Dolby
®
Model CP650 Installation Manual
Back Panel Connectors
B-5
Motor-Start Connector
The motor-start connector is used to interconnect the changeover control lines of the
CP650 with the theatre control system. If the CP650 is to be used in a platter
operation (single projector), a jumper must be installed on this connector between
pins 1 and 5. This configuration is identical to the one used on the Dolby CP500.
Motor Start:
Less than 1 VDC with respect to signal ground.
Motor Off:
Greater than 3.5 VDC, less than 18 VDC.
Table B–
5 Motor-Start Connector Pinout
Pin
Connection
1
Motor Start 1
2
P1 Changeover select (gnd)
3
P1 / P2 Changeover select (gnd for P2)
4
P2 Changeover select (gnd)
5 Chassis
Gnd
9
Motor Start 2
Optical Input Connectors (1 and 2)
There are two connectors for analog solar cell inputs from analog soundheads. Up to
two projectors can be connected to the CP650. The pinout for each connector is
identical. In addition to providing for the input of the analog soundhead signals, the
CP650 has bipolar DC outputs to supply power to optical preamplifiers (±14 VDC).
This DC voltage is supplied from the CP650 bypass power supply to ensure that
optical preamplifiers still function if the CP650 switches to bypass operation during a
performance. The maximum supply current available is 15 mA per preamp.
Table B–6
Optical Input Connector Pinout
Pin
Connection
1 L+
2 L–
3 GND
4 R+
5 R–
6 GND
7
+14 V supply (through a 150
resistor) 20 mA max
8
–14 V supply (through a 150
resistor) 20 mA max
9 GND
MIC Input Connector
The Mic Input is a balanced input using a three-pin XLR female connector. This
connector is a duplicate of the MIC MUX input connector on the front setup panel.
Table B–7
Mic Input Connector Pinout
Pin
Connection
1 Shield
2 +
signal
3 –
signal
