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December 2005
SERVICE MANUAL NAD
C 300
C 300
STEREO
AMPLIFIER
STEREO
AMPLIFIER
TABLE OF CONTENTS
DESCRIPTION P AGE
REAR PANEL/FRONT PANEL VIEW................................................3
SPECIFICATIONS......................................................................4-5
DISASSEMBLY INSTRUCTIONS.....................................................6
ALIGNMENT PROCEDURE............................................................7
PCB LAYOUT......................................................................... 8-9
SCHEMATIC DIAGRAM...........................................................10
WIRING DIAGRAM......................................................................11
IC BLOCK DIAGRAM...................................................................12
ELECTRICAL PARTS LIST......................................................13-16
EXPLODED VIEW PARTS LIST.....................................................17
EXPLODED VIEW.......................................................................18
PACKING DIAGRAM...................................................................19
_SERVICE SAFETY PRECAUTIONS_
1. Replacing the fuses
CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE, REPLACE ONLY WITH
DESIGNATED TYPE OF FUSE FOR *AH, *B1, *B AND *C VERSIONS.
Reference No Part Number Description
F701--F702 20-00500-25 T5AL250V Fuse
F703--F704 20-00050-25 T0.5AL250V Fuse
NOTE:
<*AH> : USA, CANADIAN MODEL ONLY.
<*B> : UK MODEL ONLY.
<*B1> : AUSTRALIAN MODEL ONLY.
<*C> : EUROPEAN MODEL ONLY.
2. Safety check out
(Only U.S.A. Model)
Before returning the product to the customer, make leakage current or resistance measurements to
determine that exposed parts are acceptably insulated from the supply circuit.
Parts marked with the symbol " ! "are critical with regard to the risk of fire and electric shock. Replace
only with parts recommended by the manufacturer.
SPECIFICATIONS
POWER AMPLIFIER SECTION
STEREO MODE
CONTINUOUS AVERAGE POWER OUTPUT INTO 8 OHMS...................25W
(Min. Power per channel, 20Hz-20kHz, both channels driven,
with no more than rated distortion)
Rated impedance.............................................................................4-8ohms
Rated distortion (THD 20Hz-20kHz).....................................................0.03%
Clipping power (maximum continuous power per channel) .......................30W
IHF dynamic headroom at 8 ohms.......................................................+2.4dB
IHF dynamic power
8 ohms: ......................................................43W
4 ohms: ......................................................65W
2 ohms: ......................................................90W
Damping factor (ref. 8 ohms 50Hz) ......................................................>100
Peak undistorted O/P current (into 0.1--0.5ohms, both channels running) ...40A
Frequency response at 20Hz-20kHz (Tone Control in)..............................0