Appendix D-54
Product Overview
Rev. A
Confidential
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:
Reset also can be performed by sending the reset signal from the host interface.
GACS
93
GA CS
CS_GA
IN
Not
selected
GA
selected
PH5/STB1
94
Thermal head strobe-1
TH_STB1
OUT
Not
selected
Block 1
selected
PH4/STB2
95
Thermal head strobe-2
TH_STB2
OUT
Not
selected
Block 2
selected
PH3/DI1
96
Thermal head block-1 DATA
TH_D1
OUT
Printed
Not
printed
PH2/DI2
97
Thermal head block-2 DATA
TH_D2
OUT
Printed
Not
printed
VSS7
98
Fixed power source
GND
PH1/SCLK
99
Thermal head SCLK
H_SCLK
OUT
Data
input at
leading
edge
PH0/LAT
100
Thermal head DATA latch
TH_LAT
OUT
Retained
Latched
TableD-9 Reset IC specifications
Item
Min.
Typ.
Max.
Detection Voltage (V)
4.0
4.2
4.5
Hysteresis Voltage (mV)
30
50
100
Delay Time (ms)
30
50
75
M/R Terminal "H" Voltage (V)
2.0
-
-
TableD-8 GA terminals and functions
Terminal
Name
Pin
No.
Description
Circuit Signal
Name
Spec.
Meaning
of H
Meaning
of L
Summary of Contents for TM-H6000
Page 1: ...Confidential Service manual TM H6000 H6000P English 401040800 Issued Date 199 Issued by ...
Page 29: ...1 20 Troubleshooting Rev A Confidential ...
Page 69: ...Disassembly and Assembly 2 40 Rev A Confidential ...
Page 81: ...3 12 Adjusting Rev A Confidential ...
Page 83: ...Appendix A 2 Service Tools and Lubricants Rev A Confidential ...
Page 87: ...Appendix B 4 Maintenance Rev A Confidential ...
Page 225: ...I 10 Printer Handling Rev A Confidential ...
Page 227: ...Appendix J 2 Screw Types Rev A Confidential ...
Page 229: ...K 2 Parts Layout Rev A Confidential Main Circuit Board Unit solder side memory board ...