Service manual

3) Block diagram
TPRC1 BLOCK DIAGRAM
Fig. 2-8
4) Pin description
Pin
No.
Signal
name
In/Out Function
1 GND — GND
2 GND — GND
3
ST1 O Head drive strobe signal 1
4 GND — GND
5
ST2 O Head drive strobe signal 2
6
ST3 O Head drive strobe signal 3
7
ST4 O Head drive strobe signal 4
8
ST5 O NU
9
ST6 O NU
10
LATCH O Head latch signal
11 GND — GND
12 GND — GND
13 GND — GND
14 SI I Data return line, thermalhead -- TPRC1
15 SO O Send data from TPRC1 to thermalhead
Data from PB-RAM or zero data are
outputted at the falling of CLOCK signal.
16
16 CLOCK O Thermalhead CLOCK signal
SO is outputted at the edge of I Ä O,
and is taken at the edge of o Ä I.
17 INHDEC I GND
Pin
No.
Signal
name
In/Out Function
18
CSEN I GND
19
TEST2 I +5V internal counter timer test pin
20 Vcc — +5V
21 Vcc — +5V
22 Vcc — +5V
23 Vcc — +5V
24
TEST1 I +5V internal counter timer test pin
25 D0 I/O Data bus 0: Internal register, print buffer
data IO
26 D1 I/O Data bus 1: Internal register, print buffer
data IO
27 D2 I/O Data bus 2: Internal register, print buffer
data IO
28 D3 I/O DAta bus 3: Internal register, print buffer
data IO
29 D4 I/O Data bus 4: Internal register, print buffer
data IO
30 GND — GND
31 GND — GND
32 GND — GND
33 D5 I/O Data bus 5: Internal register, print buffer
data IO
MOTOR
CONTROL
HEAD
I/F
MISC.
TEST
CIRCUIT
CUTTER
CONTROL
PB I/F UNIT
SYSTEM
I/F
PORT
PDCTLU
DECODEK UNIT
HEAD CONTROL
TIMER UNIT
MOTOR CONTROL
TIMER UNIT
CUTTER CONTROL
TIMER UNIT
CLOCK
GEN.
INTERRUPT CIRCUIT
HOST BUS I/F UNIT
INHBEC
CSEN
CGS
RD,WR
A0~23
D0~7
WO
WI
INT
INTI
PHAI
(
Φ)
BD0~7
BA0~15
BRAS,BRAS
BRD,BWR
RES
POF,INH
POP,PHUP,PFP,PCRES
PTRM,PTJM
CLOCK,SO,ST1~5,HCO
SI
EBAK,EPEQ
EBRK,EACK
RVPON,JVPON,
RAS,RBS,RCS,RDS,
JAS,JBD,JCS,JDS
TEST1,TEST2
CTAO,CTBO
4 – 11