Service Manual

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USB driver
IC401
USB
connector
D-
D+
OE, RCV, VP, VM
Suspend, VMO
VPO
ASIC
Centronics
connector
IEEE1284
driver
IC403
ASIC
Noise filter
circuit
Rush current
prevention circuit
Rectifying/
smoothing
circuit
Inverter circuit
(Flyback converter system)
Rectifying/
smoothing circuit
(Semiconductor switch)
Rectifying/
smoothing circuit
Rectifying/
smoothing circuit
+12V regulator IC
(with ON/OFF function)
Overcurrent
protection circuit
Control
circuit
Constant-voltage
detection circuit
(Semiconductor switch)
+3.3V
regulator IC