Dolby Laboratories CP650 Installation Manual download pdf (Page 138)

Dolby

Model CP650 Troubleshooting Chart Maintenance and Troubleshooting

9-16

Symptom Probable Cause Recommended Action

CHANGEOVER AND

CONTROL TROUBLES

Projector changeover command does not

change the sound to the output of the

selected projector and the front-panel

indicators P1 or P2 do not light according

to the projector selected.

Defective changeover relay or switch.

Defective wiring from relay or switch to terminals on rear

of the CP650.

Defective Cat. No. 772 board.

If possible, check that the relay or switch contacts actually

open and close as the changeover command is issued

several times.

Check that the wiring has not been damaged and that

connections are firmly made at both ends.

Call service engineer.

With an automation system connected to

the CP650:

The CP650 freezes into one format and

does not accept any other selected format

when you press the front-panel buttons.

Incorrect wiring to D-connector plugged into CP650;

defective or incorrectly programmed automation

equipment.

Unplug the D-connector from the back of the CP650. If

you can exercise local control over the CP650, the problem

is either the wiring to the automation equipment or the

automation equipment itself. Call service engineer.

If you cannot exercise local control over the CP650 even

with the automation equipment disconnected, switch to

bypass mode by pressing the front-panel power button, and

call service engineer.

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Dolby Laboratories CP650 Installation Manual Page 138