S 745-090-002
 (5)  
Do a check of the engine N2 tachometer input to the SMC:

 (a)  
Push the down button on each SMC.

 (b)  
Set the engine No. 1 N2 indicator to 0% (0 Hz) and the engine No. 2 N2 indicator to 0% (0 Hz).

 (c)  
Make sure that the N2 value on each SMC display is 0 |5%.

 (d)  
Set the engine No. 1 N2 indicator to 80% (1496 |1 Hz) and the engine No. 2 N2 indicator to 80% (1496 |1 Hz).

 (e)  
Make sure that the N2 value on each SMC display is 80 |5%.

 (f)  
Set the engine No. 1 N2 indicator to 0% (0 Hz) and the engine No. 2 N2 indicator to 0% (0 Hz).

 S 085-091-002
 (6)  
Remove the stall warning system tester and the synthesizer/function generators.

 S 425-092-002

 (7)  
Connect the electrical connector D546 to the N1 sensor and D552 to the N2 sensor on each engine.

 S 415-093-002

 (8)
Close the fan cowl panels on engines 1 and 2 (Ref 71-11-02/201).

 N.
Engine Tachometer Inputs Test with DC Power Supplies

 NOTE: If you use dc power supplies to do the Engine Tachometer Inputs
____ Test, do not do the section above, Engine Tachometer Inputs Test with Stall Warning System Tester.
 S 485-039-002
 (1)  
Connect a dc power supply for the engine N1 signals:

 (a)  
Remove the EIS primary display panel (Ref 31-42-01/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STALL MANAGEMENT ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b) (c) (d)  Connect a 0-5V dc power supply to the N1 indicator connectors D10092 pins 15 (+) and 16 (gnd) and D10094 pins 15 (+) and 16 (gnd).Connect 28V dc to connector D10092 pin 19 with a jumper.Connect 28V dc to connector D10094 pin 19 with a jumper.
 S 745-041-002
 (2)  Do a check of the N1 tachometer input to the SMC: (a) Push the down button on each SMC. (b) Adjust the power supply to 0.17 |0.04V dc (this is the same as an N1 speed of 0%). (c) Make sure that the N1 value on each SMC display is 0 |5%. (d) Adjust the power supply to 3.27 |0.04V dc (this is the same as an N1 speed of 80%). (e) Make sure that the N1 value on each SMC display is 80 |5%. (f) Adjust the power supply to 0V dc.
 S 085-042-002
 (3)  Disconnect the power supply and the jumpers.
 S 485-045-002
 (4)  Connect the 0-5V dc power supply to the N2 indicator connectors D10096 pins 13 (+) and 14 (gnd) and D10098 pins 13 (+) and 14 (gnd).
 S 745-047-002
 (5)  Do a check of the N2 tachometer input to the SMC: (a) Push the down button on each SMC. (b) Adjust the power supply to 0.17 |0.04V dc (this is the same as an N2 speed of 0%). (c) Make sure that the N2 value on each SMC display is 0 |5%. (d) Adjust the power supply to 3.27 |0.04V dc (this is the same as an N2 speed of 80%). (e) Make sure that the N2 value on each SMC display is 80 |5%. (f) Adjust the power supply to 0V dc.
 S 485-048-002
 (6)  Disconnect the power supply.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STALL MANAGEMENT ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 425-051-002
 (7)  
Install the EIS primary display panel (Ref 31-42-01/401).

 O.
SMC - EFIS Interface Test

 S 865-036-002
 (1)  
Move the flaps to the 1-unit position.

 S 865-055-002

 (2)  
Set the IRS L and IRS R mode selector switches (aft P5 overhead panel) to the NAV position.

 S 865-094-002

 (3)  
Set the IRS transfer switch (forward P5 overhead panel) to the NORMAL position.

 S 865-095-002

 (4)  
Set the EFI transfer switch (forward P5 overhead panel) to the NORMAL position.

 S 715-096-002
　
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