Ricoh PJ WX5350, Field Service Manual

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All wires are positioned away from high-temperature and high-voltage parts, and, if removed for
servicing, they must be retuned precisely to their original positions.
5. LAMP
Be very careful of the lamp because it generates high heat while it is used at high voltage. When
replacing the bulb, make sure it is cool enough.
6. LENS
Do not look into the lens during projection. This is important to avoid damage to the eyes.
7. SERVICING
At the time of repair or inspection services, use an earth band (wrist band), without fail.
8. RUN A COMPLETE SAFETY CHECK AT THE COMPLETION OF SERVICING
After completion of servicing, confirm that all screws, parts, and wiring, removed or disconnected
for servicing, have been returned to their original positions. Also examine if the serviced sections
and peripheral areas have suffered from any deterioration as a result of servicing. In addition,
check insulation between external metallic parts and blades of walloutlet plugs. This examination is
indispensable in confirming complete establishment of safety.
(Insulation check)
Pull out a plug from a wall outlet to disconnect the connection cable. Then turn on the POWER
switch. Use a 500V megger (Note 2) and confirm that the insulation resistance is 1M or more
between each terminal of the plug and exposed external metal (Note 1). If the measured value is
below the specified level, then it is necessary to inspect and fix the set.
(Note 1)
Exposed external metal....RGB input terminals, control terminals, etc.
(Note 2)
If a 500V megger is not available for an unavoidable reason, then use a circuit tester or the like for
inspection.
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