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C 445 SERVICE MANUAL
CFM / AM
DAB TUNER
C 445
FM / AM
DAB TUNER
NAD
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.
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SPECIFICATIONS
FM SECTION
Frequency Range: 87.50 MHz to 108.00 MHz
(50 kHz steps)
Signal-to-Noise Ratio: 65dB (Mono) 60dB (Stereo)
Presets: 30
AM SECTION
Frequency Range: 522 kHz to 1620 kHz (9 kHz steps)
Signal-to-Noise Ratio: 35dB
Presets: 30
DAB SECTION
Band lll: 174MHz - 240MHz
Band L : 1452MHz - 1492MHz
Max signal: ~ -3dBm
Sensitivity: ~ -96dBm
Adjacent Channel Rejection: ~ 35dB
Presets: 99
Display: 2-line by 16-character DOT Matrix
Audio Output Stereo: 2.5V P-P
48kHz sample rate, 16 bit sample resolution
Optical S/PDIF: IEC60958 Compliant.
48kHz sample rate, 24 bit sample resolution
GENERAL
Power Requirement: 230-240V AC, 50Hz
Power Consumption: 12W 0.8W(standby)
DIMENSIONS (MAX)
Width Height Depth: 435 x 86 x 318mm
Weight: 6kg
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TROUBLESHOOTING
This unit is designed for trouble-free operation. Most problems users encounter are due to operating errors. If you have a problem, first check this list
for a possible solution. If the problem persists, consult your authorized Service Centre.
Symptom Cause/Correction
No lights appear when System Power button is pressed Unit is plugged into a live outlet.
Make sure the outlet is active.
No sound is heard Tune to an active station.
Check for correct amplifier settings.
Check the connections and wires.
Sound distorts, particularly in stereo mode. Use a more directional antenna.
Intermittent or continuous buzzing or hissing Place the unit further away from these appliances.
Install noise filters on the appliances.
Display says 'No stations Available' Check that antenna is connected.
Ensure that DAB coverage exists in your area.
Display has gone blank or says 'service off air' This may occur if a broadcaster changes the label of a service or removes a label
whilst you are listening to it. Try to retune to this station, using the Autotune
procedure.
Unit's operation or the displays seem abnormal To correct this problem, first unplug the unit from the AC wall outlet and wait at
least three minutes. After the pause, reconnect the AC power cord and check the
unit's operation.
Reset the C445 Tuner; press and hold the Menu/FM Mute Button for 5 seconds,
until the Information Display shows FACTORY RESET. Note that when the system
is reset, all tuner presets will be lost and must be re-entered.
Press the RESET switch lightly once or twice with a pencil or ballpoint pen as per
example below.
If these steps do not solve the problem, consult your dealer or an authorized
service centre.
Rear Panel
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MAINTENANCE FLOW CHART
Start
Power on
Voltages NO 1. Check Cable
at pins of connector 2. Replace Power Supply unit if Power Board is not shorted,
(CN93) are normal? otherwise find out first where the short is.
YES
NO NO Check CNVMB114MA18L
Are FM/AM Is Power Supply (Tuner Module)
MAIN Board normal? normal? and peripheral circuit.
(CUP11866Y)
YES
NO
Is PLL Check S3F84BB
Clock normal? and peripheral circuit.
YES YES
Chcek TUNER module connection Antenna.
Power Board
(CUP11866Y)
NO NO Check DAB Module
Is DAB Is Power Supply and peripheral
normal? normal? circuit.
YES
NO Check 74ACT04(IC73) or
Is Voltage level 74LVC04(IC74) and
normal? peripheral circuit.
MAIN Board YES
(CUP11866Y)
YES NO Check S3F84BB or DAB
Are Clock and Module and peripheral
Data normal? Circuit.
YES
Check DAB Module connection Antenna.
Normal Operation
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WIRING DIAGRAM
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FP2 Relay (RT21)
Terminal assignment
Relay - top view
Non-latching type, Latching type, latching, 2 coils
not energized condition reset condition reset condition
BLOCK DIAGRAM (IC22, IC23, IC24: OP AMP)
OPA2134
Out A 1 8 V+
A