have 6.8v
Same readings on the transformer pins and after the fuse block. I changed the fuses but NOT the block since the voltages are the same. But I have a spare one that I can install.
I have read a lot of webpages so far and I'm stuck.
On the PCB:
-Replaced D44VM4 at Q6
-Replaced the 4 pin adjustable voltage regulator at IR1.
-Replaced 6 Rom set
-Inspected all the board for broken traces and rusted legs.
-I have checked many other voltages on the board.
What I have right now is a screen full of green "F" and it seems that the watchdog is resetting the board. We can see a bell appear at some point but that is the only real sprite I can get.
youtube video: https://youtu.be/iK1bdB5sMYo
Any help will be appreciated.
Thanks in advance
Luc
I'm new here, well, I've been reading the forum for a while and decided to donate and post.
I bought a Pac-man upright cab with a 60 in 1 jamma board back in Jan '16. I asked the seller for the Pac-man PCB as well. First thing I found out is that the wiring was a TOTAL mess. All the wiring had been cut off and rewired in the same original pac-man 44-pin edge connector to make it fit into a jamma. A nightmare. (The jamma board is powered by a computer-style power supply).
I eventually identified "most" of the wires and installed a new 44-pin edge connector to be able to use the original pcb.
I also bought a Pac-man to jamma adapter to be able to use the 60 in 1 board.
Right now, the joystick and start buttons are working fine and I can play the jamma board without problems. It is set on Free play and powered by the computer power supply. Sound works fine also.
The slam switch, coins, counter, test switch and credit switch are NOT connected to the edge connector. I'm not sure where each goes in the connector. This is more complicated then I thought. (I'm specifying this since it can trigger the watchdog - reset or something else.)
When I first tested the PCB, I checked all the voltages. They are a bit low:
12v --> I have 11.7v
7v --> I have 6.8v
Same readings on the transformer pins and after the fuse block. I changed the fuses but NOT the block since the voltages are the same. But I have a spare one that I can install.
I have read a lot of webpages so far and I'm stuck.
On the PCB:
-Replaced D44VM4 at Q6
-Replaced the 4 pin adjustable voltage regulator at IR1.
-Replaced 6 Rom set
-Inspected all the board for broken traces and rusted legs.
-I have checked many other voltages on the board.
What I have right now is a screen full of green "F" and it seems that the watchdog is resetting the board. We can see a bell appear at some point but that is the only real sprite I can get.
youtube video: https://youtu.be/iK1bdB5sMYo
Any help will be appreciated.
Thanks in advance
Luc
