Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 38)

FIG

S2D

1I7VAC

nJONLY

LINE

3.6

A/I0

B/10

-0

D GATE

-0

D/10

-0

C/2

SCALER

0 0 N

ZU' ?

M7 POWER

SUPPLY

IAA-

02 N

A' -4-0

CASE

RST

COMPARATOR

CARRY

COUNT

UNITS

DCU

CARRY

COUNT

TENS

DCU

CARRY

ÇNT

HUNDREDS

DCU

RST

.1 SEC

SEC

COUNT

GATE

MODULE

I I,

COUNTING

RESET

N.C.

J2 Iÿ1

INPUT

INSULATE SI

FROM CASE

A -OFF E-

0 -20kHz

B-

EVENTS

F-

O-200kHz

C- 0 -200Hz G-0 -2 MHz

D-

0 -2kHz

H -EXT GATE

10K

10 R3

IOOK

GATE

HOLD

47011

CASE

LEFT CENTER

RIGHT

DECIMAL

POINTS

G H

-E

S2B

Fig.

17.

Interconnections for complete

frequency counter. Signal

input

jack

insulated

from chassis to prevent

internal noise

interference

with

the

input

signal.

supply

ground

buss.

The

main selector switch

(S2) has

four decks, one of which

is isolated from

the other three

by spacers.

The isolated

deck controls the

117

-volt, 60 -Hz

power,

while

the

other three (starting

from the

front)

select

the frequency,

the timing,

and

the decimal

point.

Preliminary

Checkout and

Operation.

The

frequency

counter

requires

no cal-

ibration

and

has no internal adjustments.

It is

only as accurate

as the

117 -volt a.c.

power

-line

stability

and display

resolu-

tion

permit it to be.

The following

tests

can

be performed to

check the

general

assembly

for

proper

operation.

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Epson L90P - TM Two-color Thermal Line Printer Manual de usuario Pagina 38

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