21 Jul
2002
21 Jul
'02
1:22 p.m.
On Sun, 21 Jul 2002, Tony Duell wrote:
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.
Maybe the head lock is indeed stuck?
-Toth