(i)
If the J2 connector measurements are in the limits shown in
table 9 and problems with the N2 indication occurred, do the
troubleshooting procedure for the N2 indicating system
(AMM 71-00-54/101).
(j)
If the J1 connector measurements are in the limits shown in
table 9, replace the cable for the sensor of the N2 control
alternator (AMM 73-21-06/401).
(k)
If the J1 or J2 connector resistances are not in the limits
(table 9), do this task:
1) Replace the speed sensor for the N2 control alternator
(AMM 73-21-08/401).
(l)
Set PMC SRT switches 1, 2, 3, and 4 to position 0.
(m)
Remove the N2 control alternator test cable from N2 connectors J1 and J2 from the PMC SRT N2 connector.
(n)
Reconnect the engine wiring harness to the N2 control
alternator connectors J1 and J2.
(o)
Make sure the failure is corrected. Do N2 Control Alternator -Winding Resistance Test again.
S 765-080-C00
(5) N1 Fan Speed Sensor Resistance Test
(a)
Set PMC SRT switches 1, 2, 3, and 4 to position 0.
(b)
Make sure the Main Engine Test Cable is fully connected.
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(c)
Make sure the multimeter is in the limits for each position of the PMC SRT switch 3 (N1) (table 10).
~............................................................ | TABLE 10 | | N1 FAN SPEED SENSOR RESISTANCE TEST | .............................................................. | SWITCH 3 | | | | (N1) | | | | POSITION | TEST LIMITS | TEST POINT REFERENCE | .............................................................. | 9 |5K ohms minimum |P3-1 to cable shield P3-2 | .............................................................. | 10 |5K ohms minimum |P3-1 to ground | .............................................................. | 11 |40 - 90 ohms |P3-1 to P3-2 | 2..........…...................….............................1
(d)
If one or more test points is not in the limits (table 10), continue with instructions in paragraph below to connect the N1 test cable connector.
(e)
If all test points in the limits shown in table 10, this test is complete. 1) Set PMC SRT switches 1, 2, 3, and 4 to position 0. 2) Continue the test. Go to T12 Inlet Temperature Sensor
Resistance Test.
(f)
Connect the N1 test cable connector labeled PMC SRT N1 to the PMC SRT N1 connector. Connect the connectors labeled N1 AC and N1 PMC to the N1 fan speed sensor connectors AC1 and PMC.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(g)
Make sure the multimeter indication is in the limits for each position of the PMC SRT switch 3 (N1) (table 11).
~............................................................ | TABLE 11 | | N1 FAN SPEED SENSOR RESISTANCE TEST | .............................................................. | SWITCH 3 | | | | (N1) | | | | POSITION | TEST LIMITS | TEST POINT REFERENCE | .............................................................. | 12 |40 - 90 ohms |N1 pin 1 to N1 pin 2, PMC | | | |connector | .............................................................. | 13 |5K ohms minimum |N1 PMC pin 1 to N1 PMC | | | |connector case | .............................................................. | 14 |5K ohms minimum |N1 pin 1 to N1 pin 3, PMC | | | |connector | .............................................................. | 15 |5K ohms minimum |N1 AC pin 1 to N1 AC | | | |connector case | .............................................................. | 16 |5K ohms minimum |N1 pin 1 to N1 pin 3, AC | | | |connector | .............................................................. | 17 |40 - 90 ohms |N1 pin 1 to N1 pin 2, AC | | | |connector | 2..........…...................….............................1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 发动机燃油和控制(86)
