Gasboy 1000 Series FMS Startup Manual - Manual (Page 36)

03/07/03 8-1
Section 8
DC POWER
SERIES 1000
1.
Turn on the system AC POWER switch located in the rear of the unit. The fluorescent lamp
should light and the system should begin to operate.
2. Using a digital DC voltmeter, measure the following voltages. If any of the measured DC
voltages are outside of the tolerance noted below (except for +5 which can be adjusted),
immediately shut off the AC POWER switch and diagnose the problem. Do not record any
other DC voltages until this voltage is properly adjusted. Test points are provided on the rear
edge of the microprocessor PCB (see Figure 5-2). All voltage measurements should be
taken with the negative lead of the meter on the ground (GND) test point. This is the black
test point and is easily identifiable.
✍
8. DC POWER
As you are measuring the noted voltages, fill in the readings for each in this section of the Start-up
form.
+5VDC
Measure to the +5 orange test point. The tolerance for this voltage is +5.0 to +5.1; however,
this voltage is adjustable and should be adjusted as close to 5.0 as possible. If an adjustment
needs to be made, follow steps a through f below.
a.
Turn the AC POWER switch off.
b. Remove the three screws from the mesh cover protecting the power supply and remove
the cover.
c.
Turn the AC POWER switch back on.
CAUTION
Be careful not to touch anything but the white adjustment screw located in the
upper right hand corner. High voltage exists around the power supply and
electrical shock may occur.
d. Using an 1/8 inch or smaller plastic flat blade screwdriver, adjust the power supply to
+5.0VDC by turning the voltage adjustment screw clockwise to increase voltage,
counterclockwise to decrease voltage. (The screw is located at the top and slightly to the
right of the center of the power supply board.) Turn the screw slightly to judge the
sensitivity.
e.
Turn the AC POWER switch off and replace the mesh cover.
f.
Turn the AC POWER switch back on.