Text preview for : C-356BEE.pdf part of NAD C-356BEE NAD C C-356BEE C-356BEE.pdf
Back to : C-356BEE.pdf | Home
C 356BEE SERVICE MANUAL
STEREO
AMPLIFIER
NAD
STEREO
AMPLIFIER
C 356BEE
TABLE OF CONTENTS
DESCRIPTION PAGE
SERVICE CAUTION....................................................................3-4
REAR PANEL/FRONT PANEL VIEW............................................5-6
SPECIFICATIONS..................................................................7-8
WIRING DIAGRAM........................................................................9
BLOCK DIAGRAM............................................................. ......10-13
ALIGNMENT PROCEDURE........................................................14
SCHEMATICS.........................................................................15-18
PCB LAYOUT.........................................................................19-24
TROUBLE SHOOTING GUIDE...........................................................25
ELECTRICAL PARTS LIST....................................................26-36
EXPLODED VIEW.......................................................................37
EXPLODED VIEW PARTS LIST.......................................................38
PRODUCT SAFETY SERVICING GUIDELINES
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S.
ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE
WITHOUT MANUFACTURER'S APPROVAL. UNAUTHORIZED EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL
MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.
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 SUBJECT : GRAPHIC SYMBOLS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN
THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN
CORRECTED. A CHECK SHOULD BE MADE OF THE EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE
FOLLOWING. PRESENCE OF UNINSULATED "DANGEROUS VOLTAGE" WITHIN THE
PRODUCT'S ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO
SUBJECT : FIRE & SHOCK HAZARD CONSTITUTE A RISK OF ELECTRIC SHOCK.
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS
SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE
COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT LITERATURE ACCOMPANYING THE APPLIANCE.
ON THOSE MODULES WHICH ARE TRANSPORTED TO AND
FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE SUBJECT : TIPS ON PROPER INSTALLATION
DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS,
SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER
OTHER HARDWARE HAVE BEEN REINSTALLED PER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED
ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE AIR FLOW.
OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS:
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A
COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP FACTOR, NEAR STEAM RADIATORS WHERE STEAM
SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE LEAKAGE IS A FACTOR, ETC.
FOREIGN PARTICLES. 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE
DETERIORATION TO PARTS AND COMPONENTS. FOR USE OF DECORATIVE SCARVES OR OTHER COVERINGS
FRAYED LEADS, DAMAGED INSULATION (INCLUDING AC WHICH MIGHT OBSTRUCT VENTILATION.
CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A
LAYOUT, LEAD LENGTH AND DRESS. COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING APPROVED MOUNTING INSTRUCTIONS A PRODUCT
TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS
TENSION AROUND PROTRUDING METAL SURFACES MUST ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN
BE AVOIDED. SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS
FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM
REPLACED WITH EXACT FACTORY TYPES, DO NOT USE LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.
REPLACEMENT COMPONENTS OTHER THAN THOSE 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A
SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT PRODUCT ON SLOPING SHELF OR A TILTED POSITION,
MODIFICATIONS. UNLESS THE PRODUCT IS PROPERLY SECURED.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE
AC LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF ON ITS MOUNTING TO THE CART. CAUTION THE
THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART
TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP
IS SAFET TO OPERATE WITHOUT DANGER OF ELECTRICAL PILE CARPETS.
SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR
DURING THIS TEST USE AN AC VOLTMETER, HAVING 5000 STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS
OHMS PER VOLT OR MORE SENSITIVITY, IN THE LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC
FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT MODEL OF TELEVISION RECEIVER OR GENERICALLY
RESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPE APPROVED FOR USE WITH T.V.'S OF THE SAME OR
CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND LARGER SCREEN SIZE.
(WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION
METALLIC PARTS, ONE AT A TIME. CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS
MEASURE THE AC VOLTAGE ACROSS THE COMBINATION SPROUTING FROM A SINGLE OUTLET CAN LEAD TO
OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. DISASTROUS CONSEQUENCES TO HOME AND FAMILY.
REVERSE THE AC PLUG AND REPEAT AC VOLTAGE
MEASUREMENTS FOR EACH EXPOSED METALLIC PART.
3
SERVICING PRECAUTIONS
CAUTION : Before servicing the A/V Receiver covered by this Electrostatically Sensitive (ES) Devices
service data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged easily by
SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances static electricity. Such components commonly are called
create conflict between the following servicing precautions and any Electrostatically Sensitive (ES) Devices. Examples of typical Es
of the safety precautions in this publication, always follow the safety devices are integrated circuits and some field effect transistors and
precautions. semiconductor chip components.
Remember Safety First: The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
General Servicing Precautions
1. Always unplug the A/V Receiver AC power cord from the AC 1. Immediately before handling any semiconductor component or
power source before: semiconductor-equipped assembly, drain off any electrostatic
(1) Removing or reinstalling any component, circuit board, charge on your body by touching a known earth ground.
module, or any other assembly. Alternatively, obtain and wear a commercially available
(2) Disconnecting or reconnecting any internal electrical plug or discharging wrist strap device, which should be removed for
other electrical connection. potential shock reasons prior to applying power to the unit under
(3) Connecting a test substitute in parallel with an electrolytic test.
capacitor.
Caution : A wrong part substitution or incorrect polarity installation 2. After removing an electrical assembly equipped with ES devices,
of electrolytic capacitors may result in an explosion hazard. place the assembly on a conductive surface such as aluminum
foil, to prevent electrostatic charge buildup or exposure of the
2. Do not spray chemicals on or near this A/V Receiver or any of its assembly.
assemblies.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
3. Unless specified otherwise in this service data, clean electrical devices.
contacts by applying an appropriate contact cleaning solution to
the contacts with a pipe cleaner, cottontipped swab, or 4. Use only an antistatic solder removal device. Some solder
comparable soft applicator. removal devices not classified a "anti-static" can generate
Unless specified otherwise in this service data, lubrication of electrical charges sufficient to damage ES devices.
contacts is not required.
5. Do not use freonpropelled chemicals. These can generate
4. Do not defeat any plug/socket B+ voltage interlocks with which electrical charge sufficient to damage ES devices.
instruments covered by this service manual might be equipped.
6. Do not remove a replacement ES device from its protective
5. Do not apply AC power to this A/V Receiver and/or any of its package until immediately before you are ready to install it. (Most
electrical assemblies unless all solid-state device heat sinks are replacement ES devices are packaged with leads electrically
correctly installed. shorted together by conductive foam, aluminum foil, or
comparable conductive material).
6. Always connect test instrument ground lead to the appropriate
ground before connecting the test instrument positive lead. Always 7. lmmediately before removing the protective material from the
remove the test instrument ground lead last. leads of a replacement ES device, touch the protective material to
the chassis or circuit assembly into which the device will be
Insulation Checking Procedure installed.
Disconnect the attachment plug from the AC outlet and turn the
power on. Connect an insulation resistance meter(500V) to the Caution : Be sure no power is applied to the chassis or circuit, and
blades of the attachment plug. The insulation resistance between observe all other safety precautions.
each blade of the attachment plug and accessible conductive parts
(Note 1) should be more than 1M-ohm. 8. Minimize bodily motions when handing unpackaged replacement
Note 1 : Accessible Conductive Parts including Metal panels, Input ES devices. (Normally harmless motion such as the brushing
terminals, Earphone jacks, etc. 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
5
6
7
8
WIRING DIAGRAM
TO PC RS232 PORT
TO MDC/PP375/DAC MODULE
CZ77
RS232 BOARD
UL2547#26AWG
CZ45 CZ78
CZ79
CB22 CB12
CB45
CB35
FPC-1.25-12P
PHONE BOARD
CB36
CB39 CB48
CB31
CB47
PREAMP SMD BOARD
TO AC OUTLET
TO POWER SWITCH
UL1007#26AWG
(ONLY 120V VERSION)
CZ62
UL1672#18AWG
AMP SMD BOARD
UL1672#18AWG
UL2547#24AWG
UL2854#26AWG
INSERT
(+55VA)
(-55VA)
CZ11 CB32 CB34
TO AC INLET
CB59 CB57
INSERT
CB78
UL1672#18AWG
(-55V)
WHITE
CB55
CB56 UL1672#18AWG
CB21
MAIN BOARD
(+55V)
CZ75
RED
CZ22
CB54
CB33
POWER BOARD UL1672#14AWG
INSERT
UL2468#26AWG
CZ61
UL2468#26AWG
CB58 GND
CB53
PREAMP SMD BOARD
AMP SMD BOARD
UL1672#18AWG
TO MAIN TRANSFORMER
UL1672#22AWG CZ13
CB52
KEY BOARD
(GND)
INSERT
CB37
UL1672 AWG#18 CZ12
(+55V)
UL3266#18AWG
RED
P-GND
UL1015#22AWG
CB11
UL1015#16AWG FPC-1.25-13P
(-55V)
WHITE
P-GND
CZ37
TONE+VOLUME BOARD
CB510 CB51
CZ71
CZ76
9
RT33
RS232 INTERFACE INPUT SELECT KEYS
DB9 SOCKET
(MAX232D)
CONTROL CIRCUIT
IR IN/OUT
MCU VOLUME CONTROL
INPUT SELECT CIRCUIT
STC12C5A08S2 (REMOTE)
+5V
+5V
MDC/PP375/DAC/DISC IN
+5V
Rear/Front panel MP IN
CD IN
RT31 BASS
RT32 TREBLE
TUNER IN
PREAMP IN MODULE RT34 BALANCE PREAMP OUT MODULE PREAMP OUT 1/2
RL311
TONE DEFEAT
(CONTROL BY MCU)
AUX IN
+/-12V
+/-18V
+5V
+/-18V
RELAYS SWITCH
TAPE1 IN
TAPE2 IN
10
SOFTCLIPPING
ISC CONTROL CIRCUIT PROTECT CIRCUIT POWER AMP MODULES L/R
CONTROL CIRCUIT
BLOCK DIAGRAM
REC1
REC2
+/-55V
+/-55V,+/-18V
+12V
POWER AMP CIRCUIT L/R
SPEAKERS OUT RELAYS FOR SPEAKERS OUT
+26V
+/-55V,+/-18V
HEADPHONE OUT
POWER SUPPLY
(+/-55V,+/-26V,+/-18V,+12V,+5V)
12 TRIGGER OUT
MICROPROCESSOR CONNECTION DIAGRAM
To MDC TXD Protection detect
To MDC RXD
IC76
MAX232D PHONE71
1 16 +5V
C1+ VCC Volume control
2 15
V+ GND circuit
3 14
C1- T1OUT
CZ77 4 13 Front panel MP detect
44
43
42
41
40
39
38
37
36
35
34
C2+ R1IN
1 5 12
C2- R1OUT
6 6 11 Ipod IN
V- T1IN
11 2 TXD 7 10
P1.4/ADC4
P1.2/RXD2
P1.1/ADC1
P0.0/AD0
P0.1/AD1
P0.2/AD2
P0.3/AD3
P1.0/ADC0/CLKOUT2
P1.3/TXD2
P4.2/CCP0/RXD2/MISO
VCC
T2OUT T2IN
7 RXD 8 9
R2IN R2OUT
10 3
8
4 1 33
P1.5/MOSI/ADC5 P0.4/AD4
9 To pre mute circuit 2 32 Standby control circuit
P1.6/MISO/ADC6 P0.5/AD5
5 Module Detect 3 31
P1.7/SCLK/ADC7 P0.6/AD6
+5V 4 30
DB 9 Reset circuit P4.7/RST P0.7/AD7
5 29
P3.0/RXD P4.6/RST2/EX_LVD
6 28
P4.3/CCP1/TXD2/SCLK P4.1/ECI/MOSI
IC72 3 7 27
IR RECEIVER P3.1/TXD P4.5/ALE
8 26
IS1U60L 21 9
P3.2/INT0 P4.4/NA
25
P3.3/INT1 P2.7/A15
10 24
P3.4/T0/CLKOUT0 P2.6/A14
11 23
P3.5/T1/CLKOUT1 P2.5/A13
P2.2/A10
P2.3/A11
P2.4/A12
P3.6/WR
P3.7/RD
P2.0/A8
P2.1/A9
P4.0/SS
XTAL2
XTAL1
GND
IC73
STC12C5A08S2-35I-LQFP44
Blue LED control
Input control
12
13
14
15
16
17
18
19
20
21
22
Power LED
control circuit Red LED control keys circuit
Red Amber 3LED Blue
D717
SPK A/B control circuit
Y71
Input select control circuit
11.0592MHz
Tune defeat on/off control circuit
C79 C710
27p 27p
11
STC12C5A08S2
KEY BOARD IC73
P0.0 - P0.7 P2.0 - P2.7
VCC
PORT 0 DRIVERS PORT 2 DRIVERS
GND
RAM ADDR. PORT 0 PORT 2
REGISTER RAM LATCH LATCH FLASH
PROGRAM
B STACK ADDRESS
REGISTER ACC POINTER REGISTER
BUFFER
TMP2 TMP1
PC
ALU INCREMENTER
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PROGRAM
PSW COUNTER
PSEN
ALE/PROG TIMING INSTRUCTION
AND REGISTER DUAL DPTR
EA / VPP CONTROL
RST
WATCH PORT 3 PORT 1 ISP PROGRAM
DOG LATCH LATCH PORT LOGIC
OSC
PORT 3 DRIVERS PORT 1 DRIVERS
P3.0 - P3.7 P1.0 - P1.7
12
MAX232D
KEYBOARD: IC76 +5V INPUT
10uF
16
1 VCC
C1+
V+ 2
+5V to +10V
0.1uF 0.1uF
3 C1-
Voltage Doubler
C1+ 1 16 VCC 4 C2+
V- 6
+1 0 V t o - 1 0 V
V+ 2 15 GND 0.1uF 0.1uf
5 C2-
Voltage Inverter
C1- 3 14 T1OUT
C2+ 4 13 R1IN
400Kohms
T1IN 11 T1 14 T1OUT
C2- 5 12 R1OUT
V- 6 11 T1IN 400Kohms
T2IN 10 7 T2OUT
T2
T2OUT 7 10 T2IN
R2IN 8 9 R2OUT R1OUT 12 R1 13 R1IN
5Kohms
R2OUT 9 R2 8 R2IN
5Kohms
GND 15
13
ALIGNMENT PROCEDURES
I. INITIAL
A. LOWEST VOLUME ADJUSTMENT
1. Tune the volume pot to lowest state.
2. Input a high voltage signal such as 5V from CD input.
3. Connect a oscilloscope to L channel binding posts.
4. Observing the oscilloscope,adjust VR301,make the output of speakers become to the
lowest level.
5. Adjusting VR302,make R channel output become to the lowest level by same way.
B. IDLING CURRENT
1. Power on
2. Running 5 minutes with no signal
3. Connect a DC voltmeter toTP1 and TP2 ,adjust VR22/VR23 for 6mV reading on voltmeter.
4. Connect a DC voltmeter toTP3 and TP4 ,adjust VR12/VR13 for 6mV reading on voltmeter.
C.ISC CIRCUIT ORIGINAL ADJUSTING
Adjust the pot VR3 to make the DC voltage of the point of TP10 to the same as TP11
II. FINAL ADJUSTMENT
Repeat procedure A,B and C for the lowest volume level, idling current alignment
and ISC original level respectively.
C356BEE MAIN BOARD
TP10 TP11
VR3
TP2
VR301 VR302
VR22
TP1 VR23
TP3
VR13
VR12
VR304 VR303
TP4
C356BEE TUNE +VOLUME BOARD
14
SCHEMATICS DIAGRAM(1/4)
POWER SUPPLY CIRCUIT Vm1.0
PCB-2:POWER BOARD Vm1.0
NAD C356BEE POWER CIR.
R562
1K R561
R563
R531 100 22K
0.05/5W 5% CE Q517
A1015
R532 D531 R558 CB55 CZ55 AC POWER CORD
A1015 220 1K
Q510 BT151-500R 3 3
2 2 !
1 1
Q59 CON3
A1015
! !
C517
22000uF/63V 10%
R533 R567 R534 C52 C51
10n/250V 10n/250V
4.7nF/400V
1M 330K 2K2 10% 10%
C518
C53
D55 D51
22000uF/63V 10% CB56 CZ56
CB54 KBU8D KBU8D
3 1
RED 2 +55V SW52
-55V