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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: DIY folks, can you help me out with this? posted by Bosh on March 30, 2002 at 17:20:54:
Set your VOM / DVM to AC volts. Inject signal into both channels of the amp (if you don't have a gen, use FM interstation noise). Take readings of the signal level at each node of the good channel; at the input to the first stage amplifier, the output of the first stage amplifier, etc.Now, start at either end of the bad channel circuit, and start walking forward / backward through the circuit with your voltmeter, taking readings at the same places as you did on the good channel. Keep your notebook open beside you, and use it. In this way you will find the place where the signal disappears in a remarkably short time and with little PITA. The availability of the good channel for reference is a break.
Once you find the circuit section (subcircuit, like the voltage amplifier, or output driver, etc.) that's not doin' de do, you can start checking the voltages of that subcircuit in situ; isolating components and testing resistances and continuities. Just keep turning up the magnification until you've found the very molecule where that durn signal terminates, and do the obvious thing - replace the component, resolder the joint, wiggle the tube in the socket; whatever it takes.
Questions? Post back.
Poinz
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Follow Ups
- Standard troubleshooting practice: - Poindexter 19:39:55 03/30/02 (3)
- You are WAY over my head, dewd, - Bosh 21:49:32 03/30/02 (2)
- Uh - oh! - Poindexter 00:50:31 03/31/02 (1)
- Thanks much. Will write. <nt> - Bosh 08:36:25 03/31/02 (0)
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