Write Errors - Control Data Corporation BR8 SERIES Hardware Maintenance Manual

u
o·
o
·
-----_
..
_--_. - - - - - - - -
6.5.10 WRI TE ERRORS
Refer to 6.5.4 prior to starting this trouble shooting procedure.
COVER SLOT OR
CHANGE TO
ANOTHER
DISKETTE
CHECK
FOR PRESENCE
>----....
OF WRITE FAULT
INDICATION
USE
j
NO
OSC I LLOSCOPE
CURRENT PROBE CHECK WRITE
TO CHECK CURRENT', VO.LTAGE OR
WAVEFORM " CURRENT
WAVEFORM
AT J2-1 &
CHECK VISUALLY
IF HEAD IS
LOADED
YES
GO TO HEAD
NOT LOADING
J2-2
(Figures
5-1, 6-4)
CHECK
CONTINUITY
OF HEAD
WINDINGS
( Par. 6. 5 . 6)
YES
YES
77834769- U ,
NO
RESET
WRITE
FAULT
CHECK
WRITE ENABLE
PULSE
AT U21 PIN 6
(Figure 5-1)
CHECK FOR
WRITE DATA
PULSE AT
U21 PIN12
(Figure 5-1)
YES
A
6 -15