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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Tektronix 485: How to get to vertical attenuator?
Hi all,
I got hold of this cheap ($100) Tek 485 that is working fine except for three things: The variable volts/div pot on channel B doesn't pop up smoothly, and when it does it doesn't turn at all; the lights on the 100M/50R selection on channel B don't work (the switch works though), and the variable timing pot doesn't turn. Never having done anything on a 485 I opened up the case, turned it upside down, and I can see the two aluminum "boxes" for the channel attenuators. I removed the knobs from the B channel and a few screws, and I can "pop" the attenuator back, but not enough for me to actually pull it up and get to it -- it meets the power supply board too soon (there's also a little aluminum "T" connecting the A and B boxes). Is there any way for me to get to the attenuator circuitry without more serious dismantling? I downloaded a copy of the service manual but it didn't help much. Best, - Cesar |
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