HP Laserjet 5 Service Manual

							A-12 Parts Index 
						

							B
Regulatory Information
Laser Safety (U.S.A.)
The Center for Devices and Radiological Health (CDRH) of the U.S. Food and
Drug Administration implemented regulations for laser products manufactured since
August 1, 1976. Compliance is mandatory for products marketed in the United
States.
This printer is certified as a “Class 1” laser product under the U.S. Department of
Health and Human Services (DHHS) Radiation Performance Standard according to
the Radiation Control for Health and Safety Act of 1968. Since radiation emitted
inside this printer is completely confined within protective housings and external
covers, the laser beam cannot escape during any phase of normal user operation.
WARNING!Never operate or service the printer with the protective cover removed from the
Laser/Scanner Assembly. The reflected beam, although invisible, can damage your
eyes.
Regulatory Information B-1 
						

							Laser Statement (Finland)
The following applies to printer operation and servicing in Finland.
LASERTURVALLISUUS
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
HP LaserJet(s) 4V and 4MV laserkirjoitin on käyttäjän kannalta turvallinen luokan
1 laserlaite. Normaalissa käytssä kirjoittimen suojakotelointi estää lasersäteen
pääsyn laitteen ulkopuolelle.
Kirjoittimen on hyväksynyt Suomessa laserturvallisuuden osalta Sähktarkastuskeskus. Laitteen
turvallisuusluokka on määritetty valtioneuvoston päätksen N:o 472/1985 ja standardin EN 60825
(1991) mukaisesti.
VAROITUS !  Laitteen käyttäminen muulla kuin käyttohjeessa mainitulla tavalla saattaa altistaa
käyttäjän turvallisuusluokan 1 ylittävälle näkymättmälle lasersäteilylle.
VARNING ! Om apparaten används på annat sätt än i bruksanvisning specificerats, kan användaren
utsättas fr osynlig laserstrålning, som “verskrider gränsen f”r laserklass 1.
HUOLTOHP LaserJet(s) 4M and 4MV kirjoittimen sisällä ei ole käyttäjän huollettavissa olevia
kohteita. Laitteen saa avata ja huoltaa ainoastaan sen huoltamiseen koulutettu henkil. Tällaiseksi
huoltotoimenpiteeksi ei katsota väriainekasetin vaihtamista, paperiradan puhdistusta tai muita käyttäjän
käsikirjassa lueteltuja, käyttäjän tehtäväksi tarkoitettuja ylläpitotoimia, jotka voidaan suorittaa ilman
erikoistykaluja.
VARO ! Mikäli kirjoittimen suojakotelo avataan, olet alttiina näkymättmälle lasersäteilylle laitteen
ollessa toiminnassa. Älä katso säteeseen.
VARNING !  Om laserprinterns skyddshlje “ppnas då apparaten är i funktion, utsättas användaren f”r
osynlig laserstrålning. Betrakta ej strålen.
Tiedot laitteessa käytettävän laserdiodin säteilyominaisuuksista:
Aallonpituus 777,795 nm
Teho 5 mW
Luokan 3B laser
B-2 Regulatory Information 
						

							Toner Safety
NoteIn case of toner spills, skin and clothing are best cleaned by removing as much toner
as possible with a dry tissue, then washing with cold water. Hot water causes toner
to permanently set into clothing.
MSDS Information
A Material Safety Data Sheet (MSDS) for toner or any other chemical used in the
printer is available through Hewlett-Packard’s Customer Information Center by
either mail or fax.
By mail:
To obtain an MSDS for the HP C3906A toner cartridges through the mail, call the
Customer Information Center (CIC) at 1-800-752-0900 between 6 A.M. and 5 P.M.
Pacific Standard Time.
By fax:
To obtain an MSDS for the HP C3906A toner cartridges by fax, call HP ASAP
(Automated Support Access Program) at 1-800-333-1917 and follow the
instructions for using the HP FIRST fax service.
NoteSee “Technical Assistance” in chapter one for more information on the HP FIRST
service.
Ozone Emission
These printers do not use high voltage corona wires in the electrophotographic
process, and therefore generate no measurable ozone gas (O
3). The printers instead
use charging rollers in the toner cartridge and in the print engine.
B
Regulatory
Information
Regulatory Information B-3 
						

							FCC Statement (Class B)
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
·Reorient or relocate the receiving antenna.
·Increase the separation between the equipment and the receiver.
·Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
·Consult the dealer or an experienced radio/TV technician for help. Any changes or
modifications not expressly approved by Hewlett-Packard could void the user’s
authority to operate this equipment.
NoteUse of a shielded interface cable is required to comply within the Class B limits in
Part 15 of FCC rules.
VCCI Statement (Japan)
The VCCI statement below is required in Japan. It is similar to the FCC regulatory
statement.
VCCI Statement (Japan)
Figure B-1
B-4 Regulatory Information 
						

							C
Service Notes
Fuser Accordian Jams
C3941A-01
SERVICE NOTE
SUPERSEDES: NONE
HP C3941A LaserJet 5L
Serial Numbers:
						

							To remove the paper jam the fuser area of the printer must be disassembled. Fusers
and pressure rollers should be checked for damage from the paper jam or the
customers attempts to remove the paper jam.
The output tray fin should be installed in all LaserJet 5L’s in the affected serial
number range that are returned for any service, paper jam or other.
Solution:
The out try fin (RB1-7332-000CN) should be placed in the output tray of the
printer. This will decrease the number of fuser paper jams customers are
experiencing. The fin should be installed in all printers that do not already have it.
See graphic for placement of the part.
ADMINISTRATIVE INFORMATION —————————————————
C-2 Service Notes 
						

							Fuser Jam Clearing Countermeasure
C3941A-02A
SERVICE NOTE
SUPERSEDES: C3941A-02
HP C3941A LaserJet 5L
Serial Numbers:
JPBK000000 / JPBK016388
JPBL000000 / JPBL055374
JPCW000000 / JPCW043448
JPVW000000 / JPVW081157
USCB000000 / USCB302011
JPBV000000 / JPBV010501
JPVV000000 / JPVV216255
CNVM000000 / CNVM175233
CNVN000000 / CNVN189964
LaserJet 5L Printer Fuser Jam Clearing Countermeasure
To Be Performed By:HP-Authorized Personnel
Parts required:RB1-7334-000CN JP (Jam Prevention) Protector
General Description:
When a paper jam occurs in the LaserJet 5L it will commonly occur in the fuser area,
with the paper folding accordion-style between the fuser and delivery assembly. The
paper jams in the fuser can be such that the customers cannot remove the paper and
the printer requires servicing. Customers attempting to clear the jams often cause
damage to the printer. This countermeasure will not prevent paper jams, but will
allow users to clear the paper jams without damaging the printer.
Continued
DATE 10 June 1996
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION RECOMMENDEDACTION IMMEDIATELY STANDARDS:
CATEGORY: ON SPECIFIED FAILURE LABOR: 0.5 Hours
AGREEABLE TIME
LOCATION CUSTOMER INSTALLABLE SERVICE RETURN USED RETURN
CATEGORY: ON-SITE INVENTORY: SCRAP PARTS: SCRAP
HP LOCATION SEE TEXT SEE TEXT
AVAILABILITY: PRODUCT’S SUPPORT LIFE RESPONSIBLE UNTIL: 10 May 1998
AUTHOR: SKL ENTITY: 4600 ADDITIONAL INFORMATION: Reissued to correct Figure A.
C
Service Notes
Service Notes C-3 
						

							To remove this type of paper jam the fuser area of the printer must be disassembled.
The fuser and pressure roller should be checked for damage from the paper jam or
the customer’s attempts to remove the paper jam. See chapter 6 in the service
manual for disassembly instructions.
This JP protector and the output tray fin (from service note C3941A-01) should be
installed in all LaserJet 5L’s in the affected serial number range that are being
serviced.
Solution:
This JP Protector (RB1-7334-000CN) should be added to the delivery assembly
(RG5-2012-000CN) of every printer in the affected serial number range that is
serviced. To install this part you must remove the delivery assembly, per the service
manual (page 6-13/14). The JP Protector is shown in Figure A below. The Delivery
Assembly is shown in Figure 8-10 of the Service manual. Install the JP Protector
into the Delivery Assembly in the position shown in Figure B below. Figure B
shows a right side view of the Delivery Assembly with the JP Protector installed.
Be very careful to orient the part correctly.
C-4 Service Notes 
						

							Index
A
AC power distribution  5-6
circuitry 5-6
accessories and supplies 8-5
acoustic emissions  1-6
assistance, technical  1-12
B
background scatter  7-16
black page  7-16
blank page
all pages  7-18
occasional 7-18
bottom assemblies
DC Controller  6-44
formatter PCA 6-47
memory door guide 6-42
motor 6-43
C
cable pinouts 7-30
cables
replaceable  8-6
capacities: output tray  1-3
caution messages 6-3
CDRH B-1
Center for Devices and Radiological
Health (CDRH) B-1
character voids  7-16
circuit protection 5-6
class 1 laser product B-1
class B digital device  B-4
cleaning
printer  4-6
spilled toner  4-8
clutches and sensors 5-17
common hardware 8-6
consumables
ordering 8-4
printer  1-10
control panel  1-3
described  5-9
features 1-3, 3-3
layout  3-3
messages  7-8
self test for printer errors  7-8
settings 5-9
using 3-3
covers 8-7
covers and doors  8-8
back cover 6-6
EP Door  6-8
main cover and paper input assembly
6-10
memory door 6-9
CPU 5-8
CPU, printer  5-8D
data light  3-3
DC Controller  8-16
diagram 7-6
DC Controller system  5-5
DC power distribution
circuitry 5-6
explained  5-6
defect ruler, repetitive image 7-28
delivery assembly  8-24
Department of Health and Human
Services (DHHS) B-1
DHHS B-1
diagrams 8-3
dimensions, printer  1-3, 1-6, 2-4
distribution system
AC 5-6
documentation
related 1-10 to 1-11
doors 8-7
DRAM
installation  6-5
dropouts  7-17
drum
photosensitive 5-13, 7-13, 7-22 to
7-23
drum cleaning process
described  5-12 to 5-13
drum conditioning
described  5-12 to 5-13
drum rotation functional check  7-23
E
EconoMode  1-3, 5-10
print speed  5-10
vs. normal mode  5-10
electrical specifications 1-6
emissions
acoustic 1-6
engine test 3-10, 7-21
printing  7-21
engine test button location 7-21
engine test microswitch, SW201  5-5
environment
operating  2-3
environmental requirements  2-5
error light 3-3
unclearable 7-9
exchange program 1-10
F
faded print  7-14
faulty image examples  7-14
FCC statement B-4
features
control panel  1-3, 3-3
feed assembly  8-20
Finland laser statement B-2fonts
downloaded  5-6
internal 1-3
internal character sets 5-8
storing  5-8
fonts, internal 1-3
form feed light 3-4 to 3-5
formatter PCA 8-16
Motorala 68030 microprocessor 5-8
Bi-tronics interface  5-8
DC controller PCA 5-19
described  5-8
engine test print  3-10
HVPS PCA 5-7
REt 5-9
self test bypass 5-5
voltages  5-6
formatter PCA 5-8
formatter system
described  5-8
front door components 8-10, 8-12
Front Panel Button, described  5-7
functional overview 5-1 to 5-22
functions, basic printer  5-3
fusing process  5-14
H
half page blank 7-17
half self test check
purpose 7-22
half self test functional check  7-22
hardware, common 8-6
high voltage power distribution  5-7
high voltage power supply PCA 5-7
high-voltage power supply check  7-24
horizontal stripes 7-15
HPD, HP’s Distribution Center  1-11
I
identification, labels 1-4
identification, printer  1-4
image defects 7-28
image developing 5-12, 5-14
image formation system
block diagram 5-12
DC controller 5-8
described  5-12
features 5-12
toner cartridge  5-13, 7-13
image formation troubleshooting 7-13
image fusing 5-12, 5-14
image transferring  5-12, 5-14
image writing 5-12 to 5-13
installation
DRAM 6-5
installing
memory cards  6-5
interfaces
Index
Index-1