Belmont 900 Series Operating instructions

Troubleshooting
In the case of a trouble, please see troubleshooting below, so it may help you to solve the problem or to find
the solutions. The troubleshooting described speculates on various problems. If the problems or symptoms
are not listed here, please contact Takara Belmont.
CAUTION:
Please make sure disconnect power supply line before repair or replace defective parts. If not, it may cause
injury from electrical shock. Special care must be taken when repairing the chair motor, capacitor, solenoid
valve and power supply cable which parts are operated with high voltage.
High voltage parts
* Unit in j-box : power cable, power switch, fuse, air switch, terminal block, transformer, Noise filter,
900LED Power supply PCB.
* Chair : Motor, capacitor, solenoid valve, power cable, chair PCB (input voltage).
In the case of the repair of the chair hydraulic circuit. Make sure that the hydraulic circuit is not pressurized
before removing the hydraulic parts such as motor, solenoid valve and cylinder.
Remove the chair to lowest end and fully reclined position for unpressurized chair position by “LIMIT
MODE”.
Table of Contents
900LED Dental Light Troubleshooting
Book No. 1E05K7A0
Detal of Sensor Control PCB.
Intensity volume lower limit adjustment

900LED Dental Light Troubleshooting
Defective
Part
Symptom Check Point Possible Cause Solution
Check the sensor/manual (mode selection switch) on the
cuspidor front panel
Sensor/manual switch (mode selection switch) is off Select manual or sensor mode
Check harness between 900 power pcb (CN204) and
sensor/manual mode switch (1:Pink, 2:Bright green)
Disconnection or break of harness if no continuity Repair or replace harness
Check LED module Damage LED module Replace LED module Assy
Check input voltage of LED module (approximately
DC20V)
Disconnection or damage the harness between 900 power
pcb and LED module if there is no power
Repair or replace harness
There is power (current voltage) on the terminal block on
j-box connecting to 900 power pcb > Defective noise
filter section or 900 power pcb.
Replace noise filter or 900 power pcb
There is input power (current voltage) to 900 power pcb
(CN101) > Defective 900 power pcb.
Replace 900 power pcb
Check the touch less switch Dirty sensor cover Clean the sensor cover (Toush less sensor surface)
Check sensitivity of touchless sensor Improper setting of sensitivity Adjust sensitivity screw on the touch less sensor pcb.
Check harness between sensor pcb (CN1) and sensor
control pcb (CN4) (1:Yellow, 2:Green, 3:Blue)
There is no continuity > Disconnection or damage of the
harness
Repair or replace harness
Check harness between 900 power pcb (CN202, 1:black,
2:White) and sensor control pcb (CN1,1:black, 3:white)
There is no continuity > Disconnection or damage of the
harness
Repair or replace harness
Check harness between sensor control pcb (CN6, 1: light
blue, 2:N/A.) and sensor/manual select switch
There is no continuity > Disconnection or damage of the
harness
Repair or replace harness
Clean the sensor cover (Toush less sensor surface)
Check fixing position of touchless sensor (pcb) >
Replace touchless sensor (pcb)
Can't not improved from above action > Defective sensor
control pcb.
Replace sensor control pcb.
LED2 (Yellow) on the sensor control pcb is not light up
when pass your hand to touchless sensor or continuously
light up before pass your hand to touchless sensor
16.Dental
Light 920
Light does not turn on
at both manual and
sensor mode
Check input power of 900 power pcb
Light does not turn on
at sensor mode
Check operation of touchless sensor
2 / 5 150830

900LED Dental Light Troubleshooting
Defective
Part
Symptom Check Point Possible Cause Solution
Check the sensor/manual (mode selection switch) on the
cuspidor front panel
Light doesn't turn off even selected to OFF mode >
defective sensor/manual mode switch
Replace sensor/manual mode selection switch
Check operation of touchless sensor
LED2 (Yellow) on the sensor control pcb is not light up
or continuously light up when pass your hand to
touchless sensor
Check fixing position of touchless sensor (pcb) >
Replace touchless sensor (pcb)
Check display LED (Yoke section) If the display LED (green) is blinking > composite mode Switch to normal mode
Check status of sensor/manual select switch Mode becomes manual mode Switch to sensor mode
Check harness between intensity volume and LED display
pcb and sensor control pcb. (1:Red, 2:Orange, 3:N/A) *
Volume switch line
There is no continuity > Disconnection or damaged
harness
Repair or replace harness
Check around equipment
There is other equipment generated noise around dental
light
Turn off main switch and contact your dealer
Check around dental light
Malfunction occurs when light head close to room light >
room light affects touchless sensor
Turn off main switch and contact your dealer
Check LED module Break in the lead wire of LED module Replace LED module Assy
Check 900 power pcb Defective 900 power pcb Replace 900 power pcb
Head moves horizontally Head angle is not upright
Adjustment of head angle (refer to the separate
installation manual)
Balance arm moves up or down Misalignment of balance arm spring nut
Adjustment of balance arm spring nut (refer to the
separate installation manual)
Loose brake set screw (M5x2pcs) inside light pole
Adjust or tighten set screw (refer to dental light
manual)
Cuspidor section is not flat
Adjustment of cuspidor section (refer to the
installation manual)
Horizontal arm moves
16.Dental
Light 920
Light does not turn off
Can't adjust intensity
No constant light
intensity
(light flickers, Blinking
or only light up 5 LEDs
)
Light position is not
stable
3 / 5 150830

Detail of 900LED (300LED) Sensor Control PCB Sep-16
Setting of Dip Switchs (SW3 & SW4) and Jumper Pin (JP3)
901/902/
905
920S for
Clesta II
SP-CLEO2
920S for
CP-ONE
PLUS
1 OFF OFF OFF
2ON ON ON
3ON ON ON
4OFF OFF ON
5 OFF OFF OFF
6 OFF OFF OFF
7 OFF OFF OFF
8 OFF OFF OFF
PC PC 232
PC PC 232
LED blink setting of
Composite Mode
Sensor activation setting
OFF : Activate when a hand goes away.
ON : Activate when a hand comes in.
Includes Composite Mode
OFF :With Composite Mode, ON: Without Composite Mode
Speed setting of
communication line
OFF : 4800bps, ON: 2400bps
PC side: Clair Unit, 232 side: CP-One plus
Setting condition
No.
PC side: Clair Unit, 232 side: CP-One plus
SW3
SW4
OFF: Slow blinking, ON: Rapid blinking
JP3
Test mode ( Always OFF)
OFF : Normal operation, ON: Test operation
Transition time to
Composite mode (by a
sensor)
OFF : 1 second, ON: 2 seconds
Wake-up brightness setting
from light OFF condition.
OFF : 1. Composite Mode when a light is turned on by using a
sensor.
: 2. Keeps on getting on/off signal from dr table, light stays in
composite mode
ON : 1. Regular Mode when a light is turned on by using a sensor.
: 2. Keeps on getting on/off signal from dr table, light goes
into regular mode.
Combining dental unit
OFF : Clair unit, ON: CP-One plus
LED1
LED2
SW1
SW2
CN1
CN6
CN5
CN4
CN9
CN10
CN12
SW4
JP3
JP2
JP1
SW3
TP1_Measurement Pin (GND) of CN1
TP2_Measurement Pin (DC5V) of CN1
SW3 Dip Switch No1 to No8
CN11
TP1
TP2
LED1 (Green) _ PCB Power LED
LED2 (Yellow) _ Touch-less Sensor Signal LED
SW1_ VR lower limit setting
SW2_ Manual SW for operation test
SW3_ See below
SW4_ Type of communication (See below)
JP1,2_ writing program data
CN1_Input Power (DC5V)
CN4_To Touchless Sensor PCB
CN5_
To Display LED PCB (Display LED)
CN6_To Power PCB (PWM Output)
CN9_To Display LED PCB (Volume)
CN10_RS230 Communication (CP ONE PLUS)
CN11_PC Communication (Clesta II)
CN12_PC Communication (N/A)

Intensity volume lower limit adjustment
SW1
SW2
In the case of replacing the light head or sensor
control PCB. Set lower limit position of intensity
control volume into the sensor control PCB.
*Set to sensor mode and turn off light by touch
-
less sensor.
1. Turn intensity control volume to left end
2. Press SW1 [CHECK] once
3. Press SW2 [ON_OFF] once
Intensity
control
volume