Someone doing a Taxi restore noted that they had an issue with the capacitor on the pop switches being internally shorted which caused a locking on. Couldn’t hurt to check there.
(Topic ID: 277016)
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1 week later
Quoted from thedefog:Pulled the aux pwr drv board. Everything looked good, zero ohms resistors are good, BR1 tested fine too, but reflowed solder everywhere and replace BR1 as well. Replaced the 2.5A fuse for the Red-White wire, as well as the 25VAC 7A fuse. Fuse clips have decent tension. No corrosion or anything. Checked ohms from red-white wire at the Aux Pwr drv directly to the coils - 0.1 ohms. Checked each pop's return wire @ 1J18 - 0.1 ohms. All good with power and return.
Fired up the coil test. Same result as before. During CPU test, the left pop just faintly attempts to power on, the others are even weaker. So it is MPU again, only now with the SoF MPU.
Unplugged 1J18 & 1J19 and manually fired all 3 pops just fine to the gnd strap, full power. Checked the SoF MPU, all the SS section TIP102s and pre-drivers tested fine on this MPU, along with U45, U50 that were previously socketed.
Next test is to remove the SoF MPU, checked it over deeper then pop it back into SoF to test and see if whatever is going on with Taxi screwed it up. At least that would give me insight into what it is doing and narrow it down further.
Do your new switch stacks have the capacitors on them? I know if those are missing it can cause weak fires.
Quoted from thedefog:thank you for the reference, helpful
No problem, it looks like you might have the incorrect ground wire on the lower bumper (could also just be that mine is faded), and I can’t tell for sure but on mine the resistor and cap go to the same two lugs while the diode is independent it looks like that might be different on yours. Are your actuation and scoring switches shorted together via a cap or resistor?
Quoted from thedefog:I put the Taxi MPU into my SoF. SoF has no issues with it, works fine in it so far.
If both MPU are functioning properly in SOF and the SOF MPU was damaged in Taxi. It seems like it would have to either be a aux power issue or a playfield issue. This ones been a tough cookie.
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