Measurement Computing DAC488 v.1 - Manual (Page 21)

DAC488 User’s Manual DAC488 Power & Assembly 15
Note: If disassembly or disconnections are necessary, first turn off the power, then disconnect the analog
output cables, next disconnect the AC power line, and then any other cables, prior to disassembly.
To Select the Line Voltage
1. Turn off the power, then disconnect the analog output cables. Next, disconnect the AC power line
cord, and then all other test cables from the unit.
2. Place the unit on a flat surface. Remove the six screws on top of the case and remove the top cover.
3. Located next to the main power supply transformer is the line voltage selection switch (labelled S104).
Using a small screwdriver, insert the tip of the screwdriver into the slot of the switch and slide the
switch to the left or right until it "clicks" into place with the desired line voltage selection visible.
CAUTION CAUTION CAUTION CAUTION
It is possible to place the line voltage switch (S104) in a partial position which could
cause equipment damage or malfunction. When changing the position of the line
voltage selection switch (S104), make sure the switch is completely positioned to the
115 V or 220 V selection. The switch will “click” into place when properly positioned.
4. Install a power line fuse appropriate for the line voltage. See section Fuse Replacement – Step 3,
following this section.
CAUTION CAUTION CAUTION CAUTION
Fuse Failure: Fuse failure indicates a possible problem within the device circuitry. If a
fuse blows, contact a qualified service representative. Replacement fuses are to be
installed by qualified service personnel with the unit disconnected from the power
source and with all other terminals disconnected. If the line voltage selector is
changed, then the fuse designated for that line voltage must be used.
5. Make note of the new voltage setting for later reference.
6. Carefully reassemble the unit.
Note: For re-assembly, first reconnect the AC power line, next reconnect the analog output terminals, and
then any other cables, prior to reapplying power to the entire system.