Epson SQ-B50/2550 Technical Manual page 74

REV.-A
2.2.3 Summary of the Power Supply Circuit
+12VDC
-12VDC
+24VDC ---·Vh
+5VDC ---·Vx
I
I
I
I
I
I
I
I
~
±12V
DC
----~~-
~----.
+24V
DC
Forward Converte Type
Swithing Regurator
+5V
DC
I
I
I
I
I
I
I
L
-
Power
Fuse Fi It er
Rectifire
Switch
t--
-
I--
(AC --. DC)
I--
_______ 1 _______
AC'0
Figure 2-3. Overview of Power Supply circuit Operation
Table 2-2. Power Supply Applications
Voltage Application
+5 V DC Circuit drive voltage
• Logic circuit
• Sensors
+24 V DC Printer mechanism drive
• Carriage motor drive voltage
• Paper feed motor drive voltage
• Pump motor drive voltage
• Release solenoid drive voltage
• TE motor drive voltage
• Valve solenoid drive voltage
+1-12
V CD
Optional I/F voltage
Vh Printhead drive voltage
Vx Protection voltage for abnormal power supply operation is detected
• Reset circuit
• Printhead data signal pull-up voltage
• TE motor phase data signal pull-up voltage
NOTE1: The voltage Vh is generated on the SEIMA board using the
+
24V DC power supply
NOTE2: The voltage Vx is generated on the SEIMA board using the
+
5V DC power supply.
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