EPSON Stylus PHOTO 895/785EPX/915/825
Revision B
Operating Principles
Electrical Circuit Operating Principles
45
2.2.1 C408 PSE board
The power supply boards of Stylus PHOTO 895/785EXP/915/825 use a RCC (Ringing
Chalk Converter) circuit, which gen42VDC for drive line and +5VDC,
+3.3VDC for logic line to drive the printer. The application of the output voltage is
described below.
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, +3.3VDC by the chopping regulator
IC of the secondary circuit.
Figure 2-18. C408 PSE Board Block Diagram
The C408 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.
Table 2-7. Application of the DC Voltages
Voltage
Application
+42VDC
• Motors (CR Motor, PF Motor, ASF motor)
• Printhead common voltage
• Printhead nozzle selector 42V drive voltage
+5VDC
• C408/C498 MAIN control circuit logic
• Sensor
+3.3VDC
• C408/C498 MAIN control circuit logic
ZC-RCC converter
•
Over current protective
function
•
Over voltage protective
function
•
Secondary side SW
function with delay circuit
•
Power saving mode applied
5V Chopper
Circuit
3.3V
Chopper
Circuit
+42VDC
+5VDC
+3.3VDC
PSC signal from
Main board
Energy
saving
signal
Smoothing
Circuit
C51, C52
D51
TRANS (T1)
Main Switch
Circuit
Over Current
Protection
Filter Circuit
Full Wave
Rectifier
Circuit
Smoothing
Circuit
C11
DB1
L1, C1
F1, TH1
AC Input
Q1
Содержание Stylus Photo785EPX
Страница 1: ...EPSON STYLUSPHOTO895 785EPX 915 825 Color Inkjet Printer SEIJ01001 SERVICE MANUAL ...
Страница 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Страница 31: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 55: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 69: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 116: ...C H A P T E R 5 ADJUSTMENT ...
Страница 137: ...C H A P T E R 6 MAINTENANCE ...
Страница 146: ...C H A P T E R 7 APPENDIX ...
Страница 168: ...04 PM 790PT EPSON STYLUS PHOTO 785EPX 895 10304 Rev 02 No 5 08 09 10 07 For ESP ECC ETT 02 05 01 ...
Страница 175: ...EPSON STYLUS PHOTO 825 915 331 451 450 A C498 ELEC 001 Rev 01 No 03 200 300 330 A ...
Страница 179: ...Except ETT 714 ESPON STYLUS PHOTO 825 915 C498 MECH 004 Rev 01 No 07 706 710 736 704 708 718 705 712 702 701 703 X ...
Страница 180: ...752 751 753 719 126 757 129 754 746 No 08 Rev 02 EPSON STYLUS PHOTO 825 915 126 760 128 C498 MECH 0051 715 ...
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