Troubleshooting Guide - NAD D7050 Service Manual

Connect AC Cord fr om D7050
NO
IS AMBE R LED LIGH TE D?
YES
PRESS STB T OUCH KEY MAKE NO
THE U NIT WORK NORMALLY ?
YES
IS IR NORMA L?
YES
NO
IS BLUE T OOTH NORMAL?
YES
NO
IS AIR PLAY NORMAL?
YES
NO
IS 12V T RIGG ER NORMAL?
YES
NO
IS PREOUT NORMAL?
YES
OK
TROUBLE SHOOTING GUIDE
YES
IS LED RED?
NO
YES
IS LED WHIT E?
NO
NO
IS ALL POWER SUPPLIES OK?
YES
NO
IS MOSFET BROKE N?
CHECK BLUE TOOTH CIRCUIT
CHECK AIRPLAY SUPPLIE S
CHECK TRIGGE R CIRCUIT
CHECK CONNECTER
10
CHECK THE LED CONTROL CIRCU IT ,
AND PROTECET CIRCUIT
CHECK TOUCH BOARD ,
OR SOFTWARE ER ROR
CHECK THE 5V SUPPLY CIRC UIT
CHECK THE OVC& VOV CIRCU IT