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CHAPTER 4
CIRCUIT DESCRIPTION AND MECHANISM BLOCK DESCRIPTION
4-1. POWER SUPPLY CIRCUIT
4-1-1. Voltages and Thoir Usages
vwtage
Uwge
t| Motor dnve
2)
Electromagnetic clutch drive
3) Solenoid drive
4SV |Vcc|
1) Logic circuit drive
2)
Display lamp drivo
3) Chinese character ROM board (optional) drive
4) Sensor drive
1
) Priming head drive
4-2. RESETTING CIRCUIT
When th« power switch is turned on it generates reset signal. It
operates equivalent to the above, evsn it VCC becomes lest than
3V. The rosot signal resets MPU.
|1|
V# denotes AC adapter voltage or battery voltage (Whan
rating load 1.2A consumption)
The reaming c*euil is controlled by Zener voltage of D5. R3b
and C20 are time constant circuits which determino the reset
AC input voltage
AC Adapter output voltage
Rating voltage +1036
lea. then +0.9V
Ova. »6.6V
Rating voltage —10%
Over +4.7V
The battaiy voltago dilfers depending upon the scattering Ot
batteries to be used and hours used.
Possiblo usable voltage 0« the bettery is over +4.5V. (When
ASCII printin)
{2)
V* differ* depending upon ihe rank ol printing head
resistance value
Sat VR1 to masimum density by the density admitting knob
and adjust the voltage ns follows;
Printing head rank
Vr setting voltoQe
A
7 2 ± 0.1V
B
6.9 ± 0.1V
c
6
6 ± 0.1V
Note:
The printing head rank is shown in FPC
4-1
PRNT24(AE)
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