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4-7. SWITCH AND SENSOR CIRCUIT
4-10. FRAME BLOCK
I
The IF and Bf switches and CluneM character ROM board
input/non-input is rood by solacing IC14.
Tl>e DIP switch input is read by selecting ICb.
The On-line switch is Input to MPU P55.
The carriage detection switch is input to MPU P56. The PE
sensor it driven by making MPU P08 to low ond is detected at
Pt)4.
The On-line LED is lit by making MPU P21 to low.
Note:
The PE senioc is e reflection type photo soneoi and by
inserting the recording paper, the reiicction o* light is
generated and makes P84 to high.
As sensing is not possible egorost recording paper
which has a high transparency degree such as OHP film,
etc., n is re«i»t«0 to invalidate the PE sensor by turning
on DIP switch 2 when using this type of recording paper.
4-8. POWER/LOW BATTERY LIGHTING
CIRCUIT
The power LED is lit by turning on the power switch. Moreover,
when Vo becomes lower than 4.56V ±0.25V. power LED blinks
as a battery replacement request sign.
When the Vo becomes lower than the above mentioned voltage,
the output (Pm 14) of ICI 5(4/4) becomes high and the output
(Pin 13) of IC15(3/4| become* low, ond the gate oI IC14 is
turned on.
IC1
is a non-stable multivibrator which outputs rectangular
wove, nnd blinks the powor LED (Cycle 2 Hz).
4-9. MECHANISM BLOCK OUTLINE
DESCRIPTION
This printer .s composed roughly of 6 'unction tNocks. namely,
frame block drivo block, printing, column raising, column raising
return
and
tape
winding
structure
block,
paper
(ceding
mechanism block, hasd pressure contact release mechanism
block and carriage detection signal generating block, and the
drive of the mam mechanism is composed <* 1 stepping motor,
t electromagnetic clutch and 1 solenoid.
Tho frame block is comprised of :he frame, shads and pulley, end
the respective intenor and exterior structures are arranged on ih*
frame.
4-11. DRIVE BLOCK
Distributee power of tho stopping motor to pulley gear and paper
loading mechanism block through the idle goat.
4-12. PRINTING. COLUMN RAISING.
COLUMN RAISING RETURN AND
TAPE WINDING MECHANISM BLOCK
the printing, column raising, column raising return and rape
winding structure is comprised of the thermal heed unit winding
bobbin unit for tope winding and gears for transmitting rotation
to them, wire unit lor Uenamttmg powor (or column roising and
column raising return, and carriage guide plate and carriage
shall etc to guide the movements of column raising end column
raising return. The ptaton unit which receives the pressure of the
carriage unit and thermal head and tho prossuro contact spring
which generates that pressure constitute the morn element
PRN-T24(AE)
4-7
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