9 Feb
2011
9 Feb
'11
12:53 a.m.
I think I know what you mean now. That TA 7259 is the chip underneath the
large brown clip/cover at the front of the drive. I'm not sure how to
remove the latter though? I seems solidly glued in covering the pins of the
chip. If I could remove this, I could measure the signals on these pins
when I tap the switch (thereby fooling the drive into thinking a disk is
present).
Or do you need to remove the motor, switches, plugs and then slide the motor
PCB out towards the rear until it's clear of that clip/cover. Thinking
about it, that's probably what's needed. In that case, it won't be so easy
to test as everything will be in bits.
Terry
Now, there seem to be 3 ICs on the motor PCB, same as
the standard one.
tHe 2 SIL packages (black plastic strips with 9 pins in a row along the
bottom edge) are a dual op-amp and the speed control PLL. The modifed DIL
package at the front labelled TA7259 is the motor controlelr I've been
mentioning. I hve checked, you can get a data sheet on that from
http://www.datasheetarchive.com//