NAD CI 940 - Page 8

TROUBLESHOOTING GUIDE
Connect AC Cord from CI940
IS THE AMBER LED LIGHTED?
NO
YES
IS IT RED?
CHECK THE 5V SUPPLY CIRCUIT
CHECK THE LED CONTROL CIRCUIT
,AND PROTECET CIRCUIT
YES
THE UNIT WORK NORMALLY?
CAN PRESSING STB KEY MAKE
NO
IS POWER MODE RIGHT?
CHECK THE 5V SUPPLY CIRCUIT
NO
YES
IS THE ABMER LED AMBER
AMBER
IS THE STANDBY SINGAL LOW
CHECK THE PROTECT CIRUIT
CHECK THE STANDBY CONTROL
YES
NO
YES
CHECK MCU CONTROL CIRCUIT
YES
IS THE SPK OUT NORMAL?
NO
IS THE OUTPUT DC LEVEL NORMAL? CHECK POWERAMP CIRCUIT
IS THERE SIGNAL OUTPUT?
YES
YES
NO
CHECK INPUT BOARD CIRCUIT
IS INPUT BOARD OUT NORMAL?
NO
YES
NORMAL?
CHECK THE MUTE CONTROL
IS THE MUTE SIGNAL OFF?
YES
CHECH NJW1194 AND PREAMP
IS PROTECT CIRCUIT NORMAL
CIRCUIT
NO
YES
IS THE THD HIGH OR ABNORMAL
YES
WAVEFORM?
OPEN THE UNIT FOR OVERALL
CHECK
NO
NO
AMP CIRCUIT
IS 12V TRIGGER NORMAL?
CHECK 12V OUT CONTROL CIRCUIT
IS BRIDGE MODE NORMAL?
CHECK PHONE CIRCUIT
OR CONNECTION
OK
NO
NO
YES
YES
POWER ON BY POWER SWITCH OF REAR PANEL
RED
CHECK POWERAMP CIRCUIT
OR CHANGE AUTO ON MODE TO
TO TRY AGAIN
OR RED?
NO
IS AUDIO SENSE CIRCUIT NORMAL?
CHECK AUDIO SENSE CIRCUIT
NO
YES
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