Elenco Electronics M-1005K Assembly And Instruction Manual

DIGITAL MULTIMETER KIT

MODEL M-1005K

Assembly and Instruction Manual

Elenco Electronics, Inc.

Copyright © 1996 Elenco Electronics, Inc. REV-J Revised 2000 753042

PARTS LIST

Contact Elenco Electronics (address/phone/e-mail is at the back of this manual) if any parts are missing or
damaged. DO NOT contact your place of purchase as they will not be able to help you.

RESISTORS

QTY SYMBOL VALUE COLOR CODE PART #

1 R0 .01Ω Shunt Wire 100160
1 R8 .99Ω .5% 1/4W black-white-white-silver-green 109950
1R7 9Ω .5% 1/4W white-black-black-silver-green 119000
1R9 10Ω 5% 1/4W brown-black-black-gold 121000
2 R10, R* 100Ω 5% 1/4W brown-black-brown-gold 131000
1 R6 100Ω .5% 1/4W brown-black-black-black-green 131050
1 R5 900Ω .5% 1/4W white-black-black-black-green 139050
1 R13 900Ω 1% 1/4W white-black-black-black-brown 139030
1 R18 2kΩ PTC1 142069
1 R11 9kΩ 1% 1/4W white-black-black-brown-brown 149030
1R4 9kΩ .5% 1/4W white-black-black-brown-green 149050
1 R12 20kΩ 1% 1/4W red-black-black-red-brown 152030
1 R3 90kΩ .5% 1/4W white-black-black-red-green 159050
2 R16, R26 100kΩ 5% 1/4W brown-black-yellow-gold 161000
3 R2A, R2B, R2C 117kΩ 1% 1/4W brown-brown-violet-orange-brown 161130
1 R15 180kΩ 5% 1/4W brown-gray-yellow-gold 161800
2 R21, R22 220kΩ 5% 1/4W red-red-yellow-gold 162200
2 R1A, R1B 274kΩ 1% 1/4W red-violet-yellow-orange-brown 162730
1 R14 300kΩ 5% 1/4W orange-black-yellow-gold 163000
1 R25 470kΩ 5% 1/4W yellow-violet-yellow-gold 164700
1 R23 510kΩ 5% 1/4W green-brown-yellow-gold 165100
1 R24 820kΩ 5% 1/4W gray-red-yellow-gold 168200
1 R17 1.2MΩ 5% 1/4W brown-red-green-gold 171200
2 R19, R20 2.2MΩ 5% 1/4W red-red-green-gold 172200
1 VR1 200Ω (201) potentiometer 191310

Note: Your kit may contain a resistor with a better tolerance.

CAPACITORS

QTY SYMBOL VALUE DESCRIPTION PART #

1 C1 100pF (101) Disc 221017
4 C2, C3, C4, C6 .1µF (104) Mylar Small 251018
1C5 .1µF (104/100n) Mylar Large 251019

SEMICONDUCTORS

QTY SYMBOL VALUE DESCRIPTION PART #

1 D1 1N4007 Diode 314007
1 IC1 7106 IC 40-Pin 337106
1 Q1 9013 Transistor 339013
1 Q2 9014 Transistor 339014

MISCELLANEOUS

QTY DESCRIPTION PART #

2 Zebra 500003H
1 PC Board 516100H
1 Fuse .25A 250V 533003
1 Batter y 9V 590009
1 Batter y Snap 590098
1 LCD 621016H
1 Selector Knob 622100H
1 Case Top (Black) 623110H
1 Case Bottom (Black) 623208H
1 LCD Cover 621040H
1 LCD Frame 629008H
2 Screw 2.3mm x 6mm 643439E
2 Screw 2.3mm x 10mm 643447E
2 Fuse Clip 663100E

QTY DESCRIPTION PART #

1 Socket Transistor 664007
1 Socket 40-pin 664040
3 Input Socket 664101H
2 Ball Bear ing 666400E
6 Slide Contact 680013E
2 Spr ing 1/4” (Selector Knob) 680014E
1 Spr ing 1/2” (Shield) 680015E
1 Label Shield 723007H
1 Label Front 724007H
1 Manual Assembly 753042
1 Grease 790004
1 Solder Tube 9ST4
1 Test Lead Set RWTL1000B

-1-

-2-

IDENTIFYING RESISTOR VALUES

Use the following information as a guide in properly identifying the value of resistors.

BAND 1

1st Digit

Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

BAND 2

2nd Digit

Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

Multiplier

Color Multiplier
Black 1
Brown 10
Red 100
Orange 1,000
Yellow 10,000
Green 100,000
Blue 1,000,000
Silver 0.01
Gold 0.1

Resistance

Tolerance

Color Tolerance
Silver +

10%
Gold +5%
Brown +

1%

Red +

2%
Orange +3%
Green +

.5%

Blue +

.25%

Violet +

.1%

5 Bands

1 2

Multiplier

Tolerance

IDENTIFYING CAPACITOR VALUES

Capacitors will be identified by their capacitance value in pF (picofarads) or µF (microfarads). Most capacitors
will have their actual value printed on them. Some capacitors may have their value printed in the following
manner.

Second Digit

First Digit

Multiplier
Tolerance

The above value is 10 x 1,000 = 10,000pF or .01µF
The letter K indicates a tolerance of +

10%

The letter J indicates a tolerance of +

5%

For the No.01234589
Multiply By 1 10 100 1k 10k 100k .01 0.1

Multiplier

Note: The letter “R” may be used at times to
signify a decimal point; as in 3R3 = 3.3

Resistors

Springs

PARTS IDENTIFICATION

Integrated Circuit

and Socket

Potentiometer

Ball

Bearing

Selector Knob

Battery Snap

Fuse

Clip

Slide

Contact

Transistor

Test Socket

Fuse

Input Socket

BAND 3

(If Used)

Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

3

4 Bands

1

2

Multiplier

Tolerance

Transistor

IC

Socket

Zebras

LCD

Cover

Frame

Diode

Shunt Wire

PTC

LCD Assembly

Zebras/LCD/Frame/Cover

Capacitors

Discap

Mylar

C5

-3-

CONSTRUCTION

Introduction

Assembly of your M-1005K Digital Multimeter Kit will prove to be an exciting project and give you much satisfaction and personal
achievement. If you have experience in soldering and wiring techniques, then you should have no problem with the assembly of this kit.
Care must be given to identifying the proper components and in good soldering habits. Above all, take your time and follow these easy
step-by-step instructions. Remember, “An ounce of prevention is worth a pound of cure”. Avoid making mistakes and no problems will
occur.

CAUTION: WEAR SAFETY GLASSES WHEN ASSEMBLING THIS KIT.
Assemble Components

In all of the following assembly steps , the components must be installed on the top side of the PC board unless otherwise indic ated. The
top legend shows where each component goes. The leads pass through the corresponding holes and the board is turned to solder the
component leads on the foil side. Solder immediately unless the pad is adjacent to another hole which will interfere with the placement
of the other component. Cut excessive leads with a diagonal cutter. Then, place a check mark in the box provided next to each step to
indicate that the step is completed. Be sure to save the extra leads for use as jumper wires if needed.

Soldering

The most important factor in assembling your digital multimeter is good soldering techniques. Using the proper soldering iron is of prime
importance. A small pencil type soldering iron of 25 - 40 watts is recommended. The tip of the iron must be kept clean at all times
and well tinned. Many areas on the PC board are close together and care must be given not to form solder shorts. Size and care of
the tip will eliminate problems.

For a good soldering job, the areas being soldered must be heated sufficiently so that the solder flows freely. Apply the solder
simultaneously to the component lead and the component pad on the PC board so that good solder flow will occur. Be sure that the
lead extends through the solder smoothly indicating a good solder joint. Use only rosin core solder of 60/40 alloy.
DO NOT USE ACID CORE SOLDER! Do not blob the solder over the lead because this can result in a cold solder joint.

1. Solder all components from
the copper foil side only.
Push the soldering iron tip
against both the lead and the
circuit board foil.

Component Lead

Soldering Iron

Circuit Board

Foil

2. First apply a small amount of
solder to the iron tip. This
allows the heat to leave the
iron and onto the foil.
Immediately apply solder to
the opposite side of the
connection, away from the
iron. Allow the heated
component and the circuit
foil to melt the solder.

Solder

Soldering Iron

Foil

Example 1

Poor solder connections occur
when the lead is not heated
sufficiently. The solder will not
flow onto the lead as shown.To
correct. reheat the connection
and, if necessary , apply a small
amount of additional solder to
obtain a good connection.

Solder does not flow onto the
lead. A hard rosin bead
surrounds and insulates the
connection.

Poor solder
connection

Mount Part

Soldering iron
positioned incorrectly.

Example 2

A solder bridge occurs when
solder runs between circuit
paths and creates a short
circuit. This is usually caused
by using too much solder. To
correct this, simply drag your
soldering iron across the
solder bridge as shown.

4. Here is what a good solder
connection looks like. Cut
off excess leads.

3. Allow the solder to flow
around the connection.
Then, remove the solder and
the iron and let the
connection cool. The solder
should have flowed smoothly
and not lump around the wire
lead.

Solder

Soldering Iron

Foil

Bend Leads to Hold Part Solder and Cut Off Leads

Foil Side

Rx - 100Ω 5% 1/4W Resistor

(brown-black-brown-gold)

-4-

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown in Figure 4-1. After solder ing each part, mark a check in the
box provided. Be sure that solder has not bridged to an adjacent pad.

Figure A Figure B

Stand resistor on end as
shown with the body
inside the white circle

C3 - .1µF (104) Mylar Small
C2 - .1µF (104) Mylar Small
VR1 - 200Ω (201) P otentiometer

(see Figure A)

R13 - 900Ω 1% 1/4W Resistor

(white-black-black-black-brown)

(see Figure B)

R15 - 180kΩ 5% 1/4W Resistor

(brown-gray-yellow-gold)

(see Figure B)
C1 - 100pF (101) Discap
R26 - 100kΩ 5% 1/4W Resistor

(brown-black-yellow-gold)

(see Figure B)
R16 - 100kΩ 5% 1/4W Resistor

(brown-black-yellow-gold)

(see Figure B)
C6 - .1µF (104) Mylar Small
R8 - .99Ω .5% 1/4W Resistor

(black-white-white-silver-green)

(Standard Location)

R* - 100Ω 5% 1/4W Resistor

(brown-black-brown-gold)

(see Figure B)
R21 - 220kΩ 5% 1/4W Resistor

(red-red-yellow-gold)

(see Figure B)

Figure C

Mount the transistor with
the flat side in the same
direction marked on the
PC board.

Mount the potentiometer to the PC board
as shown.

1/8”

C4 - .1µF (104) Mylar Small
R14 - 300kΩ 5% 1/4W Resistor

(orange-black-yellow-gold)

(see Figure B)
C5 - .1µF (104) Mylar Large
R23 - 510kΩ 5% 1/4W Resistor

(green-brown-yellow-gold)

(see Figure B)
Q2 - 9014 Transistor

(see Figure C)
R25 - 470kΩ 5% 1/4W Resistor

(yellow-violet-yellow-gold)

(see Figure B)
R20 - 2.2MΩ 5% 1/4W Resistor

(red-red-green-gold)

(see Figure B)
R24 - 820kΩ 5% 1/4W Resistor

(gray-red-yellow-gold)

(see Figure B)
R19 - 2.2MΩ 5% 1/4W Resistor

(red-red-green-gold)

(see Figure B)
R9 - 10Ω 5% 1/4W Resistor

(brown-black-black-gold)

(see Figure B)
R18 - 2kΩ PTC1
D1 - 1N4007 Diode

(see Figure E)
R22 - 220kΩ 5% 1/4W Resistor

(red-red-yellow-gold)

(see Figure B)

White Circle

-5-

ASSEMBLY INSTRUCTIONS

Identify and install the following parts as shown in Figure 4-2. After solder ing each part, mark a check in the
box provided. Be sure that solder has not bridged to an adjacent pad.

Figure E

Stand diode on end. Mount
with band as shown on the top
legend.

Figure D

Align the socket notch (if any)
with the notch marked on the
PC board. Solder the socket to
the PC board. Insert the IC
into the socket with the notch
as shown below. Note: If the

IC is already inserted into
the socket, do not attempt to
pull it out, as this will
damage the IC and socket.
Instead, solder the socket to
the PC board with the IC in it.

Figure 4-2

Notch

R4 - 9kΩ .5% 1/4W Resistor

(white-black-black-brown-green)

(see Figure B)
R3 - 90kΩ .5% 1/4W Resistor

(white-black-black-red-green)

(see Figure B)
R2A - 117kΩ 1% 1/4W Resistor

R2B - 117kΩ 1% 1/4W Resistor
R2C - 117kΩ 1% 1/4W Resistor

(brown-brown-violet-orange-brown)

(see Figure B)
R1A - 274kΩ 1% 1/4W Resistor

R1B - 274kΩ 1% 1/4W Resistor

(red-violet-yellow-orange-brown)

(see Figure B)

IC - Socket 40-pin
IC - 7106 (see Figure D)

R11 - 9kΩ 1% 1/4W Resistor

(white-black-black-brown-brown)

(see Figure B)

R12 - 20kΩ 1% 1/4W Resistor

(red-black-black-red-brown)

(see Figure B)

R17 - 1.2MΩ 5% 1/4W Resistor

(brown-red-green-gold)

(see Figure B)

Q1 - 9013 Transistor

(see Figure C)

R6 - 100Ω .5% 1/4W Resistor

(brown-black-black-black-green)

(see Figure B)

R5 - 900Ω .5% 1/4W Resistor

(white-black-black-black-green)

(see Figure B)

R7 - 9Ω .5% 1/4W Resistor

(white-black-black-silver-green)

(see Figure B)

R10 - 100Ω 5% 1/4W Resistor

(brown-black-brown-gold)

(see Figure B)

Band

* Note:

• R1A and R1B are not marked
on the board.

• R2A, R2B, and R2C are not
marked on the board.