Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 50)

OFF

H 1}-

*IN5297 J3(

PE.

OFF

EXT. J4 P2

len

XI SIB

_L*

I- 2

Fig.

1. Two things

make

this ohmmeter

different

56K

x100

from

others.

First

it requires

zero control;

second,

only

low

current can

flow,

even with

short circuit.

Choice

determines

the current.

0 -I m

JIO+ -óJ2

EXT

METER

*SEE TEXT

J5 P3

PARTS

LIST

B1-30-volt battery

(Evercady 413

or similar)

D1-

1á'5297 constant-

current

diode

(Allied

Elec-

tronics

#49F261:ß'5297

-MOT- $4.45. Sec How

Works

for

diode

selection.)

-J6- Banana jacks (E.F. Johnson

108

series)

M1- 0 -1 -mA meter

(Simpson

Model

or simi-

lar)

-P4

-Plugs

to mate

with banana jacks

-18 -ohm,

1 -watt,

wire

-wound

1`c

resistor

R3 5000

-ohm, 1 -watt, wire-wound

1c,; resistor

-Two -pole, four-

position

rotary

switch

Misc.Metal

enclosure,

battery holder (Keystone

183 or

similar),

four

2 -foot

heavy

-duty

test

leads, 2

alligator

clips, knobs.

tions

Si, be sure that the

correct ter-

minals are used on each section.

Also

sure that

Dl is

wired

in correctly. If you

use

the Motorola

diode

called for

the

parts

list,

the black band should

be to-

ward J3. Unlike

a conventional

diode,

the constant

-current

diode is installed

with

the

wrong polarity,

will conduct

heavily

and ruin

both itself

and the me-

ter.

The circuit

and

assembly

are

very

simple.

The bulk

of the components

are mounted

the

front

panel with

only the battery

chassis

bottom.

POPULAR ELECTRONICS

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