boganvilla
New member
I've got a Ms Pac that was working fine but now keeps on resetting. At one stage it was resetting once you got to the second maze but now when you hit the 1 player start button it plays the intro music and then resets.
This happens with both of my Ms Pac PCB's one of which has already had the Riptor treatment and has had new eProms and sockets put on it.
I've been pretty thorough with this one and have done the following:
Replaced the 4 pos fuse block.
Replaced all 6 fuses with some new ones from Bob Roberts.
Cleaned the 2 pos fuse block.
Replaced the PCB edge connector (solder type).
All fuses meter out ok so are still good but after all this it still resets.
I want to rule out the power supply so as per lawnmowermans page Iv'e check all the voltages and have come up with this.
Voltages at the fuse holders
11.1 VAC
11.1 VAC
6.5 VAC
6.5 VAC
Voltage across C2 and C3 on the PCB.
5.08 VDC (c3)
5.06 VDC (c2)
Voltage across un-banded side of D7 and D8
12.9 VAC
Voltage across un-banded side of D3 and D4
22.3 VAC
Voltage from GND on edge connector to R52
12.7 VDC
Voltage from GND on edge connector to base of transistor on heatsink
5.9 VDC
Do all these voltages seem ok?
I'm a bit stumped as to what else could be causing this.
This happens with both of my Ms Pac PCB's one of which has already had the Riptor treatment and has had new eProms and sockets put on it.
I've been pretty thorough with this one and have done the following:
Replaced the 4 pos fuse block.
Replaced all 6 fuses with some new ones from Bob Roberts.
Cleaned the 2 pos fuse block.
Replaced the PCB edge connector (solder type).
All fuses meter out ok so are still good but after all this it still resets.
I want to rule out the power supply so as per lawnmowermans page Iv'e check all the voltages and have come up with this.
Voltages at the fuse holders
11.1 VAC
11.1 VAC
6.5 VAC
6.5 VAC
Voltage across C2 and C3 on the PCB.
5.08 VDC (c3)
5.06 VDC (c2)
Voltage across un-banded side of D7 and D8
12.9 VAC
Voltage across un-banded side of D3 and D4
22.3 VAC
Voltage from GND on edge connector to R52
12.7 VDC
Voltage from GND on edge connector to base of transistor on heatsink
5.9 VDC
Do all these voltages seem ok?
I'm a bit stumped as to what else could be causing this.