Service manual

CHAPTER 2. OUTLINE OF DRIVING CIRCUIT
1. Block diagram & Connection diagram
1) Block diagram
2) Connector table
Connection to the ECR PWB
CON1: <For ECR PWB>
PinNo. Signal
Pin
No.
Signal
Pin
No.
Signal
Pin
No.
Signal
1
VHIN
2
–
3
–
4
–
5VJCOM 6VJCOM 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
1VH
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
1GND 2GND 3NC
4 TM 5 VDD (+5V) 6 /STB4
7/DTB3 8Din 9VH
10 VH
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
1VJCOM 2VJCOM 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
4VDD +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 signal Din and synchro-
nized 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.
16
CON6
1
6
CON4
CON2
4
1
3
2
PD1
R1 R2 R3 R4
4
1
3
2
PD2
1
2
CON5
1
40
CON1
16
CON7
19
CON3
19
R5
C21
C1
C3
J
MOTOR
R
MOTOR
HEAD UP
SENSOR
Connect
to the
ECR PWB
Non-paper detection sensor(J) Non-paper detection sensor(R)
Thermal head connection
Not
mounted
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
12
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.