Make sure that the voltage between test pins A and N is
 0.024 |0.010 volt dc.
 2)  AIRPLANES WITH PRESSURE CONTROLLER CPC21; Make sure that the voltage between test jacks 1 and 13 is
 0.056 |0.010 volt dc.
 (e)  Slowly move the control knob from DECR to INCR to DECR and measure the changes in voltage. 1) AIRPLANES WITH PRESSURE CONTROLLER CPC22;
 Make sure that the voltage changes between test pins A and N from 0.005 |0.005 volt dc at DECR to 0.165 |0.050 volt dc at INCR.
 2)  AIRPLANES WITH PRESSURE CONTROLLER CPC21; Make sure that the voltage changes between test jacks 1 and 13 from 0.008 |0.005 volt dc at DECR to 0.350 |0.050 volt dc at INCR.
 (f)  Make sure that the changes in voltages from the DECR adjustment to the INCR adjustment are smooth and linear.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
HINGED
COVER
TEST JACK NO.
CPC22 CPC21
A
1 B
2 C
3 D
4 E
5 F
6 G
7
H 8
J
9 K
10 L
11 M
12 N
13 P
14 R
15 S T U
A
737-300/400/500MAINTENANCE MANUAL
SEE C SEE B
PRESSURE CONTROLLER
SEE A
PRESSURE CONTROLLER CPC21  PRESSURE CONTROLLER CPC22 
TEST  A  A 
JACKS 

123456 BA M 789 CP NL DRVUK
10 1112 13 14 15
ST
EJ
FG H

B C
MODE FUNCTION EXAMINED (COMPONENT) MAN MANAUTO STANDBY
AC DC
CABIN RATE (SELECTOR PANEL)
X FLT ALT (SELECTOR PANEL)
X LAND ALT (SELECTOR PANEL)
X BARO CORRECT - AUTO MODE (AIRCRAFT COMP)
X CAB ALT (SELECTOR PANEL)
X BARO CORRECT - STBY MODE (AIRCRAFT COMP)
X FLT - GRD SWITCH (SELECTOR PANEL)+ AIR - GRD SAFETY SWITCH (AIRCRAFT COMPONENT)
X X X
X AIR DATA COMPUTER ALTITUDE REF (AIRCRAFT COMPONENT) (MERCURE USES SERVO ALTIMETER) *X
*X AC ACTUATOR (OFV) BRAKE VOLTAGE (CONTROL/OFV)
X
X AC ACTUATOR (OFV) CLUTCH VOLTAGE (CONTROL/OFV)
X X X
X DC ACTUATOR (OFV) CLUTCH VOLTAGE (CONTROL/OFV)
X
X AC ACTUATOR (OFV) MOTOR VOLTAGE (CONTROL/OFV)
X
X GROUND
X X X
X STANDBY RATE LIMITER AUTO RATE LIMITER
X UNUSED UNUSED UNUSED
* CAN BE AUTO OR STANDBY
Pressure Controller Test Pin Function Chart Figure 501
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 725-015
 (2)  Do this test of the potentiometer wiper (test pin B or test jack 2) for the flight altitude:
 (a)  
Set the mode selector switch to AUTO.

 (b)  
Set the FLT ALT control to these adjustments and make sure the voltages measured agree with the voltages shown.

 NOTE: Make sure that the FLT ALT control knob releases control
____ after you push it to make a new adjustment. It will turn freely and not change the FLT ALT numbers when it is released.
 ~....................................................... | ALTITUDE (feet) | VOLTS dc (|0.1) | ......................................................... | +4,000 | +16.65 | ......................................................... | +12,000 | +12.26 | ......................................................... | +20,000 | +8.86 | ......................................................... | +36,000 | +4.33 | 2..........................…............................1
 S 725-016
 (3)  Do this test of the potentiometer wiper (test pin C or test jack 3) for the LAND ALT control:
 (a)  
Set the mode selector switch to AUTO.

 (b)  
Turn the LAND ALT control from -990 thru 000 feet and do a check for smooth linear changes in voltage.

 (c)  
Set the LAND ALT control to these adjustments and make sure the measured voltages agree with the voltages shown. ~....................................................... | ALTITUDE (feet) | VOLTS dc (|0.1) | ......................................................... | -500 | +8.31 | ......................................................... | +400 | +7.68 | ......................................................... | +1,400 | +7.00 | ......................................................... | +2,400 | +6.34 | ......................................................... | +3,400 | +5.70 | ......................................................... | +4,400 | +5.08 | ......................................................... | +5,400 | +4.48 | 2..........................…............................1
　
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