Roberts R757 Instruction Manual

3-Band

Portable

Radio

Operating Instructions

BY APPOINTMENT TO

HER MAJESTY THE QUEEN

SUPPLIERS & MANUFACTURERS

OF RADIO AND TELEVISION

ROBERTS RADIO LIMITED

ROBERTS

Sound for Generations

R

Controls (top panel)

1

2

1. Headphone socket

2. On/Off and Volume control

3. Tone control button

If you need any further advice, please

call our Technical Helpline on

020 8758 0338 (Mon-Fri)

3

4

6

5

4. Waveband buttons

5. Tuning control

6. Telescopic aerial

2

AC Adaptor

Classic Range

Revival Range

3

If you need any further advice, please

call our Technical Helpline on

020 8758 0338 (Mon-Fri)

General

Do not allow this unit to be exposed to water, steam or sand. Do not leave the unit
where excessive heat could cause damage such as in a parked car where the heat
from the sun can build up even though the outside temperature may not seem too
high. It is recommended that the FM band be used were ever possible as better
results in terms of quality and freedom from interference will usually be obtained
than on the MW or LW bands.

Mains adaptor

Plug the adaptor into a 13A mains outlet. Plug the lead from the adaptor into the
DC socket, located on the rear of Revival models and on the left hand end on
Classic models. The battery will be automatically disconnected.

The mains adaptor should be disconnected from the mains supply when not in
use.

Battery

Revival models. Open the rear door by releasing the catch on the right-hand side
of the case.

Classic models. Remove the battery cover on the base of the unit by unscrewing
the retaining stud using a suitable coin or screwdriver.

Fit the battery IEC 6F100 (PP9) to the connector.

Revival models. Close the rear door and fasten the catch.

Classic models. Replace the battery cover and refit the stud.

Reduced power, distortion, and a ‘stuttering’ sound are all signs that the battery
may need replacing.

If the radio is not to be used for any extended period of time it is recommended
that the battery is removed from the radio.

We would recommend for economy, this radio is used via the Mains
adaptor whenever possible with battery operation for occasional or stand­by use only.

4

Radio Operation

Your radio is equipped with three wavebands to enable you to select the
programme of your choice. The FM band uses an external telescopic aerial
which should be fully extended and rotated for best reception. MW and LW
bands are received by an internal aerial which is directional. To achieve the
best reception, it may be necessary to rotate the radio.

1. Switch on the receiver by rotating the volume control clockwise until a
click is heard.

2. Depress the appropriate waveband button for FM MW or LW as
required.

3. Tune to the desired programme by adjusting TUNING control. On
MW and LW the tuning scale is marked in kilohertz (kHz) and on FM
in megahertz (MHz).

4. Adjust the volume and tone controls to the desired tone and sound
level. Depressing the TONE control button reduces high frequencies
(treble).

Headphones

A 3.5mm socket is provided for use with either headphones or an earpiece.
Inserting a plug automatically mutes the internal loudspeaker.

5

Care

For external cleaning use only a soft clean cloth. Use a damp cloth to clean the
cabinet. A mild soap will help remove grease or oil. Never use strong detergents,
spray cleaners, abrasive powders, thinners or solvents as these may cause
damage to the radio.

Specifications

Power Requirements 9.0V DC

Battery 1 x IEC 6F100 (PP9)

If you need any further advice, please

call our Technical Helpline on

020 8758 0338 (Mon-Fri)

6

Battery Life Approx. 80hrs of listening for 4 hours a day at

normal volume.

Circuit Features

Semiconductors 3 Integrated circuits, 1 Voltage regulator.

Output Power 1watt RMS into 8ohms

Headphone socket 3.5mm dia

Frequency Coverage

FM 87.5 -108MHz

MW 522 - 1620kHz

LW 150 - 281kHz

The Company reserves the right to amend the specification without notice.

Guarantee

This instrument is guaranteed for twelve months from the date of delivery to the original owner against failure due to
faulty workmanship or component breakdown, subject to the procedure stated below. Should any component or part
fail during this guarantee period it will be repaired or replaced free of charge.

The guarantee does not cover:

1. Damage resulting from incorrect use.

2. Consequential damage.

3. Receivers with removed or defaced serial numbers.

N.B. Damaged or broken telescopic aerials will not be replaced under guarantee.

Procedure:

Any claim under this guarantee should be made through the dealer from whom the instrument was purchased. It is
likely that your Roberts dealer will be able to attend to any defect quickly and efficiently, but should it be necessary
the dealer will return the instrument to the company’s service department for attention. In the event that it is not
possible to return the instrument to the Roberts dealer from whom it was purchased, please contact Roberts Radio
Technical Services Department at the address shown on the back page of this manual before taking further action.

These statements do not affect the statutory rights of a consumer.

7

ROBERTS RADIO TECHNICAL SERVICES DEPARTMENT

97-99 Worton Road
Isleworth Middlesex

TW7 6EG

Technical Helpline:-020 8758 0338

Issue 2