Sony SRF-HM55 Radio User Manual

The Sony SRF-HM55 is a portable digital radio with AM/FM tuner, digital tuning with preset stations, large LCD display with backlight, built-in speaker, headphone jack, alarm and sleep timer functions, and battery or AC adapter operation. 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 Radio Functions 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital tuner with AM/FM bands, LCD display, Speaker, Headphone jack, AC adapter port, Battery compartment.

Feature	Description
AM/FM Tuner	Digital tuning for clear reception
LCD Display	Shows frequency, time, preset number, and battery status
Preset Stations	Store up to 20 stations (10 AM, 10 FM)
Headphone Jack	3.5mm jack for private listening
Built-in Speaker	For room-filling sound
AC Adapter Port	For power connection (DC IN 4.5V)
Battery Compartment	Holds 3 AA batteries for portable use
ALARM/SLEEP	Sets alarm or sleep timer
TUNING/PRESET	Manual tuning and preset selection
POWER	Turns radio on/off

Installation

Unpack and inspect contents. Place on stable surface.

Insert batteries: Open battery compartment, insert 3 AA batteries observing polarity.
Connect AC adapter: Plug adapter into DC IN port and wall outlet (optional).
Extend antenna: Fully extend telescopic antenna for best reception.
Connect headphones: Plug into headphone jack for private listening.

WARNING! Use only specified AC adapter. Incorrect voltage may damage radio.

First-Time Setup

Power on radio; follow initial setup.

Set time: Hold CLOCK button, use TUNING to set hour/minute, press CLOCK to confirm.
Tune stations: Press BAND to select AM/FM, use TUNING to find station.
Save presets: Tune to station, hold PRESET for 2 seconds, select preset number.
Adjust volume: Use VOLUME control knob.

CAUTION! Keep away from moisture and extreme temperatures.

Specifications

Tuner: AM (530-1710 kHz), FM (87.5-108 MHz).
Power Supply: 3 x AA batteries or AC adapter (4.5V DC).
Battery Life: Approx. 50 hours (alkaline batteries, volume medium).
Speaker: 2.5 inch dynamic speaker.
Output: Headphone jack (3.5mm stereo).
Display: LCD with backlight (adjustable).
Functions: Sleep timer (15-90 min), Alarm (buzzer or radio).
Dimensions: Approx. 150 x 90 x 30 mm.
Weight: Approx. 300g (without batteries).

Controls and Settings

Front Panel: POWER, VOLUME, TUNING, BAND, PRESET, CLOCK, ALARM/SLEEP, DISPLAY.

Display Indicators: AM/FM, preset number, battery level, alarm on, sleep timer.

Tuning: Manual with TUNING knob or auto-scan (hold TUNING). Presets: Store/recall 20 stations. Time: Set with CLOCK button. Alarm: Set alarm time and source (buzzer/radio). Sleep: Set sleep duration (15-90 min). Display: Adjust backlight brightness (3 levels).

Connecting Devices

Headphones: 3.5mm stereo jack. AC adapter: DC IN 4.5V port.

Turn off radio before connecting devices.
Plug headphones fully into jack.
Ensure AC adapter voltage matches specification.

Tip: Use headphones for better sound quality and private listening.

Using Radio Functions

Supports AM/FM listening with preset memory.

Power on: Turn POWER knob.
Select band: Press BAND to toggle AM/FM.
Tune: Turn TUNING knob or hold for auto-scan.
Save preset: Hold PRESET, select number (1-20).
Recall preset: Press PRESET, select number.
Set alarm: Hold ALARM, set time with TUNING, select source.
Set sleep timer: Press SLEEP repeatedly to select duration.
Adjust backlight: Press DISPLAY to cycle brightness levels.

WARNING! Do not expose to direct sunlight for extended periods.

Accessibility Features

Large display with adjustable backlight for low-light visibility. Tactile controls with distinct shapes. Headphone jack for private listening.

Care & Cleaning

Remove batteries before cleaning. Use soft, dry cloth only; do not use chemicals.

CAUTION! Do not immerse in water; avoid contact with liquids.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Dead batteries/wrong adapter	Replace batteries; use correct AC adapter.
Poor reception	Antenna position/location	Extend antenna fully; move to different location.
No sound	Volume/mute/headphones	Increase volume; check if headphones are plugged in.
Display dim	Backlight setting/batteries	Adjust backlight; replace weak batteries.
Presets lost	Batteries removed too long	Re-save stations; replace batteries promptly.
Alarm not working	Settings/power	Check alarm settings; ensure radio has power.

Reset: Remove batteries for 1 minute to reset microcomputer.

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