Tester 522684-01 - Pontiac FIREBIRD 1972 Service Manual

1B-24 1972 PONTIAC SERVICE MANUAL
TROUBLE SHOOTING PROCFDURE ATC PROGRAMMER
7
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ABNORMAL STEP B C IF USING A.T.C. TESTER.
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ABNORMAL STEP
10
OR I 1 IF USTNG A.T.C. T E S T T R O R
IF TEST B , D, F, G2, I INDICATE PROGRAMMER MALFUNCTION.
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LEAD GOOD
CHECK FINGER BAR ASSEMBLY FOR BENT CONTACT FINGERS (FINGERS SHOULD B E SLIGHTLY BENT NEAR PLASTIC BODY) OR BURNED CONTACTS.
CONTACTS SHOULD
BE AGAINST CONDUCTOR PATH OF ROUND CIRCUIT BOARD.
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I
FINGER BOARD OK
]
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REPLACE AMPLIFIER
CHECK FOR SLIPPAGE OF ROUND CIRCUIT BOARD,NOTCH SHOULD ENGAGE
PROTRUSION OF WHEELS. CONDUCTOR SIDE OF WHEEL SHOULD B E UP.
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]CHECK GROUND LEAD ASSEMBLY CIRCUIT BOARD MOUNTING SCREW NEAREST PROGRAM WHEEL. SHOULD HAVE A GROUND LUG UNDER IT.
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FINGER BAR ASSEMBLY DEFECTIVE
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BEARINGS OK
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EMOVE FINGER BLOCK AND CIRCUIT BOARD. CHECK BALL BEARINGS UNDER BOARD. THERE SHOULD B E ONE BEARING I N
EACH OF THE FOUR RETAINING CUPS I N THE WHEEL.
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GEARS AND/OR MOTOR DEFECTIVE
1
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CHECK MOTOR POWER RESISTORS AS FOLLOWS. MEASURE WlTH A N O H M METER THE RESISTANCE TO GROUND OF THE
GREEN LEAD AND ALSO THAT OF THE ORANGE LEAD. BOTH SHOULD B E APPROXIMATELY 1 2 OHMS.
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[
REPAIR OR REPLACE BOARD]
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RESISTANCE OK /RESISTANCE VERY HIGH
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RESISTANCE ABOUT 35 OHMS INSTEAD OF 12
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1
INSTALL BEARINGS I N PROPER POSITIONS
1
1
REPLACE GEARS
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IF WORM GEAR DEFECTIVE MOTOR MUST B E REPLACED.
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CHECK TO INSURE PIN OF VACUUMVALVE IS LOCATED I N GROOVE OF WHEEL. IT WILL B E NECESSARY TO REMOVE
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LUB WlTH BEACON GREASE AS NECESSARY
WHEEL I N ORDER TO ACCOMPLISH THIS. FOLLOW SEPARATE INSTRUCTIONS FOR PROGRAMMER WHEEL REMOVAL.
B E SURE SCRIBE MARKS ARE MADE O N POTENTIOMETER CLIP AND WHEEL AS CALLED FOR BEFORE REMOVING WHEEL.
piK&Gg
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REPLACE RESISTOR(S)
]
Fig. 1 B-2 1
Trouble Shooting Procedure
-
ATC Programmer
tive to changes in temperature and its resistance values
change inversely to temperature change. When the tem-
perature increases, the resistance value of the sensor de-
creases; or when the temperature decreases, the resistance
value of the sensor increases.
Two sensors, the in-car sensor and the ambient sensor and
switch assembly (Fig. 1B-22), form the sensor string
which is wired in series with the temperature potentiome-
ter on the control panel to form a voltage divider network
that supplies a signal to the base of the first transistor in
the amplifier. This amplifier is located in the programmer
assembly. The B Series ambient sensor is independent of
the ambient switch. The sensor is mounted in the evapora-
tor case while the switch is mounted behind the headlamp
filler panel and grille.
ASPIRATOR
HOSE PORT
IN-CAR SENSOR
AMBIENT
SENSOR &SWITCH
Fig. 1B-22 Typical In-Car Sensor and Ambient Sensor and
Switch