Sony ISF-904L Radio User Manual

The Sony ISF-904L is a versatile AM/FM digital radio with advanced tuning capabilities, preset memory stations, LCD display with backlight, alarm clock functions, sleep timer, and auxiliary input for external audio devices. Powered by AC adapter or optional battery backup. 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 Advanced Functions 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital tuner with LCD display, Speaker, Control buttons, Auxiliary input jack, AC power input, Headphone jack.

Feature	Description
AM/FM Tuner	Digital tuning with auto-scan and manual tuning
Preset Memory	Store up to 20 stations (10 AM, 10 FM)
LCD Display	Backlit display showing frequency, time, and settings
Alarm Clock	Dual alarm with radio or buzzer option
Sleep Timer	Auto shut-off from 15 to 90 minutes
Auxiliary Input	3.5mm jack for connecting MP3 players or other audio sources
Headphone Jack	For private listening
Power Source	AC adapter (included) or 4 x D batteries (optional)
Tuning Methods	Auto-scan, manual tuning, direct frequency entry
Sound Adjustment	Bass and treble controls

Installation

Unpack and inspect contents. Place on stable, level surface away from heat sources and moisture.

Connect power: Plug AC adapter into DC IN jack on rear, then into wall outlet.
Extend antenna: Fully extend FM wire antenna; rotate for best reception.
For AM reception: Rotate radio to find optimal position.
Insert batteries (optional): Install 4 D batteries for backup power.

WARNING! Use only specified AC adapter. Do not expose to water or extreme temperatures.

First-Time Setup

Connect power; radio will enter standby mode.

Set time: Press CLOCK button, use HOUR/MIN buttons to set correct time.
Select band: Press BAND button to choose AM or FM.
Auto-tune stations: Press and hold TUNING +/- for 2 seconds to auto-scan.
Save presets: Tune to desired station, press and hold a number button (1-10) for 3 seconds.
Adjust sound: Use BASS and TREBLE buttons to preference.

CAUTION! Ensure proper ventilation; do not block rear speaker grille.

Specifications

Tuner: AM (530-1710 kHz), FM (87.5-108 MHz).
Presets: 20 total (10 AM, 10 FM).
Power Output: 5W RMS.
Speaker: 4" full-range driver.
Display: LCD with adjustable backlight.
Inputs: Auxiliary (3.5mm), DC IN.
Outputs: Headphone (3.5mm).
Power Source: AC 120V, 60Hz via adapter; or 4 x D batteries.
Dimensions: 12" W x 7" H x 5" D.
Weight: 4.4 lbs (without batteries).

Controls and Settings

Front Panel: POWER, BAND, TUNING +/-, PRESET 1-10, CLOCK, ALARM 1/2, SLEEP, BASS/TREBLE, VOLUME.

Rear/Side: AC INPUT, AUX IN, HEADPHONE, FM ANTENNA.

Tuning: Auto-scan (hold TUNING), manual (press TUNING), direct entry (use number keys while holding DIRECT). Presets: Store by holding number; recall by pressing number. Clock: Set with CLOCK button. Alarm: Set ALARM 1/2, choose radio or buzzer. Sleep: Press SLEEP repeatedly for 15-90 min timer. Sound: Adjust BASS/TREBLE in 7 steps each.

Connecting Devices

Auxiliary Input: Connect external audio player via 3.5mm cable. Headphones: Plug into HEADPHONE jack.

Ensure radio and external device are powered off.
Connect cable from device's headphone/line-out to AUX IN on radio.
Turn on both devices.
Press BAND repeatedly until "AUX" appears on display.
Adjust volume on both devices for optimal sound.

Tip: For best audio quality, set external device volume to 75% and adjust with radio volume control.

Using Advanced Functions

Alarm Functions: Dual independent alarms.

Set alarm time: Press and hold ALARM 1 or 2, set time with HOUR/MIN.
Select source: Press ALARM SOURCE to choose radio (last station) or buzzer.
Activate: Press ALARM ON/OFF to enable/disable.
Snooze: Press SNOOZE when alarm sounds for 9-minute delay.

Sleep Timer: Press SLEEP repeatedly to select duration (15, 30, 45, 60, 90, OFF). Display shows remaining time.

Direct Tuning: Hold DIRECT button, enter frequency using number keys (e.g., 1-0-2-5 for 102.5 FM).

WARNING! Battery backup only maintains clock and presets; alarms may not function during power outage without batteries.

Accessibility Features

Large Display: High-contrast LCD with adjustable backlight (press DIMMER). Tactile Buttons: Raised markings for key controls. Audio Feedback: Confirmation beep for key presses (can be disabled in settings).

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth for exterior. For stubborn stains, dampen cloth with water only; never use solvents.

CAUTION! Do not allow moisture to enter vents or controls. Never immerse in water.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection	Check AC adapter connection; try different outlet; check batteries if used.
Poor FM reception	Antenna position	Extend FM antenna fully; reposition radio; avoid obstructions.
No sound from AUX	Connection/setting	Ensure cable securely connected; select AUX mode; check external device volume.
Alarm not sounding	Settings/power	Verify alarm is ON; check source selection; ensure power connected.
Display dim or blank	Backlight setting	Press DIMMER to adjust brightness; check power saving mode.
Presets lost	Power interruption	Re-enter presets; install batteries for backup memory.

Reset: Hold POWER and BAND for 10 seconds to restore factory settings (presets will be lost).

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