1571/C128D ALIGNMENT/REPAIR TEST
VERSION 1.2.1
* SIGNALS FROM ADVANCED CHART 2 MUST BE MEASURED WHILE ONE OF THE KEYS,
(+) OR (-), IS BEING HELD DOWN AND THE READ/WRITE HEAD IS STEPPING
C128D STEPPER MOTOR CONTROL LOGIC — ADVANCED CHART 2
***** i n c o r re c t STEPPER MOTOR SIGNAL FROM BASIC CHART 2 *****
CHECK IC
PINS
EXPECTED 1 INCORRECT SIGNAL
SIGNAL 1 PROBABLE FAILURE
Ulll - 3
U110 - 13
U109 - 11
+5 VDC LEVEL WITH 0 VDC LEVEL PULSE
0 VDC LEVEL WITH +5 VDC LEVEL PULSE
+12 VDC LEVEL WITH 0 VDC LEVEL PULSE
Ulll - U110
U110 - U109
U109 - Q101
CHECK
CONNECTOR
EXPECTED
SIGNAL
INCORRECT SIGNAL
PROBABLE FAILURE
CN15 - PIN 1| +5 VDC LEVEL WITH +12 VDC LEVEL PULSE| Q101- BAD DRIVE
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