HP 7925D Service Manual page 245

Appendix A
Table A-II. HP 7925H Motherboard PCA-A7 Signal Distribution List (Continued)
7925
AS
A6
A1*
A2* A3
A4
TRACK
R/W A7
DATA peA MICROPROCESSOR SERVO PCA DRIVE CONTROL PCA PREAMPLIFIER MOTHERBOARD peA
SIGNAL
DEFINITION
PCA
FOLLOWER PCA
PCA
COMMENTS
MNEMONIC
XA1P1 XA1P2 XA2P1 XA2P2 XA3P1 XA3P2 XA4P1 XA4P2 J1 J2 XA5Pl XA5P2 XA6P1 J1 J2 J3
UWG U nselected W rite Gate 9 9
WAF[
"Not" Write with No AC To Fault I ndicator peA
Fault LED pin A12J1-5.
WD
Write Data
II
D
./i'
GDT Ground Data 4
WEN Write Enable
H
E
WENT Write Enable Toggle R
WFfF[
"Not" Write with Access Not
1/
To Fault Indicator PCA
Ready Fault LED
pin A 12J1-4.
II
To Power and Motor
+5VRS +5V Remote Sense 18
RegulatorPCA pinA9J1-26.
Source from +5V supply.
• WHEN DSU IS INSTALLED, SLOTS A1 AND A2 CONTAIN HEAD
DENOTES SIGNAL SOURCE
ALIGNMENT PCA AND I/O SECTOR PCA, RESPECTIVELY.
A-72