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Index Pulse Missing - Control Data Corporation BR8 SERIES Hardware Maintenance Manual

Table of Contents

6.5.5 INDEX PULSE MISSING

6-8

PERFORM

DISKETTE NOT

ROTATING

(PARA

6.5.2)

REPLACE

PHOTO-

TRANSISTOR

REPLACE

LED

NO

CHECK TO SEE

IF DISKETTE

PROPERLY

INSTALLED

CHECK

DISKETTE

ROTATION

CHECK TPI4 FOR

PULSE SHOWN IN

FIG. 5-1

YES

TURN DISKETTE

OVER, REINSERT

CHECK AT UI5

PIN 8 {-INDEX)

FOR PULSE

SHOWN IN FIG.

5-1

YES

REPLACE

'PC BOARD

l

'-

..

(

'

.............

. 77834769..:A

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