Operating instructions

2-4

6. Turn the projector on.

7. As the test loop is played, watch the LEDs on the Cat. No. 222A/

SR. Correct Dolby Level is indicated when the two center green

LEDs for each channel are equally bright. If necessary, adjust the

Left and/or Right gain controls (mounted on the front edge of the

Cat. No. 510) for the projector in use so that the pair of green LEDs is

equally lit. Be very careful not to adjust the adjacent, recessed hf

control by mistake; if this control is inadvertently changed, a service

engineer with special test equipment is required to readjust it.

PROJECTOR 1

LEFT RIGHT

LEVEL LEVEL

PROJECTOR 2

LEFT RIGHT

LEVEL LEVEL

Dual SR/A Decoder ModuleDual SR/A Decoder Module

AASRSR

Cat.No.222SR/ACat.No.222SR/A

CAT. NO. 510

8. Repeat the above procedure for the other projector.

NOTE

If you happen to play the test film with a stereo optical format (04 or 05)

selected after Dolby Level has been correctly adjusted, you may notice that the

pairs of green LEDs are not equally lit or that one or both of the left hand side

LEDs goes out completely. This is normal, and represents a very small (less

than 0.5 dB) level difference when the Dolby noise reduction circuitry is

switched on for the stereo formats.