Hakko Electronics 941, Instruction Manual

Page: 14 / 20

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Checking Procedure
WARNING:
Unless otherwise directed, carry out these procedures with the power switch OFF and the power UNPLUGGED.
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Check for a broken heater or
sensor 1. Check for a broken heater or sensor
Measure the resistance
across this position.
Verify the electrical integrity of the heater and
sensor.
Measure the resistance of the heater and
sensor while at room temperature (15 to 25°C.;
59 to 77°F.). It should be 5
Ω
±10%. If the
resistance exceeds these limits, replace the tip.
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Check the grounding line 1. Unplug the connection cord from the station.
2. Measure the resistance value between Pin 2
and the tip.
3. If the value exceeds 2
Ω
(at room temperature),
perform the tip maintenance described on p.12.
If the value still does not decrease, check the
connection cord for breakage.
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Checking the connection cord
for breakage
1. Remove the soldering tip and the nipple.
2. Push the socket out from inside the handle
assembly.
3. 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
handle assembly.
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Replacing the fuse
1. Unplug the power cord from the power recep-
tacle.
2. Remove the fuse holder.
3. Replace the fuse.
4. Put the fuse holder back in place.
CAUTION:
Do not lose the O-ring located inside the nipple.
When reassembling, match the convex part of the
handle assembly with the concave parts of the O-
ring spacer and socket.
Green Black
Socket
Red
White
1
4
2
5
3
13