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7
8. MAINTENANCE
●
Tip maintenance
Please refer to the FM-202 Instruction manual.
●
Checking Procedure
WARNING:
Unless otherwise directed, carry out these procedures with the power switch OFF and the power
UNPLUGGED.
■
Verify the electrical integrity
of the heater and sensor
1. Check for a broken heater or sensor
Measure the resistance across the tip as shown.
Measure the resistance while at room
temperature(15 to 25
°
C; 59 to 77
°
F). It should
be 8
Ω±
10%. If the resistance exceeds these
limits, replace the tip.
Measure the resistance across this position
Tip ID
■
Check the grounding line
1. Unplug the connection cord from the station.
2. Measure the resistance value between pin 2
and the tip (both tips).
3. If the value exceeds 2
Ω
(at room tem-
perature), perform the tip maintenance
described on P.12 of the FM-202 instruction
manual. If the value still does not decrease,
check the connection cord for breakage.
■
Checking the connection
cord for breakage (Refer to
P.11 WIRING DIAGRAM of B
side.)
1. Remove the soldering tip and the handle.
2. Measure the resistance values between the
connector and the lead wires at the socket
as follows:
Pin 1 – Red
Pin 2 – Green
Pin 3 – Black
Pin 5 – White
If any value exceeds 0
Ω
or is
∞
, replace the
FM-2022.
1
4
7
2
8
5
6
3
Green
B side socket
Black
Red
White (inside)