Electronics > Repair

Wavetek 182A Function Gen Teardown And Repair

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PA0PBZ:

--- Quote from: EpicIntelGamer on August 22, 2013, 08:37:14 pm ---It fails step 12. So it says to check U7 and Q7 and associated circuitry, help?

--- End quote ---

It would make things easier if you post why it failed. What is the voltage at the emittor of Q11? What is the voltage at the cathode of CR10?

EpicIntelGamer:

--- Quote from: PA0PBZ on August 22, 2013, 09:02:38 pm ---
--- Quote from: EpicIntelGamer on August 22, 2013, 08:37:14 pm ---It fails step 12. So it says to check U7 and Q7 and associated circuitry, help?

--- End quote ---

It would make things easier if you post why it failed. What is the voltage at the emittor of Q11? What is the voltage at the cathode of CR10?

--- End quote ---

It failed because it shows .6V, which is not either higher than +1.25v or lower than -1.25v

EpicIntelGamer:
I spent another 3 hours on it and I tried replacing some components and I don't know what I did but where it used to show .6VDC off of Q11's emitter, now it shows 0VDC and nothing I do can make it come back (even after replacing the original components).


EDIT: I have a feeling Q11 is bad, what are some common transistors I could replace it with?

PA0PBZ:

--- Quote from: EpicIntelGamer on August 22, 2013, 09:11:30 pm ---It failed because it shows .6V, which is not either higher than +1.25v or lower than -1.25v

--- End quote ---

The way I read it is that either > +2.5V or < -2.5V is a fault condition, 0.6V seems ok.


--- Quote ---I don't know what I did but where it used to show .6VDC off of Q11's emitter, now it shows 0VDC and nothing I do can make it come back

--- End quote ---

What voltages do you have on the base and collector? Is the +15 and -15 still ok?
If you think you killed something start again with table 6.2 item 1.

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