NAD C-165-BEE Service manual

NAD

SERVICE MANUAL

C 165BEE

STEREO

C 165BEE

STEREO

PREAMPLIFIER

PREAMPLIFIER

TABLE OF CONTENTS

DESCRIPTION P A G E

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

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

SPECIFICATIONS…………………………………………… ……… … …6

WIRING DIAGRAM………………………………………………………………7

BLOCK DIAGRAM……………………………………………………. …….8-12

ALIGNMENT PROCEDURE........................................................13

SCHEMATICS……………………………………………………………....14-16

PCB LAYOUT……………………………………………………………….17-20

TROUBLE SHOOTING GUIDE…………………......................................21

ELECTRICAL PARTS LIST…………………………………………….22-34

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

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

C725BEE PACKING ACCESSORY AND PARTS LIST.............................37



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
CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE
INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE
LITERATURE ACCOMPANYING THE APPLIANCE.

ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO

EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS,
CUBBYHOLE
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

WALL AND SHELF MOUNTED INSTALLATIONS USING A

4.
COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY
APPROVED MOUNTING INSTRUCTIONS A PRODUCT
MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS
ORIGINAL
SPACERS)
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
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

SMALL CASTERS ACROSS THRESHOLDS OR DEEP

WITH
PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR
STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS
LABORATORIES,
MODEL
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

ROUTING FROM A SINGLE OUTLET CAN LEAD TO

SP
DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

OR CLOSELY FITTING SHELF SPACE. OVER

.

FEET (OR THE EQUIVALENT THICKNESS IN

TO PROVIDE ADEQUATE AIR FLOW ACROSS

ON SLOPING SHELF OR A TILTED POSITION,

ON THE HAZARDS OF TRYING TO ROLL A CART

INC. FOR USE WITH THEIR SPECIFIC

OF TELEVISION RECEIVER OR GENERICALLY



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

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

power
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
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
test

2. After removing an electrical assembly equipped with ES devices,
place the assembly on a conductive surface such as aluminum
foil,
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
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
replacement
shorted together by conductive foam, aluminum foil, or
comparable conductive material).

7. lmmediately before removing the protective material from the
leads
the chassis or circuit assembly into which the device will be
installed.

Caution
observe all other safety precautions

8. Minimize bodily motions when handing unpackaged replacement
ES
together of your clothes fabric or the lifting of your foot from a
carpeted
an ES device.)

shock reasons prior to applying power to the unit under

.

to prevent electrostatic charge buildup or exposure of the

.

.

devices not classified a “anti-static” can generate

until immediately before you are ready to install it. (Most

ES devices are packaged with leads electrically

of a replacement ES device, touch the protective material to

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

devices. (Normally harmless motion such as the brushing

floor can generate static electricity sufficient to damage

assembly, drain off any electrostatic

.

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OVERALL SPECIFICATIONS

LINE LEVEL INPUT

Input impedance (R and C) 100 kΩ+ 320 pF
Input sensitivity 158 mV (ref. 500 mV out)
Maximum input signal >9 V
Signal/Noise ratio, A-weighted >108 dB (ref. 500 mV in 500 mV out, volume set to unity gain)
>106 dB (ref. 2V out, Volume maximum)
Channel Separation >80 dB (ref. 1 kHz/10 kHz)
Frequency response ± 0.1 dB (ref. 20 Hz - 20 kHz, Tone defeat ON)
± 0.5 dB (ref. 20 Hz - 20 kHz, Tone defeat OFF)
Frequency response (subwoofer out) 100 Hz (ref. -3 dB)

OUTPUT

Output impedance - Pre out 75 Ω
Tape out Source Z + 440 Ω
Sub out 100 Ω
Headphones 10 Ω
Maximum output level - Pre out >10 V into 600 Ω
Tape out >10 V into 10 kΩ load
Sub out >7 V into 1 kΩ load
Headphones >5 V into 600 Ω
>2 V into 32 Ω
THD (CCIF IMD, DIM 100) >0.001 % dB (ref. 20 Hz – 20 kHz, 2 Vout)

TONE CONTROLS

Treble ± 5 dB at 10 kHz (ref. 2V in 500 mV out)
Bass ± 5 dB at 100 Hz (ref. 2V in 500 mV out)

POWER CONSUMPTION

Normal operation 21 W
Standby mode <0.8 W

PHONO INPUT

Input impedance - MC 40,100,600 Ω (R)
1 nF (C)
MM 47 kΩ (R)
220,300,400 pF (C)
Input sensitivity - MC 0.15 mV (ref. 1 kHz 500 mV out)
MM 2.63 mV (ref. 1 kHz 500 mV out)
Input overload - MC 1 mV/10 mV/100 mV (20 Hz/1 kHz/20 kHz)
MM 16 mV/147 mV/1.4 (20 Hz/1 kHz/20 kHz)
Gain - MC in - Tape out 59.8 dB1 (ref. 1 kHz, 10 kΩ load)
MM in - Tape out 36.5 dB (ref. 1 kHz, 10 kΩ load)
THD (CCIF IMD, DIM 100) <0.009 % (ref. 20 Hz – 20 kHz, 5 Vrms Tape out)
Signal/Noise ratio, IHF A-weighted - MC >78 dB2 (ref. 0.5 mV)
MM >86 dB3 (ref. 0.5 mV)
RIAA response accuracy ± 0.5 dB (ref. 20 Hz – 50 Hz)
± 0.3 dB (ref. 50 Hz – 20 kHz)
Infrasonic lter 10 Hz (at -3 dB)
5 Hz (at -14 dB)
Channel Separation - MC >60 dB (ref. 1 kHz/10 kHz)
MM >60 dB (ref. 1 kHz/10 kHz)

DIMENSION AND WEIGHT

Dimensions (W x H x D) 435 x 80 x 286 mm (Net)
435 x 99 x 315 mm (Gross
Net weight 6 kg
Shipping weight 7.8 kg



120V VERSION ONLY

WIRING DIAGRAM

CZ107

PHONO SWITCH

UL1672#18AWG

CB54

UL1672#18AWG

CB57

TO SWITCHED AC OUTLET

CZ58

CB52

UL1672#18AWG

UL1672#18AWG

CB55

TO AC INLET

CB56

CZ109

CB53

UL2468#26AWG

CB104

CB102

HEADPHONE Vm1.0

C165BEE PHONE AMP Vm1.0

CZ108

INSERT

CB108

UL2468#26AWG

LINE MODULE

M303

INSERT

CZ113

LINE MODULE

M302

INSERT

CZ115

MM MODULE

CZ117

MM INPUT Vm1.0

M301

INSERT

MC INPUT L

Vm1.0

UL2468#26AWG

INSERT

CB107

INSERT

CB111

CB110

INSERT

CZ111

MC INPUT R

Vm1.0

CB109

CZ110

UL3266 AWG#22

UL3266 AWG#18

CB103

UL1672 AWG#22

C165 BEE MAINBOARD

LINE MODULE

M403

INSERT

CZ114

LINE MODULE

M402

INSERT

CZ116

MM MODULE

M401

INSERT

CZ118

NAD C165 TRANSFORMER

HEADPHONE Vm1.0

CZ102

CB101

FPC2.5-19 S=1.25mm

CZ701

NAD C165 KEY BOARD Vm1.0
COPYRIGHT C 2008 NAD ELECTRONICS

CB106

P101

NAD C165BEE T ONE BOARD Vm1.0
COPYRIGHT C 2008 NAD ELECTRON ICS

UL2468#26AWG

CZ106

CB105

UL1015#16AWG

UL2468#26AWG

P100

CZ105

NAD C165BEE POT BOARD Vm1.0

COPYRIGHT C 2008 NAD ELE CTRONICS



BLOCK DIAGRAM

MCU

IC73

KEY

STANDBY

TONE DEFEAT

KEYBOARD SECTION

LED

CD

TUNER

DISC

AUX

TAPE

MP

REC OUT

PHONO IN

SUBOUT

PREOUT

HP OUT

OUTPUT

MM
INPUT

SW1

MC
INPUT

2SK363

RELAYRELAY

INPUT RELAY

RELAY

Q109

RL110 RL109

PHONE AMP
MODULE

M403

LINE
MODULE

M302
M402

RIAA
CIRCUIT

INPUT RES
SELECTOR

S101

RV14

BALANCE

TONE
DEFEAT

RL111

TONE
CONTROL

RV11&RV12

MM INPUT CAP
MODULE

M301 S102
M401

MC AMP
CIRCUIT

TRANSFORMER

VOLUME
CONTROL

RV13

SELECTOR

LINE
MODULE

M303
M403

POWERBOARD SECTION

SWITCHING POWER

+5.5V

MAINBOARD SECTION

+5.5V

LINEAR



MCU CONNECTION DIAGRAM

J202

CZ701

19
18
17
16
15
14
13
12
11
10

CON19

IS1U60L
IC703

9
8
7
6
5
4
3
2
1

V
S
G

+5.5V

HEADPHONE DET

PHONE MUTE
TONE D
TP1
TP2
AU
M
TU
C
PHO

1 2
3 4
5 6
7 8
9 10

ISP

1
2
3

IC71

NC
NC
NC
Vss4SDA

24C01

SCL

Vcc
NC

+5.5V

8
7
6
5

Y71

11.0592MHz

KEY

AT89S52-TQFP
IC73

1

P1.5(MOSI)

2

P1.6(MISO)

3

P1.7(SCK)

4

RST

5

P3.0(RXD)

6

NC

7

P3.1(TXD)

8

P3.2(INT0)

9

P3.3(INT1)

10

P3.4(T0)

11

P3.5(T1)

44

41

38

37

40

39

NC

P1.242P1.343P1.4

VCC

P1.0(T2)

P1.1(T2 EX)

P3.6(WR)12P3.7(RD)13XTAL214XTAL115GND16GND17P2.0(A8)18P2.1(A9)19P2.2(A10)20P2.3(A11)21P2.4(A12)

P0.3(AD3)34P0.2(AD2)35P0.1(AD1)36P0.0(AD0)

P0.4(AD4)
P0.5(AD5)
P0.6(AD6)
P0.7(AD7)

EA/VPP

ALE/PROG

PSEN
P2.7(A15)
P2.6(A14)
P2.5(A13)

22

+5.5V

33
32
31
30
29
28

NC

27
26
25
24
23

TO LED
AND CONTROL SIGNAL
TO MAINBOARD

1

1

RED

3

AMBER

4

BLUE

D707

3LED

2

3

2

4



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

RUPT, SERIAL PORT,

INTER

AND TIMER BLOCKS

PSW

TIMING

AND

PP

CONTROL

OSC

INST

RUCTION

REGISTER

WATCH

DOG

PORT 3

LATCH

PORT 3 DRIVERS

P3.0 - P3.7

PORT 1

LATCH

RT 1 DRIVERS

PO

P1.0 - P1.7

ISP

PORT

INCREMENTER

PROGRAM

COUNTER

DUAL DPTR

PROGRAM

LOGIC



24C01

KEY BOARD IC71

PIN CONFIGURATION

FUNCTIONAL BLOCK DIAGRAM

8

Vcc

5

SDA

6

SCL

7

WP

SLAVE ADDRESS

REGISTER &

COMPARATOR

1

NC

2

NC

3

NC

4 5

VSS

CONTROL

LOGIC

8

VCC

7

NC

6

SCL

SDA

HIGH VOLTAGE

GENERATOR,

TIMING & CONTROL

REDOC

X

E
D

EEPROM

ARRAY

GND

WORD ADDRESS

COUNTER

Y

DECODER

4

ACK

nMOS

Clock

DI/O

DATA

>

REGISTER



TNY274
POWERBOARD:IC51

PIN CONNECTION :

BLOCK DIAGRAM:

