NAD C660 User manual

MODEL : C660
SERVICE MANUAL
NAD
SERVICE MANUAL C660
C660
C660
SERVICE MANUAL
AUDIO CD RECORDER
AUDIO CD RECORDER
AUDIO CD RECORDER
NAD ELECTRONICS INTERNATIONAL
TORONTO
NAD 2001
NAD

-2-
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 2
SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . 3
ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . 5
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . 6
OVERALL WIRING DIAGRAM . . . . . . . . . . . . . . 29
BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . 31
CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . 34
PRINTED CIRCUIT BOARD DIAGRAMS . . . . . . . 41
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . 47
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . 50
SPECIFICATIONS
Signal Format
Playback Sampling Frequency 44.1 kHz
D/A Conversion 96kHz, Multi-Bit Delta-Sigma Conversion
Oversampling 128 Times
Playback Specifications
Frequency Response 2Hz – 20,050Hz
Playback S/N 100dB
Playback Dynamic Range 95dB
Playback THD 0.005% / –88dB
Analog Audio Output 2V RMS, ± 2dB (1KHz 0dB)
Digital-Coaxial Output 0.5 Vpp/75Ω
Headphone Output 0.5V RMS/32ΩLoad (1KHz 0dB)
Record Specifications
Digital Dubbing Mode (X1/X2/X4) Equal to source
Digital Input Sample Rate 32kHz ~ 96kHz
Signal/Noise Ratio - Analog 84dB
Signal/Noise Ratio - External (Sourse) source-10dB
Dynamic Range 87dB
THD 0.005%/-85dB
Analog Input Sensitivity 300 mV RMS 47kΩ= 0dB
Digital Inputs (Direct Recording) 44.1kHz, ± 100 ppm/min.
General
Power Requirement 100~240V AC, 50/60Hz
Power Consumption 28 Watts
Dimensions
Width 17.3"/440mm
Height 4.4"/112mm
Depth 13.9"/354mm
Weight 14.3 lb/6.5 kg

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SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction
and/or damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation
screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
5) Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used
for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-
ton swab should be used, taking care not to distort this.
6) Never attempt to disassemble the pick-up.
Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do
not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of
this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.
Storage in conductive bag
NEVER look directly at the laser beam, and don’t let contact
fingers or other exposed skin.
Magnet
How to hold the pick-up
Conductive Sheet
Cotton swab
Pressure
Pressure
Drop impact

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NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These compo-
nents are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage,
components can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must
be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong
magnetism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.
5) Workers should be grounded by an armband (1MΩ)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Resistor
(1 Mohm) Conductive
Sheet
Resistor
(1 Mohm)
Armband

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ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components com-
monly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated cir-
cuits 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 ESD devices, place the assembly on a conductive sur-
face 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 ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static"
can generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by 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 ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen-
erate static electricity sufficient to damage an ESD device).

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TROUBLESHOOTING GUIDE
1. Initial Lead-in Operation
2. Trouble List (Circuit)
(In the Initial Lead-in Operation Mode)
A. Pick-Up doesn’t move to the inner-track.
B. Pick-Up lens doesn’t move up and down.
C. Disc doesn’t rotate.
D. The Laser (RED) of Pick-Up doesn’t light.
E. TOC isn’t read.

3. Troubleshooting Guide (In the Initial Lead-in Operation Mode)
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IC503 IC503
IC505 IC505
IC505
IC502 IC502
IC505
56 9 10
IC502
IC502
IC505 12 W 13 V 13 U?
IC502
IC502
IC505
FAO
56
4
12

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IC501
2.8
IC502,

-9-
CN401 8 PIN
(PWR_MUTE)
CN401
14, 15, 16 PIN INPUT
(LRCK, DATA, BCK)
IC706
IC706
IC706
Check the CDP part
Check the connection CN401 5 PIN
(CDP_MUTE)
PIN
Check the connection CN401
18 PIN (S_MCLK)

-10-
CN401 8 PIN = ’H’
(PWR_MUTE)
CN401
20, 21, 22 PIN Input
(R_LRCK, R_DATA, R_CLK)
is normal
IC704
IC704
IC704
Check the connector CN401
24 PIN (MCLK)
Check the CDRW part
Check the CDP part
Check the connection CN401 10PIN
(CDR_MUTE)
PIN
NO AUDIO (CDR JACK)

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TROUBLESHOOTING GUIDE FOR CD-RW BOARD
Reset or Power Check.
•Is the Pin 1, 3 of PN403 5V?
•Is the Pin 5 of PN403 12V?
Does the pin1
of IC326 change 0V to 5V at the power
supply initial input mode?
•Check the PN403.
•Check the SMPS board.
YES
YES
NO
•Check the IC326 (RESET IC).
NO
Are the IC405 Pin 4
and X302 oscillating?
YES
•Is the pin4 of IC305 3.9V?
•Is the Pin32 of IC108 2.0V?
•Is the Pin4 of IC414 3.3V?
YES
•Is the Pin7 of IC210 2.5V?
•Is the pin1 and 2 of IC210 2.0V?
YES
•Is the pin1 of IC204 8.0V?
•Is the pin1 of IC205 8.0V?
YES
•Check the X302, IC405.
•Check the IC320 (µ-COM), PN402,
Pin 7 (33M).
NO
•Check the IC305 (BA3939).
•Check the IC108 (CXA2551R).
•Check the IC414 (BA033S).
NO
Check the IC210 (NJM3414).
NO
•Check the IC204 (NJM7808).
•Check the IC205 (NJM7808).
NO
OK

NO
After eject tray, Inset CD-R Blank
Disc and reloading.
NO
Does Disc stop? Go to "Spindle control is abnormal 3"
NO
NO
YES
Does Disc rotate
continuously as Disc recognition
is abnormal? Go to "Disc recognition is abnormal"
YES
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System Check.
Load tray without inserting disc.
Does Tray operate normally? Go to "Tray operation is abnormal"
YES
NO
Does Pick-up move to inside? Go to "Sled operation is abnormal"
YES
NO
Does Spindle Motor rotate in a moment? Go to "Spindle operation is
abnormal"
YES
NO
Does Lens move Up/Down?
YES
Does Laser turn on?
Go to "Focus Actuator operation is
abnormal"
YES
NO
Go to "Laser is abnormal"
NO
OK
After eject tray, Inset CD Disc and reloading.
Does Disc stop? Go to "Spindle control is abnormal 1"
NO
YES
Does Disc rotate
continuously as Disc recognition
is abnormal? Go to "Spindle control is abnormal 2"
YES

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Tray operation is abnormal.
Is there Tray control signal intput?
(IC203 pin26)
(Tray open/close doesn't work)
YES
•Check the connection of IC110 pin 12.
•Replace the IC320 (M62352).
•Check the communication line between
IC110 and IC320 (MICOM).
•Check the Tray Connector (PN203).
•Check the Motor Line and Motor.
NO
NO
Is there Tray drive voltage output?
(IC203 pin15, 16)
YES YES
YES
•Check the connection of IC322
Pin13
NO
Replace the IC203 (BA5983FM).
NO
Is TRAY_MUTE
signal"L"? (IC203 pin20)
When PN203
is open, Is there Tray drive
signal output?

NO
NO
NO
NO
NO
Replace the IC320 (MICOM)
NO
Check the connection of IC320
pin 26.
NO
Replace the IC206 (BU4053)
YES
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Sled operation is abnormal.
Is there
Sled control signal output?
(IC320 pin 85)
Is there
Sled drive voltage input?
(IC203 pin 23)
Check the connection of IC320
pin 85
YES
YES
NO
YES
Check the connection of IC201
pin 17.
Replace the IC201 (BA5925)
Is there
Sled drive voltage output?
(IC203 pin 17, 18) Is Act_Mute signal "L"?
(IC203 Pin9)
YES
Is there
HALL/SLDOUT signal input?
(IC320 pin82)
Is there HALL 1
signal input (IC206 pin3)
YES
Is there
SLED FG signal input?
(IC320 pin97)
YES
Replace the IC203 (BA5983)
Check the IC201 (BA5925)
•Check the Connector (PN201)
•Replace the SLED Motor.
OK

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NO
NO
•Check the connection of IC301 pin2.
•Replace the IC301 (OTI-9790)
NO
•Replace the IC207 (NJM3404).
NO
•Check the connection of IC320 pin98.
•Replace the IC320 (MICOM)
NO
•Check the connection of IC320 pin94.
•Replace the IC320 (MICOM)
•Check the connection of IC202 pin19.
•Replace the IC501 (BA6664FM)
•Check the spindle Connector
(PN202)
•Replace the Spindle Motor.
NO
Spindle operation is abnormal.
Is there Spindle
control signal input?
(IC202 pin 22)
YES
YES
YES
Is there Spindle
control signal output?
(IC207 pin 7)
YES
Is there DMO signal input?
(IC207 pin5)
Is there Spindle
drive voltage output?
(IC202 pin 2,4,7) Is SPNON signal “H”?
(IC202 pin 23)
YES
YES
Is SBRK signal “L”?
(IC202 pin 18)
NO
Is there
a SPNFG signal input?
(IC320 pin 95, IC301
pin 7)
YES
Replace the IC206 (BU4053).
OK

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NO
NO
•Check the connection of IC301 pin207.
•Check the communication line between
IC301 and IC320
•Replace the IC301 (OTI-9790)
•Check the connection of IC320
pin26.
•Replace the IC320 (MICOM)
NO
Focus Actuator operation
is abnormal
Is there
Focus Search control signal
input? (IC203 pin 3)
(FAO)
YES
YES YES
Is Act_Mute signal “L”?
(IC203 pin 9)
Replace the IC203 (BA5983).
•Check the connection of PN101 Pin 1,4.
•Check the Pick-up Connector.
Replace the Pick-Up.
Is there Focus Search
drive voltage output?
(IC203 pin 13,14)
NO
NO
Go to “Focus Servo is unstable”
Replace the IC108 (CXA2551R).
NO
Spindle control is abnormal 1
Does FOCUS Servo
operate normally?
YES
YES YES
Is there a output normally?
(IC108 pin 71, 72)
Replace the IC103 (EL2245).
Go to “Spindle operation is
abnormal”
Is there
RFAC(EFM)signal input?
(IC301 pin 163)

YES
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NO Go to “RF output is abnormal”
Spindle control is abnormal 2
(CD-RW Disc)
Is there
RRF signal input?
(IC103 pin 3)
YES
NO Replace the IC103 (EL2245).
Is there
RFDC signal input?
(IC108 pin 85)
YES
NO Go to “Track servo is unstable”
Does Tracking
Servo operate normally?
YES
Go to “Disc recognition is abnormal”
NO NO Go to “RF output is abnormal”
Spindle control is abnormal 3
Is there WBLIN signal
input? (IC301 pin 132) Is there ATFM signal output? (IC108 pin 25)
YES
Replace the IC108 (CXA2551R).
NO Replace the IC301 (OTI-9790).
Is there DMO signal
output? (IC301 pin 2)
YES
Go to “Spindle operation is
abnormal”

NO
YES
-18-
YES
NO Go to “RF output is abnormal”
Disc recognition is abnormal
Is
CDR/RW signal input
normal? (IC301 pin 33)
Is
RECD1, RECD2 signal
output normal? (IC108 pin
80,81)
YES
Replace IC320 (MICOM)Go to “Track Servo is unstable”
NO NO Go to “Laser is abnormal”
•Check the PICK UP FFC.
•Replace the PICK UP
RF output is abnormal
Is
PICK UP(A,B,C,D) output
normal? (PN101 pin 8,9,
14,15)
Is RRF signal
output normal? (IC108 pin 86)
•First Recognition try : Over 1.7 Vpp
•Second Recognition try :
Over 0.5 Vpp
YES
NO •Check the connection between
PN101 and IC108.
•Replace the IC108 (CXA2551R).
OK

YES
-19-
NO Check the IC108 (CXA2551R).
Focus Servo is unstable
Is FE signal
output normal in Focusing
Up/Down? (IC108
pin 56)
YES
Go to “RF output is abnormal”
NO Replace the IC301 (OTI-9790).
Go to “Focus Actuator operating
is abnormal”
NO NO •Check the PICK UP FFC.
•Replace the PICK UP.
Track Servo is unstable
Is TE signal
output normal in Focusing ON
and Tracking OFF?
(IC108 pin57)
Is PICK UP (E,F,G,H)
output normal? (PN101
pin 16,7,13,10)
YES
Check the IC108 (CXA2551R).
Go to “RF output is abnormal”
NO Check the IC104 (NJM3403)
Is TE signal
input normal in Focusing
ON and Tracking OFF?
(IC301 pin198)
YES
NO Replace the IC301 (OTI-9790).
Is
there TAO signal
output in Tracking ON?
(IC301 pin 208)
YES
Check the Driver
IC(IC203(BA5983)) and P/U refer-
ring to “Focus Actuator operating
is abnormal.”
Is FAO signal
output normal in Focusing
Up/Down? (IC301
pin 207)
YES

YES F
G
Normal
YES
NO
NO
NO
NO
YES
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NO
YES
YES
Laser is unstable
Is EEPROM Data valid?
Execute “B.Calibration Data”of
“How to use Test Tool (Dragon)
Execute “C.LD Power setup”of
“How to use Test Tool (Dragon)”
OK?
OFF LEVEL NG?
VRDC NG?
VWDC1 NG
Execute “D.LD Inspection”of
“How to use Test Tool (Dragon)”
E