Nad C 420 Service Manual
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Extracted text from Nad C 420 Service Manual (Ocr-read)
Page 2
SERVICE SAFETY PRECAUTIONS
1. 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 A are critical with regard to the risk of fire and electric shock.
Replace only with parts recommended by the manufacturer.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS ........................................................... 3
REAR PANEL/ FRONT PANEL ................................................. 4
DISASSEMBLY INSTRUCTIONS ................................................ 5
BLOCK DIAGRAM ........................................................... 6
WIRING DIAGRAM .......................................................... 7
ADJUSTMENT POINTS DIAGRAM .............................................. 8
INSTRUMENT SETUP ........................................................ 9
ALIGNMENT PROCEDURES .................................................. 10
PCB LAYOUT ........................................................... 11-12
SCHEMATIC DIAGRAM ................................................... 13-16
IC BLOCK DIAGRAM ..................................................... 17-19
ELECTRICAL PARTS LIST ................................................. 20-25
EXPLODED VIEW .......................................................... 26
EXPLODED VIEW PARTS LIST ................................................ 27
PACKING DIAGRAM ........................................................ 28
Page 25
EXPLODED VIEW PARTS LIST
ITEM Part No. Description Qfl
0100 *AH 1402-3515-1 CHASSIS C420 AH W/SS-PAINT 1
0100 *C 1402-3514-1 CHASSIS C420 C W/SS-PAINT
0101 1402-3530-0 COVER 1
0102 1403-7120-1 FASCIA 1
0105 A 1806-3541-0 X'FORMER 120/23OV VP 1
0106 2442-1000-0 POWER BUTTON 1
0107 2444-1201-0 BUTTON TRIO 2
0108 2444-1301-1 BUTTON RACKER 1
0109 2600-4008-0973 FLAT WASHER M4X0.8X9.7 B2 2
0110 2640-4030-0703 M4 NUT (BLK) 2
0111 2842-3367-0 METAL WASHER |D=3.3 OD=6.7 5
0112 2900-4006-3010 M4X0.5PX6MM W/FLAT WASHER 4
0113 2900-4010-3030 PH W/WASHER M4X10 BL ZN 2
0114 2904-3006-0000 SCREW M3X6 3
0116 2954-3008-0000 TAPPING 3X8MM B-TITE (YEL.ZN) 20
0117 2954-3006-0000 3X6MM B-TITE (YEL.ZN) 2
0119 2954-3008-3000 T3X8MM SELF TAPPING 14
0126 3716-4314-0 WINDOW LENS W/SS 1
0127 1402-3782-1 STRAP 1
0129 A 4152-3851-0 SQ. STRAIN RELIEF BUSHING 1
0130 4152-4331-0 POWER BUTTON BEZEL 1
0131 4152-4631-0 RUBBER FOOT 14MM HIGH 4
0132 4152-4641-0 CUSHION FOOT 4
0133 4154-0031-0 BEZEL TRIO 2
0134 4154-0091-0 BEZEL RACKER 1
0136 *AH A 7009-3100-2 AC CORD 18AWGX2 SPT-2 UL/CSA D.|NSULATED 1
0136 *C A 7009-3110-0 AC CORD (SEMKO) 1
0137 3714-5706-0 LED LENS CLEAR SAN 1
J2020 7012-5260-0 FLEXIBLE CABLE 35F L=150 1
NOTE: The components identified by A mark are critical for risk of fire and electrical shock.
Replace only with part number specified.
<*AH > : USA, Canadian model only.
<*C > : European model only.
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