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Chapter 5---Troubleshooting
5-9 Model 330, 340SC, and 370SC Service Manual
Problem and
Symptom to
Check
Possible Solution Service
Manual
Operator
Manual
LEDs 200, 300, or
400 on the
vertical
deflection are
unlit.
Replace Vertical Deflection Board. 4.11
LEDs 200 and 201,
or 300 and 301,
or 400 and 401
on the vertical
deflection are
unlit.
Replace Horizontal Deflection
Board
if any two (2) are unlit.
4.11
Increasing G2
voltages
decreases
brightness level
for all CRTs.
Faulty High Voltage Power Supply
under full load. Replace High
Voltage power Supply.
4.10
Arc Lamp
Arc lamp will not
light-'clicking'
sound audible
when projector is
commanded ON.
Replace worn out Arc Lamp. 4.4
'Clicking' sound not
audible when
projector is
commanded ON.
System Power Supply or Ignitor
Assembly
faulty. Replace SPS or Ignitor
Assembly.
4.5
Arc Lamp ignites
but will not stay
lit.
Replace defective Ignitor
Assembly.
4.4
Brightness flicker or
Picture very
dim.
Arc Lamp may have too many
hours.
Replace Arc Lamp.
4.4