Dolby
®
Model CP650 Installation Manual
Installation
2-2
2.1.3
Disconnect the Old System
•
Disconnect power from the existing cinema sound equipment.
•
Disconnect all cabling from the existing sound processor. Leave the cables
connected to the power amplifiers, booth monitor, etc.
2.2
Check Fuse and Bypass Mains Voltage Selector
WARNING: Check that the correct main fuse has been installed. To reduce
the risk of fire, replace only with fuses of the same type and rating.
The CP650 uses a universal switching power supply that can accommodate nominal
mains voltages from 100 to 120, and 200 to 240 VAC, at frequencies from 50 to
60 Hz.
Check Main Fuse
The main power supply fuse is a 6.3 A, 250V, 20 mm, time-lag, low breaking
capacity fuse (T 6.3 L). With a small flat-blade screwdriver, open the fuse
compartment door on the AC power input housing (See Figure 2–1.)
Figure 2–1
Main Fuse Assembly
Remove the fuse carrier and check that the fuse in the active (left position) is of the
correct rating. The fuse carrier must be inserted into the compartment with the fuse
oriented to the left.
Do not force the carrier into the compartment. Damage will
result.
The polarizing clip must be attached on the right side of the carrier at the rear.
Snap the fuse compartment door closed.
Check Bypass Supply Mains Voltage Setting
The bypass power supply mains voltage selector switch is accessible through a hole
in the top cover of the CP650. Use a screwdriver to set the switch to either 120 or
220 VAC
Figure2_8 shows the switch location.
Caution:
Be sure to check this setting. If the bypass voltage selector is set to 120 V but the
unit is connected to 220 V mains voltage, the bypass power supply fuse will blow.
