Exposure Time Verification - Sirona Orthophos 3 Maintenance Manual

Sirona Dental Systems GmbH
8.
I
O
4.

Exposure Time Verification

• The diaphragm 1 for panorama exposure is still adjusted at the diaphragm wheel.
1. Connect test point T1 of terminal on PCB DX1 to L of 110V power receptacle.
2. Connect common lead of pulse counter to N of 110V power receptacle.
3. Connect second measuring lead of pulse counter to test point T0.
4. Switch unit ON. Wait 1 min. for self-adjustment of the unit.
The X-ray head must be in the initial position (if not press return key R on Multitimer).
5. Remove and reinsert the film cassette.The LED above the R key on the Mutitimer must go out.
6. At the Multitimer select 72kV/10mA with P1 program.
• Measurement:
7. CAUTION RADIATION ! - Depress the exposure key and hold depressed until the exposure terminates
automatically.
The pulse counter shall indicate
- - Record average pulse count.
8. Without Tele-Exposure: If specified values are obtained, switch unit OFF.
Remove meter leads and refit small metal cover (2 screws).
• If specified value cannot be obtained, see Service Manual, chapter "Exposure Time Verification".
59 01 603 D3285
D3285.103.04.02.02
5.
No 1
6./ 7.
Multitimer
T1
1.
for Panorama Exposure
at 60Hz: nominal 11.3 sec.= 678 pulses±36
at 50Hz: nominal 11.3 sec.= 565 pulses±30
Maintenance Instructions
Pulse counter
3.
T0
2.
To
To
of
power receptacle
com.
N
L
110VAC
11