Dolby Laboratories CP500-300 Specifications download pdf (Page 101)

10-4

10.2 Between Shows

Open the door and look at the three LEDs at the left edge of the Cat. No. 684

system controller board. This is the horizontal board located at the bottom of the

CP500. If all three are lit, then the power supply is acceptable.

POWER INDICATORS

+5V-15V+15V

684

CAT.NO.

MAIN CP500 RESET BUTTON

NOTE:

There is no LED indicating +24V power. If the fan is running then +24V power is working.

Next, turn off the power amplifiers to avoid disturbing the audience.

The CP500 is equipped with several sets of LEDs which indicate the presence of

signals. These LEDs can assist in fault diagnosis. If you have only a small amount of

time between shows, then you may wish to perform this procedure after the theater

has closed.

NOTE:

The signals

do not

flow straight across the unit from left to right.

10.2.1 Analog Film Sound Signal Path LEDs

(Be certain that Format 04 is selected)

For playing analog films, the first LEDs in the signal path are located on the Cat.

No. 661 Optical Preamp card. This card is located on the third slot from the left in

the CP500 chassis (J3). Two LEDs near the center of the card indicate that signals

exist for the Lt and Rt sound channels from the film. The other two LEDs above

and below these indicate which projector is selected. If the center LEDs are not

flashing for normal film dialog level passages, then the problem may be one of the

following:

• The wrong projector is selected.

• The exciter lamp has failed.

• The solar cell is not in the correct position on the projector.

• This card has failed.

The second set of two LEDs for Lt and Rt are at the top of the Cat. No. 681 card,

which is the right-most full height card (J7). If the LEDs on the Cat. No. 661

(discussed above) are flashing and these LEDs are not, then either the Cat. No. 661

or Cat. No. 681 is faulty.

Next in the analog signal path are the LEDs on the Cat. No. 222 SR/A module,

located next to the Cat. No. 681 card (J4). The bottom LED of the set of four

LEDs located next to the Dolby symbol is a signal present indicator. The other

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Dolby Laboratories CP500-300 Specifications Page 101