Table of Contents
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Contents
SERVICE MANUAL ....................................................... 1
Contents ........................................................................ 2
Safety Instructions ......................................................... 3
Safety Precautions ..........................................................3
Product Safety Notice .....................................................3
Service Personnel Warning .............................................3
Specifications ................................................................ 5
Circuit Protections ....................................................... 10
Fuses (F601, F602, F603) ............................................. 10
Thermal fuses (SW903, SW904, SW905, SW906) ....... 11
Temperature sensors, wind sensors ............................. 12
Power failure, fan lock and filter error detection ............ 13
Maintenance ................................................................ 14
Maintenance .................................................................. 14
Replacing the unit.......................................................... 14
Air filter unit ................................................................... 14
Lamp unit ....................................................................... 17
Quick maintenance .......................................................21
Cleaning the optical parts..............................................22
Security Function Notice ............................................. 23
Mechanical Disassembly ............................................ 24
Order of mechanical disassembly ................................. 24
Optical Parts Disassembly .......................................... 43
Order of optical parts disassembly................................43
Servicing Notice .......................................................... 57
Note on main board replacement ..................................57
Adjustment data setting .................................................57
Serial number setting ....................................................57
Model no. setting ...........................................................57
Adjustments ................................................................. 58
Adjustments after parts replacement ............................58
Optical Adjustments .................................................... 59
Optical adjustment location ...........................................59
Before adjustment .........................................................60
1. Optical center adjustment ..........................................62
2. PBS adjustment .........................................................66
3. Contrast adjustment ..................................................67
4. Back focus adjustment ..............................................68
5. Convergence adjustment ..........................................69
Adjustment tool installation ...........................................70
Adjustment tool removal ................................................ 71
Adjustment ....................................................................72
Electrical Adjustments ................................................. 73
Service adjustment menu operation .............................73
Circuit adjustments ........................................................ 74
Test points and locations ...............................................78
Service adjustment data ................................................79
Chassis Description .................................................. 150
Chassis over view ....................................................... 150
Boards connection ...................................................... 151
Troubleshooting ......................................................... 152
No picture .................................................................... 152
No Power ..................................................................... 156
Power supplies to boards ............................................ 157
AC filter, AC-DC power board ..................................... 158
DC power board .......................................................... 159
PFC-1 & PFC-2 board ................................................. 160
Power supply and power failure detection................... 161
Power drive and power failure signals ......................... 164
Fan control system ...................................................... 165
Motor control system ................................................... 166
Temperature abnormality ............................................ 167
Lamp abnormality ........................................................ 168
Lamp control system ................................................... 169
Power failure detection system .................................. 170
Error history log ........................................................... 171
Diagnosis of power failure with serial port................... 172
Indicators and projector condition ............................... 173
Serial Control ............................................................. 177
Serial control interfaces ............................................... 177
Control Port Functions............................................... 180
IC Block Diagrams..................................................... 183
Exploded Views ......................................................SPL-2
Mechanical Parts List ...........................................SPL-20
Electrical Parts List ...............................................SPL-23
Pin description of diode, transistor and IC ...............DIA-2
Schematic Diagram ................................................ DIA-3
Circuit Board Diagram .......................................... DIA-15
-2-
LX1750 Service Manual
020-000643-01 Rev.1 (01-2014)
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