21 Jul
2002
21 Jul
'02
4:15 p.m.
I think that sounds far to low to move the heads
-- I would expect a few
volts at least. So you might well have a servo problem. As a first
attempt (not having schematics), check the power transistors on the
servo board. I think 6 of them are to drive the spindle motor, the other
4 (?) are the servo power amplifer. The V150 I worked on used discrete
transistors (not an amplifier chip), so I would guess the V170 does too.
I checked the voltage again, with the servo plug disconnected, and got
just under 12VDC across the terminals. With the servo plug connected, it
reads right at 0.4VDC.