Nad C 720bee User manual

NAD

SERVICE MANUAL

C720BEE

STEREO

RECEIVER

C720BEE

STEREO

RECEIVER

TABLE OF CONTENTS

DESCRIPTION P A G E

SERVICE CAUTION……………………………………………………………..3

REAR PANEL/FRONT PANEL VIEW………………………………………...4

SPECIFICATIONS………………………………………………………….5-7

ALIGNMENT PROCEDURE……………………………………………..6-7

WIRING DIAGRAM………………………………………………………………8

BLOCK DIAGRAM……………………………………………………. …….9-15

ALIGNMENT PROCEDURE……………………………………………..16

SCHEMATICS……………………………………………………………….17-20

PCB LAYOUT……………………………………………………………… 21-24

SPECIAL FUNCTION/TROUBLE SHOOTING GUIDE…………………..25

ELECTRICAL PARTS LIST…………………………………………….26-34

EXPLODED VIEW……………………………………………………………..35

EXPLODED VIEW PARTS LIST……………………………………………...36

- 2 -

PROTECT IC CHANGE ..............……………………………………..……...37

SERVICING PRECAUTIONS

CAUTION:Before servicing the Stereo Receiver covered by

this service data and its supplements and addends, read and

follow the SAFETY PRECAUTIONS.NOTE: if unforeseen

circumstances create conflict between the following servicing

precautions and any of the safety precautions in this publication,

always follow the safety precautions.

Remember Safety First:

General Servicing Precautions

1.Always unplug the Stereo Receiver AC power cord from the

AC power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnecting or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an electrolytic

capacitor.

Caution: A wrong part substitute or incorrect polarity

installation of electrolytic capacitors may result in an

explosion hazard.

2.Do not spray chemicals on or near this Stereo Receiver or

any of its assemblies.

3.Unless specified otherwise in this service data, clean

electrical contacts by applying an appropriate contact

cleaning solution to the contacts with a pipe cleaner,

cottontipped swab, or comparable soft applicator.

Unless specified otherwise in this service data, lubrication

of contacts is not required.

4.Do not defeat any plug/socket B+ voltage interlocks with

which instruments covered by this service manual might be

equipped.

5.Do not apply AC power to this Stereo Receiver and/or any

of its electrical assemblies unless all solid-state device heat

sinks are correctly installed.

6.Always connect test instrument ground lead to the

appropriate ground before connecting the test instrument

positive lead. Always remove the test instrument ground lead

last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the

power on. Connect an insulation resistance meter (500V) to the

blades of the attachment plug. The insulation resistance

between each blade of the attachment plug and accessible

conductive parts (Note 1) should be more than 1 M-ohm.

Note 1: Accessible Conductive Parts including Metal panels,

Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged

easily by static electricity. Such components commonly are

called Electrostatically Sensitive (ES) Devices. Examples of

typical Es devices are integrated circuits and some field effect

transistors and semiconductor chip components.

The following techniques should be used to help reduce the

incidence of component damage caused by static electricity.

1.Immediately before handing any semiconductor component

or semiconductor-equipped assembly, drain off any

electrostatic charge on your body by touching a known earth

ground. Alternatively, obtain and wear a commercially

available discharging wrist strap device, which should be

removed for potential shock reason prior to applying power to

the unit under test.

2.After removing an electrical assembly equipped with ES

devices, place the assembly on a conductive surface such as

aluminum foil, to prevent electrostatic charge buildup or

exposure of the assembly.

3.Use only a grounded-tip soldering iron to solder or unsolder

ES devices.

4.Use only an antistatic solder removal device. Some solder

removal devices not classified a “anti-static” can generate

electrical charges sufficient to damage ES devices.

5.Do not use freonpropelled chemicals. These can generate

electrical charge sufficient to damage ES devices.

6.Do not remove a replacement ES device from its protective

package until immediately before you are ready to install it.

(Most replacement ES devices are packaged with leads

electrically shorted together by conductive foam, aluminum

foil, or comparable conductive material).

7.Immediately before removing the protective material from the

leads of a replacement ES device, touch the protective

material to the chassis or circuit assembly into which the

device will be installed.

Caution: Be sure no power is applied to the chassis or circuit,

and observe all other safety precautions.

8.Minimize bodily motions when handing unpackaged

replacement ES devices. (Normally harmless motion such as

the brushing together of your clothes fabric or the lifting of

your foot from a carpeted floor can generate static electricity

sufficient to damage an ES device.)

- 3 -

1&2 FM&AM ANTENNA

3. SPEAKER A&B

4. SWITCHED AC OUTLET

5. AC LINE CORD

6. VACATION SWITCH ON/OFF

7. SOFT CLIPPING

8. SUBW OUT

9. MAIN IN

10. PRE-OUT

11. RECORD OUT/ZONE 2

12. TAPE IN

13. AUX INPUT

14. VIDEO INPUT

15. CD INPUT

16. DISC INPUT

17. IR INPUT/OUTPUT

18. +12V TRIGGER OUT

FRONT PANEL/REAR PANEL

- 4 -

Power Amplifier Section

CONTINUOUS AVERAGE POWER

OUTPUT AT 8 OHMS 50W (17dBw)

(Minimum RMS power per channel, both channels

driven, With no more than the rated distortion)

Rated distortion (THD)(20Hz –20kHz) İ0.03%

Channel Separation ı70dB

(MAIN IN, 20W Out at 8ȍ,1kȍshorted, 1kHz)

Clipping power, 1kHz 68W

(Maximum continuous power per channel)

Dynamic Headroom at 8 ohms 3.4dB

Dynamic power 8ohms 110W

(Maximum short-term power per channel ) 4ohms 160W

2ohms 210W

Damping factor ı100

Slew factor ı50

Slew rate ı20V/ȝsec

T.H.D and SMPTE I.M. İ0.03%

(Distortion from 250mW to rated output)

IHF I.M. (CCIF IM) and T.I.M distortion İ0.03%

(From 250mW to rated output))

Input impedance 22kȍ//470pF

Input sensitivity( For 50 Watts out) ı700mV

Power amp gain 29dB

Preamplifier Section

Input Impedance 22kȍ//100pF

SPECIFICATIONS

NAD C720BEE Stereo Receiver

Note: Specifications are measured in accordance with EIA

Standard RS-490 (IHF A-202) for amplifiers and ANSI-IEEE

Standard 185(1975), i.e. input and converted to equivalent

300-ohm values.

- 5 -

Signal-to-Noise ratio 110dB ref 500mV

(A-weighted, 1kHz CD In, Pre-Out)

Rated distortion (THD)(20Hz –21kHz) İ0.03%

Channel Separation ı70dB

2V CD IN, 2V Pre-Out,1kȍshorted,1kHz

Input Sensitivity 320mV for 1V out

Input Overload ı10V

Frequency response tone defeat +/-0.1dB

tone on +/-0.5dB

THD (SUB OUT) İ0.03%

(2V CD in, 2V SUB out; 50Hz, 80kHz LPF)

THD (ZONE 2 OUT)

(2V CD IN, 1kHz, 80kHz LPF) İ0.03%

Frequency Response(SUB OUT)

50Hz) İ3dB at 100Hz

Outputs

Preamp output impedance 80ȍ

Zone2 output impedance Source Z+ 600ȍ

Controls

Treble ±5dB at 10kHz

Bass ±8dB at 100Hz

Pre-in ,Power AMP out,input 2V

Signal-to-Noise ratio, A-weighted 98dB ref 1 W out

(500mV CD in, SPK out, 8ȍ, A weighted)

Rated distortion (THD)(20Hz –20kHz) İ0.03%

Input sensitivity 225mV

(CD in, SPK out, at rated power, volume max.)

Channel Separation ı70dB

(CD in, 20W out at 8ȍ, 1kȍshorted, 1kHz)

Frequency response tone defeat +/-0.1dB

tone on +/-0.5dB

Usual sensitivity Mono, -30dB THD+N İ12dBuV

Mono, 50 dB S/N İ25dBuV

Tuner FM Section(At 75kHz deviation for AH ; 40kHz for C)

- 6 -

Capture ratio (at 45 and 65 dBf) İ3 dB

AM rejection (at 65 and 85dBf) ı40 dB

Alternative channels Selectivity ı40 dB

(RF±400KHz, at 30dB)

Image rejection(at usable sensitivity) ı70 dB

I.F. rejection (at usable sensitivity) ı70 dB

Pilot suppression (1kHz, 60dBu) ı55 dB

THD Mono, 1kHz, 60dBu İ0.8%

Stereo, 1kHz, 60dBu İ1%

Signal-to-noise ratio (Mono, 60dBu) ı60 dB

Frequency response(50Hz -15kHz) ±3dB

Stereo separation (1kHz; 60dBu) ı35 dB

Usable sensitivity (at S/N=20dB) İ60 dBȝ

THD (74dBu input , 30% mod ) İ3%

1 signal Selectivity(at usable sen.)ı20 dB

Image rejection(at usable sen.)ı28 dB

I.F. rejection (at usable sen.) ı40 dB

S/N ratio(30% mod, 80dBu input) ı40 dB

Physical Specifications

Width × Height × Depth 435x133x350mm

Net Weight 8.7kg

Shipping Weight 10.3kg

Power Consumption 110W

(50/60 Hz, at 110 or120VAC for AH, 230 or

240VAC for C)

Tuner AM Section(30% mod)

- 7 -

PCB-10 HEADPHONE BOARD

PCB-2 POWER BOARD

UL2468 AWG#26, WHITE, 150mm

PCB-6 AC OUTPUT BOARD

CZ45

TRANSFORMER

UL3266 AWG#18 190mm

UL1007 AWG#22

150mm

270mm

UL1672 AWG#22

CZ703

CZ702

PCB-4 VFD BOARD

PCB-7 OUT MODULE BOARD

CZ703

(Insert)

CB62

CZ701

PCB-5 POT BOARD

UL2468 AWG#26

WHITE, 130mm

CB31

PCB-3 KEY BOARD

FPC 1.25-19P-710mm

WHITE

CB33

CZ34

(Insert)

UL2468 AWG#26

WHITE, 400mm

PCB-8 IN MODULE BOARD

CB61

UL1672 AWG#18

UL1672 AWG#22, 150mm

CB49

CB47

CB45

RED, 100mm

PCB-9 MUTE BOARD

CB34

CB32

(Insert)

WIRING DIAGRAM

CB59

PCB-1 MAIN BOARD

FPC 1.25-17P-180mm

TUNER MODULE (KST-MB114MA0/1-23)

CZ35

WHITE, 500mm

UL2468 AWG#26

CON 01

CZ36 CZ37

WHITE

WB01HS-001(C) UL1672 AWG#18

CB58

CB54

CB52CB51

CB55

CB53

RED, 130mm

WB05HS-001(AH)

CB56

CB57

AC POWER PLUG

POWER SWITCH

TUNER R

FROM TUNER MODULE

INPUT SELECTION

CIRCUIT (BY RELAY)

DISC L

DISC R

CD R

VIDEO R

AUX R

TAPE R

TAPE L

AUX L

VIDEO L

CD L

IC 33

CD4094

IC31

NJU7313AL

CPU

ZONE 2 L

ZONE 2 R

PREAPM MODULE

AMP CIRCUIT

˄˅

PREAMP MODULE

AMP CIRCUIT

OUT

˄˅

BASS

RT31

RT32

RT34 TREBLE

BALANCE

SW31

TONE DEFEAT

RT33

VOLUME

MUTE

Q310

Q31

Q32

SUB OUT

CONTROL SUB OUT

PRE-OUT L

PRE-OUT R

MAIN IN R

MAIN IN L

SOFT CLIPPING

CONTROL CIRCUIT

S41

POWER AMP

CIRCUIT L

CIRCUIT R

POWER AMP

IC 33

CD4094

PROTECTION

CIRCUIT

(IC44,UPC1237HA)

SPK B

SPK A

7Q416

Q417

C1815

SPKA R

SPKB L SPKA L

SPKB R

RL12/1

JQX-115F/0242HS4AF

RL12/2

JQX-115F/0242HS4AF

CPU

ISC CIRCUIT

(IC43,TL082D)

TRIG I-V

MIRROR

SOURCE

SCR

CIRCUIT

(13,15,16)

(1,2,3)

(4,5,6,7,13,14)

VOL-

VOL+ VOLUME CONTROL

CIRCUIT (REMOTE)

MUTE

CIRUIT

STANDBY (CPU)

JK41

AMBER LED

CONTROL CIRCUIT

R467

POSISTOR

(80 DEGREE C)

R439

POSISTOR

(90 DEGREE C)

BLOCK DIAGRAM

HEADPHONE

FROM TUNER MODULE TUNER RTUNER L

CIRCUIT

CONTROL

CURRENT

CIRCUIT

CONTROL CONTROL

- 9 -

IC702

IS1U60L

+5V

DATA

CLK

DOUT

DIN

CLK

STB

IR OUT

IR IN

PSEN 29

ALE/P 30

TXD 11

RXD 10

P27 28

P26 27

P25 26

P24 25

P23 24

P22 23

P21 22

P20 21

P00 39

P01 38

P02 37

P03 36

P04 35

P05 34

P06 33

P07 32

16 RD

RESET

18 X1

EA/VP

14 T1

INT0

P10

P11

P12

P13

P14

P15

P16

P17

INT1

VCC 40

GND 20

IC704

AT89C55WD

RDS CLK

IC708

TCM810MEND

IC705

11.0592MHz

IR OUT

CIRCUIT

IR IN

CIRCUIT

IC31

NJU7313AL

DATA

CLK

IC703

UPD16311

+5V-30V

CLK

8STB

DIN

DOUT

ENCODER

CONTROL

CIRCUIT

10k 2k 470

Q712

+5V

Sandby control line

24C64

18V Power Supply

Circuit

STR

CLK

IC707

4094

STR

CLK

IC32

4094

STR

CLK

IC33

4094

DATA

CLK

ST2

CLK

DATA

10K10K10K10K10K10K10K10K

+5V

RDS DATA

PLL CE

PLL D0

PLL D1

PLL CLK1

TUNER

STEREO

KST-MB114MA0/1

TUNER MODULE

RDS CLK

RDS DATA

PLL CE

PLL D0

PLL D1

PLL CLK1

TUNER

STEREO

22pF

4.7pF

MICROPROCESSOR CONNECTION DIAGRAM

Vdd

Vee

+5V

FLASH

Power Suplly

Display circuit

DATA

14 15

uPC1237HA

MAIN BOARD: IC44

Overload Detector

Output Offset Detector

Switch for latch/automatic --reset

Flip--Flop

VCC ON

MUTE

AC---OFF detector

Relay driver

GND

VCC

AT24C64A

KEY BOARD: IC705

PIN CONFIGURATION

8VCC

SCL

SDAGND

PIN NAME

A0--A2

SDA

SCL

ADDRESS INPUTS

FUNCTION

SERIALDATA

SERIAL CLOCK INPUT

WRITE PROTECT

Vcc

GND

SCL

SDA

START

STOP

LOGIC

LOAD

SERIAL CONTROL LOGIC EN H.V. PUMP/TIMING

DATA RECOVERY

X DEC

EEPROM

SERIAL MUX

Dout/ACK

LOGIC

Dout

Din

Y DEC

DATA WORD

ADRR/COUNTER

INC

LOAD

COMP

R/W

DEVICE

ADRRESS

COMPARATOR

ICS BLOCK DIAGRAM

- 11 -

20 21

40 Vcc

P0.0(AD0)

P0.1(AD1)

P0.2(AD2)

P0.3(AD3)

P0.4(AD4)

P0.5(AD5)

P0.6(AD6)

P0.7(AD7)

P2.0(A8)

P2.1(A9)

P2.2(A10)

P2.3(A11)

P2.4(A12)

P2.5(A13)

P2.6(A14)

P2.7(A15)

PSEN

ALE/PROG

EA/VPP

(T2)P1.0

(T2EX)P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

RST

(RXD)P3.0

(TXD)P3.1

(INT0)P3.2

(INT1)P3.3

(T1)P3.5

(T0)P3.4

(WR)P3.6

(RD)P3.7

XTAL1

XTAL2

GND

AT89C55WD

KEY BOARD : IC704 PIN CONFIGURATION

OSC

WATCH

DOG

PORT 1

LATCH LATCH

PORT 0 PORT 2

PORT 0 DRIVERS

PORT 1 DRIVERS

PORT 2 DRIVERS

PORT 3 DRIVERS

QUICK

FLASH

RAM

RAM ADDR.

BACC STACK

PIONTER

PROGRAM

ADDRESS

BUFFER

INCREMENTER

PROGRAM

COUNTER

DUAL DPTR

INTERRUPT,SERIAL PORT

AND TIMER BLOCKS

TMP2 TMP1

ALU

PSW

TIMING AND

CONTROL INSTRUCTION

P1.0 ------ P1.7 P3.0 ------ P3.7

P2.0 ------ P2.7

P1.0 ------ P1.7

- 12 -

CD4094

MAIN BOARD:IC32&IC33

1CL

TR TR

* VDD

VSS

* ALLINPUTS

PROTECTED BY

CMOS PROTECTION

NETWORK

Q'S

SERIAL

OUT

TR LATCH

STATE

SERIAL

OUT

STAGES

3 - 7

4567121314

LATCH

3 -

STATE

CLOCK

STROBE

OUTPUT ENABLE

LATCH

VDD VSS

Q1 Q2 Q3 Q4 Q5 Q6 Q7

3 - STSTE

STROBE

DATA

CLK

Q'S

VSS

VDD

OUTPUT ENABLE

PIN CONFIGURATION

TL082CP/D

MAIN BOARD: IC3, IC4, IC34, IC43

-++ -

8V+

OUTPUT B

INVERTING INPUT B

NON-INVERTING INPUT B

V-

NON-INVERTING INPUT A

INVERTING INPUT A

OUTPUT A

KEY BOARD: IC707

NJU7313AL

MAIN BOARD: IC31

14 15

Vee

L-COM1

L-COM2

L-COM3

R-COM1

R-COM2

R-COM3

DATA

CLK

Vss

PIN CONFIGURATION

Level Shifter

Latch Circuit

Level Shifter

Control Circuit

L-COM 1

L-COM 2

L-COM 3

R-COM 1

R-COM 2

R-COM 3

DATA

CLK

Vss

Vee

Vdd

- 14 -

Vdd

Din

Dout

CLK

STB

OSC

Serial I/F

Command decoder

Display memory

20bit x 16 word

Dimming circuit

20-bit output latch

Timing generator

key scan

key scan memory (4x20)

5-bit latch

4-bit latch

16-bit shift register

Data selector

Grid driver Segment/grid driver Segment driver

LED 1 LED 5

SW1

SW4

TO 4

Key1

Key4

TO 4

20 12

Seg1

Seg12

Seg13/grid16

Seg20/grid9

Grid 8

Grid 1

Vdd

(+5V) Vss

(0V) Vee

(-30V)

uPD16311

MAIN BOARD :IC703

PIN CONFIGURATION(Top View)

14 15 16 17 18 19 20 21 22 23 24 25 26

40414243444546474849505152

Seg1/KS1

Seg2/KS2

Seg3/KS3

Seg4/KS4

Seg5/KS5

Seg6/KS6

Seg7/KS7

Seg8/KS8

Seg9/KS9

Seg10/KS10

Seg11KS11

Seg12KS12

Vdd

SW1

SW2

SW3

SW4

Dout

Din

CLK

STB

KEY1

KEY2

KEY3

KEY4

Grid6

Grid7

Grid8

Seg20/Grid9

Seg19/Grid10

Vee

Vdd

Seg18/Grid11

Seg17/Grid12

Seg16/Grid13

Seg15/Grid14

Seg14/Grid15

Seg13/Grid16

OSC

Vss

LED1

LED2

LED3

LED4

LED5

Vdd

Grid1

Grid2

Grid3

Grid4

Grid5

- 15 -

ALIGNMENT PROCEDURES

I. INITIAL

A. LOWEST VOLUME ADJUSTMENT

3. Connect a oscilloscope to L channel binding posts.

1. Tune the volume pot to lowest state.

2. Input a high voltage signal such as 5V from CD input.

4. Observing the oscilloscope,adjust VR301,make the output of speakers become to the

5. Adjusting VR302,make R channel output become to the lowest level by same way.

B. IDLING CURRENT

1. Connect a DC voltmeter toTP1 and TP2 ,adjust VR22 for 4-5mV reading on voltmeter.

2. Connect a DC voltmeter toTP3 and TP4 ,adjust VR12 for 4-5mV reading on voltmeter.

3. Level power on for a minimum of 5 minutes

II. FINAL ADJUSTMENT

Repeat procedure A and B for lowest volume level and idling current alignment

respectively.

TP1

TP2

TP3

TP4

VR22

VR12 VR301

VR302

MAIN BOARD

lowest level.

- 16 -

C61

220p

R61

220

R63

Q61

2SK170

R67

R69

430 2%

Q63

A970

Q67

D667

C63

22p

R611

Q64

B647

R613

10K

D61

1N4148

D62

1N4148

R615

C65

0.1u 20%

C66

0.1u 20%

C69

100p

R617

10 R619

C62

220p

R62

220

R64

Q62

2SK170

R68

R610

430

Q65

A970

Q68

D667

C64

22p

R612

Q66

B647

R614

10K

D63

1N4148

D64

1N4148

R616

C67

0.1u

C68

0.1u

C610

100p

R618

R620

CB61

CON9

R621

120

C611

15pF

GND

+18V

-18V

LOUT

ROUT

RIN-

RIN+

LIN+

LIN-

PREAMP OUT MODULE CIRCUIT FOR Vm1.6

CB31

CON9

MOTO POT FOR Vm1.6

3 7

2 8

RT33A

POTALPS

3 6

4 5

RT33B

POTALPS

910

RT33C

POTALPS

RCA31A

DISC

RCA31C

RCA32A

AUX

RCA32C

VIDEO

R31

470

R33

470

R35

470

C31

100p

C33

100p

C35

100p

R37

470 C37

100p

RL31B

RL32B

RL33B

RL34B

R349

22K

R351

22K

R353

22K

R355

22K

L-CH INPUTS

C720BEE INPUT SELECT CIRCUIT

R39

470 C39

100p

RL35B

R357

22K

RCA31B

DISC

RCA31D

RCA32B

AUX

RCA32D

VIDEO

R32

470

R34

470

R36

470

C32

100p

C34

100p

C36

100p

R38

470 C38

100p

RL31A

RL32A

RL33A

RL34A

R350

22K

R352

22K

R354

22K

R356

22K

R-CH INPUTS

R310

470 C310

100p

RL35A

R358

22K

RCA33D

RECORD R

RCA33C

RECORD L

C325

47u/25

R321

3K3 MF

R323

750 MF

R319

N.I.

R325

390 MF

R327

180 MF

C327

22n 5%

C329

0.1u 5% 63V

R329

1K5 MF

R331

390 MF

C331

0.22u 5%

C333

0.97u

C335

470p,50V,20%

SW31A

C339

1u/50

TONE DEFEAT SW

R359

5K1 MF

OFF

TO VOLUME POT

BALANCE POT

BASS POT

TREBLE POT

63V

5%63V

C337

0.1U

C321

0.1u

C720BEE TONE CONTROL CIRCUIT

RT31A

10KA

RT32A

10KA

RT34A

20K MN

SW31B

C326

47u/25

R322

3K3 MF

R324

750 MF

R320

N.I.

R326

390 MF

R328

180 MF

C328

22n 5%

C330

0.1u 5% 63V

R330

1K5 MF

R332

390 MF

C332

0.22u

C334

0.97u

C336

470p,50V,20%

C340

1u/50

TONE DEFEAT SW

R360

5K1 MF

OFF

BALANCE POT

BASS POT

TREBLE POT

63V 5%,63V

5%63V

C338

0.1U

C322

0.1U

RT31B

10KA

RT32B

10KA

RT34B

20K MN

R407

R402

10K R404

10K

R403

1K R405

R406

C417

4u7/50V C418

4u7/50V

Q402

C1815

Q401

A1015

Q404

C1815

Q403

A1015

VOLUME CONTROL

MOTOR

+5V

C303

220p C302

220p

C301

10uF/50V

7 8

RL31C

7 8

RL32C

7 8

RL33C

7 8

RL34C

7 8

RL35C

+12V

RCA34A

L PRE-OUT

Q31

PMBFJ108

C343

N.L. R338

10M

R333

4.7K

R335

C341

47u/25

R347

100K

C345

0.1U

RCA34B

R PRE-OUT

Q32

PMBFJ108

C344

N.L. R339

10M

R334

4.7K

R336

C342

47u/25

R348

100K

C346

0.1U

PHONE1A

IR OUT

PHONE1B

IR IN

PHONE2

+12V Trigger

0.1uF

+12V

RI1 12K

QI1

2SC1815

RI2

QI2

2SA1015 RI3

+5V

C319

0.1u 10%

C324

47u/25

C323

47u/25

C320

0.1u 10%

CB32

LOW NOISE AMP MODULE

-18V

+18V

CB33

LOW NOISE AMP MODULE

+18V

-18V

R345

220K

CZ36

CON17

GND

STEREO

TUNER

PLL CLK1

PLL D1

PLL D0

PLL CE

RDS CLK

RDS DATA

+12V

L-OUT

R-OUT

CZ37

CON8

STEREO

TUNER

PLL CLK1

PLL D1

PLL D0

PLL CE

RDS CLK

RDS DATA

R311

470 C311

1n2

RL36B

R337

22K

TUNER L

R346

220K

R312

470 C312

1n2

RL36A

R341

22K

TUNER R

RCA33B

TAPE

RCA33A

TAPE

7 8

RL36C

Q33

C1815 Q34

C1815 Q35

C1815 Q36

C1815 Q37

C1815

R369

4K7 R371

4K7 R373

4K7 R375

4K7 R377

4K7

C351

10n C352

10n C353

10n C354

10n

CD SEL

DISC SEL

TAPE SEL

AUX SEL

TURNER SEL

DISC TAPEAUX FM/AM

R378

4K7

R376

4K7

R374

4K7

R372

4K7

R370

4K7

Q38

C1815

R379

4K7

R380

4K7

VIDEO

STR 1

CLK 3

4Q2

5Q3

6Q4

VSS 8

9QS

14 OE 15

VCC 16

IC33

4094

STR 1

CLK 3

4Q2

5Q3

6Q4

VSS 8

9QS

14 OE 15

VCC 16

IC32

4094

C357

0.1u

C358

0.1u

+5V

Q39

C1815

R381

5K1

VOL-

VOL+

IR OUT

IR IN

CZ35

CON19

IP SEL DATA

IP SEL CLK

IP SEL ST

Standby

+5V

+12V

VIDIO SEL

C355

10n C356

10n

CZ34

CON9

- +

Vee 1

L1 2

L2 3

L3 4

L4 5

L-COM1 6

L5 7

L6 8

L-COM2 9

L7 10

L8 11

L-COM3 12

ST 13

Vss 14

DATA

R-COM3

R-COM2

R-COM1

Vdd

IC31

NJU7313

OP SEL CLK

OP SEL DATA

D313

16V D314

16V

R367

2K R368

+18V-18V

SPK A

SPK B

SPK A

SPK B

VOL-

VOL+

R382

22K

CD SEL

DISC SEL

TAPE SEL

AUX SEL

TURNER SEL

VIDIO SEL

OP SEL ST

OP SEL CLK

OP SEL DATA

OP SEL ST

IP SEL DATA

IP SEL CLK

IP SEL ST

IP SEL CLK

IP SEL ST

RI6 100

RI4

4.7K

VFD AC1

VFD AC2

R317

470

C317

100p

C318

100p

R318

470

IC34A

TL082CP/D

IC34B

TL082CP/D

R362

11K,MF,1%

C347 100nF.63V,5%

R365

10k

RCA35

SUB-OUT

R363

100 C360

100p

-18V

+18V

R361

11K,MF,1% C348

220nF,63V,5%

R364

10k

R366

10K

+5V

R492

4K7,1%

C441

N.I.

C438

510p

C442

510p

C440

510p

C439

510p C444

0.1uF

C350

820p R388

20k VR302

100

R386

1.8

R384

560 1%

C349

1nF

VR301

100

R387

20K

R385

1.8

R383

560 1%

C61

220p

R61

220

R63

Q61

2SK170

R65

560 2%

R67

R69

430 2%

Q63

A970

Q67

D667

C63

22p

R611

Q64

B647

R613

10K

D61

1N4148

D62

1N4148

R615

C65

0.1u

C66

0.1u 20%

C69

100p

R617

10 R619

C62

220p

R62

220

R64

Q62

2SK170

R66

560 2%

R68

R610

430

Q65

A970

Q68

D667

C64

22p

R612

Q66

B647

R614

10K

D63

1N4148

D64

1N4148

R616

C67

0.1u

C68

0.1u

C610

100p

R618

R620

CB61

CON9

R621

120

C611

40pF

GND

+18V

-18V

LOUT

ROUT

RIN-

RIN+

LIN+

LIN-

PREAMP IN MODULE CIRCUIT FOR Vm1.6

Q310

2SK363

R340

10M

D315

1N4148

C361

N.I.

D37

1N4148 D38

1N4148 D39

1N4148 D310

1N4148 D311

1N4148 D312

1N4148

MUTE

Q311

PMBFJ108

Q312

PMBFJ108

R389

10M

R390

10M R392

100K

R391

100K

C362

10n

RI510K

CB34

CON10

CB34

CON10

MUTE CONTROL CIRCUIT

VFD AC1

VFD AC2

+12V

-30V

+5V

SPK A

SPK B

PROTECTION

GND

-46V

Name

C720BEE AMP Vm1.2.SCH

Q411

A1015 R436

56K

R435

390K

R489

100K

R457

220K

R451

330K

D423

1N4148

R448

100K

C434

22n/63V

+18V

-46V

Z2 IN L

Z2 IN R

Z2 IN R Z2 RI

Z2 RI

Z2 LI

Z2 LI Z2 LO

Z2 LO

Z2 RO

PR RO

PR LO

PR OUT L

PR OUT R

Z2 OUT L

Z2 OUT R

PR IN L

PR IN R

Z2 RO

PR IN L

PR IN R

PR IN L

C364

N.L.

C363

N.L.

D317

1N4148

D316

1N4148

D318

1N4148

D319

1N4148

PCB-8: IN MODLE BOARD FOR Vm5.0PCB-7: OUT MODULE BOARD FOR Vm5.0

PCB-5: POT BOARD FOR Vm5.0

PCB-9: MUTE BOARD 01-72008-00

PCB-1: MAIN BOARD FOR Vm5.0

PREAMP AMP CIRCUIT FOR Vm1.7

SUBOUT 1

SUBOUT 2

01-72004-02 01-72004-01

R446

56K

R445

56K

D420

1N4148

D419

1N4148

+18V

SUPPLY CIR.

+5V

C219

22n 10% 63V

RCA34D

MAIN-IN R-CH

L OUT

R OUT

D412

1N4148

D413

1N4148

+37V

R450

10K

R449

10K

R454

500 R455

500

+37V

Q416

C1815 Q417

C1815

8 4

IC3A

TL082CP/D

R156

470K

R157

470K

C122

1uF,63V,5%

R11

470

C121

1uF,63V,5%

C11

10u/16V

R15

22K

R14

100 Q12

A970

R158

2.2K

Q13

C2240

C12

470p

-18V

+18V

R19

39K,MF,5%

R111

82,MF,5%

R112

82,MF,5%

R110

39k,MF,5%

C14

10u/35V

C13

10u/35V

Q14

C2240

Q15

A970

R115

R116

Q16

A1015

Q17

C1815

R119

82,MF,5%

R120

82,MF,5%

C18

22p

C19

22p

C15

220uF/63V

C16

220uF/63V

Q110

KSA1220

Q111

KSC2690

R124

3.3/0.5W FP

R125

3.3/0.5W FP

R128

330/0.5W FP

R129

330/0.5W FP

R123

47K,5%,1/4

C110

47u/25V

C111

47u/25V

R126

2K7/2W FP

R127

2K7/2W FP

R130

82/1W FS

R131

82/1W FS

R142

22,MF,5%

R143

22,MF,5%

R136

R137

Q112

KSC2690

Q115

2SC5200

Q114

2SA1943

Q113

KSA1220

R144

0.068/3W CE

R145

0.068/3W CE

R139

470

R149

160/1/4W 1%

C116 2200u/6.3V

C117

0.1u 10% 63V

L11

1uH

R150

1/1W FP

R151

10/1W FS

C118

0.1u 10% 63V

C115

0.1u 10% 63V

C114

0.1u 10%

Q19

D667

Q18

B647

D13

1N4148

D15

1N4148

D14

1N4148

D16

1N4148

R121

100K,MF,5%

R122

100K,MF,5%

R21

470

R12

220K

R22

220K

C112

470p,100V,20%

C113

470p,100V,20%

R147

1K Q11

C1815

Q12/1

A1015

R152

22K

R12/1

6K8

R148

15K

C120

22n 10%

D17

1N4148

RCA34C

MAIN-IN L-CH

R146

4K3 1W 1%

R154

R155

Q116

KSC2690

R138

390

Q47

A1015

Q45

A1015

Q46

C1815

R417

100

R419

100

R418

100

R416

100

C415

10u/25V

C416

10u/25V

R422

1.1K

R423

1.1K

R424

1.3K

R425

1.3K

R420

36K

R421

36K

D411

20V

D410

20V

S41A

S41B

OFF

TP4

TP3

C720BEE POWER AMP CIR. R

63V

-18V

+18V +46V

-46V

+46V

-46V

D11

4.7V

D12

4.7V

R103

82,MF,5%

Q103

C2240

C103

100uF/16V

R101

39k,MF,5%

R106

82,MF,5%

Q104

A970

C104

100uF/16V

R105

39k,MF,5%

R104

220k,MF,5% R102

220k,MF,5%

Q101

C2240

Q102

A970

R108

39,MF,5%

R107

39,MF,5%

Q48

C1815

C17

0.1uF/63V

C12/1

47uF/25V

R45

33/0.5W FS R41

680

R43

680

R47

680 C43

220u/50V

C413

220u/35V

Q41

2SD669A

C45

22p

R49

680

R411

680

R413

680

D49

18V

C47

47u/25V

C49

47u/25V

R414

2K2

R46

33 / 0.5W FS

R42

680

R44

680

R48

680

C44

220u/50V

C414

220u/35V

Q43

C1815

C46

22p

R410

680

C48

10u/25V

C410

47u/25V

R412

Q42

2SB649A

Q44

A1015

C411

0.1uF

C412

0.1u 10% 63V

R428

2K2

R429

5K1

-37V

+37V+18V

-18V

R427

22/1W FP

Q413

D669

Q414

C1815

+37V

+12V

R401

4K7

D403

1N4148

STANDBY

Q421

C1815

R469

10K R468

22K

R467

T0=80 degree C

D428

1N4148

+18V

R12/2

22K

C422

330u/16V C421

4u7/50V

C432

0.22u

R441

15K

R442

56K

C420

100u/16V

PROTECTION CIR.

+3.25V

+2.16V

+2.0V

+46V

CB49

4PIN

-46V+46V

CB45 R453

220/2W FP

R452

220/2W FP

R438

22K

R439

T0=90 degree C

Q412

C1815

POSISTOR

+18V

IC44

UPC1237HA

D42

1N4148

D43

1N4148

R437

47K

STANDBY

R440

2K2

+18V

R478

100K

IC43A

TL082D R480

6K2

R482

4K7

R479

100K

C428

10u/25V

C425

10u/25V

R470

10K

R471

10K

D418

1N4148 D417

1N4148

R477

47K

R483

330K

R473

47K

R472

470K

C426

10u/25V

C429

10u/25V

R488

39K

R487

39K

R486

560K

R474

C430

10u/25V

R476

1K C431

10u/25V

R490

100K

R491

100K

IC43B

TL082D

+18V

+18V-18V

ISC CIRCUIT

VR12

300

CB47

10PIN

I-V

AC DET.

ISC TRIG

VFD AC2

VFD AC1

655

433

211

RL12/2

RL12/1

C435

1nF

C436

1nF

R494

10k

R493

10k

C443

0.1uF

R OUT

L OUT

HEADPHONE OUT L

HEADPHONE OUT R

JK41

CZ45

PHONES SOCKET

N8C320D03

R458

100,FP ,5%,2W R459

100,FP ,5%,2W

C41

0.1uF

HEADPHONE OUT CIRCUIT FOR Vm1.7

C119

22n 10% 63V

C21

10u/16V

R25

22K

R24

100

Q22

A970

Q23

C2240

C22

470p,50V,20%

R29

39k,MF,5%

R211

82,MF,5%

R212

82,MF,5%

R210

39k,MF,5%

C24

10u/35V

C23

10u/35V

Q24

C2240

Q25

A970

R215

R216

R203

82,MF,5%

Q26

A1015

Q27

C1815

R219

82,MF,5%

R220

82,MF,5%

C28

22p

C29

22p

C25

220uF/63V

C26

220uF/63V

Q210

KSA1220

Q211

KSC2690

R224

3.3/0.5W FP

R225

3.3/0.5W

R228

330/0.5W FP

R229

330/0.5W

R223

47K

C210

47u/25V

C211

47u/25V

R226

2K7/2W

R227

2K7/2W

R230

82/1W FS

R231

82/1W FS

R242

22,MF,5%

R243

22,MF,5%

R236

R237

Q212

KSC2690

Q215

2SC5200

Q214

2SA1943

Q213

KSA1220

R244

0.068/3W CE

R245

0.068/3W CE

R239

470

R249

160 1/4 1% MF

C216 2200u/6.3V

C217

0.1u 10% 63V

L21

1uH

R250

1/1W FP

R251

10/1W FS C218

0.1u 10% 63v

C215

0.1u 10%

C214

0.1u 10% 63V

TP1

Q29

D667

Q28

B647

D23

1N4148

D25

1N4148

D24

1N4148

D26

1N4148

R221

100K,MF

R222

100K,MF,5%

C212

470p,100V,20%

C213

470p,100V,20%

R247

R248

15K

R252

22K

Q21

C1815

C220

22n 10%

D27

1N4148

R246

4K3/1W 1% MF

R254

R255

Q216

KSC2690

R238

390

TP2

63V

Q203

C2240

C203

100uF/16V

R201

39K,MF,5%

R206

82,MF,5%

R205

39k,MF,5%

C204

100uF/16V Q204

A970

+18V

-18V

+46V

-46V

R202

220k,MF,5%

R204

220k,MF,5%

D21

4.7V

D22

4.7V

Q201

C2240

Q202

A970

R207

39,MF,5%

R208

39,MF,5%

C27

0.1uF/63V

IC4B TL082CP/D

R256

470K

R257

470K

C222

1uF,63V,5%

C221

1uF,63V,5%

R258

2.2k

-18V

+18V

VR22

300

POWER AMP CIR. R

POSISTOR

Binding Posts B

Binding Posts A

SPK B

PROTECTION

SPK A

-30V

VFD AC2

VFD AC1

+18V

-18V

+12V

+5V

Name

C720BEE PREAMP Vm1.2.SCH

ISC Circuit:

It switches the power

supply to a lower

voltage when the load

impedance is low, or

the temperature on

the heatsink is over

80C degrees.

Mount on the heatsink

I/V For

Over

Current

Protection

+18V

-18V

+12V

+5V

-30V

-37V

+37V

PCB-10: HEADPHONE BOARD FOR Vm5.0

POWER AMP CIRCUIT FOR Vm1.7

PCB-1:MAIN BOARD FOR Vm5.0

SCHEMATIC DIAGRAM (1/4)

SUBOUT 1

SUBOUT 2

J204 2PIN

- 18 -

Over Heat Protection:

It shuts down the unit

when the temperature on

the heatsink is over 90C

degrees.

It also shuts down the unit

when the unit enters the

standby mode.

D52

15V

C54

N.I.

AC POWER CORD

C535

4n7/400V SW52 POWER SWITCH

CZ55

C51

10n/250V

D51

KBU8D

C52

10n/250V

D55

KBU8D

C517

15000uF/50V 10%

C518

15000uF/50V 10%

Q518

C1815

Q517

A1015

D531

TIC116D

D532

TIC116D

R558

R563

22K

R561

100

R562

R560

R559

R565

100

R564

22K

R531

0.05/3W 5% CE

R532

220

Q510

A1015

Q59

A1015

R534

2K2

R533

2M2

Q519

A1015

Q520

C1815

R566

4K7

D513

1N4004

R544

22K

C523

3300u/50V

C524

2200u/50V

CB54

CB55

! !

F51F52 F54 F53

GND

+46V

-46V

-37V

+37V

I-V

AC DET.

TRIG

NAD C720BEE POWER CIR.

10% 10%

D501

DB104

C533

4700uF/16V

C536

100uF

CB56

CZ56

F55

500mA/250V

6.3A/250V X4

RED

GRAY

BLACK

ORANGE

PURPLE

CB57

CZ57

CB51

CB52

CZ52

CZ51

CB58

CZ58

2AC OUTLET

36.4V

28.5V

R567

10K

C53

330u/50V

C55

10uF,50V

Q58

KSA1220

D53

30V

R568

3K3

CB53

CON10

T501

TRANSFORMER

32V

VFD

-30V

GND

D54

DB104 2.1V

2.1V

C56

0.22uF

BLUE

RED

YELLO

BLACK

D56

DB104

IC51

AMS1117-5.0

SCHEMATIC DIAGRAM (2/4)

POWER SUPPLY CIRCUIT FOR Vm1.6

PCB-2: POWER BOARD FOR Vm5.0

IR OUT

IR IN

PROTECTION

C712

10n

C717

100u/16V

IC702

IS1U60L

RED

R739

15K

GREEN

Q702

C1815

R718

300

IR RECEIVER

R717

330

LED 701

+5V

PROTECTION

POWER/PROTECTION IND.

513AW

N8C320F08

N8C320F06

+5V

+12V

Q701

C1815

R719

2K2 Q703

C1815

+5V

STEREO

TUNER

PLL CLK1

PLL D1

R740

10K

PLL D0

D707

1N4148

PLL CE

C721

22p

RDS CLK

C722

4.7p

RDS DATA

Y701

12MHz

R705

10K +5V

+5V

Standby

R723

4K7

+5V

R725

4K7 +12V

R724

4K7

R726

4K7

C702

10n

C701

10n

speak a

D709

GREEN

D708

GREEN

+5V

Q704

C1815

Q705

C1815 speak a

OP SEL DATA

Q712

2SC1815

OP SEL CLK

IP SEL DATA

R742

470

IP SEL CLK

IP SEL ST

R743

10K

IP SEL DATA

IP SEL CLK

IP SEL ST2

CZ702

CON19

R711

10k

R712

10k

R710

10K

R713

10K

C706

0.1uF

C707

0.1uF

C708

0.1uF

C705

0.1uF

Vss

4SDA 5

SCL 6

WP 7

Vcc 8

IC705

24C64

C719

0.1uF

C723

0.1u

Standby

C704

0.1uF

R706

10K

S719

SW-PB

OP SEL ST

OP SEL DATA

OP SEL CLK

OP SEL ST

VFD DOUT

VFD DIN

VFD CLK

VFD STB

IP SEL DATA

IP SEL CLK

IP SEL ST

C720

10uF/50V

+5V

R709

10K

R708

10K

R707

10K

R714

10K

R715

10K

R716

10K

IC706

ENCODE

IP SEL CLK

IP SEL DATA

IP SEL ST2

VIDEO

TUNER

AUX

TAPE

IR OUT

IR IN

IR OUT

C718

0.1u

AUX

Q706

C1815

VIDEO

Q707

C1815

Q708

C1815

DISC

Q709

C1815

TAPE

Q710

C1815

Q711

C1815

R727

4K7

R729

4K7

R731

4K7

OP SEL CLK

R733

4K7

OP SEL DATA

R735

4K7

OP SEL ST

R737

4K7

C710

10n

speak b

C711

10n

Flash

C713

10n

speak b

C714

10n

C715

10n

TUNER

C716

10n

DISC

R738

4K7

R736

4K7

R734

4K7

R732

4K7

R730

4K7

R728

4K7

D715

GREEN

D714

GREEN

D713

GREEN

R722

2.2K

D712

GREEN

D711

GREEN

D710

GREEN

STR

2CLK

3OE

15 VCC

Q1 4

Q2 5

Q3 6

Q4 7

Q5 14

Q6 13

Q7 12

Q8 11

QS 9

QS 10

GND 8

IC707

4094

PSEN 29

ALE/P 30

TXD 11

RXD 10

P27 28

P26 27

P25 26

P24 25

P23 24

P22 23

P21 22

P20 21

P00 39

P01 38

P02 37

P03 36

P04 35

P05 34

P06 33

P07 32

16 RD

RESET

18 X1

EA/VP

14 T1

INT0

P10

P11

P12

P13

P14

P15

P16

P17

INT1

VCC 40

GND 20

IC704

AT89C55WD

+12V

D716

1N4148

R748 8*10K

IP SEL ST

R749

10K

IP SEL ST2

RDS CLK

S715

ON/Standby

S716

DISC

S717

S718

TAPE

S711

AUX

S712

S713

S714

SpeakerA

S707

SpeakerB

S708

Preset down

S709

Preset up

S710

Tune down

S703

Tune up

S704

Display

S705

Memory

S706

Blend

S701

FM Mute/Mode

S702

video

D705

1N4148

D704

1N4148

D703

1N4148

D702

1N4148

D701

1N4148

CZ703

CON18

-30V

KEY1

KEY2

KEY3

KEY4

+5V

VFD1

VFD2

VFD1

VFD2

KEY1

KEY2

KEY3

KEY4

VFD DOUT

VFD DIN

VFD CLK

VFD STB

D718

N.I.

D719

N.I.

D717

N.I.

D720

N.I.

R750

D721

N.I.

Flash

R751

C725

510pF

C726

510pF

C724

510pF

R720

2.2K

R721

2.2K

1 3

IC708

TCM810MEND

D706

DIODE

SW1

SW2

SW3

SW4

Dout

Din

CLK

STB

KEY1

KEY2

KEY3

KEY4

Vdd

Seg1/KS1

Seg2/KS2

Seg3/KS3

Seg4/KS4

Seg5/KS5

Seg6/KS6

Seg7/KS7

Seg8/KS8

Seg9/KS9

Seg10/KS10

Seg11/KS11

Seg12/KS12

Seg13/Grid16 27

Seg14/Grid15 28

Seg15/Grid14 29

Seg16/Grid13 30

Seg17/Grid12 31

Seg18/Grid11 32

Vdd 33

Vee 34

Seg19/Grid10 35

Seg20/Grid9 36

Grid8 37

Grid7 38

Grid6 39

Grid5 40

Grid4 41

Grid3 42

Grid2 43

Grid1 44

Vdd 45

LED5 46

LED4 47

LED3 48

LED2 49

LED1 50

Vss 51

OSC 52

IC703

UPD16311

P10

P11

P12

P13

P14

P15

P16

P17

P18

G10

+5V

C703

0.1uF

R741

47K

P10

P11

P12

P13

P14

P15

P16

P17

P18

G10

P18

P17

P16

P15

P14

P13

P12

P11

P10

G10

IC701

HNA-10SM12

+5V-30V

CZ703

CON18

+5V

-30V

VFD1

VFD2

VFD1

R701

10K

R702

10K

R703

10K

R704

10K

R747

10K

R746

10K

R745

10K

R744

10K

Din

Dout

VFD CLK

VFD STB

Key2

Key3

Key1

Key4

Key2

Key3

Key1

Key4

+5V

STEREO

TUNER

PLL CLK1

PLL D1

PLL D0

PLL CE

RDS CLK

RDS DATA

CZ701

CON8

ENCODE 1

ENCODE 2

ENCODE 1

Din

Dout

VFD CLK

VFD STB

Key1

Key2

Key3

Key4

PCB-3: KEY BOARD FOR Vm5.0 PCB-4: VFD BOARD

KEY CONTROL CIRCUIT FOR Vm1.6 VDF DISPLAY CONTROL CIRCUIT

SCHEMATIC DIAGRAM (4/4)

- 20 -

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