Circuit Diagrams; Power (Smps) Circuit Diagram - NAD T517AHT Service Manual

CIRCUIT DIAGRAMS

1. POWER (SMPS) CIRCUIT DIAGRAM

No Power
D105~D108 is Defective
No Power
FR101 is Defective
A B C D
Switching Error
IC101is Defective
3.3VA No Power
D121 or D122 are Defective
Switching Error
IC102,IC103 are Defective
E F G H I
3-35
IMPORTANT SAFETY
WHEN SERVICING THIS CHASSIS, UNDER NO CIR-
CUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE NAD. ALL COMPONENTS SHOULD BE
REPLACED ONLY WITH TYPES IDENTICAL TO
THOSE IN THE ORIGINAL CIRCUIT. SPECIAL COMPO-
NENTS ARE SHADED ON THE SCHEMATIC FOR
14VA No Power
D125 is Defective
5.6VA No Power
D123 is Defective
J K L M N
3-36
NOTE :
EASY IDENTIFICATION. THIS CIRCUIT DIAGRAM MAY 1. Shaded( ) parts are critical for safety. Replace only
OCCASIONALLY DIFFER FROM THE ACTUAL CIR- with specified part number.
CUIT USED. THIS WAY, IMPLEMENTATION OF THE 2. Voltages are DC-measured with a digital voltmeter dur-
LATEST SAFETY AND PERFORMANCE IMPROVE- ing Play mode.
MENT CHANGES INTO THE SET IS NOT DELAYED
UNTIL THE NEW SERVICE LITERATURE IS PRINTED.
12V No Power
Q123 is Defective
5.0V No Power
Q126 is Defective
3.3V No Power
Q121 is Defective
O P Q R S T