Elenco Electronics FUN-755 User Manual

Spring

Lever

Cradle Assembly

Brackets

Screw Used

(shown actual size)

2.6 x 7mm

X2

Plate

Big Washers

Screw Used

(shown actual size)

2.6 x 6mm Screws
with Washer

2.6 x 6mm with washer

X2

Input Modular Jack

Buzzer Pad

Remove

Backings

Modular Jack

PC Board

Buzzer

Screw Used

(shown actual size)

2.6 x 6mm Screws

2.6 x 6mm

X3

Index Label Shield

Index Label

Screws Used

(shown actual size)

Hook Switch

NOTE: Be

sure that the

Lever is above the

Hook Switch as

shown.

3 x 7mm Screws

3 x 7mm

X4

Lever

Decorative Piece

Push Button Panel

NOTE: Push

the Push Button

Panel up and

snap it into

position.

2.6 x 10mm Screws

Screws Used

(shown actual size)

2.6 x 10mm

X2

Handset Assembly

Speaker Pad

Remove
Backing

Speaker

Speaker Pad

Remove
Backing

Mute Button

Keypad Contact

Number

Button

Flash Button

Redial Button

3

21

6

54

9

87

#

0

*

Back View

Use this diagram as a
guide when installing
the number buttons.

NOTE: Make

sure that the angle

on the Flash, Redial,

and Mute buttons are

in the same

direction shown.

Keypad PC Board

Rubber Microphone Cup

Microphone

Screw Used

(shown actual size)

2.6 x 6mm Screws

2.6 x 6mm Screws

2.6 x 6mm

X6

2

5

3

4

Modular Jack

Wiring/Tubing Assembly

NOTE:

Follow

these steps for

wiring the speaker

wires to the PC

board wires.

1

Screw Used

(shown actual size)

2.6 x 14mm Screws

Cut Tubing

Slide
Tubing
onto wire.

Twist
wires
together.

Slide
Tubing over
the twisted
wires.

2.6 x 14mm

X2

Wiring/Tubing Assembly

Coiled Cord

NOTE: When

snapping the receiver

cover on, star t from the

back.

It may take a couple

attempts to attach

the two pieces.

Phone Number Shield

Phone Number

Label

2.6 x 14mm
Screws

Before the

Final

Assembly

Refer to Page 6 and perform the
Transmit/Receive & Dial Tests.

Screw Used

(shown actual size)

2.6 x 14mm

X2

Final Assembly

Foam Feet

Bottom View

Remove
Backing

THIS UNIT COMPLIES WITH

PART 68 FCC RULES FCC NO.

GXA1CHN-74412-TE-E REN NO. 1.3B

USE STRANDARD JACK USOC RJ11C

FCC Label

Line Cord

Copyright © 2001 Elenco Electronics, Inc. All Rights Reserved. • 150 W.Carpenter Ave. • Wheeling, IL 60090 • [phone] Fax: [phone] • e-mail: [e-mail] • Web Site: http://www.elenco.com

You have now completed the assembly of the FUN-755 Telephone Kit. Refer to HOW TO USE IT on
the other side. If the phone does not work, refer to TROUBLESHOOTING.

There are many other projects: Cassette Player, RC Car, Talking Clocks, Electronic
Keyboard, etc. Ask your store about these projects or call at [phone].

2.6 x 7mm Screws

Contact Elenco Electronics if you have any problems. Actual colors may vary from those shown here.

ASSEMBLY INSTRUCTIONS

Side View

Top View

Hook

Switch

Lever

Bend LED Up

1/8”

Use scissors
to cut off 1/8”.

FUN-755 FUN-755

Before Y ou

START .. .

Refer to Page 5 and
perform the Ring
Test.

Long Part of Spring

Short Part of Spring

NOTE: Remove any
burrs on the buttons

before installing them into

the Push Button Panel.

2

Remove Burrs

NOTE: This

may take a
couple attempts
to attach the two

pieces.

The FUN-755 is a push-button pulse/tone dial electronic telephone kit that you put
together.The kit is mechanically and electronically assembled by the user with no
soldering required.

In addition to the experience of building the unit, there is also an overview of how
to use it, an electronic road map showing the electrical circuits, and a
troubleshooting section in case of problems.

The Model FUN-755 is equipped with the following features:

1. Tone/pulse switch

2. Mute button

3. Automatic redial last number

4. Ringer ON/OFF switch

5. Neon bulbs flash as telephone is ringing

6. Lighted dial key pad

7. Flash button

8. Desk top or wall mounting
Recommended for ages 8 and up. It takes about 3 hours to build.

YOU WILL NEED:

• 9V battery (if you want to test while building).

• Scissors, sharp knife, or a pair of flush cutting diagonal pliers

• Screwdriver phillips medium size

TELEPHONE KIT

Manufactured by

Elenco Electronics, Inc.

150 W.Carpenter Avenue

Wheeling, IL 60090

Copyright © 2001 Elenco Electronics, Inc.

WHATIT IS

ELECTRONIC ROAD MAP

FUN-755

2

753063

WARNING:

CHOKING HAZARD - Small Parts.

Not for children under 5 years.

Contains functional sharp edges

and points.

!

!

TRANSMIT - RECEIVE TEST

Connect the telephone to the test cable with the 9V battery connected to it using telephone
line cable.

1. Put your ear to the speaker and depress and release the hook switch.

You do not hear the click,then:

a. Check the right assembly stand for test.
b.

Check assembly cradle set. Is the lever located over the hook switch? (see Step 4 on
the other side).

c. Check that the wires have a good connection from PC board to the speaker.

2. Put your ear to the speaker and gently tap or scratch the case where the microphone
is located. You should hear the tapping on the speaker.

3. As you are tapping, push and hold the mute button down. You should not hear the
tapping sound.

The 2nd and 3rd test fail, then:

a. Check the microphone and wires.
b. Check if the mute button is installed correctly.

DIAL TEST

Continue using the test cable for this test.

1. Switch the P-T (Pulse/Tone) Switch to P-position. Depress and release the hook switch

and push the "1" button. You should hear a click and see the green LEDs blink. Push
the "2" button, you should hear two clicks and see the green LEDs blink. Press each of
the remaining numbered buttons from "3" to "0" to verify that each is operational. Press
the yellow "FLASH" button. You should see the green LEDs blink.

Dial a telephone number. Depress and release the hook switch and push the "REDIAL"
button. The number should redial and the green LEDs should blink.

Above tests fail, then:

a. Check that the buttons are installed correctly.
b. Check the assembly of the push-button panel, yellow buttons ("REDIAL" and

"FLASH"), keypad contact and the PC boards.

c. Check the P-T switch

2. Switch the P-T switch to T- position. Depress and release the hook switch and push

button "1". You should hear a click. Push button "2". You should hear again a click.
Press each of the remaining numbered buttons from "1" to "0" and buttons "

*

" and "#"

to verify that each is operational.

Test fails, then:

a. Check the P-T switch

Remove the test cable from the telephone line. Return to Step 10 of the Assembly

Instructions.

TRANSMIT - RECEIVE & DIALER TESTS

HOW TO USE IT

Plug the telephone line into a modular jack connected to a telephone line.

1. Tone/Pulse Dialing - If your home is equipped with touch tone dialing service,
set the tone/pulse switch to tone position. If your home is equipped with rotary
dialing service, set the tone/pulse switch to pulse position.

2. Ringer ON/OFF Switch - The ringer can be turned OFF by setting the
RINGER ON/OFF SWITCH TO OFF.

3. To Place and Receive Calls - Lift handset to place or receive calls. Upon
completion, return handset to cradle, or press the hook switch once if you want
to make another call.

4. Last Number Redial - Whether or not you complete a call, the number dialed
is retained in memory until a new number is dialed. Just press to get new dial
tone then redial button. Your telephone remembers the last number dialed even
overnight. If you do not want anyone to know which number you dialed last,
pick up the phone and press any number, and hang up.

5. Mute Button - Allows you to hear the other party without them hearing you. To
use the MUTE function, press the mute button. Release the button to return to
normal. If your telephone is wall mounted to temporarily rest the handset
without hanging up, during a conversation, place on top TAB.

6. Flash Button - When you are finished with a call and wish to make another
press the FLASH BUTTON to obtain a dial tone. If you have CALL WAITING
(a custom calling feature) and wish to access a second call, press the FLASH
BUTTON. Press the FLASH BUTTON again to return to the first call.

7. Your telephone has neon bulbs to give a visual indication that it is ringing. The
LEDs illuminate the dial key pad.

TROUBLESHOOTING

Symptom: The telephone doesn’t work (no ring or dial tone).

• Check for loose telephone line. Try another telephone line.

• Try a different phone in the jack. If the problem persists, the fault is not in

the phone.

Symptom: No ring. No visual indication that the phone is ringing.

• Try a different phone. If the problem still exists, the fault is not in the
phone.

Symptom: No ring. Visual indication that the phone is ringing.

• Check the ringer switch. Is it set to OFF?

Symptom: No dial tone.

• Are the line cord plugs ends (to the jack and phone) pushed in firmly until
they click?

• Wiggle the coil cord. Does it fit firmly?

• Test the phone in a different wall jack.

• Plug a different phone in the wall jack and check for a dial tone.

Symptom: Have a dial tone, but can’t dial out.

• Are you in a rotary area? Move the tone/pulse switch to pulse.

• Try a different phone in the jack. If the problem persists, the fault is not in

your phone.

Symptom: Some of the wires break off.

• Solder them if you have the necessary tools and know how to do it.

• Contact Elenco Electronics.

If you need additional assistance, contact Elenco.

3

4

6 7

8

(SCHEMATIC DIAGRAM)

Elenco Electronics, Inc.

150 W.Carpenter Avenue http://www.elenco.com
Wheeling, IL 60090 e-mail: [e-mail]
[phone] Fax:[phone]

HOW IT WORKS

The telephone was invented in 1876. The primary purpose of the telephone is to
transmit and receive voice signals allowing two people with telephones to
communicate with each other. To be of practical value, the telephone must be
connected to a switching. Each subscriber telephone is connected to the
telephone company's Central Office (CO) by two wires referred to as the "Local
Loop." A simplified diagram of this connection is shown in the Block Diagram.
The TIP and RING designation of the "+" and "--" leads come from the days of the
manual switchboard. The tip of the plug the operator use to connect telephones
carried the "+" lead and the ring immediately behind the tip carried the "--" lead.

The central office provides 48 Volts DC to operate telephones. When a telephone
is on the hook, no current flows, and approximately 48 VDC can be measured at
the Tip and Ring terminals on the telephone. A capacitor in series with the ringer
prevents DC current flow through the ringer. When the handset is picked up, the
hook switch connects the voice circuit to the line, and DC current flows from the CO
battery, through the wires and the telephone. Due to the resistance in the wires and
CO equipment, the voltage at the telephone will drop to about 6 to 12 Volts.

The current flow is detected by a current sensor in the CO, and the switching and
control system (from here on we'll just call it "the system") responds by sending a
dial tone to the telephone. The system then waits for dialing to begin. When
dialing is complete, the CO checks to see if the dialed telephone is busy; if the
dialed telephone is on hook (the current sensor on the dialed telephone line
provides this information), then a 90 Volt AC ringing signal is sent to the dialed
telephone and the ringer will ring, signaling that someone is calling. When the
handset is picked up, DC current will be drawn from the CO battery, signaling the
system that the called party has answered. The system stops providing 90 VAC
ringing voltage and connects the two phone lines together, letting the parties talk.

As you can imagine, the system is not simple. Along with the tasks mentioned
above, it must generate busy signals, keep track of the length of calls for billing
purposes, route calls to other COs, and connect voice recordings to advise you of
problems in completing calls.

The ringer circuit is connected directly across the Tip and Ring inputs. The
capacitor blocks the 48 VDC that is present on the inputs when the phone is on
the hook. To signal an incoming call, the Central Office places a 90 VAC 20Hz
signal on top of the 48 VDC. A special circuit oscillates the frequency at about
3kHz. The buzzing sound is thus produced by the buzzer changing dimensions
at 3kHz. During the positive portion of the 20Hz ringing signal, the three neon
bulbs give a visual indication of the incoming call.

When the hook switch is not depressed the telephone is ready to transmit and
receive. The rectifier protects the integrated circuit (IC) and other components
that may be damaged by a reversal of polarity transmission begins when you
speak into the microphone. The main elements of the dialer are the keyboard and
the dialer IC.

PARTS LIST & IDENTIFICATION

Contact Elenco Electronics if any parts are missing or damaged. DO NOT contact your place of purchase as they will not be able to help you.

Spring

6FUN75516

Bracket Right

6FUN75515

Bracket Left

6FUN75514

Cradle Case

Front

6FUN75501

Screw

2.6 x 7mm
Phillips

6FUN75518

STEP 1
PARTS

Lever

6FUN75517

Screw

2.6 x 6mm
w/washer

6FUN75541

Big Washer

6FUN75513

Plate

6FUN75511

STEP 2

PARTS

Cradle Case

Back

6FUN75502

Buzzer Pad

780125

Battery Snap

590098

Screw

2.6 x 6mm
Phillips

6FUN75518

Resistor

10kΩ 5% 1/2W

(brown-black­orange-gold)

151001

Test Jack

621019

STEP 3

PARTS

PC Board
(with line and
cradle jacks)

6FUN75504

Straight

Telephone Line

6FUN75503

Tubing #14 1.5”

890014

STEP 4

PARTS

Index Label

6FUN75507

Screw

3 x 7mm Phillips

6FUN75518

Index Label

Shield

6FUN75508

Screw

2.6 x 10mm
Phillips

6FUN75541

Handset Case

Front

6FUN75520A

Push Button

Panel

6FUN75524

STEP 5

PARTS

Decorative Piece

6FUN75526

Keypad Buttons

6FUN75525

Flash and Redial

Buttons

6FUN75528

Mute Button

6FUN75527

Speaker

(with 2 wires)

6FUN75536

Speaker Pad
Blue Double

6FUN75531A

STEP 6

PARTS

Keypad Contact

6FUN75529

STEP 7

PARTS

PC Boards

6FUN75523A

Screw

2.6 x 6mm
Phillips

6FUN75518

Rubber

Microphone Cup

6FUN75534

STEP 8

PARTS

Screw

2.6 x 14mm
Phillips

6FUN75539

Tubing #14 1.5”

890014

STEP 9

PARTS

Handset Case

Back

6FUN75521A

Coiled Cord

6FUN75522A

Phone Number

Shield

6FUN75533
Foam Feet

6FUN75509

FCC Label

6FUN75510

Screw 2.6 x 14mm

Phillips

6FUN75539

STEP 10

PARTS

Phone Number

Label

6FUN75532

9

10 11

12

X2

X2

X2

X3

X4

X2

X2

X6

THIS UNIT COMPLIES WITH
PART 68 FCC RULES FCC NO.

GXA1CHN-74412-TE-E REN NO. 1.3B

USE STRANDARD JACK USOC RJ11C

X4

X2

X2

For all the tests you need to make a test cable
using a 9V battery snap, a test jack, and a 9V
battery.

First check:

a. If your kit has a red wire on the input jack

going from point T1 (on Ringer PCB) and
green/black wire going from point T2, make
the test cable as shown. See Step 8 on the
other side for Wiring/Tubing Assembly
instructions.

- OR -

b. If your kit has a red wire on the input jack going from point T2 (on

Ringer PCB) and a green/black wire going from point T1, reverse
the wire connections on the test jack. See Step 8 on the other
side for Wiring/Tubing Assembly instructions.

Plug the telephone line into the input jack of the PC board and the test
cable jack as shown. Next, plug the 9V battery into the battery snap.

No tone should be heard.

Connect the 10kΩ resistor to the leads of R2 and D1 (see figure).

You should hear a tone from the buzzer when the resistor is connected the two leads . Now
remove the resistor and the tone will stop.

Ringer test fails, then:

a. Check that the battery is connected with the right polarity to the test cable.
b. Check your 10kΩ resistor.
c. Check wires from buzzer and jack to PC board. Be sure that none of these wires

have broken off.

d. Check the telephone line for a good connection.

Remove the test cable from the ringer PC board. Return to Step 3 of the Assembly
Instructions.

RING TEST

(Black)
Green

Red

Red

Black

(Green)

3/4” Tube

Battery

Snap

Test
Jack

5

Test Cable Assembly

T1
T2

SW2

OFF

ON

Input Jack

Test Cable

Straight Telephone Line

9V

Battery

Solder Side

of PC Board

Test Jack

Ringer

PC Board

10kΩ Resistor