ViewSonic PJ550 - User Manual

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PJ550

(C3XM2)

SERVICE MANUAL

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

Multimedia LCD Projector

December 2001

Be sure to read this manual before servicing. To assure safety from re, electric shock, injury, harmful

radiation and materials, various measures are provided in this Multimedia LCD Projector. Be sure to read

cautionary items described in the manual to maintain safety before servicing.

Caution

1. When replace the lamp, to avoid burns to your ngers. The lamp becomes too hot.

2. Never touch the lamp bulb with a nger or anything else. Never drop it or give it a shock. They may cause

bursting of the bulb.

3. This projector is provided with a high voltage circuit for the lamp. Do not touch the electric parts of power

unit (main), when turn on the projector.

4. Do not touch the exhaust fan, during operation.

5. The LCD module assembly is likely to be damaged. If replacing to the LCD module assembly, do not hold

the FPC of the LCD module assembly.

6. Use the cables which are included with the projector or specied.

ServiceWarning

1. Features --------------------------------------------------- 2

2. Specications--------------------------------------------- 2

3. Names of each part ------------------------------------- 3

4. Adjustment ------------------------------------------------ 5

5. Troubleshooting ---------------------------------------- 12

6. Service points ------------------------------------------ 17

7. Block diagram ------------------------------------------ 23

8. Connector connection diagram -------------------- 24

9. Wiring diagram ----------------------------------------- 25

10.Basic circuit diagram---------------------------------- 32

11.Disassembly diagram--------------------------------- 59

12.Replacement parts list ------------------------------- 61

13.RS-232C communication ---------------------------- 62

Contents

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Summary

ViewSonic Projector Service Manual

Service Safety Warnings

Critical safety precautions for projector servicing.

RS-232 C Communication Protocol

Communication Protocol Details

Defines the communication protocol parameters and structure.

Command Header Format

Details the structure and components of the command header.

Command Data Structure

Explains the command data structure, actions, and setting codes.

Summary

ViewSonic Projector Service Manual

Service Safety Warnings

Critical safety precautions for projector servicing.

RS-232 C Communication Protocol

Communication Protocol Details

Defines the communication protocol parameters and structure.

Command Header Format

Details the structure and components of the command header.

Command Data Structure

Explains the command data structure, actions, and setting codes.

Overview

Function Description
Important Technical Specifications (Derived from the manual's content structure)
Usage Features
Maintenance Features

This document is a service manual for the ViewSonic PJ550 (C3XM2) Multimedia LCD Projector, published in December 2001. It provides comprehensive information for servicing, including specifications, operational details, troubleshooting, and replacement parts.

Function Description:

The ViewSonic PJ550 is a multimedia LCD projector designed for displaying images and video from various sources. It incorporates an LCD panel for image generation and is equipped with a high-voltage circuit for its lamp, which is a critical component for light output. The projector supports multiple input sources, including RGB, Video, S-Video, and Component, making it versatile for different applications such as presentations, home entertainment, and educational purposes. It also features RS-232C communication for external control, allowing integration into automated systems or remote management. The projector includes various image adjustment capabilities, such as brightness, contrast, color balance, sharpness, and keystone correction, to optimize the display for different environments and content.

Important Technical Specifications (Derived from the manual's content structure):

Model: PJ550 (C3XM2)
Type: Multimedia LCD Projector
Communication Interface: RS-232C (D-sub 9-pin terminal for computer, D-sub 15-pin shrink for control terminal)
RS-232C Communication Settings: 19200bps, 8N1
RS-232C Protocol:
- Header: 7 bytes (BE + EF + 03 + 06 + 00 + CRC_low + CRC_high)
- Command Data: 6 bytes (byte_0 to byte_5, including Action, Type, and Setting code)
Supported Input Sources: RGB1, Video, SVideo, Component
Image Adjustment Parameters (via RS-232C):
- Blank Color: Red, Orange, Green, Blue, Purple, White, Black
- Mirror: Normal, H Inverse, V Inverse, H&V Inverse
- Freeze: Normal, Freeze
- Menu Color: Red, Orange, Green, Blue, Purple, Transparent, Gray
- Startup: Turn ON, Turn OFF
- Language: English, Français, Deutsch, Español, Italiano, Norsk, Nederlands, Português, Japanese
- Magnify: Increment, Decrement
- Auto Off: Increment, Decrement
- Brightness: Increment, Decrement
- Contrast: Increment, Decrement
- Color Balance R: Increment, Decrement
- Color Balance B: Increment, Decrement
- Keystone: Increment, Decrement
- Volume: Increment, Decrement
- V.Position: Increment, Decrement
- H.Position: Increment, Decrement
- H.Size: Increment, Decrement
- H.Phase: Increment, Decrement
- Sharpness: Increment, Decrement
- Color: Increment, Decrement
- Tint: Increment, Decrement
- Mute: Normal, Mute
- Aspect Ratio: 4:3, 16:9, Small
- Display Position (16:9 or Small): Default, Bottom, Top
- Video Format: Auto, NTSC, PAL, SECAM, NTSC 4.43, M-PAL, N-PAL
- HDTV: 1080i, 1035i
- Sync on G: Off, On
- WHISPER Mode: NORMAL, WHISPER
- GAMMA: NORMAL, CINEMA, DYNAMIC
- COLOR TEMP.: NORMAL, LOW
Reset Functions (via RS-232C): Brightness Reset, Contrast Reset, V.Position Reset, H.Position Reset, H.Size Reset, Color Balance R Reset, Color Balance B Reset, Sharpness Reset, Color Reset, Tint Reset, Keystone Reset
Execute Functions (via RS-232C): Auto (for image adjustment)
Power Control (via RS-232C): OFF, ON
Blank On/Off (via RS-232C): Off, On
Error Status Reporting (via RS-232C): Normal, Cover-error, Fan-error, Lamp-error, Temp-error, Air-flow-error, Lamp-Time-over, Cold-error

Usage Features:

The projector can be controlled remotely via an RS-232C serial connection, allowing for a wide range of commands to be sent from a computer. These commands enable users to:

Request Projector Status: Obtain current settings and operational status, including error codes (e.g., lamp-error, fan-error, temperature-error).
Change Projector Settings: Adjust various display parameters like brightness, contrast, color, position, size, and aspect ratio.
Use Default Settings: Reset specific settings to their factory defaults.
Increment/Decrement Values: Fine-tune adjustable settings like brightness, volume, and image positions.
Select Input Sources: Switch between different video inputs (RGB, Video, S-Video, Component).
Control Power: Turn the projector ON or OFF remotely.
Manage Display Modes: Set aspect ratio, video format, HDTV modes, and gamma settings.
Activate Special Modes: Engage "Blank On/Off" for temporary screen blanking, "Mute" for audio control, and "WHISPER" mode for quieter operation.
Language Selection: Change the projector's menu language.

The RS-232C communication protocol is structured with a header and command data, allowing for precise control. The manual details specific hexadecimal codes for each command and setting, facilitating custom software development for projector control.

Maintenance Features:

The service manual emphasizes several critical safety and maintenance points:

Lamp Replacement:
- Caution against burns: The lamp becomes very hot during operation.
- Handling precautions: Never touch the lamp bulb with fingers or other objects, and avoid dropping or shocking it, as this can cause bursting.
High Voltage Circuit: Warning not to touch electric parts of the main power unit when the projector is turned on, due to the presence of a high-voltage circuit for the lamp.
Exhaust Fan: Warning not to touch the exhaust fan during operation.
LCD Module Assembly: The LCD module assembly is delicate and prone to damage. When replacing it, avoid holding the FPC (Flexible Printed Circuit) of the assembly.
Cable Usage: Only use cables included with the projector or those specifically specified in the manual.
RS-232C Communication Notes:
- Undefined commands/data: Operation cannot be guaranteed if the projector receives undefined commands or data.
- Response interval: Provide an interval of at least 40ms between the response code and any other code.
- Test data: Ignore test data output by the projector when power is switched ON or when the lamp is lit.
- Warm-up period: Commands are not accepted during the projector's warm-up phase.
Error Reporting: The projector can report various error statuses via RS-232C, including cover-error, fan-error, lamp-error, temperature-error, air-flow-error, lamp-time-over, and cold-error. This allows for remote diagnosis of potential issues.
Troubleshooting Section: The manual includes a dedicated troubleshooting section (Section 5) to guide service personnel in diagnosing and resolving common problems.
Replacement Parts List: A comprehensive list of replacement parts (Section 12) is provided to facilitate repairs and component sourcing.
Disassembly Diagram: A disassembly diagram (Section 11) is included to assist technicians with the correct procedure for taking the projector apart for service.