Snack - Based Troubleshooting and Repair Guide
September, 2002 Page 19 of 54 1670065
Checking Continuity
You can use the multimeter to check for shorted or open electrical circuits.
1. Remove all power from the circuit under test and discharge all capacitors.
2. Set the selector to Ohms (Ω).
3. Touch the test leads across the circuit you want to measure. Depending on your multime-
ter, a buzzer sounds if the circuit resistance is less than about 50 Ohms (meaning the cir-
cuit is continuous or shorted). Otherwise look for a low resistance reading on the display.
4. Touch the test leads across the circuit you want to measure. Depending on your multime-
ter, a buzzer sounds if the circuit resistance is less than about 50 Ohms (meaning the cir-
cuit is continuous or shorted). Otherwise look for a low resistance reading on the display.
C.) Testing For Proper Input Voltage and Noise
1. Voltage Check - Place the leads of a voltmeter across the LINE (LIVE) and NEUTRAL
terminals of the wall receptacle. The voltmeter should indicate 110-130 volts ac for 120
volt, 60 Hz locations, or 220-240 volts ac for 230 volt, 50 Hz locations.
2. Polarity Check - Place the leads of a voltmeter across the LINE (LIVE) and GROUND
terminals of the wall receptacle. The voltmeter should indicate 110-130 volts ac for 120
volt, 60 Hz locations, or 220-240 volts ac for 230 volt, 50 Hz locations.
3. Noise Potential Check - Place the leads of a voltmeter across the NEUTRAL and
GROUND terminals of the wall receptacle. The voltmeter should indicate 0 volts ac. A
measurement greater than 1.5-2.0 volts ac could result in problems for the merchandiser's
electronic circuitry caused by electrical noise.
To Next Page
Loading...
Need help?
General
