AX1500J(S)
6 – 9
[8] Check and remedy in the event of malfunction
1. List
✩
Before starting the P.W.B. unit replacement, make sure to refer to “Before replacing the Printed Wiring Board” in page 2-2.
2. Check in the event of a fuse F10A blowing
When the fuse F10A was blown, observe the following instruction:
There are many high voltage components in the oven, therefore, except for performing operational check, unplug the power cable before starting
work. For the harness, check for poor caulking, poor connection, etc.
Operation
Trouble
YES:
Action
Even
with plug-
ged in
When
heating
operation
started
No display
Is there a voltage of about 230 - 240V between the oven lamp terminals.
YES: Replace the oven lamp.
NO: Replace the control unit.
Has the harness between the control unit (CN-D) and the display unit (WH-A) been connected?
NO: Connect the harness.
The door switch is in the door open position (Even with the door closed, the oven lamp does not go out.).
YES: Adjust the door switch.
NO: Replace the control unit or display unit.
Is there a voltage of 230 - 240V for the AC fan or 24 V for the DC fan?
YES: Replace the fan motor.
NO: Replace the control unit.
YES: Adjust the latch.
NO: The latch switch is in the door open position.
The rotary knob does not
function.
No sound
The START key does not
function.
Is there a voltage of about 230 - 240V between the tube pump motor terminals.
YES: Replace the pump unit assembly.(Check the tube pump motor.)
NO: Replace the control unit.
The tube pump motor does
not run.
Has the water tank been inserted all the way?
NO: Insert the water tank or replace the tank or the tank spring.
Replace the control unit.
Reset occurs.
Is there a voltage of about 230 - 240V between the terminals of each of the supersteam heater, engine heater
and convection heater?
Raeplace the engine unit assembly (when the supersteam heater does not function).
Replace the engine unit assembly (when the engine heater does not function.
Replace the convection heater (when the convection heater does not function).
The supersteam heater
does not function.
The engine heater does not
function.
The convention does not
function.
The fan motor does not run.
The oven lamp does not il-
luminate.
(Note that the lamp
goes out after five (5) minutes
from opening the door.)
(Note that the lamp is off during
PROOF mode and DESCALING
mode.)
No backlight for display
illuminates
No key is valid.
Even with the water tank filled
with water, "Fill water tank" is
indicated and heating does not
start.
Has the oven been not operated for 3 minutes or more?
Others
NO: Replace the control unit.
Replace the display unit.
Replace the display unit.
Replace the display unit.
YES: Open and close the door.
NO: Has the fuse F10A blown?
YES: Refer to "Check in the event of F10A fuse blowing".
NO: Check the display unit, fan motor thermal cut-out,
convection thermal cut-out and engine thermal cut-out.
YES: Replace the control unit or display unit.
YES: Replace the WL joint or the control unit.
YES: Do not use distiled water (ion charged water/ pure water) or Ro water.
Use water suitable for drinking (filtered).
NO
YES
YES
NO
Replace the inverter unit.
(Function is normal.)
Check is finished.
(The fuse has blown.)
Replace the secondary interlock switch.
Replace the monitor switch and fuse 10A.
Poor insulation of the low voltage parts,
Is there continuity between the COM and NO terminals of the secondary interlock switch when the
door is opened?
Is there continuity between the monitor switch terminals when the door is closed?
Disconnect the 230 - 240 volt supply (terminals AC3 and M) to the inverter unit. Operate the oven
