DENT-X ROTOGRAPH PLUS - Checking the Output Current (Ma); First Solution (Rotating Arm in Movement); Second Solution (Rotating Arm Blocked)

SERVICE MANUAL
Checkout and adjustments
(Rev. 0) RTG PLUS (120V)
7-13
7.4
7.47.4
7.4 Checking the output current (mA)
Checking the output current (mA)Checking the output current (mA)
Checking the output current (mA)
WARNING:
The followings tests (7.4.1 and 7.4.2) implies X-ray emission; please
follow all measures envisaged by local safety regulations.
NOTE:
The output current can be checked both with the arm rotating or in
stopped. Hereafter the two different methods are described.
7.4.1
7.4.17.4.1
7.4.1 First solution (rotating arm in movement)
First solution (rotating arm in movement)First solution (rotating arm in movement)
First solution (rotating arm in movement)
1. Verify that the display show 75kV, in the other case use the
"decrease" key (40) or "increase" key (41) of the hand control to
change the value to 75kV.
2. Connect the probes of a DVM in VDC, full scale 20V, in the TEST mA
plugs of A1 board or to pins 5-6 of X9 on the same board. This allows
to measure voltage drop on resistor 1K – 0.5W generates by the flow
of anodic current through it (1V equals 1mA).
3. Move the S1 switch of board A1 toward the test points.
4. Press the X-ray button and check that the voltage is 10V ± 1V. If not,
adjust the R2 resistor collar of board A1; moving the cursor to the
top, the anodic current value will increase, moving to the bottom will
decrease. Once the regulation is complete, tighten the screw on the
resistor collar.
5. After the adjustment, set the S1 switch back to its initial position.
7.4.2
7.4.27.4.2
7.4.2 Second solution (rotating arm blocked)
Second solution (rotating arm blocked)Second solution (rotating arm blocked)
Second solution (rotating arm blocked)
1. Access the set-up program (see paragraph 7.2), then press “s” (39)
and "T" (31) several times until the S4 function is displayed. Change
the status of S4 to ON by pressing "s" (39).
2. Press "R" (32) to display 85kV. Use the "decrease" key (40) to change
such value to 75kV.
3. Connect the probes of a DVM in VDC, full scale 20V, in the TEST mA
plugs of A1 board or to pins 5-6 of X9 on the same board. This allows
to measure voltage drop on resistor 1K – 0.5W generates by the flow
of anodic current through it (1V equals 1mA).
4. Move the S1 switch of the board toward the test points.
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