Some time ago I was trying to repair a powered mixer which used a TA7317P
output protection device.

It turned out that when I got more devices from another distributor they
worked exactly as expected. The relay turned on after a delay of a few
seconds and all voltage readings made sense.

So in future I will test any TA7317P devices to confirm that they really do
seem to be TA7317P before fitting them.

Whether the devices were fake or accidentally put in the wrong package I do
not know.

I sent them back to the original distributor today.

I would like to thank everyone who assisted me in that thread, particularly
Franc Zabkar.

I also fixed the Yamaha XM6150. In addition to both darlington output
transistors being short circuit, one of the emitter resistors was open
circuit despite its appearance.

Old Guy

John Smith wrote in message
...
Some time ago I was trying to repair a powered mixer which used a TA7317P
output protection device.

It turned out that when I got more devices from another distributor they
worked exactly as expected. The relay turned on after a delay of a few
seconds and all voltage readings made sense.

So in future I will test any TA7317P devices to confirm that they really
do
seem to be TA7317P before fitting them.

Whether the devices were fake or accidentally put in the wrong package I
do
not know.

I sent them back to the original distributor today.

I would like to thank everyone who assisted me in that thread,
particularly
Franc Zabkar.

I also fixed the Yamaha XM6150. In addition to both darlington output
transistors being short circuit, one of the emitter resistors was open
circuit despite its appearance.

Old Guy





I recently replaced some quarter inch audio jack sockets only to find the
fixed and moving contacts were swapped over on the original ones - I've
never seen that before

"Nutcase Kook "


I recently replaced some quarter inch audio jack sockets only to find the
fixed and moving contacts were swapped over on the original ones - I've
never seen that before


** Saw just that the other day on a Marshall JMP-1 pre-amp.

The input jack (Cliff , chrome insert type ) is reversed while the adjacent
footswitch jack is normal.

Bit of a trap for the unwary....


..... Phil