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Manuale delle Istruzioni
Craden DP9 Manuale delle Istruzioni Pagina 31
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Fig. 4.2 Printhead Drive Circuit
D
S
D
S
D
S
C
O
I
L
U13
Timer
U5
RCLK
SRCLR Q
Q26 TYP.
D23 TYP.
Q8
Q7
D6
Q5
Q4
U12
6
3
15
12
10
+38VDC
D34
D35
FIRE
NO CHOP
FIRE EXT
FIRE
NO CHOP
FIRE EXT
U5 PIN 15
U13 PIN 3
Q7 SOURCE
Q26 DRAIN
COIL
CURRENT
50V
--
--
70V
--
38V
(dashed li
nes are for re
vision F an
d later board
s)
26
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DP8 & DP9
1
DOCUMENT PRINTERS
1
TECHNICAL MANUAL
1
Document edge
10
Back to Table of Contents
11
4.0 THEORY OF OPERATION
26
4.1 OVERVIEW
26
Current
29
Control
29
4.2.4 Printhead Drivers
30
4.2.6 Sensors
30
4.2.7 Character Printing
30
5.1.4 Printhead Cleaning
33
5.3 ELECTRICAL ADJUSTMENTS
34
5.4 MECHANICAL ADJUSTMENTS
35
5.4.1 Printhead Gap
35
Roller Segments
39
Roller Shaft
39
Input Guide
39
Gate fingers
39
5.5 REPLACEMENT PROCEDURES
40
5.5.1 Cabinet
40
5.5.2 Main PCB
40
5.5.8 Document Motor
42
5.5.9 Printhead
42
5.5.10 Carriage Drive Belt
42
5.5.11 Document Drive Belt
42
5.6 TROUBLESHOOTING
43
5.6.2 No Display
43
5.6.3 Defective Keypad
43
5.6.4 Defective Sensor
44
5.6.5 No Document Motion
44
5.6.6 No Carriage Motion
44
5.6.8 Print Quality
45
5.6.9 Missing Dots
46
5.6.13 Diagnostic Flowchart
47
5.7 RECOMMENDED SPARE PARTS
48
Printer Diagram
49
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