dasvis
Member
I am in the process of bringing an '82 Mr & Mrs Pacman pin back from the dead & need some help with the displays. Score displays are 7-digit.
Have rebuilt the rectifier board, the Solenoid driver board, the Squawk & talk board, & the battery damaged MPU board. All voltages are now within spec.
The pin will now boot up, & I can run it thru self diagnostics. When I get to the display test, it will flash & count up on only the 100, 1000, & 10000 digits -- the 1's, 10, 100000, & 1000000 digits are blank on all displays.
I have swapped displays around to different positions, checked the J1 header pins on the MPU board for corrosion (found none, but lightly sanded the pins anyway just in case), reflowed the solder connections on the MPU J1 connector & on the #1 display, I have tested the wiring harness for continuity to the display & it checks ok. I am at a loss on this.
I was getting some weird behavior from the center 6-digit credit display, so I replaced the 100k ohm resistors & it solved the odd segments lighting up, but still it too will only flash the 3 digits.
I have ordered an MPU connector kit & plan on replacing both the male & female side of all of the connectors just in case - but I doubt that is the solution.
Can anyone help shed some light on my problem? I am a pinball repair newbie, but so far it has been a lot of fun!
Mike
Have rebuilt the rectifier board, the Solenoid driver board, the Squawk & talk board, & the battery damaged MPU board. All voltages are now within spec.
The pin will now boot up, & I can run it thru self diagnostics. When I get to the display test, it will flash & count up on only the 100, 1000, & 10000 digits -- the 1's, 10, 100000, & 1000000 digits are blank on all displays.
I have swapped displays around to different positions, checked the J1 header pins on the MPU board for corrosion (found none, but lightly sanded the pins anyway just in case), reflowed the solder connections on the MPU J1 connector & on the #1 display, I have tested the wiring harness for continuity to the display & it checks ok. I am at a loss on this.
I was getting some weird behavior from the center 6-digit credit display, so I replaced the 100k ohm resistors & it solved the odd segments lighting up, but still it too will only flash the 3 digits.
I have ordered an MPU connector kit & plan on replacing both the male & female side of all of the connectors just in case - but I doubt that is the solution.
Can anyone help shed some light on my problem? I am a pinball repair newbie, but so far it has been a lot of fun!
Mike