Yamaha sw500

[ca7922303]

Powered subwoofer, powers on, no output, clicks after power on. Fuses good, speaker blown, reads 0.00 ohms.

[Helmholtz]

Aha.

[ca7922303]

Q233 (1.17v), ic201(+15v), ic202(-15v), all 9 opamps are pin#4(-15-), pin#8(+15v).

[Helmholtz]

Without schematic we can't know which parts you're speaking of.

Meanwhile disconnect speaker, check for DCV at output and verify power rails.

[Jon Snell]

Unless you can read accurately a 6 Ohm inductive load, I suggest the speaker is OK. If blown it would be open circuit.
Use a 1.5v battery to test it.
Here is a basic schematic, check the DC level on the output stage if OK check the auto on circuit.

[g1]

Service manual available here: https://www.manualslib.com/download/...aha-Sw500.html

[Helmholtz]

Unless you can read accurately a 6 Ohm inductive load, I suggest the speaker is OK.

Can't make sense of this. If the speaker has a DCR of 0R, the voice coil is shorted.
The inductive part of speaker impedance is typically below 30%, rest is DCR.

[ca7922303]

Speaker has been replaced, I was just stating that existing speaker had maybe been damaged by amp. I only have the amp to test. Enclosure w/speaker is elsewhere.

[Jon Snell]

Can't make sense of this. If the speaker has a DCR of 0R, the voice coil is shorted.
The inductive part of speaker impedance is typically below 30%, rest is DCR.

Read the rest of the sentance, about a battery to test it.
We cannot see it, work on it or test it, so we can only guess.
A battery is a definitive test.

[Jon Snell]

Speaker has been replaced, I was just stating that existing speaker had maybe been damaged by amp. I only have the amp to test. Enclosure w/speaker is elsewhere.

I/we didn't know that.
Take a few measurements on the DC level with the output stage, that will tell you where the issue is. Both halves of the bridge output shoud sit at or very close to zero volts DC.
When you say Q233 1.17v ... where exactly?

[The Dude]

Unless you can read accurately a 6 Ohm inductive load, I suggest the speaker is OK. If blown it would be open circuit......

That's generally true. However, in recent years, I've seen more shorted speakers. Most of them have been in the Harbinger powered speakers. Just saying, it does happen.

[Helmholtz]

A battery is a definitive test.

Sure, a battery is a good test.
But even after reading the first part of your post several times, I don't understand what it means.

[ca7922303]

Correction: I had the Eminence kappa 15A here to recone and it reads OL on all resistance ranges also 9v battery tested at 9volts produced nothing from speaker.

[ca7922303]

Anything stand out from the readings that I previously gave you now that you have schematic? Thanks for your help.

[g1]

Not really. Do check output for DC.

Meanwhile disconnect speaker, check for DCV at output and verify power rails.