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2. Diagnostic Information
Start
Make a quick visual check for defects (loose or broken parts, unplugged connectors, paper jams, and so on).
Voltage, Ground, And Continuity Readings
Voltage Readings
All DC voltages must be within +5% through
When a “Line Voltage” measurement is to be performed, the voltage on United States and Canada printers should be between 100 V ac and 127 V ac. On World Trade printers, the voltage is according to each country’s specification.
Ground Checks
To check for a correct ground, measure the voltage between the ground and a known good voltage source. The voltage measurement must be the same as the source voltage to consider that the ground is correct. Continuity measurements may be used to check grounds, however, be sure to measure to a known good ground using the lowest ohms scale and check for zero ohms.
CAUTION: Always unplug the power cord before doing any continuity measurement.
Continuity Readings
When measuring continuity, be sure no back circuits affect the measurement. If necessary, unplug connectors to remove any back circuits. Zero the ohm range on the lowest scale (X1). An open circuit will read infinity. A circuit with correct continuity will read zero ohms.
Diagnostic Information
