Set the multimeter selection to 150vac.
Connect the multimeter leads to terminals K3 N and L.
(d) Turn the unit on and allow it to warm up for five minutes.
(e) Verify that the voltage on the multimeter coincides with the unit's
dvm. The measured line voltage must be at least 109vac, and may not exceed 133vac.
If the voltage values are not within one volt (v), the unit's dvm must be
calibrated before continuing. See Lesson 2, Perform Verification/Calibration
of the Inter-oral Dental X-ray.
Adjust the line compensation switch, if necessary, and verify the
green led is on.
(g) Record the readings with no load.
(h) Set the exposure time to 3.2 seconds and make an exposure.
Record the readings of the unit's dvm with a load.
(j) As illustrated in the example shown below, determine the voltage
drop under load by subtracting "the voltage under load" from "the no load voltage."
NO LOAD VOLTAGE
VOLTAGE UNDER LOAD
The maximum permissible voltage drop between the no load voltage and the
voltage under load must not exceed 6 volts during the entire operation. If the
voltage drop exceeds 6 volts, you must replace the power source.
Verify the tube head current.
(a) Turn off the unit.
(b) Remove the 9,10 jumper circuit board D1. See figure 1-9.
Connect the multimeter to D1 9,10. See figure 1-9.