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Chapter 7---Troubleshooting
Model 250 Service Manual 7-1
7.0 Troubleshooting
Contents
7.1 Safety............................................................................................................ 7-1
7.2 LEDs............................................................................................................. 7-2
Backpanel LEDs......................................................................................... 7-2
Video Processor PCB LEDs....................................................................... 7-5
Raster Timing Generator PCB LEDs......................................................... 7-7
Convergence Deflection PCB LEDs.......................................................... 7-9
Video Amplifier PCB LEDs ...................................................................... 7-10
Backplane PCB LEDs................................................................................ 7-11
7.3 Diagrams ...................................................................................................... 7-12
Image Path.................................................................................................. 7-14
Deflection Path........................................................................................... 7-15
CRT Protection........................................................................................... 7-19
7.4 Error Codes .................................................................................................. 7-22
7.5 Troubleshooting Guide................................................................................. 7-25
Troubleshooting on the Backplane PCB.................................................... 7-26
7.1 Safety
CAUTION
!
Before performing procedures in this chapter,
review the chapter on Safety at the beginning of this manual.
WARNING
!!!
When performing troubleshooting
procedures that require projector covers to be off,
wear high voltage
gloves (ANSI/ASTM 10,000 volt rated) when working near the CRTs,
Arc Lamp, or power supplies
.
Wear safety goggles (rated X5) when
working anywhere near the light path from the arc lamp or the
projection lens
.