HP Integral Personal Computer Service Manual page 129

.... 8 Troubl . . hootlng end DletplOatica
Ta .... 8-14. Printer Power-On Dialnostlcs
Use the following procedure to completely evaluate the operation of the built-in ink-jet printer. In
each of these steps, always turn off the power before you connect or disconnect a cable, or replace a
component.
Note: If you need to troubleshoot the printer control circuitry on the logic B PCA, prepare
the computer as desaibed in table 8-27.
Step
1. TUrn off the computer.
2. Install paper in the printer.
3. Remove the service ROM and reinstall the
operating system
ROM. The tests that follow
must be run with paper in the printer and
with the operating system installed.
4. 1brn on the power. Note the actions of the
carriage and the attention light (the yellow
LED in the switch panel). The normal
power-on sequence is:
a) The yellow LED blinks twice, then goes
out.
b) The carriage sweeps past the home-
switch position twice, then parks at the left
margin.
The printer fails to power up (the motors do not
move and the yellow LED does not blink).
The yellow LED fails
to
light, but the printhead
moves.
The yellow LED stays on continuously, indicating
an out-ot-paper condition.
I
Indloated Aotion
If the printer powers up correctly, go on to step
7 below.
If you observe any of the symptoms listed be-
low, take the indicated action. After you have
corrected the problem, repeat the power-on test,
then go on to step 7 below.
Verify the power supply (refer to table 8-3), then
check the printer control circuitry (refer to table
8-16).
Go to step 5 below.
If you have not installed paper in the printer,
turn off the power, install the paper, then repeat
step 4 from the beginning.
If there is paper in the printer, check the out-of-
paper switch and the printer control circuit
(refer to table 8-16).
The yellow
LED
continues blinking after power on. .
Troubleshoot the printer ROM, RAM, and CPU
(refer to table 8-17).
The yellow LED blinks twice, stays off for several
seconds, then resumes blinking.
The carriage motor fails to move, but the display
indicates that the power is on.
The printhead crashes to the left.
The problem may be: 1) a bad carriage motor, 2)
the mechanism will not allow the carriage to
move, 3) a failure in the printer control circuit,
or 4) a bad home switch. Go to step 6 below.
Go to step 6 below.
The problem may be: 1) a defective home
switch, 2) a binding in the mechanism, or 3) a
printer control circuit proble~. Go to table 8-16.