Epson LX-850 Specifications Page 166
- Page / 176
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Table A-5. NPD7810/7811 Port Functions
Pin
Signal Direction
Descriptions
1-8 PAO-7
In/Out
Port A 8-bit
1/0
with output latch.
1/0
possible with mode A (MA) register.
Output
HIGH.
9-16
PBO-7
In/Out
Port B 8-bit
1/0
with output latch.
1/0
possible with mode B (MB) register.
Output HIGH.
17-24
PCO-7
In/Out Port C 8-bit 1/0 with output latch. Port/control mode can be set by mode
control C
(MCC)
register. Output HIGH.
25 NMI
In
Non-maskable interrupt of the edge trigger (trailing edge).
26
INT
1
In
Maskable interrupt input of the edge trigger (leading edge). Also used
as the AC input zero cross detecting terminal.
27,29
MODE
In/Out 781 1: O = LOW and 1 = HIGH
1,0
7810 modes set according to external memory (see Table A-2).
28
RESET
In
LOW reset
30,31
X2,X1
. . .
Crystal connection for built-in clock pulse. When clock pulses are
supplied externally, input must be to X 1.
32
Vss
. . .
Supply voltage,
Vss,
OV
33 AV
SS .
Analog
Vss
34-41
ANO-7
In
8 analog inputs of the AID converter. AN7-4 can be used as the input
terminals to detect the leading edge and to set the test flag upon
detection of the trailing edge.
42
VAref
In
Reference voltage.
43 AVCC
. . .
Analog
Vcc
44
RD
out
Read strobe. LOW at the read machine cycle and at reset, HIGH at other
times.
45 WR
out
Write strobe. LOW during the write machine cycle and at reset, HIGH
at other times.
46
ALE
out
Address latch enable. Latches the lower B address bits to access external
memory.
47-54
PFO-7
Port F
781 1: Port bit-by-bit 1/0 possible by mode F register. In extension mode
gradual address output assignment is possible in accordance with the
size of external memory. See Table A-3.
78 10: By setting mode O and 1, assignment to the address bus (AB 15-8)
can be made in accordance with the size of the external memory. The
remaining terminals can be used as
1/0 ports.
See Table A-4.
55-62
PDO-7
Port D
781 1: Port bit-by-bit 1/0 possible. In extension mode, PD7-O acts as the
multiplexed address/data bus
(AD7-0).
78 10: Multiplexed address\data bus to access external memory.
63
V DD . . Supply voltage, VDD
+5V
64
Vcc
. . .
Supply voltage,
Vcc
+5V
A-5
- LX-810/850 1
- PRECAUTIONS 3
- REVISION TABLE 5
- TABLE OF CONTENTS 6
- CHAPTER 1 7
- GENERAL DESCRIPTION 7
- FEATURES 9
- Hardware Specifications 11
- Si_k&lL 12
- Figure 1 14
- Cut-Sheet Printing Area 14
- 3mm min 16
- Printing Columns 19
- See Table 1-10 19
- 1.3 INTERFACE OVERVIEW 20
- 1.4.1 DIP Switch Settings 23
- SELECTYPE 24
- FUNCTION 24
- TEAR-OFF 25
- FUNCTION 25
- 1.8 OPERATING INSTRUCTIONS 26
- 1.8.3 Buzzer Operation 28
- Beeps indefinitely until 28
- 1.6 MAIN COMPONENTS 30
- Control Panel 31
- 1.6.5 Housing 33
- 1-15. Housing 33
- CHAPTER 2 34
- PRINCIPLES OF OPERATION 34
- 2.1 OVERVIEW 37
- Optional 38
- Interface 38
- && 40
- <o—————u 41
- ‘Usir+km+=l 44
- ● EEPROM 45
- ● Power supply circuit 45
- 2.2.1.1 TA Filter Unit 47
- Figure 2-13 48
- 12V DC Power Supply Circuit 48
- Frb’+a*b 49
- Feedback Circuit 51
- Im_IL’’’’ompara’or 53
- UPC494C 54
- 2.2.2 Reset Circuit 56
- Power-off Reset 57
- : Driving Pulley 58
- PD78 10HG 59
- Figure 2-27. SLA7020M Circuit 61
- ““’’’-r’”’ 63
- Table 2-3. Reference Voltage 64
- ON then 66
- ON to IOFF 66
- ON increases 67
- D voltage reaches the 67
- D voltage 67
- C Phase D 68
- -f-e’’Jw-JL&aau 69
- --JvLODJm-J_ 70
- @~{’aperTe~~~~~~~con.ear 71
- ~>TractOrReductiOn 72
- Printhead 75
- This section describes the 75
- operation 75
- $:q:&J1-n—rL 78
- Figure 2-48 79
- 2.2.6 Host Interface 80
- 2.2.8 Ribbon-feed Mechanism 82
- CHAPTER 3 83
- OPTIONAL EQUIPMENT 83
- Cat. No 85
- X-ON/X -OFF 86
- 3.2 CUT SHEET FEEDER C80612* 88
- (0.0039 inches) 89
- 8.5mm(0..33”) 90
- Cut Sheet Feeder Mode 92
- E#j’::::d/w 93
- ‘. . . 94
- E-ring (6) 95
- Figure 3-7. E-Ring Removal 96
- PULL TRACTOR 100
- (@-ring’” 102
- Marks to ‘be Matched 103
- CHAPTER 4 104
- DISASSEMBLY, ASSEMBLY, AND 104
- ADJUSTMENT 104
- LIST OF FIGURES 104
- LIST OF TABLES 106
- JiMwf!3a 108
- DISASSEMBLY AND REASSEMBLY 109
- Casing Removal -1 111
- 4.2.2.2 113
- 3. Remove 115
- (M3 X 6) 115
- Removal of Printer Mechanism 116
- Remove the GND spring 117
- PaDer Guide 118
- Frame (R) 122
- Flat Spring 124
- Shaft Ground 125
- NOTES FOR REASSEMBLY: 129
- Home Position Sensor 130
- NOTES FOR REASSEMBLY 132
- CHAPTER 5 135
- TROUBLESHOOTING 135
- 5.1 GENERAL 136
- UNIT REPLACEMENT 136
- (5) Abnormal Control 143
- UNIT REPAIR 145
- Check point 148
- Solution 148
- Problem Symptom 150
- Symptom Cause 152
- Check point Solution 152
- Printer Mechanism Repair 153
- ● Replace the 154
- 6.1 PREVENTIVE MAINTENANCE 157
- APPENDIX 160
- /APD7810HG 163
- <,”> 165
- (AD7-0) 166
- A.1.2 E05A30 (3B) 168
- SRAM (3D) 170
- A.1.5 SLA7020M (1A) 172
- A.1.6 pPC494C (3A) 173
- A.2 EXPLODED DIAGRAMS AND 174
- SCHEMATICS 174
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