Sam4s ER-390 SERIES Service Manual page 43

7-5 Thermal Printer Circuit
The operating method of the thermal printer is similar to the VFD operating method. First, the CPU send a Serial Clock
and Serial Data 384Bits(48 Bytes) to the Thermal Printer. The Serial Data are stored to a Shift Register in the Thermal
Printer. Second, the CPU send a Latch Signal to the Thermal Printer. Then, the Serial Data are stored to the Latch Register.
After that, the CPU send a Strobe Signal to the Thermal Printer. Then, the Printer outputs the Serial Data. The Strobe
Signals (STB1,STB2,STB3) are shorted each other on Main PBA (Same STB4,STB5,STB6).
manage the Printer Dot.
STB No. DOT No.
STB1 1 ~ 64
STB2 65 ~ 128
STB3 129 ~ 192
STB4 193 ~ 256
STB5 257 ~ 320
STB6 321 ~ 384
TPH_STB1
CPU
M30800SFP
TPH_STB2
TPH_LATCH
TPH_DATA
TPH_CLK
SAM4S ER-390 SERIES
DOTs/STB
64
The STB1,STB2 and STB3 are shorted each other on Main PBA.
64
(192 Dots)
64
64
The STB4,STB5 and STB6 are shorted each other on Main PBA.
64
(192 Dots)
64
Table 7-2 Printer Head Strobe Processing
Figure 7-9 Thermal Printer Block Diagram
7 Special Circuit Descriptions
ER-380 Strobe Processing
Printer Line
Strobe Circuit
Latch Register
Shift Register
THERMAL PRINTER
Each Strobe Signal
7-7