NAD C 326BEE Service manual

DRAFT DATE: 01 MAR 2010

NAD

SERVICE MANUAL

C 326BEE

Stereo Integrated Ampliﬁer

C 326BEE

Stereo Integrated Ampliﬁer

SAFETY INFORMATION

1.5A

SERVICE SAFETY PRECAUTIONS

1. Replacing the fuses

CAUTION:

FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE.

Reference Designator Database Part Number Description

F601*AH 20-001-0086-90 FUSE 3.15A 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO F601*C,CT LBC 5X20mm TSD UL/CSA/VDE/ SEMKO (RoHS)

NOTE:

<*AH > : USA, CANADIAN MODEL ONLY. <*C, *CT > : 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 supply circuit.

20-001-0076-90 FUSE 1.6A 250V TIME LAG

Parts marked with the symbol

are critical with regard to the risk of ﬁre and electric shock.

CONTENTS

DESCRIPTION PAGE

SPECIFICATIONS ..............................................................................................................................4 - 5

REAR PANEL / FRONT PANEL VIEW ...................................................................................................6

DISASSEMBLY INSTRUCTIONS ...........................................................................................................7

WIRING DIAGRAM ......................................................................................................... ..................8 - 9

BLOCK DIAGRAM.................................................................................................................................10

ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .......................................................11

PCB LAYOUT .................................................................................................................................12 - 15

SCHEMATIC DIAGRAM .................................................................................................................16 - 19

ELECTRICAL PARTS LIST ............................................................................................................20 - 31

IC BLOCK DIAGRAM .....................................................................................................................32 - 34

EXPLODED VIEW ..........................................................................................................................35 - 36

EXPLODED VIEW PARTS LIST ....................................................................................................37 - 38

PACKING DIAGRAM .............................................................................................................................39

SPECIFICATIONS

PRE AMPLIFIER SECTION

LINE LEVEL INPUT, PRE-OUT

THD (2 Vin 2 Vout, CCIF IMD, DIM 100) > 0.004 % (ref. 20 Hz – 20 kHz) Signal/Noise ratio IHF >100 dB (A-weighted, ref. 500 mV) >108 dB (A-weighted, ref. 2V, Volume max.)

>92 dB (A-weighted, ref. 100 mV in 100 mV out - unity gain)

Channel separation - 1 kHz >80 dB 10 kHz >70 dB

Input impedance (R and C) 100 kΩ+ 320 pF Maximum input signal >8 Vrms (ref. 0.1 THD) Output impedance - Pre out 75 Ω Tape out Source Z + 1 kΩ Input sensitivity 159 mV (ref. 500 mV out) Frequency response ± 0.1 dB (ref. 20 Hz - 20 kHz, Tone defeat ON) ± 0.5 dB (ref. 20 Hz - 20 kHz, Tone defeat OFF) Maximum voltage output - IHF load >10 V (ref. 0.03% THD) 600 ohms load >10 V (ref. 0.03% THD)

TONE CONTROLS

Treble ± 5 dB at 10 kHz Bass ± 8 dB at 100 Hz

POWER AMPLIFIER SECTION

MAIN IN, SPEAKER OUT Continuous output power into 8 Ω and 4 Ω (Stereo) >50 W (ref. rated THD, 20 Hz-20 kHz, both channels

driven)

Rated THD (CCIF IMD, DIM 100) <0.009 % (ref. 20 Hz - 20 kHz) Clipping power >65 W (ref. 1 kHz 1% THD)

IHF dynamic power - 8 Ω 100 W 4 Ω 150 W 2 Ω 200 W

Peak output current >20 A (ref. 1 Ω, 1 ms) Signal/Noise ratio >100 dB (A-weighted, ref. 1 W) >117 dB (A-weighted, ref. 150 W) Damping factor >100 (ref. 8 Ω, 50 Hz and 1 kHz) Frequency response ± 0.1 dB (ref. 20 Hz - 20 kHz) 3 Hz – 70 kHz (ref. -3 dB) Input impedance 20 kΩ + 1 nF Input sensitivity 630 mV (ref. rated power) Voltage gain 29 dB Headphone output impedance 68 Ω Channel separation - 1 kHz >80 dB 10 kHz >70 dB

TRIGGER OUT

Output resistance <100 Ω Output current 50 mA Output voltage +12 V

OVERALL SPECIFICATIONS

CD IN, SPEAKER OUT

THD (250 mW to rated power, CCIF IMD, DIM 100) <0.009 % (ref. 20 Hz - 20 kHz) Signal/Noise ratio >94 dB (A-weighted, ref. 1 W) >110 dB (A-weighted, ref. 50 W, volume set for 2V

Frequency response ± 0.2 dB (ref. 20 Hz - 20 kHz, Tone Defeat ON) 10 Hz – 65 kHz (ref. -3 dB) Channel separation - 1 kHz >80 dB 10 kHz >70 dB

POWER CONSUMPTION

Rated power 290 W (ref. 230V AC 50 Hz; 120V AC 60 Hz) Standby power <1 W Idle power <35W

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth) 435 x 100 x 286 mm (Net) 435 x 116 x 332 mm (Gross*)

* - Gross dimensions include feet, volume knob and extended speaker terminals. Net Weight 7.1 Kg (15.62 lbs) Shipping Weight 9.1 Kg (20.02 lbs)

REAR PANEL / FRONT PANEL VIEW

REAR PANEL

1. MP INPUT

2. CD INPUT

3. TUNER INPUT

4. DISC INPUT

5. AUX INPUT

6. VIDEO INPUT

FRONT PANEL

7. TAPE IN/OUT

8. SUB 1, SUB 2

9. PRE OUT

10. MAIN IN

11. SOFT CLIPPING

12. +12V TRIGGER OUT

13. IR IN/OUT

14. SPEAKERS

15. POWER SWITCH

16. AC MAINS INPUT

1. STANDBY

2. STANDBY LED

3. SOFT CLIPPING INDICATOR

4. REMOTE SENSOR

5. PHONES

6. MP SOCKET

7. INPUT SELECTOR

8. TONE DEFEAT

9. TONE CONTROLS

10. BALANCE

11. VOLUME

DISASSEMBLY INSTRUCTIONS

1. Remove machine screws M4.0 x 8.0 (x 4pcs) from the side panels. Remove tapping screw 3.0 x 8.0 (x 3pcs) from the back panel. Refer to Figure No. 1.

Figure No. 1

2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35 ° and then remove in the direction as indicated. Refer to Figure No. 2.

Figure No. 2

WIRING DIAGRAM

WIRING DIAGRAM PARTS LIST

Item Database Part Number Description Remark

1 17-012-4444-90 CABLE ASSY 3 WAYS AWG18 3.96P PIN 2 VOID PSU BD-J605, UL1672 L=170mm (B/BR) (RoHS) J606 2 17-012-4422-90 CABLE ASSY 9 WAYS AWG=26 2.5P UL1007 PSU BD-J601A L=240mm (RoHS) 3 17-012-2956-90 Cable assy 1 way AWG18 UL1007 BLACK L=100mm PHONE BD-J510

W/RING TERMINAL(RoHS) 4 17-012-4536-90 CABLE ASSY 2 WAYS AWG26 2.5P UL2468 L=700 PHONE BD-

(RoHS) J508A 5 17-012-4424-90 CABLE ASSY 7 WAYS AWG=28 2.0P UL1007 L=350mm KEY BD-J506A (RoHS) 6 17-012-4425-90 CABLE ASSY 6 WAYS AWG=28 2.0P UL1007 L=410mm KEY BD-J507A (RoHS) 7 17-012-4426-90 CABLE ASSY 10 WAYS AWG=28 2.0P UL1007 KEY BD-J501A

L=420mm (RoHS) 8 17-012-4427-90 CABLE ASSY 2 WAYS AWG=26 2.5P UL1007 L=80mm KEY BD-J504A (RoHS) 9 17-012-4423-90 CABLE ASSY 15 WAYS AWG=26 2.5P UL1007/1533 VOL BD-J201A L=80mm (RoHS) 10 17-012-4420-90 CABLE ASSY 2 WAYS AWG=16 3.96P WHI/RED MAIN BD-J13/ UL1015 L=100mm (RoHS) J16, J14/J15 11 17-012-4428-90 CABLE ASSY 5 WAY AWG26 2.5P UL1007 L=250mm MAIN BD-J101A (RoHS) 12 17-012-4483-90 CABLE ASSY 1 WAY AWG14 UL1015 L=80mm BLACK MAIN BD-J104, W/ RING TERMINAL (RoHS) J204 13 17-012-4484-90 CABLE ASSY 1 WAY AWG14 UL1015 L=110mm WHITE MAIN BD-J103 W/ RING TERMINAL (RoHS) 14 17-012-4485-90 CABLE ASSY 1 WAY AWG14 UL1015 L=110mm RED MAIN BD-J203 W/ RING TERMINAL (RoHS) 15 17-012-4521-90 CABLE ASSY 3 WAYS AWG16 3.96P BLACK UL1015 MAIN BD-J7A/ L=200/120/220mm (RoHS) P6/J6A 16 17-012-4529-90 CABLE ASSY 2 WAYS AWG26x1C 2.5P UL1533 L=90 MAIN BD (RoHS) J306A/B 17 17-012-4530-90 CABLE ASSY 2 WAYS AWG26x1C 2.5P UL1533 L=110 MAIN BD (RoHS) J106A/B 18 17-012-4531-90 CABLE ASSY 2 WAYS AWG26x1C 2.5P UL1533 L=130 MAIN BD (RoHS) J105A/B 19 17-012-4532-90 CABLE ASSY 2 WAYS AWG26x1C 2.5P UL1533 L=180 MAIN BD (RoHS) J305A/B

BLOCK DIAGRAM

ADJUSTMENT POINT DIAGRAM

A. Idle Current adjustment

1. Turn on the unit without any input for 15 minutes

2. For left channel, adjust VR103 Voltage across TP1 & TP2 3 – 3.5mV

3. For right channel, adjust VR303 Voltage across TP3 & TP4 3 – 3.5mV

4. With the unit keep turning on, wait for another 15 minutes

5. Re-adjust VR103 Voltage across TP1 & TP2 3 – 3.5mV

6. Re-adjust VR303 Voltage across TP3 & TP4 3 – 3.5mV

B. ISC adjustment

1. Turn VR304 fully anti-clockwise,

2. Use 500mV, 1kHz sine wave, CD input, 4 ohm loading to both channels

3. Increase the output power of both channels to 8V

4. Slowly rotate VR304 clockwise until the voltage at TP10 is the same as TP11

5. Verify the output at 20kHz 8 ohm loading to both channels are larger than 21V, if not, repeat step 1-4 again

PCB LAYOUT

MAIN BOARD - COPPER SIDE

+ 28 hidden pages

NAD C 326BEE Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual