Specifications

SECTION XII
MAINTENANCE
12.1 INTRODUCTION
The Shugart 706/712 has been designed to require no maintenance under normal operating conditions. This sec·
tion will discuss those steps to be taken in the event of a .drive malfunction.
12.2 MAINTENANCE EQUIPMENT
The only equipment required ls an ADC T-650 Tester and an oscilloscope. Refer to paragraph 9.2.3. for ADC test
procedure.
12.3 DIAGNOSTIC TECHNIQUES
The 706/712'5 are eqUipped with a self-exerciser that supplements any diagnostic requirements.
12.4 TEST POINT LOCATIONS
Although test points are evident on the PCB. these are used for testing during the manufacturing operations. No
testing is reqUired of the end user.
12.5 TROUBLESHOOTING
Tables 12.1 through 12.3 show the procedures for determining possible problems.
TABLE 12·1. PCB VERSUS DRIVE FAILURES
PROBLEM IS IN
DESCRIPTION THE DRIVE THE PCI'S EXTERNAL
MOST ERRORS OCCUR ON TRK 00
X
ERROR OCCURS ON TRK 317
X
WRITE FAULT IN WRITE MODE
X
ONLY SELECT HEAD 0 AND HEAD 1 NOT HEAD 2 AND 3
:
X
SYSTEM TIME OUT ERROR·
X
X
DRIVE UNABLE TO COME UP TO SPEED·
X
X
DRIVE NOT RUNNING TESTS WITH OTHER FIXED DRIVES·· X
BRAKE NOT FUNCTIONING RIGHT···
X
GND BUTTON NOISY
X
~
-TRY WITH KNOWN GOOD PCS'S. IT COULD BE THE DRIVE OR PCS'S.
·-MAKE SURE TO CHECK THAT THE PCS'S HAVE DRIVE SELECT JUMPER AND TERMINATING JUMPERS.
---ADJUSTMENT OF BRAKE IS VERY IMPORTANT. USE 20 MIL SHIM FOR PROPER ADJUSTMENT BETWEEN BRAKE
AND SPINDLE.
12·1