HP 7925D Service Manual page 246

7925 Appendix A
Table A-12. HP 7925H Power Distribution List
CONNECTIONS VIA MOTHERBOARD PCA-A7
CONNECTIONS VIA MAIN HARNESS
CONNECTIONS VIA
CABLE 13365-&0007
R/W
FAULT
SUPPLY VOL TAGE
DATAPCA MICROPROCESSOR
SERVOPCA
DRIVE CONTROL TRACK FOLLOWER PREAMP MOTHERBOARD PCA
SPINDLE
PMR PCA ENCODER
INDICATOR
INDICATOR
DATA SELF-TEST
PCA PCA PCA
PCA LOGIC PCA peA peA
PCA
PCA
PCA
A1*
A2* A3 A4 A5 A6 A7
AS A9
Al0
A11 A12 A1 A13
XA1P1
XA1P2 XA2P1 XA2P2
XA3P1
XA3P2
XA4P1 XA4P2 J2
XA5P1 XA5P2 XA6P1 J1 J3 P1 J1 J1 J1 J2 J1 J2 J1
9,10, 9,10,
+5V
4,5, 4,5, 4,5, 4,5,
11,12,
4,5,
17,18, 4,5, 5 13 4
11, 12,
25,26 25,26
D,E D,E D, E D,E
13,14,
D, E U,V
D,E
13,14,
15,16 15, 16
(J
3,C 3,C
C +12V 3,C
3,C 3,C 9,K 20,X 3,C 5
c
w
~
<
..J
:::>
C)
w
a:
-12V
2,8 2,8 2,8 2,8 2, 8 lO,l 21, Y 2,8
-24V
14 11, M 19,W
c
w
~
2<
CJ
:J5
O
+10V
6
C)
w
ex:
1,A 18, V
1,-A
18,V
1,A
18,V
1,A 18,V 1,A 18, V
7,8,
22,23, 4 1,16,
2 2 11, 13, 11, 13,
12,
Z,AA
A,V 15,17, 15,17,
N,P 19,21, 19,21,
23,24, 23,24,
GROUND
27,28
27,28
DENOTES SOURCE
* WHEN DSU IS INSTAllED, SLOTS Al AND A2 CONTAIN
HEAD ALIGNMENT PCA AND I/O SECTOR PCA, RESPECTIVELY.
A-73/A-74