Operating instructions

3-6
D. TROUBLESHOOTING PROCEDURES (cont'd)
Trouble Probable Cause Recommended Action
There is hum in the output. (You
can detect hum coming from the
booth speaker at normal listening
level.)
Malfunctioning exciter lamp or lamp power
supply.
Stray light striking the stereo solar cells.
Cover the solar cells with a business card or
other opaque object. Do NOT touch the cells
and do NOT disturb the position of the cell
bracket!
• If the hum disappears, the problem is in
the exciter lamp.
• If hum still persists, turn out all lights in
the booth to check if stray light is striking the
cells. If the hum disappears, turn on booth
lights that are usually on during projection,
one at a time, until you detect hum again.
Redirect the light from the last source or keep
it off during a showing. If the hum still is
present, the problem is either in the
grounding or wiring or in the CP45. Call
service engineer.