(t)  
Push the ACTUATED indicator to change it to black.

 (u)  
Push the TEST 2 button on the E-11 shelf. 1) Make sure the ACTUATED indicator changes to white.

 (v)  
Push the ACTUATED indicator to change it to black.

 S 844-059
 (3)  
Put the airplane in its initial condition.

 (a)  
Remove pressure from hydraulic system A and B, if it is not necessary (AMM 29-15-00/201).

 (b)  
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 P.  Test for the M1190 Circuit Card (Engine Speed Detector)_______________________________
 S 844-060
 (1)  
Prepare for the test:

 (a)  
Make sure the ground locks are installed on all the gear (AMM 32-00-01/201).

 (b)  
Supply electrical power (AMM 24-22-00/201).

 (c)  
Supply hydraulic power to systems A and B (AMM 29-15-00/201).

 (d)  
Open these circuit breakers on the P6 panel:
 1) ENG #1, N2 TACH IND
 2) LDG SYS XFR VALVE - SECONDARY CONTROL

 (e)  
Open the left fan cowl panel on Engine #1 (AMM 71-11-02/201).

 (f)  
Disconnect electrical connector D552 from the N2 sensor (AMM 77-12-00/501 for location).

 (g)  
Connect the applicable cable from the test box to the D552 connector.

 (h)  
Connect a function generator to the mating receptacle on the test box.

 (i)  
Close the ENG #1, N2 TACH IND circuit breaker on the P6 panel.

 (j)  
Supply a 467.5 Hz signal 3.0 |0.5v ac signal as measured on the DVM terminal on the test box.

 NOTE: The voltage on the voltmeter will vary with the
____ frequency selected. Keep the input voltage to the test box at 3 volts so the system parameters stay constant.
 1) Make sure the N2 LED display shows 25 |0.1% N2. 2) Make sure the pointer shows 25 |0.5% N2.
 (k)  
Open the LDG GEAR SYS XFR VALVE - PRIMARY CONTROL circuit breaker on the P6 panel.

 (l)  
Close the LDG GEAR SYS XFR VALVE - SECONDARY CONTROL circuit breaker on the P6 panel.

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 ALL  ú ú 02 Page 418 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (m)  Move the landing gear lever to the OFF position.
 S 724-061
 (2)  
Do a test of the M1190 circuit card:

 (a)  
Adjust the function generator until the N2 tach for engine no. 1 shows 60%.

 (b)  
Push and hold the GROUND SENSING test switch on the E-11 shelf.

 1)  Make sure the ACTUATED indicator on the E-11 shelf stays black.

 (c)  
Decrease the frequency on the function generator until the N2 tach for engine no. 1 shows 40%. 1) Make sure the ACTUATED indicator on the E-11 shelf changes

 to white.

 (d)  
Release the GROUND SENSING test switch on the E-11 shelf.

 (e)  
Push the ACTUATED indicator to change it to black.

 (f)  
Close the LDG GEAR SYS XFR VALVE - PRIMARY CONTROL circuit breaker on the P6 panel.

 (g)  
Open the LDG GEAR SYS XFR VALVE - SECONDARY CONTROL circuit breaker on the P6 panel.

 (h)  
Push and hold the GROUND SENSING test switch on the E-11 shelf. 1) Make sure the ACTUATED indicator changes to white.

 (i)  
Release the GROUND SENSING test switch.

 (j)  
Push the ACTUATED indicator to change it to black.

 S 844-062
 (3)  
Put the airplane in its initial condition.

 (a)  
Remove the test equipment: 1) Close the LDG GEAR SYS XFR VALVE - SECONDARY CONTROL circuit breaker on the P6 panel. 2) Open the ENG #1, N2 TACH IND circuit breaker on the P6 panel. 3) Disconnect the test cable from the N2 sensor connector, D552 and connect D552 to the N2 sensor.

 4)  Close the ENG #1, N2 TACH IND circuit breaker on the P6 panel.

 (b)  
Close the left fan cowl panel on Engine #1 (AMM 71-11-02/201).

 (c)  
Remove pressure from hydraulic system A and B, if it is not necessary (AMM 29-15-00/201).

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