Installation manual

2–12 Hardware installation
Voltage Selector Switch
(Analog video / analog audio / digital audio)
A six–position switch is located near the front panel of the analog video, analog audio, and digital audio processing units.
A typical selector switch (for the DAP 3500/4000) is shown on page 2–13. (The digital video processing unit does not
have a voltage selector switch.)
Note 1: Power must be removed from the processing unit before the voltage selector switch is changed. We
recommend that the power cord be removed from the rear panel connector as well as the rear panel power
switch be set to off before any adjustments are made.
The correct setting for this switch must be determined in your installation. The switch is set to the 120 volt setting or
to the 220 setting from the factory. The power supply has a range of minus 10% to plus 15% of the indicated setting.
For example, when set to the 120 volt setting, the processing unit will operate properly from 108 volts to 130. The switch
setting should correspond to the average or normal line voltage in your facility. If your normal live voltage is not exactly
the same as one on the switch positions, then set the switch so that your normal voltage is in the lower part of the minus
10% to plus 15% range for minimum heat. For example if your normal line voltage is 113 volts, use the 120 volt setting
rather than the 100 volt setting even though 113 volts is within both ranges. The settings are as follows:
Switch Setting Operational Voltage Range
100 90 to 115 volts
120 108 to 138 volts
140 126 to 161 volts
200 180 to 230 volts
220 198 to 253 volts
240 216 to 276 volts
Figure 2–10.
Setting the switch to a lower setting than required will cause excessive heat to be dissipated which may result in early
equipment or component failure.
Note 2: When changing from 120 to 220 volt system, be sure to use the correct fuse as supplied. A separate
fuse and fuse holder is provided for each voltage range. The larger size fuse is for the 100 to 140 volt ranges
and the smaller for the 200 to 240 volt ranges.