(Topic ID: 69131)
Linked Games
4 Aces
Williams, 1970-
Baby Pac-Man
Bally, 1982
-
Buck Rogers
Mambelli, 1980
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Camel Lights
Game Plan, 1978
-
Comet
Williams, 1985
-
Cyclone
Williams, 1988
-
Genesis
Gottlieb, 1986
-
Getaway: High Speed II, The
Williams, 1992
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Omaha, NE
2 months later
1 week later
Quoted from mof:can be buffed to a fantastic shine.
-mof
What is your technique for polishing mylar? I have several machines with old mylar that is a little cloudy but in otherwise very good condition (Xenon, High Speed, Twister).
1 month later
I just completed a project to replace the TIP42 transistors with MOSFETs and remove the 27 ohm cement resistors in the lamp matrix section of the MPU from my Batman Forever, Time Machine and High Speed (the lamp matrix circuitry is nearly identical for all of them). The changeover is seamless and the result is much lower heat in the backbox and the risk of heat damage to the MPU board is eliminated (the cement resistors get very hot). Here is a link to a post I did in the BF thread:
https://pinside.com/pinball/forum/topic/suppose-we-flipbatman-forever-club/page/10#post-3562010
1 week later
Quoted from desertT1:My speaker grill was coming off when I got mine. I pulled it the rest of the way off, took off the fabric, and have it sitting in the sun under a sheet of glass to try and flatten it out a little. Do I have any options for what fabric to put on there? Anyone seen anything cool that I might look into for mine?
My speaker grill fabric was faded so I replaced the entire original speaker mounting with a board cut for two 4" coaxial speakers. The board was cut from particle board and then painted flat black. The "fabric" is dark gray fiberglass screen that I had on hand for screen door repair (available at any hardware or big-box home improvement store). It was glued to the back of the board. The original speaker is 8 ohms, so two 4 ohm speakers wired in series gives you the same impedance. I also installed a 6 inch sub and a separate volume control for the two coax's to get more sound to the sub. It is a very impressive bargain-basement upgrade. Attached is a picture of the head unit speakers.
Quoted from desertT1:Also, One of my pops was blowing a transistor. I put a new one in and it killed that too. Any suggestions as to what to inspect? I don't think the coil was getting locked on, but it was hot, so who knows. I think the game played a little while before I noticed the smell.
At some point the coil locked on and/or something on the MPU failed resulting in the smoked driver transistor. The chances are really good that everything "upstream" from the driver transistor is also ruined so simply replacing it will result in another failure. You will need to check your MPU schematic and possibly replace the driver, the pre-driver SCR, a buffer IC (I think?) and the PIA. You'll probably also need to replace the coil. You can check it by taking a resistance reading across the solder tabs and comparing the reading to the other pop bumper coils that are known to be good. If the resistance reading is lower, it is bad.
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