Service manual

EPSON ELP-3500 Service Manual
3-2
Precautions
Read the precautions given in individual assembly and disassembly procedures carefully
before starting the procedure. General precautions are given below.
When you disassemble the projector main unit, be careful of dust sticking to internal fans
and air filters because it can migrate and contaminate the optical unit, which is the heart
of the display mechanism, causing display quality to deteriorate. The optical unit is also
highly sensitive to static electricity.
The speaker unit contains a permanent magnet. Keep it away from electromagnetic
media such as diskettes and magnetic cards.
Handle the projector lens and light guide units with care as they are highly susceptible to
vibration and shock.
Do not try to disassemble any part (for example, the power supply unit) not covered in
this manual.
Operations that Require Adjustments and Checks
When you perform one of the removal or replacement operations in the table below, you
need to perform the checks and adjustments explained in Chapters 5. Perform
necessary adjustments and checks before reinstalling the upper case unit.
Table 3-2.
Operation Adjustment and check item
Driver board replacement Check the 16 grayscale levels
Flash ROM replacement Flicker/Ghost/Sub-contrast adjustments
Optical unit replacement Check and adjust focus alignment
Flicker/Ghost/Sub-contrast adjustments