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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b) If the adjustment is in the range of the coarse and vernier adjustment, use the adjustment terminals:
NOTE: The coarse adjustment terminals are on the right
____
side of the EGT resistor. The vernier adjustment
terminals are on the left side of the EGT resistor.
1) Move the airplane lead from one coarse adjustment terminal to a different coarse adjustment terminal.
NOTE: The circuit resistance must be in the range of
____
the vernier adjustment.
2) Move the airplane lead from one vernier adjustment terminal to a different vernier adjustment terminal.
NOTE: The circuit resistance must agree with the
____
values in Table 501.
3) Disconnect the wheatstone bridge or the multimeter from the resistance circuit.
(c) If the adjustment is above the range of the coarse and vernier adjustment, use the resistance spool:
NOTE: This step will decrease the circuit resistance.
____
1) Disconnect the wheatstone bridge or the multimeter from the resistance circuit.
2) Install a jumper between pin 1 and pin 2 on the connector for the EGT indicator.
NOTE: The jumper must be copper wire with a resistance
____
value less than 0.05 ohms.
3) Connect one airplane lead to the coarse adjustment
terminal (B2).
4) With the soldering iron, disconnect the end of the
resistance spool wire from the vernier adjustment
terminal B3.
5) Connect one lead of the wheatstone bridge or the multimeter to the vernier adjustment terminal B3.
6) Wind off the necessary quantity of wire to get the correct resistance.
NOTE: 1 foot of the wire is equal to 0.7 ohms.
____
7) Remove sufficient insulation from the resistance wire to
make a good connection with the lead for the wheatstone
bridge or the multimeter.
8) Connect the other lead of the wheatstone bridge or the
multimeter to the resistance wire.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
9) Move the lead of the wheatstone bridge or the multimeter
down the resistance wire until you find the correct
resistance value.
NOTE: As the lead of the wheatstone bridge or the
____ multimeter moves down the resistance wire, remove the insulation from the resistance wire.
10) Cut the resistance wire at the location for the correct
resistance value.
11) Remove the wheatstone bridge or the multimeter from the
resistance circuit.
12) Make sure you remove all the insulation from the resistance wire.
13) Wind up the unwanted resistance wire in the resistance
spool and one time around the center post.
NOTE: Let a sufficient length of the resistance wire
____ stay so you can solder the resistance wire to the vernier adjustment terminal B3.
14) With the soldering iron, connect the end of the resistance wire to the vernier adjustment terminal B3.
15) Remove the jumper from pin 1 and pin 2 of the connector for the EGT indicator.
16) Do step 3.C.(5) to make sure the circuit resistance agrees with Table 501.
(d) If the adjustment is below the range of the coarse and vernier adjustment, use the resistance spool:
NOTE: This step will increase the circuit resistance.
____
1) Disconnect the wheatstone bridge or the multimeter from the resistance circuit.
2) Install a jumper between pin 1 and pin 2 on the connector for the EGT indicator.
NOTE: The jumper must be a copper wire with a
____
resistance less than 0.05 ohms.
3) Connect one airplane lead to the coarse adjustment terminal A3.
4) Connect the other airplane lead to the vernier adjustment terminal B2.
5) With the soldering iron, disconnect the ends of the
resistance spool from the coarse adjustment terminal A5
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