1084S Monitor, 1 sound channel not working, hard to fix?

[zonaps2]

Hi, I have this 1084s monitor working with my A500. I've got them since 1990.
One of the sound channels looks like it doesn't work anymore, i'm not an electronic guy, but have fixed stuff.

If I disassemble the monitor, will it be a easy repair? or will I found stuff imposible to fix?

I know it is the monitor and not the A500 'cause I've changed the cables.

Thanks! :-?

[JimS]

It ought to be a straight forward repair, since there are 2 sound channels and you can compare one to the other. But since you say you are not an electronics guy, you should know that there are potentially lethal voltages inside monitors. There are at least 3 versions of the 1084S, so you'll have to find the right schematics...

[zonaps2]

Ok, thanks for the warning, I know that danger, I've hacked an arcade monitor before. I'll disassemble and look for the problem.

thanks again

[rkauer]

 The 1084(S) use a TDA2611 as power amplifier chip. Expect to find two of those inside the case.

 It is the only semiconductor on the audio circuit, so you can expect three problems in the circuit:

 1- "Burned" audio chip (TDA2611);

 2- Broken loudspeaker or its cable;

 3- A bad potentiometer.

 This is the probably problem sources in highest order.

[zonaps2]

thanks for your help.
I've disassemble the monitor and cannot found that chip you said, I found TDA chips but with other numbers. Monitor model is 1084s-D1.

I plugged some earphones into the side minijack input on the monitor and I can hear both channels, does this mean that it is a broken speaker? if it is, how can i replace it?, i mean the ohms and that stuff.

thanks again!

[rkauer]

 The original 1084S uses the said TDA2611 (mono versions).

 Maybe they use another power amplifier chip on stereo models (I just have one schematic here). Chip is IC301 on it.

 It uses an odd 16 Ohms x 3W, accordingly to the schematic.

 Better take the original out of the case and bring it with you to an electronic parts store.

 Better than that, use a real stereo amplifier with your Amiga, you don't regret it.