Epson Stylus Pro XL Service Manual Page 40
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- Table of contents
- TROUBLESHOOTING
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The figure below shows a block diagram of the power supply circuit (C137 PSB/PSE). The power
switch is equipped with a secondary circuit that allows the CPU to remain active for a while after
the printer is turned off. This allows the printhead to return to the capping position after power is
off. The CPU mounted on the C137 MAIN Board always monitors the PSC (power on/off) signal. If
this signal becomes LOW, the CPU resets each device after performing the head capping sequence.
Also, this board employs the RCC (ringing choke converter) switching system. This AC voltage is
first input to the filter circuit for higher harmonics absorption, and then input to the rectification
and smoothing circuit, converting it into DC voltage. This DC voltage is then input to the switching
circuit for the switching operation. Along with the switching operation on the primary side, +35
VDC is generated after passing through the +35 V line voltage detection circuit. This +35 VDC
output level is stabilized. This +35 VDC is also input to the +5 VDC generation circuit to generate a
stable +5 VDC.
1) +5 VDC line over voltage protection circuit
The output voltage level of +5 V line is monitored by a Zener diode (ZD53). If the voltage level
exceeds +7 V, the status is fed back to the primary switching circuit through a photocoupler (PC1)
to stop the +35 V generation.
2) +5 VDC line over current / over voltage control circuit.
The output current is monitored by a detection resistor (R53) and fed back to the +5 VDC
generation switching control IC (IC51), which monitors the output voltage. This information is
input to the internal comparater and outputs the high signal to turn off the transistor (Q51) when
the voltage or the current becomes abnormal.
3) +35 VDC line over voltage protection circuit
The output level is monitored by a Zener diode (ZD36). If the voltage level exceeds +36 V, a
photocoupler (PC1) is activated; stopping the primary switching circuit operation.
4) +35 VDC line drop protection circuit
The output level of +35 VDC line is monitored by a detection circuit that consists of a Zener diode
(ZD51 and ZD81 to 84). This circuit feeds back the output voltage level status through a photo-
coupler to the primary switching circuit to control the ON/OFF time of the switching transistor for
contast output voltage.
F1
L1, R1 C1-C4
DB1 C11
Q1
T1
C51
+35 VDC
ZD51, 81-84
TL 494
+5 VDC
ZD52
ZD53
PC1
ZD86,
C82
P-OFF Signal
Full-wave
Rectifier Circuit
Smoothing
Circuit
Filter Circuit
Fuse
Main Switching
Circuit
Feedback
Circuit
Transformer
Smoothing
Circuit
Drop Protection
Circuit
P-OFF Detection
and Delay Circuit
Over Voltage
Protection Circuit
Photo
Coupler
Over Voltage
Protection Circuit
Figure 2-16. Power Supply Circuit Block Diagram
Operating Principles Stylus Pro XL
2-14 REV.-A
- SERVICE MANUAL 1
- Chapter 1 Product Description 2
- 1.1 FEATURES 4
- Table 1-1. Interface Cards 5
- 1.2 SPECIFICATIONS 6
- Table 1-3. Character Tables 7
- 1.2.3 Paper Specifications 8
- Printable area: Cut sheets 9
- Envelopes 9
- 1-6 Rev.A 9
- Cut Sheets Envelopes 10
- Carriage Unit 10
- : Without condensation 11
- 1.2.7 Reliability 12
- 1.2.8 Safety Approvals 12
- 1.2.9 Physical Specifications 12
- 1.3 INTERFACE SPECIFICATIONS 13
- 1.4 OPERATIONS 16
- Indicators 17
- 1.4.3 Default Settings 18
- 1.4.3.1 Default Setting Items 18
- Table 1-17. Feature Selection 19
- Operate LED Data LED 20
- 1.4.4 Error Conditions 21
- Table 1-19. Error Indications 21
- 1.4.5 Printer Initialization 21
- 1.5 MAIN COMPONENTS 22
- 1.5.5 Housing 24
- Table of Contents 25
- List of Figures 26
- List of Tables 26
- 2.1 OVERVIEW 27
- 2.2.1 Printer Mechanism 28
- Micro Dot Printing mode 30
- CR Motor 31
- CR HP Sensor 31
- Carriage Guide Shaft 31
- Belt Pulley 31
- 2.2.3 Paper Feed Mechanism 32
- Table 2-5. Drive Terms 33
- 2.2.4 Ink System 34
- Drive: Pump Mechanism 35
- Drive: Switch Lever Set 35
- Drive: Paper Feed Mechanism 36
- Switch Lever: Reset 36
- Figure 2-12. Pump Operation 37
- 2.2.7 Wiping Mechanism 38
- 2.3.2.1 Reset Circuits 42
- 2.3.2.2 Sensor Circuits 42
- STROBE pulse 44
- 2-18 REV.-A 44
- Normal Dot Mode 46
- Drive Waveform 46
- Micro Dot Mode 46
- Block Resistor 46
- Micro Dot Printing Mode 47
- 2.3.2.6 DMA Controller 48
- CPU H8 (IC1) DRAM (IC5) 49
- 2.4 INK SYSTEM MANAGEMENT 50
- 2.4.1 Ink Operations 51
- 2.4.2.1 Protect Counter 53
- 3.1 OVERVIEW 56
- ATTENTION 56
- 3-2 REV.-A 57
- DISASSEMBLY/ASSEMBLY POINT 58
- C137 PNL Board 58
- Carriage Lock Lever 58
- CBB (M3x11) 58
- CBS (M3x8) 59
- C162 MAIN Board 59
- CBB (M3x12) 59
- ASSEMBLY POINT 61
- REQUIRED ADJUSTMENT 61
- Ink Cartridge 63
- Fixing Lever 63
- Cartridge Holder 63
- Figure 3-9. Printhead Removal 64
- 3.2.5.2 Carriage Unit Removal 67
- 3.2.5.3 Pump Unit Removal 68
- Cleaner Lever 69
- 3.2.5.5 CR Motor Removal 70
- 3.2.5.6 PF Motor Removal 70
- 3.2.5.8 PE Sensor Removal 71
- Paper Feed Roller 72
- 3.2.5.10 Upper Frame Removal 73
- Chapter 4 Adjustments 74
- 4.1 OVERVIEW 75
- Adjustments Stylus Pro XL 76
- Stylus Pro XL Adjustments 77
- Head Base 79
- Figure 4-5. Spacer Selection 80
- Spacer Name 87
- Thickness 87
- Figure 4-15. Spacer Selection 87
- 4.1.7 Platen Gap Adjustment 90
- Chapter 5 Troubleshooting 92
- Rev.-A 5-i 93
- 5.1 OVERVIEW 94
- Table 5-3. Error Codes 95
- 5.2.2 Error is detected 98
- Stylus Pro XL Troubleshooting 100
- Troubleshooting Stylus Pro XL 101
- Chapter 6 Maintenance 108
- 6.1 PREVENTIVE MAINTENANCE 109
- 6.2 SERVICE MAINTENANCE 110
- 6.3 LUBRICATION AND ADHESIVES 111
- 6-4 Rev.A 112
- Rev.A 6-5 113
- 6-6 Rev.A 114
- Appendix 115
- A.1 CONNECTOR SUMMARY 116
- Table A-1. Connector Summary 117
- Stylus Pro XL Appendix 118
- Appendix Stylus Pro XL 119
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