1984–1995 HP LaserJet I/I+/ID, II/IID, III/IIID, IIP/IIP+/IIIP & 2000 Printer Troubleshooting Manual, Volume 1

Volume 1 of Hewlett-Packard's Classic LaserJet Troubleshooting Manual, Revision 13 (April 1995), covers the 1984–1995 LaserJet I/ID, II/IID, III/IIID, IIP/IIP+/IIIP and 2000 families, including the LaserJet I+ variant. Its five sections combine shared reference data with model-specific field faults.

• Power and control: Fault isolation for the DC Controller PCA, formatter boards, High Voltage Power Supply (HVPS), laser/scanner units and fuser assemblies.

• Print quality: EP drum, corona wire and roller fault checks, repetitive-defect charts, half self-tests and engine tests with the formatter removed.

• Paper handling: Error 13 troubleshooting for pickup rollers, separation pads, registration assemblies, cassette trays, manual feed and powered envelope feeders.

• LaserJet 2000 duplex systems: PDX, FDS stacker and switchback diagnosis, second-pass jam localization, paper-path LED identification and drive-version comparisons.

• Host connections and service aids: Serial/parallel cable pinouts, HP3000 configuration, Novell/JetDirect checks, LED test-board functions and model-specific service-note indexes.

Written for HP service engineers and call qualifiers, this guide suits readers already familiar with printer assemblies and electrical fault diagnosis.

Power-Supply and Formatter Fault Isolation

The LJII/III DC Power Supply / Error 12 flowchart separates formatter, controller, power-supply and connected-load faults. That distinction helps narrow a missing-supply problem before selecting a replacement board.

Service test boards 33440-67905 for the II/III and 33447-67906 for the IID/IIID provide voltage and control-signal indications; the latter also monitors duplex solenoids and photosensors.

For the 2686A/2686D, the guide warns that pinched interface-power wiring during reassembly can cause smoke and damage the I/F PCA.

Print Defects, Fusers and Paper Feed

The print-quality sections connect repeated marks, blank pages, background toner and distorted characters to specific rollers, EP drums, optics and transfer components. Half self-tests distinguish image-formation faults from transfer problems.

The IIP notes connect intermittent Error 41 and PS BUSY to fuser static discharge and describe a three-diode upgrade. Related service notes flag fuser-component compatibility differences across the IIP/IIP+/IIIP family.

Media troubleshooting covers skew, registration, paper conditioning and toner cracking when a sheet is folded. Cartridge references distinguish full and empty weights, expected page yield and storage requirements.

Always verify the printer is completely disconnected from its main power source and allow the fuser assembly ample time to cool before testing internal components.

LaserJet 2000 Switchback and Duplex Diagnosis

The Paper Path LED Identification display, Jam Location Matrix and Duplex Paper Path diagram distinguish print-engine, stacker, holding-tray and second-pass faults. The explanation of successive jam messages helps identify the original jam area when a later print-engine error masks it.

Friction-drive and positive-drive switchback drawings compare rollers, springs and clutch washers. A separate component view shows the lower-roller washer arrangement. Firmware notes distinguish PDX revisions associated with clutch seizure and duplex leading-edge damage.

The 2684 Scope Elimination section describes foldback-mirror diagnosis using RF probe 34301A and a voltmeter. The 2000 material is a troubleshooting companion to the separate model service manual. Later LaserJet 4, Si and Color LaserJet models belong to the planned Volume 2.

Serial Interfaces and JetDirect Checks

The I/O Cable Information tables distinguish PC cabling from HP3000 connections and show HP9000 RJ45 MUX pin assignments. LaserJet 2000 setup tables cover baud selections from 600 to 19200 bps.

Novell 23 I/O Not Ready troubleshooting uses the XIO Status Page to separate configuration and network-connection problems from suspected interface hardware faults. The JetTest section describes a separate boot-disk test utility; the utility itself is not part of this PDF.

A Sample of Registration and Consumable Reference Data

These examples are a small selection of the manual's registration and consumable data.

The general skew table specifies 1.5 mm over 260 mm. For the LaserJet I, leading-edge registration is 8.0 mm ± 2.0 mm, measured on a self-test page.

Cartridge weights distinguish an empty EP-L for the IIP/IIP+/IIIP at 775–825 g from a full EP-C for the I/ID at 1550 g. LaserJet 2000 EP drum storage conditions include 0–35°C and 35–85% relative humidity.

PDF Search, Diagram Detail and Included Pages

Search coverage and diagram labels: OCR text search is partial: some contents tables, the XIO status-page example and an IIP/IIIP fault page lack searchable body text. There are no embedded PDF bookmarks. Small cable-pin and switchback labels benefit from zooming; lettering in the XIO example is coarse.

One printable, English-language, 123-page PDF contains this troubleshooting and repair reference. The total already includes the cover, publication notice, five contents pages and four model-section divider pages.