JUKI LK-1900AN Engineer's Manual page 124

Trouble
17. Error E905
Thermal error in SDC board
LED3 on SDC board: Flashing 13 times
18. Error E907
X-origin retrieval error
Cause (1)
17-1) Heat sink temperature 1-A) Failing in cooling.
of the SDC board has
exceeded 85°C.
1-B) The SDC board is out of or-
18-1) Irregular motor rota- 1-A) There are irregularities in the
tions
1-B) Motor leads are broken.
1-C) The MAIN board is out of
18-2) No sensor signal entry 2-A) The sensor is out of order or
Use of Test Mode
CP-1 or CP-2
2-B) The INT board connector is
2-C) Sensor mounting position is
Cause (2)
der.
mechanism, such as over-
loading, etc.
The motor is out of order.
order.
broken.
disconnected.
inadequate.
Check and corrective measures
Check whether electric box cooling is effec-
tive. Look for clogging around air suction
holes and check the fan, etc.
Replace the SDC board.
Check the mechanism and look for the sec-
tion that is particularly overloaded or whether
screws are loose.
Disconnect CN42 (white) of the MAIN board
and check the motor resistance. [See the Mo-
tor / Solenoid Circuit Diagram.] Replace the
motor.
Replace the MAIN board.
Check whether the sensor lamp is turned ON/
OFF when a metallic plate is moved closer
to or separated from the sensor plane. In the
case of no lamp ON/OFF, the sensor is bro-
ken or the connector block is disconnected.
Check the connection of CN62 (red) of the
INT board.
Check and correct the sensor mounting posi-
tion.