8. CHECKING PROCEDURE
■
Check for a broken heater
or sensor
■
Replacing the fuse
1. Check for a broken heater or sensor
Verify the electrical integrity of the heater and
sensor.
Measure the resistance of the heater and sensor
while at room temperature
（
15
〜
25℃
；
59
〜
77℉
）
.
It should be 3.4 Ω ±10%. If the resistance exceeds
these limits, replace the tip.
1. Unplug the power cord from the power receptacle.
2. Remove the fuse holder.
3. Replace the fuse.
4. Put the fuse holder back in place.
WARNING
Unless otherwise directed, carry out these procedures with the power switch OFF and
the power UNPLUGGED.
Measure the resistance across this position.
27
1
4
8
2
6
5
7
3
■
Checking the connection
cord for breakage
■
Checking the grounding
line
Checking the connection cord for breakage
1. Unplug the connection cord from the station.
2. Disassemble the heating element. {Please
refer to [Replacing the heating element
(heating core)]}
3. Measure the resistance values between the
connector and the lead wires at the socket as
follows:
Pin1
････････････
Red (
Socket
)
①
Pin2
････････････
Green (
Grounding line
)
⑤
*
Pin3
････････････
Black (
Switch board)
②
Pin5
････････････
Yellow (
Switch board
)
③
Pin6
････････････
Purple (
Switch board
)
④
Pin8
････････････
Brown (
Socket
)
①
If any value exceeds 0 Ω or is ∞, replace the
connection cord.
* For information on the plug 2, refer to “
■
Checking the grounding line
”)
1. Measure the resistance value between Pin 2
and the nozzle.
2. If the value exceeds 2 Ω (at room tempera
-
ture), perform the nozzle maintenance. If the
value still does not decrease, check the
connection cord for breakage.
28
Black
Switch board
Grounding
line
Socket
Green
Brown
Red
Yellow
Purple
①
②
③
④
⑤
