Sharp FO 4400 - B/W Laser - All-in-One Service Manual Page 104
- Page / 190
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
FO-4400U
FO-CS1
5 – 14
(5) Speaker amplifier
The speaker amplifier monitors the line under the on-hook mode, out-
puts the buzzer sound generated by SUB ASIC, ringer sound, DTMF
generated from the modem, and line sound.
(4) Scanner control block
1) Image signal process block
The CIS is driven by MAIN ASIC (IC6), and the output video signal from
the CIS is input into IC6 through the amplifying circuit.
The ADC and buffer are provided in IC6, and the digital image process-
ing is performed.
2) Mechanical control block
The mechanical control block is mainly composed of MAIN ASIC to con-
trol the following.
(a) Scanner motor control
The revolution speed and timing of the scanner motor are controlled to
output the control signals to the motor driver (IC3).
(b) Verification stamp and LED lamp control
On/off of the end verification and LED lamp of CIS is controlled with
the software.
CIS
VIDEO
SIGNAL
AMPLIFIER
CIRCUIT
MAIN ASIC
(IC6)
CLOCK
Fig. 5
(6) Page memory block
W986416DH or MT48LC4M16A2TG (IC5): pin-54, TSOP
(64 Mbit SDRAM)
The page memory block is composed of one SDRAM of 64 Mbits, being
commonly used as the image memory. The memory is divided into the
page memory for the scanner and the page memory for printing.
This memory is controlled by the MAIN ASIC directly.
The page memory for scanner is composed of the partial area of IC5.
The image data of approx. one page (except in the super fine mode) of
the draft read with the scanner can be stored. They are stored until they
are contracted by CODEC function in MAIN ASIC.
The page memory for printing is composed of the remaining areas of
IC5 and can store approx. one page of the image data decoded by
CODEC function in MAIN ASIC. The data are stored until they are trans-
ferred to Printer PWB with the SUB ASIC and printed.
(7) Driver block
Sending motor driver (IC3: LB1845) ---- 28-pin DIP
This IC driver at the sending motor at the constant current with the bipo-
lar, chopper system.
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
PHASE2
VREF2
ENABLE2
I02
I12
CURRENT CONTROL
BLOCK
SENSE2
E2
ONE
SHOT
RC2
OUTPUT
BLOCK
PHASE1
VREF1
ENABLE1
I01
I11
CURRENT CONTROL
BLOCK
E1
SENSE1
ONE
SHOT
RC1
TSD
D-GND
GND
OUT2A
OUT2B
OUT1A
OUT1B
VCC
28
671 8 9
25
26
24
22
23
3 2 27 11 15 16 12 13
20
21
19
17
18
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
4
VBB
14
Fig. 6
[Truth Table]
ENABLE PHASE OUTA OUTB
LHHL
LLLH
H – OFF OFF
Note: When ENABLE = H or I0 = I1 = H, the output is in OFF state.
I0 I1 Output Current
L L Vref/ (10 x RE) = IOUT
H L Vref/ (15 x RE) = IOUT x 2/3
L H Vref/ (30 x RE) = IOUT x 1/3
HH 0
- SERVICE MANUAL 1
- FACSIMILE 1
- CONTENTS 2
- [1] Specifications 4
- [2] Life of consumable 4
- [3] Operation panel 5
- [4] Transmittable documents 6
- [5] Installation 7
- Attach a letter or 9
- SPEED DIAL 14
- CHAPTER 2. ADJUSTMENTS 15
- MEMORY CLEAR ? 16
- S W 0 1 = 0 0 0 0 0 0 0 0 17
- Soft switch mode screen 17
- PANEL CHECK MODE 18
- ALL KEY OK !! 18
- : Speed dial number 19
- HHHHHHHHHHHHHHHHHHHH 20
- • Blank paper aging mode 21
- 4. Soft switch description 24
- • Soft switch 24
- [3] Troubleshooting 49
- [4] Error code table 50
- 2. Service call error massage 51
- Super G3 mode 51
- [1] Mechanical description 53
- [2] Printer description 54
- 8. LASER EXPOSURE 57
- 9. DEVELOPMENT 57
- 9-1. Overview 57
- Temperature (°C) 58
- 12. PRINT SEQUENCE 59
- 13. Timing chart 60
- 13-1. Print Starting 60
- 13-2. Print Ending 60
- 2 Rear cabinet 62
- PWB plate, Right cabinet 63
- 4 PWB unit 64
- Inner left cabinet unit 67
- 9 Power supply PWB 68
- Scanner frame unit (1/2) 69
- Scanner frame unit (2/2) 70
- Document guide upper unit 71
- Operation panel unit 71
- 13 Upper cover 72
- Wire treatment 73
- High voltage PWB unit (HV1) 74
- Main motor (M1) 75
- Fusing unit (1/2) 77
- Heater Lamp 78
- Voltage Mark 78
- Paper cassette (FO-CS1) 79
- Cassette case unit 80
- Drive system unit (FO-CS1) 81
- Cassette cabinet (FO-CS1) 82
- Cassette case (1/2) (FO-CS1) 83
- Cassette case (2/2) (FO-CS1) 84
- (FO-45VS) 85
- CHAPTER 4. DIAGRAMS 87
- [1] Circuit description 91
- FO-4400U 100
- (3) Modem block 101
- (2) Backup memory block 101
- 0 I1 Output Current 104
- E) = IOUT 104
- E) = IOUT x 2/3 104
- E) = IOUT x 1/3 104
- 2. Waveforms 105
- CPU block 110
- MAIN CPU 111
- HD6417706F133 111
- Main ASIC block 112
- IC5 SDRAM 113
- MT48LC4M16A2TG-75/ 113
- W986416DH-7 113
- Sub ASIC block 114
- R284 10K 115
- Memory block 4/12 116
- Modem block 5/12 117
- LCD controller block 7/12 119
- Connector block 1 9/12 121
- Connector block 2 10/12 122
- Connector block 3 11/12 123
- Connector block 4 12/12 124
- [2] LIU PWB circuit 1/1 127
- M38079EFFS_12MHZ 130
- Printer PWB circuit 2/2 131
- HEATER ON 134
- HEATER-RELAY OFF 134
- INTERLOCK 134
- Power Supply PWB parts layout 135
- Joint PWB 138
- No. DESCRIPTION PARTS CODE 139
- C LED PWB unit DCEKP425CXHI1 139
- [1] G3 Protocol 144
- [2] Super G3 Protocol 145
- [3] Power On Sequence 146
- CHAPTER 8. OTHERS 147
- Fig. 5 Connected cable 149
- FO-4400 PC 150
- PARTS GUIDE 151
- [5] Document guide upper unit 156
- [4] Operation panel unit 156
- [10] Drive/Transfer unit 162
- PARTS CODE 163
- DESCRIPTION 163
- I n d e x 183
- © 2002 BY SHARP CORPORATION 190
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