Rev.D Product Overview Appendix D-53
TM-U675/U675P (with autocutter) Service Manual
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.
Table D-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 - -
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