Power Supply Voltage Test Points - Dolby Laboratories CP650 Installation Manual

CP650 Installation Manual
Mic Input Level Control
This ten-turn potentiometer has an end-to-end range of 46 dB. It is factory-adjusted to
accommodate most microphones.
Bypass Output Level Control
This ten-turn potentiometer has an end-to-end range of 30 dB.
Setup DIP Switch
The eight-position DIP switch is used to set the functions shown. All switches are
factory-set to down. Switches 2, 5, 7, and 8 are not used. DIP switch 6 is used to enter
CP650 setup mode.
Lt/Rt Signal Present LEDs
These LEDs indicate that signals exist on the Lt and Rt sound channels from the
film's analog soundtrack. They flash during film playback in both normal and bypass
operation.
Serial Communications Port (RS-232)
A laptop PC can be connected to this port using a straight-through (pin 1 to pin 1, pin
2 to pin 2, etc.) cable. A cable with receive and transmit lines swapped (null modem
cable) will not work. Setup software is available for aligning the CP650. This
connector is duplicated on the rear panel of the CP650.
MIC MUX Connector
When setting up a CP650, a microphone multiplexer can be plugged into this
connector (or to the XLR connector on the rear panel for some types of units).
Test Points
These test points are provided to allow rapid access to the required signals used
during CP650 setup. Each test point is a 2-mm diameter female socket that accepts a
2-mm male test pin. Test point pins can be obtained in the USA from ITT Pomona
Electronics. Type 3221 is a useful, stacking, pin-to-BNC female adapter.
3.3

Power Supply Voltage Test Points

Six test points are located behind the front panel for
measuring power supply voltages. They can be
accessed by removing the front panel. See Section
9.3.1 for the voltage test ranges.
Main power supply DC test points:
+15 V, -15 V, +5 V
Bypass power supply DC test points:
+14 VB, -14 VB, +5 VB
(A portion of the front sub-panel with front panel removed is shown in this figure.)
Figure 3–4 Power Supply Voltage Test Points
Front Panel and Alignment Overview
3-5
--15V
--14VB +15V
MIC MUX
+5V
Rs Sw
+5VB
®
+14VB