HP 4 Plus Manual

							Message DisplayedMeaning
W1 \fM\bGE \bD\bPT
MEMORY LOW, P\bGE
S\fMPL\fF\fED The printer received a graphics print file that was too
complex to print at the requested resolution. The printer
automatically processed the file in the highest resolution
possible with the memory installed. Add additional memory
to print the file at full resolution. Check the printout for loss
of data or print quality.
W2 \fNV\bL\fD PERS
REQUESTED L\bNGU\bGE
NOT \bV\b\fL\bBLE The job was not printed because the requested personality,
such as PostScript, was not installed. Install the language in
which the files are sent, together with enough memory to
support that language.
W3 JOB \bBORTED
\fNSUFF\fC\fENT MEMORY
JOB CLE\bRED The printer was forced to abort the print job because there
was not enough installed memory to support the printer
language used. 
W4 JOB 300/OFF
W5 JOB 300/LTR
W6 JOB 300/\b4
W7 JOB 300/LGL The job was printed at 300 dpi with page protection set as
specified in the message. To print the job as requested,
install additional memory.
W8 JOB 600/OFF
W9 JOB 600/LTR
W0 JOB 600/\b4 The job was printed at 600 dpi with page protection set as
specified in the message. To print the job as requested,
install additional memory.
WM MEM CNF\fG N/\b
MEMORY SETT\fNGS
CH\bNGED The printer did not have enough memory when switched on
to support the previous settings for I/O buffering and /or
Resource Saving, probably because you removed a
memory SIMM, added a new personality SIMM, or added
the optional duplex unit.  
WM CHK MEM CNF\fG
MEMORY SETT\fNGS
CH\bNGED I/O Buffering and /or Resource Saving settings were altered
when the printer was switched on because the printer did
not have enough memory. This usually occurs after memory
has been removed from the printer. (You can check settings
by printing a self test.)
WM [personality]
MEM FULL
[personality]
MEMORY FULL The Resource Saving memory area for the specified
personality is full. Press 
[CONTINUE]* to continue printing
(some data will be lost). The current job will print, but some
resources (downloaded fonts, etc.) may not be saved. If this
error occurs frequently, you may need to adjust Resource
Saving settings.
*Press   Go  on the LJ5. 
Table 7-2
Clearable Warning Messages            
Troubleshooting 7-11 
						

							Printer Message Troubleshooting
Procedures
When the following procedures require removing and replacing
an assembly or PCA, refer to the applicable section in Chapter 6
for instructions.
Blank Display
ChecksAction
Is the power on?1.
2. Check the ON/OFF switch and verify the power is
plugged in. 
Press a Control Panel key to verify problem still
exists.
Is the fan working? 1.
2. If the fan is working, check the cabling to the
Control Panel. If the cabling is good, replace the
Formatter first, then the Control Panel.
If the fan is NOT working,  measure the DC
voltage levels (refer to Table 7-39). If the voltage
levels are good from the power supply to the DC
Controller and the fan is not working, replace the
DC Controller. If the voltage levels are not present
at TB1, replace the DC Power Supply.
Table 7-3Blank Display
7-12 Troubleshooting 
						

							MP/PC/LC (Tray 1/2/3) LOAD Message    
The conditions that result in MP/PC/LC LO\bD or (TR\bY 1/2/3 )
messages are: 
•The absence of any input tray.
•The absence of media in either tray.
•The tray size switches may be defective and not recognize
the presence of the paper tray. The tray is sensed as the
tray-identifier tabs contact one or more of the three tray
identifier microswitches. 
•The Universal Tray paper size dial setting does not match
the installed paper.
The MP/PC/LC LO\bD  message is also generated when the user or
software requests a paper size other than that installed.
The Paper Sensing Arms are located in the paper input areas of
the printer. During normal operation, the Paper Sensing Arm
flags rest on the media installed in the paper tray. The Sensing
Arm flags are attached to shafts. The opposite end of the shaft is
a photointerrupter that rotates through the sensors on the Paper
Control PCA. These sensors are:
•PS4 Paper out-MP tray.
•PS2 Paper out-PC tray.
•PS6 Paper out-Lower Cassette.
•PS7 Paper out-Envelope Feeder.
The presence of paper in the paper tray is sensed by the paper
sensor arm. When paper is in the cassette, the sensor arm rests
on top of the paper in the tray. At this point, the sensors are not
blocked. When the tray is empty, the arm swings through its
travel. The photointerrupter attached to the paper sensor arm
shaft rotates and blocks the sensor diode.  
Troubleshooting 7-13 
						

							ChecksAction
Is media present in the tray(s). Install media.
Are the proper trays fully inserted in the
printer? Reseat the cassettes. Make sure each
cassette is fully seated into the printer.
Ensure that the Universal Paper tray
selector knob setting matches the
installed paper.
Does the Control Panel ’s or application ’s
Paper size setting match the tray being
used? Correct the setting to match tray.
Is the expected tray size being
recognized by the printer? Ensure that the image is sized correctly
(formatted) for the paper size selected.
Proceed to the following cassette size
switches functional check.  Check
switches 603/4/5 if feeding from the PC
tray (Tray 1). Check switches 851/2/3 if
feeding from the Lower Cassette. see
Figures 7-14 and 7-15 for locations.) 
Are any of the tray identifier tabs broken
on either PC (Tray 1) or LC (Tray 2)
paper tray? Inspect the tray for damage. If damaged,
replace the tray.
Table 7-4“
MP/PC/LC (Tray 1/2/3) LOAD ” Message Checks 
7-14 Troubleshooting 
						

							Cassette Size Switches (SW603, SW604, SW605) Functional
Check       
Before beginning this test, remove the Lower Cassette Base and
the Envelope Feeder. Also, PS2 (PC or Tray 2 Paper Out sensor)
must be engaged for this test to be performed reliably. Push PS2
up towards the rear of the printer with your hand.
1Power ON the printer with the PC tray removed. Wait for the
PC LO\bD XXX message. Set  P\bPER=LETTER in the Printing Menu
using the Control Panel.
2With PS2 engaged, press and hold the lower and upper paper
size switches (refer to Table 7-5). The display should read  00
RE\bDY . If the display does not change, the switches are
defective. Inspect the switch activating mechanism and/or
replace the Paper Control PCA.
3Repeat the test, this time setting the paper size to legal
( P\bPER=LEG\bL ) and pressing the top two switches.  If the
printer responds with  00 RE\bDY, all three switches have been
tested and verified.
Note The LaserJet 5 printer will require you to set the
paper size, followed by a self test to generate the
equivalent 
TR\bY 2 LO\bD  message.  Use the  Job
Cancel  key between tests to cancel the Self Test
printout.
Figure 7-1 PC Tray Size Sensing Microswitches Location
Troubleshooting 7-15 
						

							Paper Size Sensing Lower Cassette  
The operator must set the appropriate paper size for the Lower
Cassette using a dial which, in turn, activates switches on the
cassette base.  This setting is sent to the DC Controller on the
serial data bus (SLI).  The printer posts a 41.3 SERV\fCE error if
the media is different from that selected with the switch. 
To verify proper operation of the LC (Tray 3) switches, lock out
the MP (Tray 1) and PC (Tray 2) trays (in the Config Menu) and
perform the same test with Lower Cassette switches as was done
for the PC tray (Tray 2) switches.
Cassette Cassette Size Sensing Switch
SW603/851      SW604/852      SW605/853 Upper     Middle      Lower
Legal ONONOFF
Letter ONOFF ON
A4 OFF OFF ON
Executive OFFONON
No Cassette OFFOFFOFF
Table 7-5Switch Logic for Cassette Size
7-16 Troubleshooting 
						

							PC Empty Sensor (PS2) Functional Check 
1Power on the printer with the PC tray (Tray 2) empty.
2After the 05 SELF TEST  and the 02 W\bRM\fNG UP  cycles, the PC
LO\bD LETTER  (or \b4 )  or  TR\bY 2 EMPTY  message appears.
3Add paper to the PC tray and re-install the tray.
4The display should read  02 W\bRM\fNG UP, then 00 RE\bDY .  \ff
the PC LO\bD  or TR\bY 2 EMPTY  message persists, replace PS2.
PS4 Check (MP Tray Empty Sensor)
    
1With the printer powered ON and  00 RE\bDY displayed, select
the Config Menu from the Control Panel.
2Configure the MP Tray (Tray 1) as a cassette ( MP TR\bY=C\bSS
or TR\bY 1=C\bSSETTE ).
3Lock out the remaining paper trays ( LOCK= PC LC or LOCK
TR\bY= 2 3 ).
4Remove any paper from the MP Tray (Tray 1).  The printer
should display an  MP LO\bD [paper size]  message.  For the
LaserJet 5 printer, run a Self Test to generate the  TR\bY 1
LO\bD  message.
5Insert paper into the MP Tray (Tray 1).  If the  MP LO\bD (TR\bY
1 LO\bD )  message persists (or if the load message never
occurred), PS4 or the sensor flag is defective.
Troubleshooting 7-17 
						

							12 Printer Open Message 
The 12 PR\fNTER OPEN (or CLOSE PR\fNTER COVER )  display tells the
operator to close the printer ’s top cover. The DC Controller
detects the Printer Open condition through the position of
SW601, which is located on the Paper Feed Assembly PCA . A tab
underneath the top cover Door engages SW601 through a slot in
the Top Cover Assembly. 
In addition to signaling that the top cover is open, SW601 enables
the +24B VDC which controls the high voltage for the printing
processes, and the AC Voltage for the Fuser Assembly. 
Checks Action
Is the Top Cover Assembly open? Ensure the Top Cover Assembly is firmly
closed, and that the protrusion that
engages the switch actuator is not
broken.
With the top cover open, check that the
switch actuator does engage the switch. Use a slim object to manually engage
SW601. Listen for a definite 
“click ” as the
switch is engaged (see Figures 7-2 and
7-14).
Has the Paper Control PCA on the Paper
Feed Assembly been replaced? SW601 has an actuator that  can be
deleted during reassembly. Ensure that
this actuator is installed correctly. 
Is the DC Controller PCA defective? Measure the 24 VDC on J201, pins 8 and 9 on the DC Controller (see Figures 7-16
and 7-17 for locations). If this 24 volts
toggles as SW601 is activated, replace
the DC Controller. If it does not, replace
the Paper Control PCA or the cable. Also
check J201-6 (DOPEN). This voltage
should be 5 VDC when the printer is
open, and 0 when the printer is closed. If
not, replace the DC Controller PCA.
Table 7-612 PRINTER OPEN Checks
7-18 Troubleshooting 
						

							SW601 Functional Check 
1Open the Top Cover Assembly.
2The message 12 PR\fNTER OPEN  (or CLOSE PR\fNTER COVER )
should appear.
3Close the top cover. The  02 W\bRM\fNG UP message should
appear.
4If the messages do not occur, check the switch actuator (see
Figure 7-2, callout 1) on the top cover, and check that the
plunger that covers the switch is in place (see also Figure 7-14
for switch locations).
5Replace the Paper Control PCA.
Figure 7-2 Location of the Top Cover Closed (SW601) Actuator
Troubleshooting 7-19 
						

							13 PAPER JAM Message       
Paper jams occur when paper fails to arrive at or clear the paper
path sensors in the allotted time.  Paper movement is monitored
primarily by two paper sensors. These are described below and
illustrated in Figure 7-3).
1PS1, the Input/Registration Sensor, located in the Paper Feed
Assembly.
2PS3, Exit Sensor, monitors paper in the Fuser Assembly.
When troubleshooting paper jams, the door associated with the
sensor must be opened and closed to clear the jam message.  For
instance, if PS3 (Exit Sensor) detected the paper jam, and the jam
was cleared through a method other than opening the rear door,
the message remains in the display until the rear door is opened
and closed.  Likewise, the top cover must be opened before a jam
detected by PS1 is cleared.
The DC Controller monitors these sensors, and detects both the
leading and trailing edge of the paper to verify that the paper
clears the sensors in the allotted time. If the paper does not
arrive at, or clear the sensors in the allotted time, the DC
Controller senses a paper jam. The paper jam information is
transferred to the Formatter PCA, which displays the  13 P\bPER
J\bM  message.
Note also that if PS5 (MP Tray or Tray 1) Paper End Sensor on
the Sensor PCA is bad (Figure 7-3, item 3), a paper jam will be
reported when paper is fed from the MP Tray (or Tray 1).
Figure 7-3 PS1 and PS3  (Paper Path Sensors) & PS5 Paper End Sensor
7-20 Troubleshooting