Table of Contents
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7925
Troubleshooting
3
4
6
8
9
10
11
12
13
14
15
16
17
A
C
B
D
REGULATOR
PROTECTION
CIRCUIT
REGULATOR
PROTECTION
CIRCUIT
SHUNT
REGULATOR
SCSl
NOTE 2
SMAH2
SMAHl
NOTE 2
+36VS --"""'----.
+36 VOLT
BLEEDER
RESISTOR
SPINDLE MOTOR
CURRENT SAMPLING
RESISTOR
-36VS -
......-----'
- 36 VS
~~----'
e~
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P1l1-
SEE FAULT {
DETE.CTION
TOF
SYSTEM
ILF
DlAG RAM
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(B9)
9 (
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SHUNT
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1
Mainframe Assembly
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7
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122kHzI
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4-41
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B3~E~g~T
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Spindle Rotation System
4-43
PHASE 1
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M
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DETECTION
RESISTORR
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Head Positioning System
4-45
/
r - ' -
SYSTEM
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Sector Sensing System.
4-47
CURRENT LIMIT
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- - - - - I
I PH1+ I
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DIAGRAM
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22 kHz
Read/Write System .
.
4-49
LATCH
T
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(A7)
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2.25 MHz
-
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PULSES
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WITCH-S7
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SYSTEM
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7
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P/O
PMR PCA-A9 Jl
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7
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- - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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NOTE: SHUNTS BETWEEN
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ENCA
- - - - - - - - -
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~EN-CB---------------------------~
NOTES:
1.
ALL D-TYPE FLIP-FLOPS ARE CLOCKED ON THE
RISING EDGE OF THE CLOCK SIGNAL.
2. SPINDLE MOTOR GROUND (GROUNDS 3 AND 4).
r;-D~;PC;:.A"i11
DOOR LOCKED
I
I
SWITCH-S6
I
Cn:-::------D-U---)~
3'
> - - - -.......--....
D
C
B
A
3
4
6
8
9
10
11
12
13
14
15
16
17
7311-27C
Figure 4-25. Spindle Rotation System, Functional Diagram
4-43/4-44
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