Sharp PR-45M, Service Manual

Page: 4 / 25

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