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Page Title:
TESTING RESISTOR-DIODE SUPPRESSOR |
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 TABLE 6-2. TROUBLESHOOTING (Cont'd)
Symptom
Probable Cause
Corrective Action
Forward and Reverse Travel Noise Cont'd)
2. Adapter noise while
a.
Defective gear or
a.
Overhaul adapter (paras.
under power or
pinion in adapter.
6-107 through 6-118).
coasting.
b.
Defective bearing in
b.
Overhaul adapter (paras.
adapter.
6-107 through 6-118).
defective and must be replaced.
3.
Disconnect one terminal, and momentarily
connect ohmmeter, set to 10K resistance range, across
6-20.
TESTING
SPEED
CONTROL
terminals. Meter Needle will rapidly increase towards
POTENTIOMETER.
Disconnect connector from
zero, then gradually increase towards infinity reading if
accelerator control, and proceed as follows:
capacitor is good. If meter indicates zero resistance, or
fails to swing towards zero, capacitor is defective and
1.
Connect ohmmeter to plug wires 27 and 28.
must be replaced.
With accelerator pedal up reading will be 15 ohms or
less.
6-17.
TESTING
RESISTOR-CAPACITOR
SUPPRESSOR (1SP and 2SP). Use ohmmeter set to
2.
Depress accelerator slowly. Resistance will
RX100K ohm scale, and connect across suppressor
increase smoothly to a final value between 1350 and
section. Meter will swing (kick) up-scale towards zero
1650 ohms.
then slowly swing towards infinity. If meter does not
respond, or indicates zero resistance, suppressor is
3.
Connect ohmmeter to plug wires 28 and 29.
defective and must be replaced.
With accelerator pedal up, reading will be between 1350
and 1650 ohms.
6-18.
TESTING RESISTOR-DIODE SUPPRESSOR
(3SP). Use ohmmeter set to RXIK range, and connect
4.
Depress accelerator pedal slowly. Resistance
meter across suppressor section. Meter will indicate
will decrease smoothly to approximately 15 ohms.
less than 2,000 ohms in one direction, and near infinity
in the other direction on good suppressor. If not,
5.
If proper resistance measurements are not
suppressor is defective and must be replaced.
obtained, loosen set screw and adjust to obtain above
measurements.
6-19.
TESTING
ZENER
DIODE-DIODE
SUPPRESSOR (3SP and 4SP). Ohmmeter connected
6.
If ohmmeter measurements are erratic or
across suppressor will indicate near infinity resistance in
jerky, potentiometer is defective and must be replaced.
both directions on good suppressor. If not, suppressor is
TABLE 6-3. RECOMMENDED EQUIPMENT
Name
Manufacturer or Type
VOM (volt-ohm-millimeter)
Simpson or trippett 20,000 ohm/
volt portable meter.
Earphone
Similar to those used with
transistor radios.
Socket Wrench Set
Sizes to 3/4 inch.
Torque Wrench
150-pound inches.
Continuity Test Light
3-volt test light.
Heat Transfer Compound
Dow Corning no. 340 or equivalent.
Resistor
500 ohm 1/4 or 1/2-watt.
6-14
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