HP Deskjet 9800 User manual

HP 9800 Computers
98750 CE Handbook
Part No. 98750-90039
E0982
Requires Binder No. 9282-0683
Flin- HEWLETT
a:~ PACKARD
Printed in US.A
First Edition, September 1982

98750 CE Handbook
© Copyright Hewlett-Packard Company, 1982
This document refers to proprietary computer software which is protected by copyright
All rights are reserved. Copying orotherreproduction ofthis programexcept for archival
purposes is prohibited without the prior written consent
01 Hewlett-Packard Company
Hewlett-Packard Company
3404 East Harmony Road, Fort Collins, Colorado 80525

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98750 Product Information 1-1
Chapter 1
Product Information
CRT Display Specifications
Screen Size:
Refresh Rate:
CRT Phosphor:
Alpha Raster:
Character Size:
Screen Capacity:
Graphics Raster:
261 mm x
193 mm (10.3 x 7.6 inches)
60Hz
P31
236 mm x 123 mm (9.3 x 4.84 inches)
2.3 mm x 2.95 mm (.09 x .116 inches)
24 lines of 80 characters
200 mm x 162.5 mm (7.9 x 6.4 inches)
Options and Configurations
The 98750A is available as an integral part of the 9845B #lxx. See the 9845B Base CE
Handbook Chapter for option information.
09845-92030
09845-93050
09845-92005
Related Documentation
Service Manual
Monochromatic Graphics Programming Manual
Owner's and System Exerciser Manual
Product Support Package
The 98750A service tools are included in the 9845B Product Support Package. Refer to the
9845B CE Handbook Chapter.
Safety
WARNING
LETHAL VOLTAGES ARE PRESENT INSIDE THE 98750A. RE-
FER TO THE GENERAL SAFETY GUIDELINES IN THE 98458
SERVICE MANUAL.

1-2 98750 Product Information

98750 Environmental/Installation/PM 2-1
Chapter 2
Environmental/Installation!
Preventive Maintenance
Installation
After unpacking the computer, the CRT assembly must be mounted onto the mainframe
assembly. The CRT assembly
will lock into place on top of the mainframe support legs. It is
important that the gUides on the CRT assembly and the mainframe support legs are aligned
properly before assembly. Figure 2-1 shows the proper alignment necessary for
the CRT
assembly installation. Notice how the buttons on bottom of the CRT assembly align with the
notches in the support legs.
Figure 2-1. CRT Assembly Installation

2-2 98750 Environmentalilnstallation/PM
Preventive Maintenance
Clean the case parts and tube face occasionally with mild soap and water or alcohol. Do not use
harsh, abrasive,
or other general purpose cleaners.

Base Configuration
98750 Configuration 3-1
Chapter 3
Configuration
The following assemblies must be installed in the 9845B base to support the98750A.
09845-65517
1818-0831
and 1818-0835
09845-66503
Graphics ROM
Mainframe ROM for Graphics ROM
Mainframe ROM for Graphics ROM
Alpha Control Assembly
Refer tothe 9845BBase CE Handbook Chapter for the locations of these parts.
Interfacing
The 98750A interfaces to the 9845B base via the Alpha Control Assembly (09845-66503) and
the Graphics Interface Assembly (09845-66504). Alpha information is stored in block 0 read-
write memory, and
is refreshed to the display via the IDA bus. Graphics information is transfer-
red via the 110 bus to the display, where it is interpreted and entered into the display memory.

3-2 98750 Configuration
Status Word
The Status Word may be obtained by executing the following instructions:
STATUS 13 iA
DISP A
The result is a decimal integer which may be converted to binary and interpreted as shown
below.
4 o
1101011101010010
LID Bit
'-------1/0 Status Bit

Check
Is the base operating?
(Try PRINTER
IS 0
PRINT
"HELLO")
Is there any display?
Adjust intensity control.
Press control-stop.
Is there a cursor?
Press A76 Test Button.
Does a raster
appear?
Initial Checks
98750 Troubleshooting 4-1
Chapter 4
Troubleshooting
Action
Yes - Proceed with Initial Checks.
No -Fix base.
Yes - Proceed to Diagnostics.
No -
Proceed with Initial Checks.
Yes -
Proceed to Diagnostics.
No -
Proceed with Initial Checks.
Yes -Fault
in Base.Motherboard.A72
No -Fault
in A73.A74.A75.CRTlYoke

4-2 98750 Troubleshooting

Test Summary
98750 Diagnostics 5-1
Chapter 5
Diagnostics
The CRT Tests are contained on the 9845B Test Binary Cartridge or the 9845A Test ROM. For
the 9845B, insert the cartridge,
and enter:
LOADBIN "TBIN"
For the 9845A. install the Test ROM and turn power on.
Press kO for the CRT alpha tests or k5 for the CRT Graphics tests. Follow the instructions for
each test. as follows.
KO CRT Alpha Test
This test will check and exercise all the CRT alpha functions and provide test patterns for the
following CRT adjustments:
• Focus
• Alpha raster size
The adjustment procedures are found after this test procedure.
Ta exit this test press (
STOP).
Press CJLJ; the CRT displays:
Press B For full buffer
H For He He
L For Linearit~'
G Graphics
C For Character Set
o For Optional Char. Set
F For Features

5-2 98750 Diagnostics
Press CD ;the CRT displays:
A failure
on ths display indicates a probable A 73 assembly failure.
Press o=J ;the CRT displays:
Usc th:s patte!'n to adjust the focus:ng adjustment (desc!':bed after th:s test) unt:! the "H"
characters are sharp and clear. The focus control is on the A 75 assembly.

98750 Diagnostics 5-3
Press CJ::J; the CRT displays:
Press o:J : if the graphics option is installed, a full screen graphics cursor is displayed and the
computer is in the graphics mode. See the Graphics section for details.
Press ( STOP) to exit the graphics test and return to the CRT Alpha Test.
If the graphics option is not installed, the G key will be ignored.
Press o:J :the CRT displays:

5-4 98750 Diagnostics
The character set is repeated five times. This test exercises all the CRT features. If the pattern is
deformed, the A 73 assembly may be defective.
Press o:J ; the CRT displays the optional characters if the option ROM is installed. When the
option ROM
is not installed the CRT shows:
-
111111111111111111111111111111111111111111111111111111111111111111111111111111
111111111111111111111111111111111111111111111111111111111111111111111111111111
'1111111111111111111111111111111111111111111111111111111111011111111111111111.
111111111111111111111111111111111111111111111111111111111111111111111111111111
111111111111111111111111111111111111111111111111111111111111111111111111111111
Press CO; all the CRT display features can now be checked. The CRT displays:
PRESS CONTINUE
Press (CONTINUE) 15 times, noting each time the feature being displayed. The features are shown
in the folloWing order.
inverse video
normal blinking video
normal video underlined
normal video with cursor
blinking inverse video
underlined inverse video
inverse video with cursor
blinking inverse video underlined
inverse video with underline
and cursor
blinking inverse video with cursor
blinking inverse video with underline
and cursor
blinking video
and underline
blinking video
and and cursor
blinkinq video cursor
and underline
normal video cursor
and underline

98750 Diagnostics 5-5
K5 CRT Graphics Test
This test checks the 32k-byte graphics memory and tests all the CRT graphics commands.
Press L..&J, the graphics memory test runs automatically. The test lasts about one minute. To
exit the graphics memory test before it is completed, press (CONTINUE). Errors in the graphics
memory test are displayed, for example:
G RA PH! CS (octal address) HAS (octal patern) NOT (octal pattern)
When the graphics memory test is completed manual control of the cursor and display is
enabled. Here is a description of the control features and the key to press for each feature.
~ Moves the cursor to the left.
~ Moves the cursor to the right.
(=cJ Moves the cursor up.
CIJ Moves the cursor down.
CD
CO
CD
CD
CD
Note
Pressing the above keys once moves the cursor one step. Pressing
the keys all the way down moves the cursor ten steps at a time.
A box outlining the graphics raster is displayed.
Causes three different cursors to appear. One type is displayed each time CI:J is
pressed. Press CI:J three times to view the cursors listed below.
The alpha cursor
(-).
The graphics cursor (+ ).
The full screen graphics cursor.
Clears the display. Pressing (
SHIFT) at the same time clears the display faster.
Fills the entire display with dots.
Displays grid referenced from the current
X, Y position of the cursor.
Causes any function being performed to loop or be performed continuously until
CD is pressed again.
Displays the cursor position
on the display and the corresponding position in memory.
To continue press
another key.
Random pattern check.
Skip a particular test. (exits the graphics test)
Exits the graphics memory test.
Begins the graphics
memory test.
Walking bit test.
Places the cursor in the center of the display. ( SHIFT) (I) moves the cursor off the
display.
Press any key to continue after an error occurs.
To exit the test, press (
STOP) once to stop the operation then press ( STOP) again to exit the
graphics test.
I

5-6 98750 Diagnostics

CRT Display Focus
98750 Adjustments 6-1
Chapter 6
Adjustments
The focus should be checked whenever the A7S or the CRT/yoke assembly has been changed.
The focus control
is located on the A75 assembly inside the high voltage cage. Remove the
CRT top cover and the high voltage cage cover to access the A75 assembly (see Figure 6-1).
Display a
full raster pattern of characters; the test ROM CRT alpha test will provide these
patterns. Adjust the focus control to sharpen the appearance of the displayed characters.
It may
not be possible to focus
all areas of the display at a particular control setting; in this case, the
focus control should be set at the point that gives the best overall display appearance.
CRT Intensity
The intensity should be checked whenever the A75 or the CRT/yoke assembly has been
changed.
The intensity control
is located on the A75 assembly inside the high voltage cage. Remove the
CRT top cover and the high voltage cage cover to access the A75 assembly (see Figure 6-1).
To adjust the CRT intensity, use the following procedure.
1. Advance the A75 intensity control and the operator's intensity control on the lower right
corner of the CRT bezel to maximum intensity.
2. With both controls at maximum settings, horizontal retraces should appear on the CRT.
Adjust the A75 intensity control until the retraces are no longer visible.
3. Press the CRT test button and notice the intensity of the full raster display.
4. Use the A75 intensity control to reduce this intensity by approximately 1fz. This control
setting
is between l/s and 1/4 of a turn less on the A75 intensity control.
5. Adjust the operator's intensity control
for the desired intensity.
6. Reassemble the computer.
CRT Alpha Raster Size
The alpha raster size should be checked whenever one of the CRT section assemblies has been
changed. To adjust the alpha raster, use this procedure.
• Remove the CRT top cover.
• Press the CRT test button on the A73 assembly, shown in Figure 6-1, to display the alpha
raster
in inverse video.
• Use the alpha width and alpha height controls on the A74 assembly to adjust the edges of
the inverse video. Use the raster dimensions given
in the Specifications in Chapter 1.

6-2 98750 Adjustments
CRT Graphics Raster Size
To adjust the graphics raster use this procedure:
• Remove the CRT top cover.
• Install the test binary cartridge and switch the power switch to on.
• Answer the questions and press k5 when its time to select a function key.
• Use the graphic width and graphic height controls on the A74 assembly to align the edges
of the inverse video to the graphics raster outline on the CRT alignment mask. Use the
raster dimensions given in the specifications
in chapter 1.
Display Logic
CRT Test
Graphics Height Control
A7409845-66574
CRr Analog
A7509845-66575
High Voltage Assembly
A7609845-66576
Interconnect Assembl
(Located On Bottom
Side Of A71 Assembly)
Figure 6-1
High Voltage Cage
A 71 09845-66571
CRT Motherboard
A77 09845-66577
Graphics Scanner
CRT Yoke'
A76 09845-66576
Interconnect Assembly
(Located On Bottom
Side Of A71 Assembly)
A7909845-66579
GraphiCS Memory
CRT Bottle'
CRT Bezel
'CRT and Yoke are one
Assembly (09845-67160)