IBM ValuePoint 6472 Owner's manual

ValuePoint
Hardware Maintenance
Manual Supplement
April 1994
Types 6472, 6482, 6484, 6492, and 6494
This package contains a supplement to the IBM
PS/ValuePoint Hardware Maintenance Manual (part
number 71G5388, form number S61G-1423-01).
Insert this package in the back of the manual. (Align
the pages in the manual, then press the pages into
place with your fingers.)
IBM, ValuePoint, and PS/ValuePoint are trademarks of the
International Business Machines Corporation.
 Copyright International Business Machines Corporation
1994. All rights reserved. Note to U.S. Government
users–Documentation related to Restricted rights–Use,
duplication, or disclosure is subject to restrictions set forth
in the GSA ADP Schedule Contract with IBM Corp.
Part Number 83G7790
Form Number S83G-7790-00

Model 64XX Service Information
This supplement contains a general checkout and
diagnostic test procedure, a Symptom-to-FRU Index,
procedures for isolating problems to a FRU, a parts
catalog, system specifications, a system board layout,
exploded views, and a 64XX computer features table for
the IBM* ValuePoint* Models 6472, 6482, 6484, 6492, and
6494.
The diagnostic tests in this manual are intended to test
only 64XX ValuePoint products. Other products, prototype
cards, or modified options can give false errors and invalid
computer responses.
Important
Use the ValuePoint Advanced Diagnostics
Diskette Type 5 for all models in this supplement.
For systems preloaded with Windows**,
QAPlus/WIN** for ValuePoint is available in the
Windows environment as an additional diagnostic
aid.
Call 1-800-772-2227 for the latest BIOS level for
the system you are servicing.
Before Replacing 64XX System Boards
For all 64XX models, the processor is a separate FRU
from the system board; the processor is not included with
the system board FRU.
If you are instructed to replace the system board, do the
following:
1. Install the processor from the old system board on the
new system board.
2. If any of the following options are on the old system
board, install them on the new system board.
external cache memory and cache tag RAM
memory modules
extended video memory
3. Ensure that all the new system board jumper settings
match the old system board jumper settings.
If the new system board does not correct the problem,
reinstall the options on the old system board, reinstall the
old system board, then replace the processor.
*Trademark of the IBM Corporation.
** Trademark of the MicroSoft Corporation.
** Trademark of DiagSoft Inc.
 Copyright IBM Corp. 1994 1

How to Install 64XX Processors
Install all model 64XX processors with the bevelled corner
located at the front-left corner of the processor socket.
Important
If the processor is not installed correctly, the system
board and the processor will be damaged.
How to Diagnose 64XX system boards with
486DX4 Processors
The 486DX4 processor FRU consists of the processor and
a voltage regulator. If you are instructed to replace the
system board, first check for 3.5 V dc between pin 1 and
pin 19 on the regulator board.
19
Processor
1
1. If the voltage is correct (approximately 3.5 V dc)
replace the system board.
2. If the voltage is incorrect, replace the processor FRU.
The general checkout procedure starts on the next page.
2ValuePoint HMM - April 1994

General Checkout
001
– Power-off the computer and all external devices.
– Check all cables and power cords.
– Make sure there are no diskettes in the drives.
– Power-on all external devices.
– Power-on the computer.
Note: You can press Esc to speed through the
memory count when the system is first powered
on.
– Watch the screen for a POST error message.
DID YOU RECEIVE A POST ERROR MESSAGE?
Yes No
002
Go to Step 008.
003
IS THE ERROR 162?
Yes No
004
If you remove or install memory, a 164 error is
displayed. Follow the instructions on the screen.
Otherwise, go to “Symptom-to-FRU Index” on
page 12 in this supplement. If that does not solve
the problem, go to Step 008.
005
HAS THE CONFIGURATION BEEN INTENTIONALLY
CHANGED?
Yes No
006
Go to Step 008.
007
Press Enter to run the Configuration Utility program and
verify that the error is no longer present. If you return to
this point again, go to Step 008.
008
– Insert your diagnostics diskette.
– Press Ctrl+Alt+Del.
(Step 008 continues)
Model 64XX Service Information 3

(CONTINUED)
008 (continued)
DID THE COMPUTER BOOT FROM THE DIAGNOSTIC
DISKETTE AND DID THE IBM HARDWARE
DIAGNOSTIC LOGO SCREEN APPEAR?
Yes No
009
Go to “Symptom-to-FRU Index” on page 12 in this
supplement.
010
– Select Test the System.
– Press Enter.
– If you need to create a formatted test diskette for this
test, press Y, press Enter, then follow the instructions
on the screen.
Otherwise, press N, press Enter, then go to Step 011.
011
IS THE INSTALLED DEVICES LIST CORRECT?
Yes No
012
Press N, then press Enter. Go to “Installed Devices
List” on page 8 in this supplement. If that does not
resolve the problem, continue with Step 016 on
page 5.
013
– Press Y, then press Enter
DID THE “SYSTEM CHECKOUT” MENU APPEAR?
Yes No
014
Go to “Symptom-to-FRU Index” on page 12 in this
supplement.
015
– Run the diagnostics tests.
If the test stops and you cannot continue, replace
the last device tested.
If the computer has incorrect keyboard responses,
go to “Keyboard” on page 9 in the PS/ValuePoint
Hardware Maintenance Manual .
If the printer has incorrect responses, go to
“Printer” on page 9 in the PS/ValuePoint Hardware
Maintenance Manual .
If the display has problems such as jittering, rolling,
shifting, or being out-of-focus, go to “Display” on
page 7 in this supplement.
4ValuePoint HMM - April 1994

DID THE TESTS IDENTIFY A FAILURE?
Note: If the test stops and you cannot continue, replace
the last device tested.
Yes No
016
Check the “Symptom-to-FRU Index” on page 12 in
this supplement for any POST error or other error
symptom you might have. If your error symptom is
not listed, go to “Undetermined Problem” on page 6
in this supplement. If you cannot find a problem, it
might be intermittent:
Check for damaged cables and connectors.
Reseat all adapters, drives, and modules.
Check the system unit fan for proper operation.
Start an error log and run the tests multiple
times (see “Error Log” on page 42 in this
supplement).
017
Follow the instructions on the display. If that does not
correct the problem, go to “Symptom-to-FRU Index” on
page 12 in this supplement.
Model 64XX Service Information 5

Undetermined Problem
Check the power supply voltages (see “Power Supply” on
page 6 in the PS/ValuePoint Hardware Maintenance
Manual ). If the voltages are correct, return here and
continue with the following steps:
1. Power-off the computer.
2. Remove or disconnect the following, one at a time:
a. Non-IBM devices
b. External devices (modem, printer, or mouse)
c. Math coprocessor
d. Any adapters
e. Riser card
f. Memory modules (see “Computer Memory” on
page 11 in this supplement).
g. Extended video memory
h. External Cache
i. External Cache tag RAM
j. Hard disk drive
k. Diskette drive
3. Power-on the computer to re-test the system.
4. Repeat steps 1 through 3 until you find the failing
device or adapter.
If all devices and adapters have been removed, and the
problem continues, replace the system board (see “Before
Replacing 64XX System Boards” on page 1 in this
supplement).
6ValuePoint HMM - April 1994

Display
If the screen is rolling, replace the display assembly. If
that does not correct the problem, replace the system
board.
If the screen is not rolling, do the following to run the
display self-test:
Note: The following test does not work on all ValuePoint
displays. If the test does not work, but you suspect
the display, replace it. If that does not solve the
problem, reinstall the original display, then replace
the system board.
1. Power-off the computer and display.
2. Disconnect the display signal cable.
3. Power-on the display.
4. Turn the brightness and contrast controls to their
maximum setting.
5. Check for the following conditions:
You should be able to vary the screen intensity
by adjusting the contrast and brightness controls.
The screen should be white or light gray, with a
black margin (test margin) on the screen.
Note: The location of the test margin varies
with the type of display. The test margin
might be on the top, bottom, or one or
both sides.
If you do not see any test margin on the screen,
replace the display. If there is a test margin on the
screen, replace the system board.
Note: During the first two or three seconds after the
display is powered on, the following might
occur while the display synchronizes with the
computer.
Unusual patterns or characters
Static, crackling, or clicking sounds
A “power-on hum” on larger displays
A noticeable odor might occur on new
displays or displays recently removed from
storage.
These sounds, display patterns, and odors are
normal; do not replace any parts.
If you are unable to correct the problem, go to
“Undetermined Problem” on page 6 in this
supplement.
Model 64XX Service Information 7

Installed Devices List
Follow the instructions on the screen for the installed
devices list.
Warning: A customized setup configuration (other than
default settings) might exist on the computer you are
servicing. Running the Configuration Utility program might
alter those settings. Note the current configuration settings
and verify that the settings are in place when service is
complete.
If the number of diskette drives shown in the installed
devices list is not correct , do the following:
1. Restart the computer.
2. Run the Configuration Utility program to correct the
drive information (see “Diagnostics and Test
Information” on page 32 in this supplement).
3. Run the diagnostic tests.
If you cannot correct the drive information, replace FRUs,
in the following order, until the problem goes away:
Diskette drive
Diskette-drive cable
System board
If the number of hard disk drives shown in the installed
devices list is not correct , do the following:
1. Check the hard disk drive jumper settings (see “Hard
Disk Drive Jumper Settings” on page 44 in this
supplement).
2. Check the voltages to the hard disk drives (see
“Power Supply” on page 6 in the PS/ValuePoint
Hardware Maintenance Manual ).
3. Restart the computer and check the configuration.
If the first drive is missing, replace the primary
drive.
If any other drive is missing, replace that drive.
If all drives are missing, replace the primary
drive.
If the problem remains, replace the drive cable. If
that does not fix the problem, replace the system
board.
If any other adapter or device is missing from the installed
devices list, run the Configuration Utility program (see
“Diagnostics and Test Information” on page 32 in this
supplement). Check to see if any adapter or device is set
to a conflicting address with any other adapter or device.
Also be sure that any adapter or device missing from the
list is not set to “disabled.”
Note: If the device is still missing from the list, run the
diagnostics provided with that device. Devices
missing from a model 64XX installed devices list
cannot be added to the list.
8ValuePoint HMM - April 1994