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7925
Troubleshooting
Table 4-4. Motherboard PCA-A7 Signal Distribution List
(Continued)
SIGNAL
MNEMONIC
DEFINmON
A1
HEAD
ALIGNMENT PCA
A2
I/O SECTOR PCA
A3
SERVO PCA
A4
DRIVE CONTROL PCA
AS
TRACK
FOLLOWER PCA
A6
RIW
PREAMPLIFIER PCA
A7
MOTHERBOARD PCA
COMMENTS
XA1P1
XA1P2
XA2P1
XA2P2
J1
XA3P1
XA3P2
XA4P1
XA4P2
J1
J2
XASP1
XASP2
XA6P1
J1
J2
J3
ICA
Illegal Cylinder Address
6
ICIS
Interlock Chain In AS
17
Interlock chain source from - 24V supply.
ICOS/lCI6
IC06
ICI2
Interlock Chain Out ASlin A6
Interlock Chain Out A6
Interlock Chain in A2
14
15
To pack chamber interlock pin J2-7.
From Spi ndle Logic PCA pin A8P1- T.
IC02/1CI3
Interlock Chain Out A2/ln A3
15
IC03/ICI4
Interlock Chain Out A3/ In A4
To interlock logic on Drive Control PCA
16
-A4.
ILFL
"Not" Interlock Fault LED
To Fault Indicator PCA pin A12J1-2.
IP
"Not" Index Pulse
B
3
LD
"Not" Lock Door (Pack Access)
To Power and Motor Regulator PCA pin
A9J1-47.
LSB
Least Significant Bit
(of Cylinder Address)
16
MHFL
"Not" Multiple Head Fault LED
To Fault Indicator PCA pin A12J1-8.
MHS
"Not" Multiple Head Sense
L
NDPS
"Not" Non-Destructive Preset
0
0
POS
Position
V
DENOTES SIGNAL SOURCE
DENOTES BIDIRECTIONAL SIGNAL
4-57
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