Sharp SF-1020 Manual de Serviço Página 134
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2 Operation
• When "td" (= 30msec) passes after the voltage reaches 4.25V by
turning on the power, the output is drive to HIGH.
"td" is set by the external capacitor (C106).
Block diagram
(12) Operation panel
1 General
• The operation circuit is composed of the key matrix circuit and the
display matrix circuit.
Key detection: With the signal detected by Q1 ∼ Q7 and KI0 ∼ KI3
signal matrix at LOW (GND) and Q2 ∼ Q7 at HIGH (open), the
level of KI 0 ∼ KI3 is checked to judge whether key matrix 1, 2, and
3 are HIGH or LOW, judging on/off.
For Q2 ∼ Q7, switching is made every 2msec to judge each of
them.
R1
R2
1.25V
+
-
-
Power
5µA
reference
GND Delay capacity
Output
t
ta ta
H
L
Output not constant
ta = 30m sec
t
4.25V
0.65V
Power voltageOutput state
KI0
KI1
KI2
321
Q4
M66313
+5V2 +5V1
CPU
TD62504
12 – 15
- SERVICE MANUAL 1
- Contents 2
- [1] PRODUCT OUTLINE 5
- [2] PRODUCT SPECIFICATIONS 6
- 3. Supply parts 8
- 4. Optional specifications 9
- [3] PRODUCT VIEWS 11
- 11 12 13 12
- Clutches and solenoids 14
- 6. Rollers, mirrors, etc 17
- 1. Unpacking 18
- 2. Installation 18
- Grounding 19
- 4. Charger cleaning 20
- 5. Developing unit setting 21
- Hand carry strap 22
- Developing unit lever 22
- Front cabinet 22
- Copy tray 22
- 9. Center shift adjustment 24
- 10. Label attachment 24
- (SF-CM15) installation 25
- (SF-CM16) 26
- 16P connector 27
- 13. Tray paper size selection 28
- (Described with the SF-1020) 28
- 4. Attach the tray 29
- Roller release arm 30
- Paper feed roller shaft 30
- Paper feed roller 30
- 2. Developing section 31
- (3) Optical section 32
- • Brightness (F8.5) 33
- • Focus: (195mm ±1%) 33
- 2. Basic operations 35
- • Photo density copy mode 35
- (2) Dirt correction 36
- (4) Copy process 37
- (2) Process diagram 38
- Step 1 (Main Charging) 39
- Step 2 (Exposure) 39
- Step 3 (Development) 40
- Step 4 (Transfer) 41
- Step 5 (Separation) 41
- Step 6 (Cleaning) 42
- Step 7 (Discharging) 42
- (6) Process control function 43
- Process control 44
- Process control timing 44
- Drum marking 44
- Basic structure 44
- (5) TRANSPORT/FUSING SECTION 45
- (6) Fusing paper exit section 45
- Thermo control 46
- (DDM rotary encoder sensor) 47
- [6] DISASSEMBLY AND ASSEMBLY 48
- 1-3. PS front roller ass’y 49
- 1-4. Separation roller 49
- 2. Transport unit 50
- PS mylar 51
- 3. Fusing section 52
- Optical adjustment plate 54
- Mirror base B 56
- Mirror base positioning plate 57
- No.2/3 mirror unit 57
- Horizontal scales 58
- Projections 58
- 6) Lens wire replacement 60
- L drive pulley 61
- Lens unit 61
- Notch in the optical 62
- 5. High voltage section 63
- 6. Process section 64
- 7. Developing section 67
- MAG roller 68
- 9. Frame major parts 69
- 9-2. Power unit 70
- 9-3. Tray size detecting PWB 70
- (SF-2020) 71
- 10-1. Separation roller 72
- Clearance gauges 75
- 2. Optical system 76
- 2-2. Note for adjustments 77
- No.4/5 drive holder 78
- • When the lens is replaced 79
- Lens value label 80
- Zooming cam 81
- 10 20 90 100 110 82
- G. Vertical skew adjustment 84
- H. Horizontal skew adjustment 84
- Mirror base rail handle 85
- Loosen Loosen 85
- 1 scale = 1mm 85
- I. Center shift adjustment 86
- K. Copy lead edge adjustment 87
- • RRC-A = 6.151 × (L1 – L2) 88
- 10 20 30 40 89
- [8] SIMULATION 91
- 4. List of simulations 92
- Cassette size switch table 93
- 5. Details of simulations 94
- 0.5s 0.5s 0.5s 95
- 0.5s 0.5s 96
- PD1 PD2 PD3 PD4 PD5 PD6 102
- Document lead eddge 102
- 4 Set the obtained values 108
- 6. User simulation 110
- (2) User simulation 111
- [9] SELF DIAGNOSTICS 112
- PLACEMENT 115
- 4. Set value recording sheet 117
- 5. Memory simulation list 118
- [11] MAINTENANCE 119
- [12] ELECTRICAL SECTION 120
- Power ON 121
- (1) Block diagram 122
- SC3041K12F 123
- 4 Internal block diagram 124
- (3) I/O (IC8) CXD1095Q 127
- 1 General 127
- 2 Features 127
- 3 Pin arrangement 127
- DTA123YS 130
- 2 Operation 132
- M51953 BL 133
- (12) Operation panel 134
- HOUND AC CIRCUIT 135
- (14) ADU circuit description 136
- (2) ADU CPU (IC1) 137
- Phase B Phase B 139
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