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MODEL 303
DENTAL X-RAY

Service Manual

R
Index

1 Adjustments required after parts replacement ......................................... 4
2 Error Code............................................................................................................................. 4
2.1 Error Code: E.00 ........................................................................................................................4
2.2 Error Code: E.01 ........................................................................................................................4
2.3 Error Code: E.02 ........................................................................................................................5
2.4 Error Code: E.03 ........................................................................................................................5
2.5 Error Code: E.05 ........................................................................................................................6
2.6 Error Code: E.06 ........................................................................................................................6
2.7 Error Code: E.07 ........................................................................................................................7
2.8 Error Code: E.08 ........................................................................................................................8
2.9 Error Code: E.09 ........................................................................................................................8
2.10 Error Code: E.10 ......................................................................................................................9
2.11 Error Code: E.11.......................................................................................................................9
2.12 Error Code: E.12 ......................................................................................................................9
2.13 Error Code: E.14 ......................................................................................................................9
2.14 Error Code: E.15 ....................................................................................................................10
2.15 Error Code: E.16 ....................................................................................................................10
2.16 Error Code: E.17 .................................................................................................................... 11
2.17 Error Code: E.19 .................................................................................................................... 11
2.18 Error Code: E.20 .................................................................................................................... 11
2.19 Error Code: E.22 ....................................................................................................................12
2.20 Error Code: E.23 ....................................................................................................................12
2.21 Others ......................................................................................................................................12

3 Setting Mode.................................................................................................................. 13
3.1 Film type, digital mode and priority selection.....................................................................13
3.2 Tube current adjustment value ...............................................................................................14
3.3 Tube voltage adjustment value................................................................................................14
3.4 Buzzer ........................................................................................................................................15
3.5 Manual setting of preheating power .......................................................................................15
3.6 Automatic adjustment of preheating power ..........................................................................15
3.7 Lock mode .................................................................................................................................16
3.8 Standard density value for each tooth ....................................................................................16
3.9 Overview mode .........................................................................................................................16

-2-
4 Exposure time ............................................................................................................... 17
4.1 Assignable exposure time.........................................................................................................17
4.2 Exposure time in the automatic setting mode........................................................................17
4.2.1 Film number and exposure time in film mode for short cone/4 mA/60 kV ..............17
4.2.2 Film number and exposure time in film mode for long cone/4 mA/60 kV ................18
4.2.3 Film number and exposure time for short cone/7 mA/60 kV ...................................18
4.2.4 Film number and exposure time for long cone/7 mA/60 kV .....................................19
4.2.5 Film number and exposure time for short cone/4 mA/70 kV ...................................19
4.2.6 Film number and exposure time for long cone/4 mA/70 kV .....................................20
4.2.7 Film number and exposure time for short cone/7 mA/70 kV ...................................20
4.2.8 Film number and exposure time for long cone/7 mA/70 kV .....................................21
4.2.9 Sensor sensitivity number and exposure time (for short cone/4mA/60kV)...................21
4.2.10 Sensor sensitivity number and exposure time (for long cone/4mA/60kV) ..................22
4.2.11 Sensor sensitivity number and exposure time (for short cone/7mA/60 kV) ................22
4.2.12 Sensor sensitivity number and exposure time (for long cone/7mA/60kV) ..................23
4.2.13 Sensor sensitivity number and exposure time (for short cone/4mA/70 kV) ...............23
4.2.14 Sensor sensitivity number and exposure time (for long cone/4mA/70kV) ..................24
4.2.15 Sensor sensitivity number and exposure time (for short cone/7mA/70 kV)................24
4.2.16 Sensor sensitivity number and exposure time (for long cone/7mA/70 kV) .............. 25T

5 Parts replacement ........................................................................................................26
5.1 Head...........................................................................................................................................26
5.2 Power PC board........................................................................................................................27

-3-
Adjustment required after parts are replaced
Following two kind of adjustments are necessary if head or PC board is replaced.
Replaced part Timer PC Power PC Filter PC
Head
Adjustment board board board
Change the CP value as indicated on the head
Not Not
yoke. Necessary Necessary
Necessary Necessary
[Refer to section 3.3.]
Automatic adjustment of preheating power Not
Necessary Necessary Necessary
[Refer to section 3.6.] Necessary

Error Code
2.1 Error Code: E.00
Meaning
The exposure switch was released during x-radiation.
To release
Press either button for teeth selection.
Measures
Explain that the operator must continue pressing the exposure switch until the exposure light goes out (and
alarm stops sounding).
If not resolved
Possible cause
Contact fault occurred in the exposure switch or contact failure occurred due to disconnection in a curl cord
of a hand switch in the middle of exposure.
Verification
Replace the exposure switch or the hand switch from the timer PC board and check continuity of the
cables. (Pay special attention to the cord bush and connectors.)
Solution
Replace the exposure switch or the hand switch if any failure is found.

2.2 Error Code: E.01
Meaning
The exposure switch was pressed within three seconds after power-on.
The exposure switch was pressed within ten seconds after previous exposure.
To release
Release the exposure switch to restore the original state.
Solution
Explain that the operator must wait to press the exposure switch during three seconds after power-on (until the
ready light is on) and that exposure is allowed only after an interval 50 times the length of the last exposure
time.
If not resolved
Possible cause
Contact fault occurred in the exposure switch or contact failure occurred due to disconnection in a curl cord
of a hand switch in the middle of exposure.
Verification
Replace the exposure switch or the hand switch from the PC board and check continuity of the cables.
(Pay special attention to the cord bush and connectors.)
Solution
Replace the exposure switch or the hand switch if any failure is found.

-4-
2.3 Error Code: E.02
Meaning
The exposure switch was pressed when the line voltage was less than 90% of the rated voltage.
To release
Release the exposure switch to restore the original state.
Verification
Measure the voltage between L and N of the power supply terminal block.
Solution
Increase the line voltage using a step-up transformer if the supply voltage is less than 90% of the rated voltage.
If not resolved (or if line voltage is within 10% of rated voltage.)
Possible cause 1
The monitoring voltage for power supply is misadjusted.
Verification (See photo 1)
Turn off the main power switch.
Set the multi-meter at AC voltage range. Measure the
voltage (a) between L and N of the power supply
terminal block.
Set the multi-meter at DC voltage range. Connect the
+ probe to the TP24 (PWR-MON) and