Chapter 2. Outline Of Driving Circuit - Sharp PR-45M Service Manual

CHAPTER 2. OUTLINE OF DRIVING
CIRCUIT
1. Block diagram & Connection diagram
1) Block diagram
PWB UNIT
CON6(6P)
J
6
MOTOR
CON1(40P)
CON2(9P)
CON4(4P)
Non-paper
detection
sensor(J)
FOR THERMAL HEAD
FOR ECR PWB
2) Connector table
Connect to the ECR PWB
CON1: <For ECR PWB>
Pin
PinNo. Signal Signal
No.
1 VHIN 2 NC
5 VJCOM 6 VJPFD
9 /JPFC 10 /JPFD
GND GND
13 14
17 /STB4 18 /STB3
21 VH 22 VH
25 CLK 26 /LAT
29 GND 30 GND
33 VRCOM 34 VRCOM
37 /RPFC 38 /RPFD
CON2: <For Thermal head connector A>
Pin Pin
Signal
No. No.
1 VH VH
2
4 CLK /LAT
5
7 /STB1 GND
8
CON3: <For Thermal head connector B>
Pin Pin
Signal
No. No.
1 GND 2 GND
4 TM 5 VDD (+5V)
7 /STB3 8 Din
10 VH
CON4: Not used
CON7(6P)
R
6
MOTOR
CON3(9P)
HEAD UP
SENSOR
CON5(2P)
Non-paper
detection
sensor(R)
FOR THERMAL HEAD
Pin Pin
Signal Signal
No. No.
3 NC 4 NC
7 /JPFA 8 /JPFB
11 /JPES 12 GND
TM VDD
15 16
(+5V)
19 Din 20 VH
23 VH 24 Dout
27 /STB2 28 /STB1
31 GND 32 /RPES
35 /RPFA 36 /RPFB
39 PHUPS 40 VHOUT
Pin
Signal Signal
No.
Dout
3
/STB3
6
GND
9
Pin
Signal Signal
No.
3 NC
6 /STB4
9 VH
CON5: <For Head up detector>
Pin
Signal
No.
1 PHUPS
CON6: <For Journal paper feed motor>
Pin Pin
Signal
No. No.
1 VJCOM 2 VJCOM
4 /JPFB 5 /JPFC
CON7: <For Receipt paper feed motor>
Pin Pin
Signal
No. No.
1 VRCOM 2 VRCOM
4 /RPFB 5 /RPFC
3) Thermal head block diagram
DOT #864
8, 9
VH
1, 2
GND
4 3
5
STB4
6
STB3
LATCH REGISTER
7
DI
SHIFT REGISTER
4
VDD
THERMISTOR
3
TM
The STB terminal is pulled
in the IC.
Connector B
Thermal head connector A
Pin No. Signal
1
VH
2
3 D out
4 CLK
5 /LAT
6 /STB2
7 /STB1
8
GND
9
Thermal head connector B
Pin No. Signal
1
GND
2
3 TM
4 VDD
5 /STB4
6 /STB3
7 D in
8
VH
9
Print data which has been entered through Din signal synchronization
with the CLOCK signal is stored in /LAT according to the timing (864
dots) of the /LATCH signal. Stored print data is output by the
/STROBE1, /STROBE2, /STROBE3, and /STROBE4 signals to ener-
gize the heating element. The print data (864 dots) is divided by four
STROBE signals into the following four parts before being output.
Pin
Signal
No.
2 GND-L
Pin
Signal Signal
No.
3 /JPFA
6 /JPFD
Pin
Signal Signal
No.
3 /RPFA
6 /RPFD
DOT #1
1, 2
VH
8, 9
GND
2 1
7
STB1
6
STB2
5
LAT
3
DO
4
CLK
Connector A
Description
Head application voltage
Data output signal
Clock signal
Latch Signal
Strobe Signal 2
Strobe Signal 1
GND
Description
GND
Thermistor detecting signal
+5V
Strobe Signal 4
Strobe Signal 3
Data input signal
Head application voltage