─
10
─
Power light (LED 1)
Description of the error display
9. Troubleshooting
Work precautions
• When servicing, reproduce the malfunction two or three times before starting repairs.
• When servicing, always take care to keep proper footing.
• Before starting the service, always unplug the power cord from the outlet, or turn off the circuit breaker when
no power cord plug is provided. Sufficient care must be taken to avoid electric shock or injury.
• Make sure to connect the power supply wires correctly.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• When circuit board failure is considered to be a cause, check closely for any broken section on the copper
foil patterns, burning or discoloration of parts.
• After replacing a circuit board, make sure to restore the same settings as before the replacement.
The part names in the text are standardized with the part names in the parts catalog. (There are some
exceptions.)
Model name of the circuit boards
Power circuit board
JT-37P2H
Control circuit board
JT-37M2H
Sensor circuit board
JT-37S
Ex: “Motor abnormality 1” blinks 3 times
<Blinking cycle>
0.4 sec
2.4 sec
Blinking…(predetermined number of blinks)
Blinks for 0.4 seconds
Light turns off for 0.4 seconds
Light turns off
(Light turns off
for 2.4 seconds)
Malfunction location quick reference chart
(The malfunction location is indicated by the LED lighting status.)
: Lit : Unlit : Blinking (ON for 0.4 seconds/ OFF for 0.4 seconds)
Description
Power light
(LED1)
Main cause of error
Normal
When normal
–
Tamper prevention
30-second continuous operation
(automatic return)
Abnormal
Ɣ
ż
Power-supply detection abnormality
2 blinks
Power-supply noise
(automatic return)
Motor abnormality 1
3 blinks
Motor: lock/connector detached
Motor abnormality 2
4 blinks
Motor: brush life limit/brush abnormality
Power circuit board temperature abnormality
5 blinks
Power circuit board: high-temperature/low-temperature
(automatic return)
Control circuit board temperature abnormality
6 blinks
Control circuit board: high-temperature/low-temperature
(automatic return)
Microcomputer abnormality
7 blinks
Microcomputer abnormality (Control circuit board)
Power-supply OFF/fuse melting
Power-supply OFF, electric current fuse and temperature fuse melting
