C417 Psb/Pse Board, C482 Psh Board - Epson Stylus C50 Service Manual

EPSON Stylus C50/C60/C61/C62

2.2.1 C417 PSB/PSE board, C482 PSH board

The power supply boards of the Stylus C50/60/C61/C62 use a RCC (Ringing Chalk
Converter) circuit, which generates +42VDC for drive line and +5VDC for logic line to
drive the printer. The application of the output voltage is described below.
Table 2-6. Application of the DC Voltages
Voltage
• Motors (CR Motor, PF Motor)
+36VDC
• Printhead common voltage
(Stylus C50)
• Printhead nozzle selector 42V drive voltage
• Motors (CR Motor, PF Motor)
+42VDC
(Stylus C60/C61/ • Printhead common voltage
C62)
• Printhead nozzle selector 42V drive voltage
• C418/C429/C483/C484 Main control circuit logic
+5VDC
• Sensor/LED
(Stylus C50/C60)
• C483/C484 Main control circuit logic
+3.3VDC
(Stylus C50/C60) • Sensor/LED
AC voltage input from AC inlet first goes through filter circuit that removes high
frequency components and is then converted to DC voltage via the rectifier circuit and
the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1
preforms the switching operation. By the switching operation of the primary circuit,
+42VDC is generated and stabilized at the secondary circuit. This +42VDC generated
by the secondary circuit is converted to +5VDC by the chopping regulator IC of the
secondary circuit.
Operating Principles
Application
Electrical Circuit Operating Principles
2.2.1.1 C417 PSB/PSE board
+42VDC +5VDC
IC51
+5V Regulator
R91,R92,R93,Q91,ZD51
+42VDC Line
Constant
Control
C51
Smoothing
Circuit
D51
TRANS(T1)
C11
Smoothing
Circuit
Over Current
Protection
F1,TH1
AC Input
Figure 2-18. C417 PSB/PSE board block diagram (Stylus C50/C60)
The C417 PSB/PSE board has the various control circuits to stop voltage output if a
malfunction occurs on the power supply board or the main board while the printer
mechanism is on duty. Following explains each control and protection circuit.
Revision C
PSC Signal
ZD53 from Main board
+5VDC Line
Over Voltage
Limitation
ZD52,87
+42VDC Line
Over Voltage
ZD90
Limitation
+42VDC Line
Drop Limitation
C84,Q84
Power Drop
Delay Circuit
PC1
Photo Coupler
Q1 Q2,Q3,Q31
Main Abnormally Feed
Switching back circuit
Circuit
Full Wave
Filter Circuit
Rectifier circuit
L1,C1 DB1
42