That particular time is typically when you turn your game on, the lights come on, and alison angel ftv wake up that's.
In turn, transistors and chips would fail.
The only silver lining is that some of the Ni-Cad batteries installed on Gottlieb CPU boards can last longer than others.Reinstall the pbdb and test.This sound amplifier board is used in concert with MA-766 and MA-886 sound boards.8.4 Results of a locked on coil Melted coil sleeve Burnt paper If a coil locks on (due for example to a bad driver board transistor the coil will burn.If the sound appears to be cutting out or their are no sounds at all, the header joints on the MA-483 may have developed cracks.
Ensure it isn't "stuck" Check the R/W (read/write) signal at the 6502.
Consult the game manual / schematics to find the source of 6VDC on the transformer board power supply.
Connecting all the grounds to cabinet ground (green/yellow wire).
Put each lead of DMM on opposite ends of the fuse.
Closed switches complete the circuit and enable a switch matrix return.All other jumpers should remain installed.The other end of this resistor will be soldered to the junction point of resistor R2 and the anode of zener diode CR2.The cap is easy to remove and replace.To permanently close the switch, remove the solder mask by scraping with a sharp knife or screwdriver.One useful aspect of the board is that 4 channels of sound are summed by the LM324 at B1 before final amplification offboard.The leaky cap can be seen in the top of the picture.If voltages on the display board are within spec, it may be advantageous to check all of the data signal edge connector pins on the CPU board and the display board.This process starts by sanding the traces and solder pads until shiny copper is exposed.
Includes System 1 and 80 parts and boards.