NAD C 325BEE Service Manual

Also see for C 325BEE: Owner's manual Notes on usage Service manual

Contents

NAD C 325BEE Service Manual Manual pdf 24 page image

TROUBLESHOOTING GUIDEPUSH THE POWER SUPPLYIS THE AMBER LED AMBERYESNOCAN PRESSING ANY KEY MAKEOKIS IT RED? NOYESCHECK THE PROTECT CIRUITNO CHECK THE 5V SUPPLY CIRCUIT(ON POWER BOARD)YESCHECK THE AMBER LED CONTROLIS IT GREEN?CIRCUIT(Q72,Q73,Q74,LED717)NONOIS THE STANDBY SINGAL LOWLEVEL?CHECK THE STANDBY CONTROLCIRCUITIS THE ABMER LED GREEN?YESNOCHECK THE KEYS CONNECTIONSOME KEYS IS USELESS?IS THE IR IN/OUT NORMAL?YESNOIS THE 18V SUPPLY NORMAL? CHECK THE 18V SUPPLYIS THE SPK OUT NORMAL?YESNO NO CHECK THE SERVO CIRCUITIS THE POWER AMP INPUT YESNOCHECK THE POWER AMP CIRCUITSECTIONIS THE MUTE SIGNAL OFF? YES CHECK THE MUTE CONTROLCIRCUITNONOYESCHECK THE MODULES CIRCUITIS THE VOLUME CONTROL CIRCUITNORMAL?CHECK THE VOLUME CONTROLCIRCUITIS THE 12V SUPPLY NORMAL?YESTHE UNIT WORK NORMALLY?YESNOYESNOYESNOYESNOLIGHT?YESYESCHECK 12V SUPPLYCHECK THE LED CONTROLCIRCUIT(Q72,Q73,Q74,LED717)AND PROTECET CIRCUITCHECK MCU AND RELAYCONTROL CIRCUITIS THE OUTPUT DC LEVELNORMAL?ARE ALL POWER SUPPLIES OK? CHECK THE POWER SUPPLIESCIRCUITYESNO YESIS THERE SIGNAL OUTPUT? NORMAL?ARE THE TWO MODULES NORMAL?CHECK THE TONE CIRCUITYESNOIS THE THD HIGH?YESIS THE IDLE CURRENT NORMAL?IS THE S/N RATE BAD? TURN THE TRANSFORMERADJUST THE IDLE CURRENT ORCHECK THE IDLE CURRENTCIRCUITNOCHECK THE POWER AMP CIRCUIT(IF SOME TRANSISTORS AREDEFEATED)IS THE REMOTE CONTROL OK? CONNECTION OR CIRCUIT(PARTS)NORMAL? ANOTHER REMOTE CONTROLNONOYESYESCHECK THE IR CONTROL CIRCUIT(INCLUDE THE IR RECEIVER ANDGROUND?YESNONO YESYESCHECK THE IR IN/OUTREPLACE THE BTTERIES ORHANDSETMCU)CHECK THE CONNECTIONAND CHECK IF THE RELATIONALTRANSISTORS ARE DEFEATEDDID THE 12V SUPPLY SHORTIS THE REMOTE HANDSET ITSELFSWITCH TO ON24www.hifiengine.com