Sony Walkman SRF-HM55 Radio User Manual

The Sony Walkman SRF-HM55 is a portable AM/FM stereo radio with digital tuning, 20 station presets (10 FM, 10 AM), auto-scan tuning, LCD display with backlight, built-in speaker, stereo headphone jack, telescopic antenna, and operates on 2 AA batteries. Features include lock switch, sleep timer, and easy-to-use controls for on-the-go listening. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Using the Radio 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: LCD display with backlight, telescopic antenna, built-in speaker, headphone jack, control buttons, battery compartment.

Feature	Description
Telescopic antenna	For improved FM reception; extend fully for best results
LCD display	Shows frequency, station preset, battery level, time
Headphone jack (3.5mm)	For private stereo listening
Built-in speaker	For shared listening without headphones
Battery compartment	Holds 2 AA batteries (not included)
POWER/HOLD switch	Turns radio on/off; locks controls to prevent accidental operation
TUNING buttons	Manual tuning up/down; press and hold for auto-scan
PRESET buttons	Store and recall up to 20 favorite stations
BAND button	Switches between FM and AM bands
SLEEP button	Sets sleep timer (15-90 minutes)

Installation

Unpack and inspect contents. Ensure all parts are present.

Install batteries: Open battery compartment, insert 2 AA batteries observing correct polarity (+/-).
Extend antenna: Fully extend telescopic antenna for FM reception.
Connect headphones: Plug 3.5mm stereo headphones into jack for private listening.
Slide POWER/HOLD switch to ON position.

WARNING! Use only recommended battery type. Do not mix old and new batteries. Remove batteries if not using for extended period.

First-Time Setup

Power on radio; follow these steps for initial configuration.

Set time: Press and hold CLOCK button, use TUNING buttons to set correct time.
Auto-scan for stations: Press and hold TUNING up/down button to scan and store available stations.
Save presets: Tune to desired station, press and hold PRESET button (1-10) for 2 seconds.
Adjust volume: Use VOLUME control wheel on side of unit.

CAUTION! Keep away from strong magnetic fields which may affect performance.

Specifications

Tuning Range: FM 87.5-108 MHz, AM 530-1710 kHz.
Preset Memory: 20 stations (10 FM, 10 AM).
Power Supply: 2 AA batteries (DC 3V).
Battery Life: Approx. 50 hours (headphone), 30 hours (speaker).
Output: Headphone jack output 3.5mm stereo.
Speaker: Built-in monaural speaker.
Display: LCD with EL backlight.
Dimensions: Approx. 115 x 72 x 25 mm.
Weight: Approx. 130g (without batteries).

Controls and Settings

Front Panel: POWER/HOLD switch, LCD display, PRESET buttons (1-10), BAND button. Side: VOLUME wheel, TUNING buttons, SLEEP button.

Display Indicators: FM/AM band, frequency, preset number, battery level, clock, sleep timer.

Tuning: Manual (TUNING buttons) or auto-scan (press and hold TUNING). Presets: Store by holding PRESET button; recall by pressing once. Sleep Timer: Press SLEEP repeatedly to set 15-90 min. Clock: Press CLOCK to display time; hold to set. Hold Function: Slide switch to HOLD to disable all buttons.

Connecting Devices

Headphones: Standard 3.5mm stereo plug. External antenna: Not supported; use telescopic antenna only.

Ensure radio is off before connecting headphones.
Insert headphone plug fully into jack.
Adjust volume to minimum before putting on headphones.

Tip: For best FM reception, extend antenna fully and orient vertically. For AM, rotate radio for best signal.

Using the Radio

Supports FM stereo and AM mono reception.

Power on: Slide POWER/HOLD switch to ON.
Select band: Press BAND to choose FM or AM.
Tune station: Use TUNING buttons or auto-scan.
Adjust volume: Turn VOLUME wheel to desired level.
Use presets: Press numbered PRESET button for saved station.
Sleep timer: Press SLEEP to set shut-off time (15-90 min increments).
View time: Press CLOCK to toggle time display.
Lock controls: Slide to HOLD position when not in use.

WARNING! Do not listen at high volume for extended periods to prevent hearing damage.

Accessibility Features

Backlight: LCD backlight illuminates for 5 seconds when any button is pressed. Large buttons: Clearly labeled for easy operation. Tactile volume wheel: Easy to locate and adjust by touch.

Care & Cleaning

Remove batteries before cleaning. Use soft, dry cloth only; do not use solvents or abrasive cleaners.

CAUTION! Keep away from water and extreme temperatures. Do not disassemble unit.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. This device complies with Part 15 of FCC Rules. Copyright © Sony Corporation. Sony and Walkman are trademarks of Sony Corporation. For support, visit www.sony.com/electronics/support or contact Sony Customer Service at 1-800-222-7669.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Dead batteries/HOLD switch	Replace batteries; ensure HOLD switch is not engaged.
Poor FM reception	Antenna not extended/location	Extend antenna fully; move to different location.
No sound from speaker	Headphone plugged in/volume	Remove headphones; increase volume.
Presets not saved	Batteries removed too soon	Hold PRESET button for 2+ seconds until beep; replace batteries within 30 seconds.
Display dim or blank	Low batteries/backlight off	Replace batteries; press any button to activate backlight.

Reset: Remove batteries for 1 minute to reset all settings.

Service: 1-800-222-7669; www.sony.com/electronics/support