Dolby Laboratories CP500-300 Specifications download pdf (Page 108)

10-11

Symptom Probable Cause Recommended Action

RUMBLES, WHISTLES,

HUM etc. IN SOUND

Rumble in sound, regardless of format Audio grounding scheme may need changing. Call service engineer.

Whistles in sound Audio grounding scheme may need changing. Call service engineer.

Hum (power line frequency) in sound 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 offending 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 CP500. Call a service engineer.

1 2 ... 103 104 105 106 107 108 109 110 111 112 113 ... 152 153

No comments

Dolby Laboratories CP500-300 Specifications Page 108