Nad C-355-BEE Service Manual

NAD

SERVICE MANUAL

C 355BEE

STEREO

C 355BEE

STEREO

AMPLIFIER

AMPLIFIER

TABLE OF CONTENTS

DESCRIPTION P A G E

SERVICE CAUTION…………………………………………………………..3-4

REAR PANEL/FRONT PANEL VIEW………………………………………..5

SPECIFICATIONS…………………………………………………………6-7

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

BLOCK DIAGRAM……………………………………………………. …….9-13

ALIGNMENT PROCEDURE........................................................14

SCHEMATICS……………………………………………………………....15-18

PCB LAYOUT……………………………………………………………….19-22

TROUBLE SHOOTING GUIDE…………………......................................23

ELECTRICAL PARTS LIST…………………………………………….24-33

EXPLODED VIEW……………………………………………………………..34

EXPLODED VIEW PARTS LIST……………………………………………....35

PRODUCT SAFETY SERVICING GUIDELINES

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN
ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS
WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED
MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT
MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING
PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU
ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING
SAFETY CHECKS AND SERVICING GUIDELINES. TO DO
OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS
AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR
PROTECTION FROM AC LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN
CORRECTED. A CHECK SHOULD BE MADE OF THE
FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN
SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT
COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT
ON THOSE MODULES WHICH ARE TRANSPORTED TO AND
FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE
DEVICES SUCH AS INSULATORS, BARRIERS, COVERS,
SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND
OTHER HARDWARE HAVE BEEN REINSTALLED PER
ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE
OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE
COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP
SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE
FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR
DETERIORATION TO PARTS AND COMPONENTS. FOR
FRAYED LEADS, DAMAGED INSULATION (INCLUDING AC
CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL
LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING
TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD
TENSION AROUND PROTRUDING METAL SURFACES MUST
BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES,
FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE
REPLACED WITH EXACT FACTORY TYPES, DO NOT USE
REPLACEMENT COMPONENTS OTHER THAN THOSE
SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT
MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN
AC LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF
THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA
TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET
IS SAFET TO OPERATE WITHOUT DANGER OF ELECTRICAL
SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER
DURING THIS TEST USE AN AC VOLTMETER, HAVING 5000
OHMS PER VOLT OR MORE SENSITIVITY, IN THE
FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT
RESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPE
CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND
(WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED
METALLIC PARTS, ONE AT A TIME.
MEASURE THE AC VOLTAGE ACROSS THE COMBINATION
OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR.
REVERSE THE AC PLUG AND REPEAT AC VOLTAGE
MEASUREMENTS FOR EACH EXPOSED METALLIC PART.

VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S.
THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE
EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT : GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN
EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” WITHIN THE
PRODUCT’S ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO
CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS
INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE
LITERATURE ACCOMPANYING THE APPLIANCE.

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS,
CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER
OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED
AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS:
OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A
FACTOR, NEAR STEAM RADIATORS WHERE STEAM
LEAKAGE IS A FACTOR, ETC.

3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT
REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE
USE OF DECORATIVE SCARVES OR OTHER COVERINGS
WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A
COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY
APPROVED MOUNTING INSTRUCTIONS A PRODUCT
MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS
ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN
SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS
THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS
MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM
LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A
PRODUCT ON SLOPING SHELF OR A TILTED POSITION,
UNLESS THE PRODUCT IS PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE
ON ITS MOUNTING TO THE CART. CAUTION THE
CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART
WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP
PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR
STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS
LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC
MODEL OF TELEVISION RECEIVER OR GENERICALLY
APPROVED FOR USE WITH T.V.’S OF THE SAME OR
LARGER SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION
CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS
SPROUTING FROM A SINGLE OUTLET CAN LEAD TO
DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

3

SERVICING PRECAUTIONS

CAUTION : Before servicing the A/V 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 A/V 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 substitution or incorrect polarity installation
of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this A/V 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 A/V 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 1M-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 handling 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 reasons 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. lmmediately 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.)

4

16 14 1 2 3 4 185 6 7 8 17 9 10 12 11 15

INPUT

16. RS-232 INPUT

(TAPE MONITOR)

(2)

17. PRE OUT 1

18. ON OFF POWER (AC) SWITCH

13

1 2

4 6 8

3 11 5 7 9 10

11. SPEAKERS A & B

LED

5

SPECIFICATIONS

POWER AMPLIFIER SECTION
STEREO MODE

CONTINUOUS AVERAGE POWER 80 W (19 dBW)
OUTPUT INTO 8 OHMS OR 4 OHMS

(Min. power per channel, 20 Hz – 20 kHz,
with no more than rated distortion)

Rated Distortion 0.02%
(THD 20 Hz – 20 kHz)

Clipping power 90 W
(maximum continuous power per channel 4 and 8).

IHF dynamic headroom: at 8 ohms + 2.4 dB

at 4 ohms + 4.4 dB

IHF dynamic power
(maximum short term power per channel)

8 ohms: 160 W (20.4 dBW)
4 ohms: 220 W (22.0 dBW)
2 ohms: 270 W (23.2 dBW)

Damping factor > 100
(ref. 8 ohms 1 kHz)

Input Impedance R = 20 kohms

C = 1 nF

Input sensitivity (for rated output into 8 ohms) 950 mV

Voltage gain 29 dB

Frequency response 20 Hz – 20 kH

Signal / Noise ratio, A-weighted 100 dB ref. 1 W

THD + Noise < 0.02%
(Total Harmonic Distortion, 20 Hz – 20 kHz,
from 250 mW to rated output)

SMPTE I.M. < 0.01%
(Intermodulation Distortion, 60 Hz + 7 kHz, 4:1,
from 250 mW to rated output)

0.1 dB

119 dB ref. 50 W

IHF I.M. < 0.01%
(CCIF IM Distortion, 19 + 20 kHz at rated output)

Headphones Output Impedance 220 ohms

6

PREAMPLIFIER SECTION

LINE LEVEL INPUTS

(Disk, CD, Video, Auxiliary, Tuner, Tape 1,Tape 2)

Input impedance (R and C) 200 kohms + 100 pF

Input sensitivity (ref. rated power) 310 mV

Maximum input signal 6 V

Signal / Noise ratio, A-weighted 97.0 dB ref. 1W
(from CD Input to Speakers Output, Volume Setting
for 500mV in , 8ohms 1W out)
Signal to noise ratio preamp out, IHF “A” weighted 110 dB re 500mV

Frequency response, 20 Hz – 20 kHz < +/-0.1 dB (tone defeat on)
< +/-0.2 dB (tone defeat off)
THD + Noise, SMPTE IM < 0.01% at 5 V out

LINE LEVEL OUTPUTS

Pre-amp output impedance 80 ohms

Tape output impedance Source Z + 1kohms

Maximum output level pre-amp out : > 11 V
Tape-out : > 10 V

CONTROLS

Treble +/- 5 dB at 10 kHz

Bass +/- 8 dB at 100 Hz

IR IN and OUT

Input Resistance > 10 kohms

Input Voltage Min 5 V

Output Resistance < 30 ohms

TRIGGER Out

Output Current 50 mA

Output Voltage 12 V

DIMENSIONS AND WEIGHTS

Net Weight 6.5 kg ( 14.3 Ib)

Shipping Weight 8 kg ( 17.6 Ib)

DIMENSION (W×H×D) 435× 116 × 292MM

7

REMROFSNART

BOARDHEADPHONE

MARGAID GNIRIW

62#GWA 8642LU

DRAOB 232SR

87BC

62#GWA 8642LU

54ZC

AC POWER PLUG

POWER SWITCH

53BC

62#GWA 8642LU

CB45

74BC

DRAOB NIAM

87ZC

67ZC

17ZC

57ZC

UL2468 AWG#26

01-35502-00

)HA(TELTUO CA

DRAOB L-DMS-PMA

12ZC

01-35504-00

16ZC

tresnI

UL1672 AWG#22

65BC

CB55

75BC

81#GWA 2761LU

15BC

UL1672 AWG#18

95BC

CB54

CB58

UL3266 AWG#18

81#GWA 2761LU

41#GWA 2761LU

81#GWA 2761LU

DRAOB REWOP

12BC

01-35503-00

11

ZC

DRAOB R-DMS-PMA

01-35504-00

16ZC

tresnI

DRAOB DMS PMA PMAERP

tresnI

23BC

DRAOB DMS PMA PMAERP

tresnI

13BC

43BC

UL2468 AWG#26

KEY BOARD

37BC

CB52

62#GWA 8642LU

11BC

35BC

62#GWA 8642LU

33BC

37ZC

DRAOB YBDNATS

8

MARGAID KCOLB

DB9

RS232

SP232EEP-L

RT33

VOLUME

CONTROL

VOLUME CONTROL

CIRCUIT (REMOTE)

VOL-

VOL+

MCU

AT89S52

CIRCUIT

(BY RELAYS)

INPUT SELECTION

PRE-OUT2 L

PRE-OUT1 L

MUTE

TUO ˅

DMS

ELUDOM PMA MPAERP

BASS

TREBLE

RT31

RT32

RT34

˅

DMS

ELUDO

M PMA MPAERP

PRE-OUT1 R

Y

RELA

˄

BALANCE

SW31

˄ NI

PRE-OUT2 R

TONE DEFEAT

MCU

MUTE

CONTROL

CIRUIT

MIRROR

CURRENT

SCR

CIRCUIT

SOURCE

CIRCUIT

CONTROL

S41

TRIG I-V

SOFT CLIPPING

CONTROL CIRCUIT

(IC44)

MODULE

PROTECTION

ISC CIRCUIT

(IC43,TL082D)

R439

POSISTOR

R467

POSISTOR

MAIN IN R

CIRCUIT L

POWER AMP

(90 DEGREE C)

(80 DEGREE C)

MAIN IN L

CIRCUIT R

POWER AMP

MP L

MP R

DISC L

DISC R

CD L

shctiwS yaleR

CD R

VIDEO L

VIDEO R

AUX L

AUX R

TUNER L

TUNER R

TAPE1 IN L

TAPE1 IN R

TAPE1 OUT L

TAPE1 OUT R

TAPE2 IN L

TAPE2 IN R

9

TAPE2 OUT L

TAPE2 OUT R

RL12/2

F1AA012V

SPK A R

SPK A L

RL12/1

SPK B R

SPK B L

HEADPHONE

14KJ

MARGAID NOITCENNOC ROSSECORPORCIM

etuM

tiucriC

17CI

1

CN

2
3

77ZC

5

1

9

2

4

3

8

4

01

11

3

5

7

6

2

7

6

8

1

9 BD

ccV

CN

CN

CN

LCS

ssV4ADS

10C42

teseR

tiucriC

67CI

+1C

CCV

+V

DNG

-1C

TUO1T

+2C

NI1R

-2C

TUO1R

-V

NI1T

TUO2T

NI2T

NI2R

TUO2R

L-PEE232PS

TUO RI

TIUCRIC

V5+

27CI

3

1

2

L06U1SI

NI RI

TIUCRIC

V5+
8
7
6
5

37CI

1

0.1P

2
61
51
41
31
21
11
01

9

01567R

807R

01

B/A rekaepS

tiucriC lortnoC

17Y

zHM2950.11

97C

p72

017C

p72

1.1P

3

2.1P

4

3.1P

5

4.1P

6

5.1P

7

6.1P

8

7.1P

9

TSR

01

11

21

31

41

4.3P/0T

51

5.3P/1T

61

71

81

91

02

6.3P/RW

7.3P/DR
2LATX
1LATX

SSV

25S98TA

0.3P/DXR

1.3P/DXT

2.3P/0TNI

3.3P/1TNI

V5+

04

DDV

93

0DA/0.0P

83

1DA/1.0P

73

2DA/2.0P

63

3DA/3.0P

53

4DA/4.0P

43

5DA/5.0P

33

6DA/6.0P

23

7DA/7.0P

13

AE

03

ELA

92

NESP

82

51A/7.2P

72

41A/6.2P

62

31A/5.2P

52

21A/4.2P

42

11A/3.2P

32

01A/2.2P

22

9A/1.2P

12

8A/0.2P

emuloV
tiucriC

17ENOHP

NI dopI

noitceles tupnI

ybdnatS dnA

tiucriC lortnoC

noitceles tupnI

syeK

ylppuS rewoP V81enil lortnoc ybdnaS

tiucriC lortnoC

10

AT89S52
KEY BOARD IC73

V

CC

GND

B

REGISTER

RAM ADDR.

REGISTER

P0.0 - P0.7

PORT 0 DRIVERS

RAM

ACC

TMP2 TMP1

PORT 0

LATCH

PORT 2 DRIVERS

PORT 2

LATCH

POINTER

P2.0 - P2.7

FLASH

STACK

PROGRAM

ADDRESS

REGISTER

BUFFER

PSEN

ALE/PROG

EA / V

RST

PC

ALU

INTERRUPT, SERIAL PORT,

AND TIMER BLOCKS

PSW

TIMING

AND

PP

CONTROL

OSC

INSTRUCTION

REGISTER

WATCH

DOG

PORT 3

LATCH

PORT 3 DRIVERS

P3.0 - P3.7

PORT 1

LATCH

PORT 1 DRIVERS

P1.0 - P1.7

ISP

PORT

INCREMENTER

PROGRAM

COUNTER

DUAL DPTR

PROGRAM

LOGIC

11

PEE232PS

67CI :DRAOBYEK

1

+1C

Fu1.0

3

-1C

1

2

+V

3

-1C

61+1C

CCV

51

DNG

41

TUO1T

4

+2C

Fu1.0

5

-2C

TUPNI V5+

Fu01

61

CCV

2

V01+ ot V5+

relbuoD egatloV

V01- ot V01+

retrevnI egatloV

+V

Fu1.0

6

-V

fu1.0

4

+2C

5

-2C

6

-V

7

TUO2T

31

NI1R

11

21

TUO1R

11

NI1T

01

NI2T

98

TUO2RNI2R

NI1T

01

NI2T

21 31

TUO1R

TUO2R NI2R

smhoK004

smhoK004

1T

2T

1R

smhoK5

2R

smhoK5

51DNG

41

7

89

TUO1T

TUO2T

NI1R

12