72 Functional information Q1860-90918
Power supply system
Ac/dc power distribution
The ac line voltage for the printer is applied through the main switch (SW101) and supplied to the
low-voltage power supply circuit through the fuse (F1). The low-voltage power supply divides the
ac voltage to +24 Vdc, +5 Vdc and +3.4 Vdc and supplies them to the dc controller PCA. This
circuit generates a zero-cross signal (ZEROX) and supplies it to the dc controller PCA.
+3.4 Vdc is supplied to ICs on the formatter, the dc controller PCA, and the BD PCA. +5 Vdc
is supplied to the laser driver PCA and sensors.
+24 Vdc is supplied to the high-voltage power supply circuitry on the dc controller, driving the
main motor, the exhaust fan, the scanner motor, the clutches, and the solenoids.
+24 Vdc is divided into +24 Vdr, which stops when the top cover is opened and SW401 on
the paper-handling PCA turns off, and +24 V, which is always supplied regardless of whether
SW401 turns on or off.
Figure 10. Low-voltage power supply circuit
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