Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 39)

PARTS LIST

COMPLETE

COUNTER

C1 -1 -AF,

400

-volt

Myfar

capacitor

11- 14 -6.3

-volt,

50 -nu l pilot lamp and lens as-

sembly, three green, one while (Southwest

Technical G -6.3 and W-6.3,

respectively

similar)

I1 -Phono jack

l2 -Photo jack and

nylon

insulated mounting kit

:111 -Comparator module

312-

Scaler

module

313-

M5 -DCU

module (sec text)

316-Gate module

:117

-/rower supply

module

R1-470 -ohm, !4 -watt

resistor

R2- 10,000

-alum,

watt resistor

R3- 100,000 -ohm, ;á .watt

resistor

SI-

Three- position, single

-pole

slide s-witch

S2- Four

-deck, four

-pole,

eight-position.

non-

shorting miniature selector switch.

Close span

first three

decks,

isolate fourth

with

spacers. (Southwest

Technical

SII'11151 or

equivalent)

S3- S.p.s.t. slide switch

54 S.p.s.t. normally

closed pushbutton

switch

Misc.-3"

x 5%" x 10" vinyl

-clad,

prepunched

case and support

assembly,

dialplate

1 %-

inch knob,

mounting

brackets for modules,

me-

chanical

hardware,

#16 wire for grounds,

#22

hookup wire, solder.

*Auodi,ced

dialplatc available from

Refill's

Photo

Finishing, 4627 N. 11/h St., Phoenix.

Arisona

55014; in

black

and silver

$3.00; red,

gold,

copper

$3.45, postpaid iu

US.1.

Note.- Complete

kit

of parts to

build counter

in-

cluding case but

not

dialplate is

available

from

Southwest

Technical

Products,

Bat'

16207,

Sou

Antonio, Texas 75216.

Order

165C, $12e.

plus

postage, 7 lb.

Plug

the counter

into

source

of 117

volt

60 -Hz

power

and place

selector

switch

S2 on

EVENTS

and switch

FOLLOW. One,

or possibly

two,

numerals

each decade

should

be illuminated.

Momentarily

depressing the

RESET

but-

ton

should

immediately produce

0000

reading.

Check

all

supply voltages, particularly

the

and

+3.6

volts,

to be sure

that

they are

within 0.1

volt of their

correct

values.

The -6 and

+12

-volt

supplies

should

be checked at

their respective

terminals

IC2 of the

Comparator

module

Ml.

Place

the range selector switch

the

0 -200

Hz position and observe

the

COUNTING

light

the front

panel. It

should cycle

on for

seconds

and

off

for

10 seconds.

Place

the

selector

switch

0 -2

kHz. The COUNTING

light

should

now

cycle

for 1 second

and

off for

second.

With the selector

switch on any

higher

range,

the light should

flash

for 0.1 second, once each second.

To check the operation of the

decimal -

point

indicators, place

the

range

selector

April, 1969

HOW IT WORKS

COMPLETE

COUNTER

The frequency to be counted is applied

the

sensitivity control,

which reduces the input

level

by 1 or 10 to the approximately

100 millivolts

required for normal operation.

The

signal is

then

sent

to the

Comparator

module

(.111)

where it i>

converted from

a sine Crave

to a square

wave of

the same frequency

with sharp rise and

fall

times.

Any

noise that might be present

in the input

also rejected

the

Comparator.

The Compara-

tor output is fed directly

to the range selector

switch 52 and

also

to a pair of decade

scalers that

provides divide -by -ten and divide -by

-one- hundred

outputs.

The latter are also

connected to the

range

selector switch.

The output of the Comparator

( f ) is

selected

for the

EVEN'T'S function, 0 -200 Hz, 0 -2

kHz,

0 -20

kHz

and

for the

external gate (EXT.

GATE) operation.

"I'he output from the

first

decade scaler

(1 /10) is used for the 0 -200

position,

and

the output of the second scaler

(I /100)

is used for

the

0 -2

MHz position.

The time

base starts

with a 60 -Hz reference

from the power supply.

This

signal is

filtered,

squared,

and divided

by six all in module M6)

obtain

the 0.1- second gating

reference. Two

divisions

by ten produce the

second

and

10-

second time references. "These time intervals, along

with

a positive

voltage for EVENT'S

and no

input for EXT. GATE are routed to the range

selector

switch.

hrom the

selector

switch, the tinte commands

go through the

HOLD-FOLLOW

switch which

permits a choice

automatically updating

the

reading or holding the

last reacting.

Both the measure

command and the selected

input frequency

go through the synchronizing

circuit in

the

Comparator

module.

The measure

command turns the

electronic

switch

on and off.

but

it does

it in

such a way that only whole

cy-

cles of

the input frequency are

counted. This

eliminates the one -digit bobble in the

counting.

The

time-base gated

frequency

then

goes

to the

counting and display circuits.

The

counter can be

reset

to zero

at any time

operation

the manual

RESET pushbutton,

but in

normal modes of

operation, the

counters

are automatically

reset

just before

a new count

begins.

The operation of the counter is fully

automatic.

The

available

measure

commands

are

10 -s

measure

and

10 -s display for

0- 200

-Hz

opera-

tion;

1 -s measure

and

I -s

display for

0 -2 -kHz

operation; and 0.1

-s

measure

and

0.9 -s

display

for

the

other

ranges.

keep

the

display

longer, Rip

switch

S3 to HOLD.

switch

the 0 -2

MHz position

and note

that

the

left decimal

point

indicator

illuminated.

For

other switch

positions,

lights

should

be on

follows:

0 -200

kHz,

right;

0 -20

kHz,

center;

0 -2 kHz,

left; 0 -200

Hz,

right.

With

the

counter

still

energized,

set

the

-HOLD switch

to FOLLOW,

the

range

switch to 0 -2

kHz,

and the

SENS.

(sensitivity)

switch

to .1. Insert

test

lead

in the

INPUT jack and

touch the

other

end of the

test

lead. Note that

the

counter

starts

operating erratically

only

when

the COUNTING

light is

lit.

The

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 115 116

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