TA7317P

[John Smith]

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

 

[N_Cook]

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

 

[Phil Allison]

"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