Sanyo abc-vw24 Service Manual page 13

Problem Diagnosis Chart
Sensors do not detect
during automatic operation
Will operate manually?
Yes
Which sensor is not detecting?
Odor sensor
Check
Is there anything in the room generating gas?
If there is, make it not generate gas.
E.g.: Paraffin stove, paint, or cosmetics
Ventilate the room
Reconnect power
* Wait until the automatic lamp
switches from flashing to lit
(about 3 minutes)
Set sensitivity to high and switch on
automatic operation
Release gas
* Use a gas lighter
Is the sensor working?
Yes
OK
* For automatic operation,
refer to "The Operation
of the Odor Sensor."
No
Dust sensor
Reconnect power and switch
on automatic operation
Shield the dust sensor so that
no sunlight or fluorescent
light shines directly upon it
Insert a needle into the
triangular part of the dust
sensor and move it lightly
Is the sensor working?
Is there about DC 5V between
1 – 4 of the dust sensor
connector (CN1)?
Was there any change in the
voltage between 1 – 4 of CN1
when the pin was inserted in
No
the triangular part of the dust
sensor and lightly moved?
Control circuit B (sensor)
inspection/ replacement
- 13-
Will not operate manually
Clean Indicator
* Because the dust sensor detects
reflected light, insert a pin or office
clip that reflects light in the
triangular part of the sensor.
Yes
No
No
Yes
No
Yes
ABC-VW24
Odor Sensor
Dust Sensor
OK
* For automatic operation,
refer to "The Operation
of the Odor Sensor."
Control circuit B (sensor)
inspection/ replacement
Surveillance sensor
inspection/ replacement