Dead Star Trek

Zinfer

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Good voltages from PS. Coin Lamps on. Fan on rear access door running. Monitor disconnected for repair. No joy with the CPU boards' LED. She's dead Jim. Would the CPU board be the first place to start? Full details at www.zinfer.com/startrek.htm
 
OH WAIT- you sprayed lubricant into each connector hence shorting out the board set--- BIG MISTAKE ? Any fuses blown seen on the board set? Check the board set over again especially by the connectors for blown resistors.
 
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While I wouldn't have sprayed lubricant onto the board, I doubt it shorted anything out. Most of those spray lubricants are relatively non-conductive, and certainly wouldn't draw enough current (10A or so) to kill the 5V supply (or fuse) that drives the LED. And if it did, you would have DEFINITELY noticed.

But since you say the pins were stuck and you got an LED, but after unsticking you lost the LED, I'd say you've got a connector problem. Test your voltages at the board, and wiggle the connector a little... you'll probably need to replace the connectors on the board and harness.

DogP
 
The set was dead before I pulled it. Or did I state otherwise? Meh - I need some new chips in my head. At any rate I built a test rig on the bench last night with a spare busboard. It came up with graphics on the scope dancing around and I'm getting good sound board. Placed the boardset back in the cabinet with the original bus and it's working.
I'm thinking the flakey G80 ps is the responsible party. I definitely need to rebuild that. Right after I recap the G08.
At any rate, thanks fellas for jumpin in. I'm hoping this baby holds unlike a berzerk zpu. :p
 
To be quite honest - it FELT like those boards haven't been out of there in 30 years. They were jammed in, stuck solid, weren't budging without a pair of plyers. They were that stuck. I was so afraid I was going to break those plastic pushpins it wasn't funny. I'm not exaggerating. It absolutely required some silicon lubricant on the rails after I removed the boardset. I didn't actually spray anything on the boards themselves. The busboard in the rear of the cage yes, but you honestly couldn't consider that a spray, more a mist by the time it reached it's destination. But in any event, the boards are sliding in and out of their channels today although I am doing my best not to disturb them or overly handle them. They're going into their anti-static bag in a box while the cabinet is torn down of parts to be restored.
The trick to freeing 30 year stuck classic unreplaceable pcb's (not for the faint of heart):
http://i269.photobucket.com/albums/jj63/rmassman/DSC01442.jpg

While I wouldn't have sprayed lubricant onto the board, I doubt it shorted anything out. Most of those spray lubricants are relatively non-conductive, and certainly wouldn't draw enough current (10A or so) to kill the 5V supply (or fuse) that drives the LED. And if it did, you would have DEFINITELY noticed.

But since you say the pins were stuck and you got an LED, but after unsticking you lost the LED, I'd say you've got a connector problem. Test your voltages at the board, and wiggle the connector a little... you'll probably need to replace the connectors on the board and harness.

DogP
 
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