Dolby Laboratories CP500 Specifications download pdf (Page 78)

7-13

7.13 Maintenance and Adjustments

The Cat. No. 700 Digital Soundhead should be kept clean and free of dust and dirt

for best performance, just like the analog soundhead. Wiping the external surfaces

with a clean cloth on a regular basis will keep the head looking new. The optical

path should be inspected regularly and kept clean with a photographer’s lens

cleaning kit (available from most camera stores). Use care not to scratch the lens.

The film path (rollers and drum) should be cleaned regularly, as you would on the

projector. Acetone, carbon tetrachloride, or other dangerous cleaners should not

be used.

7.13.1 Replacing the Exciter Lamp

The exciter lamp in the Cat. No. 700 Digital Soundhead has been designed for long

life and should provide over 8000 hours of reliable use under normal circumstances.

Routine replacement will depend on your theater’s hours of operation. To replace

the exciter lamp, carefully remove the six screws holding the rear cover/power

supply of the Digital Soundhead. Allow the lamp to cool if necessary. With the rear

cover removed, the lamp will be visible but still attached to the rear cover assembly

by its two supply wires. Slide the lamp out of its base. Carefully remove a new lamp

from the protective box, and using gloves or a clean, lint-free cloth, replace the

lamp in the socket. Be careful not to touch the bulb or inner surface of the reflector

in the lamp. If either is accidentally touched, carefully clean the area with isopropyl

alcohol when the bulb is cool. Slide the lamp back into its base in the soundhead,

replace the rear cover assembly and tighten the six screws.

Replacement lamp:

Use only General Electric EPT

Reflector-type

42W

Dolby Part No. 34010

Figure 7- 8.

Digital Soundhead Exciter Lamp Replacement.

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Dolby Laboratories CP500 Specifications Page 78