jb007gd
New member
Hello all,
I recently picked up a Tempest cocktail with a monitor that had blown F100 and F101 fuses. I installed an LV2000, did the Bob Roberts cap kit and additional parts package and resoldered the connectors.
I tried the monitor and the spot killer is lit. I cranked up the brightness and got this:
http://yfrog.com/0k20100326163214j
Not exactly a collapsed screen, but there is a clear line on the right hand side. Not sure what the faint rainbow colors in the middle mean. The screen changes around a bit but doesn't significantly deviate from whats in that picture.
I measured the voltages on the X and Y lugs on the game board and the Y is outputting a steady 10 volts. The X hovers between -.1 and .1 volts. There are two red LEDs on the game boards and they are both lit, but I'm not sure if that's a good or bad thing.
I flipped the test switch and powered the game up. The start buttons stay lit and there are no beeps. The game is set to freeplay so if I power up the game normally and press Player 1, I hear three beeps then the game starts and I can play it blind. Not sure if those three beeps are normal or not.
I'm thinking the monitor could actually be working now but it appears the board isn't putting out the vector signals to the monitor. I'm not afraid to try working on the boards but I have never done any board work before.
One thing I read while searching through the forums is possibly a bad MC1495 chip. Does this sound like a good next step and if so, can these be tested with a multimeter? (Because that's all I've got!
Thanks!
- Jay
I recently picked up a Tempest cocktail with a monitor that had blown F100 and F101 fuses. I installed an LV2000, did the Bob Roberts cap kit and additional parts package and resoldered the connectors.
I tried the monitor and the spot killer is lit. I cranked up the brightness and got this:
http://yfrog.com/0k20100326163214j
Not exactly a collapsed screen, but there is a clear line on the right hand side. Not sure what the faint rainbow colors in the middle mean. The screen changes around a bit but doesn't significantly deviate from whats in that picture.
I measured the voltages on the X and Y lugs on the game board and the Y is outputting a steady 10 volts. The X hovers between -.1 and .1 volts. There are two red LEDs on the game boards and they are both lit, but I'm not sure if that's a good or bad thing.
I flipped the test switch and powered the game up. The start buttons stay lit and there are no beeps. The game is set to freeplay so if I power up the game normally and press Player 1, I hear three beeps then the game starts and I can play it blind. Not sure if those three beeps are normal or not.
I'm thinking the monitor could actually be working now but it appears the board isn't putting out the vector signals to the monitor. I'm not afraid to try working on the boards but I have never done any board work before.
One thing I read while searching through the forums is possibly a bad MC1495 chip. Does this sound like a good next step and if so, can these be tested with a multimeter? (Because that's all I've got!
Thanks!
- Jay
