Specifications

fABLE 12·2. INSPECTION OF THE DRIVE"
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DESCRIPTION
THE DRIVE
THEPCa ..
EXTERNAL
COVER DAMAGE/BEND IN COVER ETC.
X
LEAK IN THE COVER GASKET
X
CUT IN THE FLEX CABLE OR 1fRACES BROKEN IN FLEX CABLE
X
PeS·S SMOKED/BURN OUT
X
MISCELLANEOUS BROKEN PARTS
X
NOISE FROM HDA MAY BE OUETO:
HEAD DAMAGE
X
BAND BROKEN
X
DISC NOT CLAMPED
X
DAMPER LOOSE X
NOISY SPINDLE MOTOR
X
DRIVE NOT COMING UP TO SPEED~ COUNT THE NUMBER OF FLASHES
ON LEO
1
TIME
X··
2 TIME (NOT ASSIGNED)
3
TIME
X
4 TIME X
5 TIME·
X
X
6 TIME
X
7TIME X
-TRY WITH KNOWN GOOD PCS'S.
--MOST LIKELY THE POWER SUPPLY.
3t'02·14
TABLE 12·3. SIGNALS INSPECTION
CHECK THE DIFFERENTIAL SIGNAL ON TP11 AND TP12 IN BOTH WRITE AND READ MODE ON ALL THE HEADS AND
RECORD AMPLITUDE AND RESOLUTION.
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DESCRIPTION
THE DRIVE
THE PCB'S
EXTERNAL
SIGNAL LOOKS OK ON SOME HEADS AND NOT ON OTHERS
X·
SIGNAL LOOKS GOOD ON TP11 AND TP12 AND NOT ON TP1. AND TP16
X
DRIVE NOT HANDLING DATA
X
WRITE FAULT WHEN TRYING TO WRITE
X
DRIVE NOT SEEKING
X
SIGNAL LOOKS GOOD ON TPll AND TP12 DURING WRITE MODE BUT
X
X
NO SIGNAL DURING READ MODE
12.6 CHECKS AND ADJUSTMENTS
The only adjustment necessary to the 706/71215 brake adjustment after instaUlJ1g a new PCB, or when necessary.
The foUowing steps define the procedures to be followed (see figure 12·1):
a.
With the control PCB Is Its normal position, note that the brake pad and spindle motor can be seen )
through the slot opening.
b. Loosen the five saews securing the PCB to the drive: do not remove.
12·2