5PRECAUTIONS• Refer all work related to the installation of thisproduct to qualified service personnel or systeminstallers.• Do not block the ventilation opening or slots on thecover.To prevent the appliance from overheating, place it atleast 5 cm (2 inches) away from the wall.• Do not drop metallic parts through slots.This could permanently damage the appliance. Turnthe power off immediately and contact qualified servicepersonnel for service.• Do not attempt to disassemble the appliance.To prevent electric shock, do not remove screws orcovers.There are no user-serviceable parts inside. Contactqualified service personnel for maintenance.• Handle the appliance with care.Do not strike or shake it, as this may damage the appli-ance.• Do not expose the appliance to water or moisture,nor try to operate it in wet areas.Take immediate action if the appliance becomes wet.Turn the power off and refer servicing to qualified ser-vice personnel. Moisture may damage the applianceand also cause electric shock.• Do not use strong or abrasive detergents whencleaning the appliance body.Use a dry cloth to clean the appliance when it is dirty.When the dirt is hard to remove, use a mild detergentand wipe gently.• Be sure to install the disk recorder horizontally.• Do not operate the appliance beyond its specifiedtemperature, humidity or power source ratings.Use the appliance at temperatures within +5°C - +45°C(41°F - 113°F) and a humidity below 85 %.The input power source for this appliance is 120 V AC60 Hz.• Fully charge up the backup battery.Keep the appliance turned on for at least 48 hours torecharge the backup battery. This procedure is neces-sary when using the appliance for the first time or afterit has been unplugged for a long time from the AC out-let. Insufficient charging of the battery may cause era-sure of settings if the AC power supply should fail. Thebattery, if fully charged, will back up the settings for 72hours in an ordinary environment.• CompatibilitiesThere are some compatibility restrictions between theWJ-HD500B and the optional devices: Network Boardsand the capacity of the HDD installed in the connectedExtension Units.*1: Contact your dealer.A: Applicable combination*1: Contact your dealer.A: Applicable combination• It might occur some kind of malfunction of “RECORD”or “PLAY”, or “damage or defect of recorded data”, dueto failure or trouble of machine. Any kind of consequentdamage or loss arising from such problem is not sub-ject of warranty.Network BoardWJ-HDB502*1WJ-HDB502BADigital DiskRecorderWJ-HD500BCapacity per one HDD unit160 GB or more*1A120 GB or lessAAExtensionUnitsWJ-HDE500/505WJ-HDE500B/505B