Boltar gen X op-amp.

[marko]

Originally Posted by Perry Babin

If you connect a speaker to either channel, does either channel make the speaker pop, pull in or push out as the amp tries to power up?

no, nothing, not a pop crackle or anything!

[Perry Babin]

What's driving pin 16 of the 494?

[marko]

Originally Posted by Perry Babin

What's driving pin 16 of the 494?

appears to run to 2 components..

C3198 transistor (seams ok)

BA1023A IC

it's hard to see which pin that goes to that IC as the trace runs under the IC!

[Perry Babin]

You can use your multimeter to find continuity between pin 16 and the IC.

Are there any other numbers on that IC?

[marko]

sorry, got the number wrong.. it's BA10324A

http://www.datasheetcatalog.org/data...m/ba10324a.pdf

[marko]

actually, scrub the above, i just realised the trace goes under the IC and out the other end!

..to what looks like a resister pack- ctsk9508 770 83 472.

i have continuity up to here, what happens after here i don't know/understand!

[Perry Babin]

Which leg of the C3198 is connected to pin 16?

[marko]

there's a couple of small resistors in line (r8+r9) then goes to the left hand leg of q5.

i noticed a scorched resisitor (r16) in the lower pic, it appears to be ohming out ok though?

[Perry Babin]

The power supply network is going to make it difficult to troubleshoot without a schematic diagram. See if you can get one from ZED Audio. I'm not sure if ZED produced this amp or if they quit at series 9.

[marko]

it is a zed amp, very last generstion they did before maxsonics..

schematics are hard to get hold of for hifonics stuff