Epson LQ-1170 Service Manual page 103

REV.-A
5.3 REPAIR OF THE POWER SUPPLY BOARD
This section describes problems that indicate that the power supply board is defective, and
various symptoms, likely causes, and checkpoints. Checkpoints refer to power waveforms, resistance
values, and other values to be checked to evaluate the operation of any component that might be bad.
Check these values and take the appropriate action.
The power switch for this printer controls the secondary (AC) power circuit. The primary (AC) circuit
is continually active as long as the printer is connected to AC power.
W A R N I N G
Table 5-4. Repair of the Power Supply Board
5 - 1 4
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