Epson TM-H6000 Service Manual page 145

Confidential
TableD-8 GA terminals and functions
Terminal Pin
Name No.
GACS 93
PH5/STB1 94
PH4/STB2 95
PH3/DI1 96
PH2/DI2 97
VSS7 98
PH1/SCLK 99
PH0/LAT 100
Reset Circuit
Stable operation of the CPU and GA requires, a certain reset period immediately after power up.
All operations return to their initial status after the reset operation. The reset IC (U1) on this
printer monitors the logic power source (VCC, Standard output: +5V), and sets the reset signal
to LOW when the VCC is 4.2V or lower. The reset signal is restored from LOW to HIGH 50 ms
after the VCC exceeds 4.2V. The CPU and GA operate normally after reset.
The main specifications of the reset IC are shown below:
TableD-9 Reset IC specifications
Item
Detection Voltage (V)
Hysteresis Voltage (mV)
Delay Time (ms)
M/R Terminal "H" Voltage (V)
Reset also can be performed by sending the reset signal from the host interface.
Appendix D-54 Product Overview
Description
GA CS
Thermal head strobe-1
Thermal head strobe-2
Thermal head block-1 DATA
Thermal head block-2 DATA
Fixed power source
Thermal head SCLK
Thermal head DATA latch
Min.
4.0
30
30
2.0
Circuit Signal
Name
CS_GA
TH_STB1
TH_STB2
TH_D1
TH_D2
GND
H_SCLK
TH_LAT
Typ. Max.
4.2 4.5
50 100
50 75
- -
Meaning
Spec. of H
IN Not
selected
OUT Not
selected
OUT Not
selected
OUT Printed
OUT Printed
OUT Data
input at
leading
edge
OUT Retained
Meaning
of L
GA
selected
Block 1
selected
Block 2
selected
Not
printed
Not
printed
Latched
Rev. A