Table of Contents
Advertisement
Troubleshooting
To test the hard disk drive voltages
To test the hard disk drive voltages
Refer to chapter 6, "Replacing Assemblies," for instructions to remove or replace covers and
assemblies.
-W-A-R-N-I-N-G---- This procedure
is
to be performed by service-trained personnel aware of the hazards
_ _ _ _ _ _ _ _ involved, such as fire and electrical shock.
Equipment Required
Equipment
Digitizing Dscilloscope
Critical Specification
> 100 MHz Bandwidth
Recommended
ModellPart
HP 54600A
1
Turn
off the instrument, then remove the power cable. Remove the instrument cover
and the disk drive assembly.
2 Remove the two locking pins from the top of the power supply. Slide the CPU board
out of the instrument enough to access Jl2 on the outer edge of the CPU board.
3 Connect the power cable, then turn on the instrument.
4
In the Sys PV menu select the Disk test. Select Run-Repetitive.
5 Check for the following voltages and signals at JI2 on the CPU board using an
oscilloscope.
Disk Drive Voltages
Pin No.
Signal
Voltage
Pin No.
Signal
Vonage
Pin No.
Signal
Voltage
1
RESET
27
IDRDY
34
PDIAG
3 - 18
DATA
28
CSEL
35
DAOO
20
KEY
29
DMACK
36
DA02
21
DMARQ
31
iNTRQ
37
CSO
23
DlDW
32
IDCS16
38
CS1
25
DIDR
33
DAOl
39
DASP
41
+5V Logic
PWR
42
+5V Motor
PWR
44
(Resv)
Pins 2,19,22,
24, 26, 30, 40,
43 are
GRDUND
5-30
Advertisement
Table of Contents
