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10-82
SERVICE HINTS
VOLTAGE CHECKS
Wi th the H-201 installed in your test fixture, perform the
following voltage checks with your multimeter.
The GND
test point is a good place to connect the cammon lead of
the mul timeter.
It
is assumed that the disk drive cables
are disconnected fram the controller board.
•
The voltage at PS 1-5 is +5 VDC.
•
The voltage at PS2-12 is +12 VDC.
•
The voltage at PS3-5 is +5 VDC.
•
The voltage at CP2 is +1.40 VDC.
-t!>
VDC
+5VDC
+1.40 VDC
+12VDC
FLa>PY DISK
PI
CONTROl.1.£R
If the voltages at these test points are within 5% of the
values stated, it can be safely assumed U1, U5, and the
voltage regulators are operating properly.
Assuming the
problem still exists, further aid can be found in Logic
Level Checks and Waveforms.
Otherwise, proceed to the
Alignment and Adjustments.
5-169
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