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L A S E R
L A S E R
Section 4
Control Circuit Board
4-2
Time Chart
Sequence : MA-252 series
Basic Operation（normal operation 1）
ON/OFF sw
AUTO button
▲MIN. button
▼HOUR button
SET button
TIMER button
DAY SELECT button
POWER SAVER button
CLEAR button
CHILD LOCK button
Flame sensor
Bm speed sensor
Room thermistor
Igniter
Blower motor
Fuel pump
Fan motor
Buzzer
On lamp
Burning mode
indicator
AUTO
indicator
TIMER
indicator
POWER SAVER
indicator
CHILD LOCK
indicator
other
indicator
time
room temperature and set temperature
①RT＞ST
②RT＞ST+1.0℃
③RT＞ST+2.0℃
④RT≦ST
⑤RT≦ST-1.0℃
⑥RT＞ST+6.0℃
Title
26
S E R V I C E M A N U A L
H E A T I N G
H E A T I N G
Laser300 / Laser530 / Laser560 / Laser730
ON
Detected
Detected
⑤
T7
T1
T2
T3
T4
T9
ON
L1
H
M1
M2
M1
M2
H1
T5
T6
T21
H
M
A
Flash3
Lit
Flash1
FlashB
LitC
set temperature,room temperature
Flashing frequency
Flash1 : 2.0Hz
Flash2 : 0.5Hz
Flash3 : 1.0Hz
Buzzer
A :
on 100msec
B :
on 500msec
Class
S Y S T E M S
S Y S T E M S
Trouble Shooting
Fuel Recovery
ON
Within T23
①
②
④
T8
T8
T9
T9
H
M
L
M
H
H
M
L
M
T10
T10
H
M
L
M
H
B
A
Lit
Flash2
LitC
LitB
LitA
LitB
LitC
time
set temperature,room temperature
Burning mode indicator
A :
B :
C :
Remarks
Figure1
⑤
T11
H
M
H
M
B
Flash2
time
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Troubleshooting
