Denon AVR-E300 Service Manual

Also see for AVR-E300: Owner's manual Getting started Getting started

Contents

67TROUBLE SHOOTING1. POWER1.1. Power not turn onYES YESYESNONOYESNONOWhen the power turned on,does the X indicator on thefront panel flashing green?Is the fuse blown?About 10 seconds later,does the X indicator onthe front panel turn lightinggreen ?Check voltage of CN771 (4-7PIN) of DIGITAL B'D whilethe X indicator is flashinggreen.Pull out connector (BN502) ofMAIN BD, and check "2. Errorschecking mode".(Refer to 23 page.)Power not turn on.Is the fuse blown?When the power turned on,does the Xindicator on the front panelflashing red?Is a DC 5V voltage beingsupplied from the SMPSB'D (BN601) to the DIGITALB'D?Refer to 1.2.Fuse is blown.Refer to 1.2. Fuse is blown.Check circuitry and parts from CN751on the DIGITAL B'D to the μ-com fordamage and shortcircuits, and replaceany defective parts.Check "2. Errorschecking mode".(Refer to 23page.)Are there any incompleteconnections in the connectorsconnecting between thevarious circuit boards?Is a DC 5V voltage outputwhen the cord supplying thepower from the SMPS B'Dto the DIGITAL B'D (CN751)is unplugged?Check μ-com peripherycircuitry of DIGITAL B'D andreplace any defective parts.Check circuitry and parts fromCN751 on the DIGITAL B'Dto the μ-com power supply fordamage and shortcircuits, andreplace any defective parts.Connect the connectors properly.To troubleshooting 6.SMPS.(Refer to 76page.)NOYESYES4,6,7 PIN : 0V5 PIN : 3.3V4,6,7 PIN : 3.3V5 PIN : 0VYES NONO NOCheck for leaks or shortcircuits in the primary sideparts, and replace anydefective parts.Fuse is blownCheck for short circuits in therectifier diodes and circuitry ofthe secondary side rectifyingcircuits, and replace anydefective parts.After repairing, also replace the fuse.Check for short circuits inthe power stabilizer unit'sregulator output terminal andthe ground, and replace anydefective parts.1.2. Fuse is blownYES