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HP 1200 Service Manual - Page 149

Table 19., Solving print paper-feed problems continued, Problem, Cause, Solution, The printer

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Table 19. Solving print paper-feed problems (continued) Problem Cause Solution The printer feeds multiple sheets or jams frequently from the main input tray or priority input tray. Paper guides are not adjusted properly. Paper was not removed from the main input tray before refilling the tray. The main input tray is overfilled. Slide the guides against the sides of the stack in the main input tray or the priority input tray to center the paper. Make sure the guides are not adjusted too tightly. Always remove paper from the main input tray before refilling it. Remove some of the sheets. The main input tray can hold up to 250 sheets of 20-lb (75 g75 g/m2) bond weight paper (less for heavier paper) or from 20 to 30 envelopes. The priority input tray is overfilled. Remove some of the sheets. The priority input tray can hold up to ten sheets of 20-lb (75 g/m2) bond weight paper (one sheet of heavier paper) or one envelope. The paper was poorly cut by the manufacturer and is sticking together. "Break" the ream of paper by curving it into an upside-down u-shape; this can effectively decrease multifeeds. Also try turning the paper around to feed the opposite end first, or use a different type of paper. The paper does not meet HP's specifications for print media. Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family. The output capacity was exceeded in the paper output bin. Do not allow more than 125 sheets of 20-lb (75 g/m2) bond weight paper (less for heavier paper) to fill the paper output bin. The pickup roller is dirty. Clean the pickup roller. See "Cleaning the printer pickup roller" on page 49. The pickup roller is damaged. Replace the pickup roller. (See "Replacing the printer pickup roller" on page 41.) The separation pad is dirty. Clean the separation pad. (See "Cleaning the printer separation pad" on page 50.) The separation pad is damaged. Replace the separation pad. (See "Replacing the printer separation pad" on page 43.) A sensor is not operating properly. Check the sensors to make sure that none of them are jammed. If a sensor cannot be "unjammed," replace the sensor. EN Solving paper-feed problems 147

Section	Page
Contents	5
Figures	9
Tables	13
Product information	15
Chapter contents	15
Introduction	16
Hardware description	16
Firmware description	17
Product specifications	18
Model and serial numbers	21
Overview of printer	22
Front and side view	22
Back and side view	23
Overview of optional copier/scanner	24
Top view	24
Warranty statement	25
Extended warranty	26
Toner cartridge information	27
Refilled toner cartridges	27
Recycling toner cartridges	27
Installation and operation	29
Chapter contents	29
Operating environment	30
Identifying printer components	31
Printer control panel	31
Control panel light patterns	32
Copier/scanner control panel	34
Selecting media	35
Selecting media to print	35
Selecting media to copy or scan	36
Loading media	37
Loading media to print	37
Loading media to copy or scan	38
Printer output paths	39
Maintenance	41
Chapter contents	41
Life expectancies of consumables	42
User-replaceable parts	42
Replacing the printer pickup roller	43
Replacing the printer separation pad	45
Replacing the copier/ scanner separation pad	47
Cleaning the equipment	48
Cleaning the print path	49
Cleaning the toner cartridge area	50
Cleaning the printer pickup roller	51
Cleaning the printer separation pad	52
Cleaning and recalibrating the copier/scanner	53
Cleaning the scanner path	53
Operational overview	55
Chapter contents	55
Basic functions	56
Formatter system	57
Control panel	58
Draft mode	58
MEt	58
Enhanced I/O	58
PJL overview	59
Printer functions	60
Engine control unit/power system	61
Image formation system	66
Printer paper-feed system	69
Jam detection	71
Optional copier/scanner	73
Optical system	73
Document pickup and feed systems	73
Basic sequence of operation (formatter-to- printer)	75
Removal and replacement	77
Chapter contents	77
Removal and replacement strategy	79
Required tools	79
Before performing service	80
Toner cartridge	80
Parts removal order	81
Covers	82
Left side cover	82
Optional copier/scanner	83
Back cover	84
Right side cover	86
Top cover	89
Control panel assembly	90
Front cover assembly	91
Internal assemblies	98
Transfer roller	98
Formatter	99
Laser/scanner assembly	101
Fuser assembly	103
Output rollers	107
Motor	109
Solenoid	110
Fan assembly	112
Right plate assembly	114
Pickup assembly	116
Pickup roller shaft	119
Paper lift plate assembly	120
Left plate assembly	121
Bottom assemblies	122
ECU pan	122
Paper-feed assembly	126
Troubleshooting	131
Chapter contents	131
Basic troubleshooting	132
Errors	134
Control panel light messages	134
Fatal error secondary messages	137
Checking the toner cartridge	139
Solving image-quality problems	140
Solving paper-feed problems	148
Solving print paper-feed problems	148
Solving copying and scanning paper-feed problems	150
Functional checks	151
Engine test	151
Half self-test functional check	152
Drum rotation functional check	153
Heating element check	154
High-voltage power supply check	155
Paper path check	157
Service mode functions	158
NVRAM initialization/cold reset	158
PJL software commands	158
Troubleshooting tools	161
Internal reports	161
Repetitive image defect ruler	163
Main wiring	164
Locations of connectors	166
Locations of LEDs, jumpers, and switches	167
Parts and diagrams	169
Chapter contents	169
Ordering parts and supplies	170
Parts	170
Related documentation and software	170
Consumables	170
Accessories	171
How to use the parts lists and diagrams	173
Common hardware	173
Assembly locations	174
Printer trays & optional copier/scanner	174
Covers	176
Internal assemblies	178
Internal components (1 of 2)	178
Internal components (2 of 2)	180
Electrical components	182
Paper pickup assembly (1 of 2)	184
Paper pickup assembly (2 of 2)	186
Fuser assembly	188
Alphabetical parts list	190
Numerical parts list	193
Index	197
Numerics	197
A	197
B	197
C	197
D	198
E	199
F	199
G	200
H	200
I	200
J	201
K	201
L	201
M	201
N	202
O	202
P	202
Q	204
R	204
S	204
T	205
U	206
V	206
W	206
Y	206

Match case Limit results 1 per page

Solving paper-feed problems

147

The printer

feeds multiple

sheets or jams

frequently

from the main

input tray or

priority input

tray.

Paper guides are not adjusted properly.

Slide the guides against the sides of the

stack in the main input tray or the priority

input tray to center the paper. Make sure

the guides are not adjusted too tightly.

Paper was not removed from the main

input tray before refilling the tray.

Always remove paper from the main

input tray before refilling it.

The main input tray is overfilled.

Remove some of the sheets. The main

input tray can hold up to 250 sheets of

20-lb (75 g75 g/m

) bond weight paper

(less for heavier paper) or from 20 to 30

envelopes.

The priority input tray is overfilled.

Remove some of the sheets. The priority

input tray can hold up to ten sheets of

20-lb (75 g/m

) bond weight paper (one

sheet of heavier paper) or one envelope.

The paper was poorly cut by the

manufacturer and is sticking together.

“Break” the ream of paper by curving it

into an upside-down u-shape; this can

effectively decrease multifeeds. Also try

turning the paper around to feed the

opposite end first, or use a different type

of paper.

The paper does not meet HP’s

specifications for print media.

Make sure that the media meets

specifications detailed in the

Print Media

Guide

for the HP LaserJet printer family.

The output capacity was exceeded in the

paper output bin.

Do not allow more than 125 sheets of

20-lb (75 g/m

) bond weight paper (less

for heavier paper) to fill the paper output

bin.

The pickup roller is dirty.

Clean the pickup roller. See “Cleaning

the printer pickup roller” on page 49.

The pickup roller is damaged.

Replace the pickup roller. (See

“Replacing the printer pickup roller” on

page 41.)

The separation pad is dirty.

Clean the separation pad. (See

“Cleaning the printer separation pad” on

page 50.)

The separation pad is damaged.

Replace the separation pad. (See

“Replacing the printer separation pad” on

page 43.)

A sensor is not operating properly.

Check the sensors to make sure that

none of them are jammed. If a sensor

cannot be “unjammed,” replace the

sensor.

Table 19.

Solving print paper-feed problems (continued)

Problem

Cause

Solution