EPSON Stylus Pro 3800/3800C/3850
Revision A
OPERATING PRINCIPLES
Outline of Circuit Boards
59
2.9.2 Power Supply Board
This section describes the power supply board that generates the power to operate this
printer.
CIRCUIT BLOCK DIAGRAM
The block diagram of C635 Power Supply board is shown below.
Figure 2-34. C635 Power Supply Board Block Diagram
CONTROL SIGNALS
There are three control signals between the C635 MAIN Board and the Power Supply
Circuit Board as shown in the table below.
Table 2-9. Control Signals
Signal Name
Function
Output
Remarks
PS Control
Signal (PSC)
Power ON
39.9 to 44.1 V
The PS unit outputs the rated voltage.
Power OFF
3V or less
The PS unit is instantly shut off.
Energy Save
Signal (ESAVE)
Normal
Operation
39.9 to 44.1 V
The PS unit outputs the rated voltage.
Power Saving
Operation
15V Typ.
It takes less than 500 msec to recover
from the power saving mode to the rated
voltage.
Overvoltage
Detection Signal
(OVP)
Detection of
overvoltage
0 V
(Power is
shutoff)
The power is shut off when the OVP
terminal voltage exceeds 7 V. To recover
from the status, lower the OVP terminal
voltage below 7 V, and reboot the printer
after reinserting the power plug into a
receptacle.
AC input
Input Filter
Pseudo-resonance type
separately-excited flyback
1. OCP function
2. OVP function
3. Secondary power
switch function
+42V/0.7A
5VOVP
ESAVE
PSC
DC
output
Control
signal
input
(Rush current
prevention
circuit
Summary of Contents for 3800 - Stylus Pro Color Inkjet Printer
Page 1: ...EPSONStylusPro3800 3800C 3850 Large Format Color Inkjet Printer S SERVICE MANUAL SEIJ06007 ...
Page 5: ...Revision Status Revision Date of Issue Description A November 30 2006 First release ...
Page 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 35: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 61: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 85: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Page 190: ...C H A P T E R 5 ADJUSTMENT ...
Page 250: ...C H A P T E R 6 MAINTENANCE ...
Page 262: ...C H A P T E R 7 APPENDIX ...
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