Read;Write Head Not Stepping - Control Data Corporation BR8 SERIES Hardware Maintenance Manual

6.5.7 READ;WRITE HEAD NOT STEPPING
Refer to 6.5.4 prior to starting this trouble shooting procedure.
6-10
CHECK U22
PIN 8 FOR
-STEP OUT
PULSE
(FIG. 5-1)
CHECK U13
PIN 13 FOR
TRACK 00
LEVEL
NO
UN
I T
lliQYbQ
NOT STEP
OUT AT TRACK
00 - DRIVE OK
CHECK U22
NO PIN 5 FOR
-STEP IN
PULSE
(FIG. 5-1)
CHECK W6 ON
PWA
YES
CHECK FOR
YES PULSES AT
>---------......M
TP7
(FIG. 5-1)
REPLACE
PC BOARD
CHECK U22
PIN 8 FOR
-STEP
PULSE
(FIG. 5-1)
NO
NO
CHECK I/O
CABLE OR
CONTROLLER
NO
YES
B
YES
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