NAD L75 User manual

SERVICE MANUAL
L75
A/V RECEIVER
NAD ELECTRONICS INTERNATIONAL
TORONTO
© NAD 2001

SERVICE MANUAL
L75
A/V RECEIVER
L75
A/V RECEIVER

1-3
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES.......................................................................................... 1-4
SERVICING PRECAUTIONS ....................................................................................................................... 1-5
* General Servicing Precautions
* Insulation checking prodedure
* Electrostatically Sensitive Devices
SPECIFICATIONS ......................................................................................................................................... 1-6
LOCATION OF CUSTOMER CONTROLS ......................................................................................... 1-7 ~ 1-8
EXPLODED VIEW ............................................................................................................................. 1-9 ~ 1-10

1-4
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
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.
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.

1-5
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.)

1-6
SPECIFICATIONS
Amplifier Section
Output Power (Front) :
F.T.C Rating:
60 watts RMS per channel minimum, both channels
driven into 8 ohms from 20 Hz to 20kHz with no
more than 0.09% total harmonic distortion
Surround Output Power (0.5% THD, 1 kHz, 8 ohms) :
40 + 40 Watt (Front)
40 Watt (Center)
40 + 40 Watt (Rear)
Total Harmonic Distortion (Front) :
0.02 % (at 60 watts, 1 kHz)
Delay Time :
DOLBY DIGITAL : REAR : 0 - 15 ms
CENTER : 0 - 5 ms
DOLBY PRO LOGIC : REAR : 15 - 30 ms
Audio Input Sensitivity/Impedance :
*LINE : 200 mV/47 k ohms
Output Level / Impedance :
TAPE REC : 185 mV/2.2 k ohms
Frequency Response :
*LINE : 20 Hz - 65 kHz, +1/ -3 dB
Signal-to-Noise Ratio : 1 Watt
*LINE : 70 dB (IHF-A)
Tone Control :
BASS : ±10 dB at 100 Hz
TREBLE : ±10 dB at 10 kHz
Digital Audio Section
Sampling Frequency :
32 kHz, 44.1 kHz, 48 kHz
DIGITAL Input Level/Impedance
COAXIAL : 0.5 Vp-p/75 ohms
OPTICAL : -15 dBm ~ -21 dBm
Video Section
Input Sensitivity /Impedance : 1.0 Vp-p/75 ohms
Output Level /Impedance : 1.0 Vp-p/75 ohms
*LINE means TAPE, AUX, VIDEO 1, VIDEO 2, DVD
Improvements may result in specifications and features
changing without notice.
lllustrations may differ slightly from production models.
FM Tuner Section
(Without notes 100.1 MHz, 65 dBf)
Tuning Range :
87.5 MHz - 108.0 MHz C: 50 kHz steps
AH: 100 kHz steps
AM Suppression Ratio: C: 45 dB
AH: 60 dB
Total Harmonic Distortion (1 kHz) :
Mono : 0.4%
Stereo : 0.5%
Frequency Respones : 30 Hz - 15 kHz, +1/ -1. 5 dB
Stereo Separation (1 kHz) : C: 40 dB
AH: 35 dB
Signal-to-Noise Ratio :
Mono : 75 dB
Stereo : 70 dB
AM Tuner Section
Tuning Range:
C : 522 kHz - 1,620 kHz (9 kHz steps)
AH : 530 kHz - 1,720 kHz (10 kHz steps)
Usable Sensitivity : 55 dB/m
Total Harmonic Distortion : 0.8% at 85 dB/m
Signal-to-Noise Ratio : 45 dB at 85 dB/m
General
Power Requirements :
C : 230V AC, 50Hz
AH : 120V AC, 60Hz
Power Consumption : C: 1.2A
AH: 2.3A
AC Outlets : unswitched x 1, Total 100 W max. (1A)
(AH Version only)
Dimensions (W x H x D) : 285 x 133 x 348
Weight (net) : 8.8kg

1-7
LOCATION OF CUSTOMER CONTROLS
POWER STANDBY/ON button VFL Display
PHONES
BASS/TREBLE
Tone Controls
MASTER VOLUME
Control
BALANCE
Control
SOURCE SELECTOR
Control
AUDIO Signal jacks
VIDEO Signal jacks
PRE OUT jack
DIGITAL OUT jacks
SPEAKER terminals
(For AH version only)
Dolby Digital / DTS / PCM
DIGITAL IN jacks
S-VIDEO Signal jacks
FRONT PANEL
REAR PANEL

1-8
SURROUND MODE indicator
TUNED indicator RDS indicator MEMORY indicator
TUNER MUTE indicator
INPUT SOURCE, FREQUENCY,
LEVEL indicator
DELAY TIME, PRESET
CHANNEL indicator
VFL DISPLAY
REMOTE CONTROL
1. POWER ON/OFF button (L75/L55)
2. SLEEP button (L75)
3. INPUT SOURCE Selector buttons (L75)
4. SURROUND MODE button (L75)
5. TEST TONE button (L75)
6. NUMERIC button (L75/L55)
7. PROGRAM button (L55)
8. OSD ON/OFF button (L75), DVD SET UP button (L55)
9. DIGITAL INPUT/RDS button (L75), DVD DISPLAY button (L55)
10. TITLE button (L55)
11. MENU buttons (L55)
12. ARROW buttons (L75/55)
VOLUME UP/DOWN, PRESET UP/DOWN buttons (L75)
13. ENTER button (L75/55)
14. RETURN button (L55)
15. MUTE button (L75)
16. OPEN/CLOSE buttons (L55)
17. STOP button (L55)
18. PLAY button (L55)
19. FOR/ REV, SCAN/SKIP button (L55)
20. SLO W buttons (L55)
21. PAUSE/STEP button (L55)
22. REPEAT button (L55)
23. CLEAR button (L55)
24. AUDIO button (L55)
25. ANGLE button (L55)
26. ZOOM button (L55)
27. SUBTITLE button (L55)
28. SWITCH

10C:KRE1A037LOCKER
KUP11396-6PCB , HEADPHONE
SUB PCB
1
1
1
1
1
1
1
1
1
1
1
1
1
SPECIAL SCREW
4KTB4+6FFZ
KTB3+6JFZ
KTB3+10GFZ
66
67 SCREW
SCREW
SCREW
BDMMDN4RB4MRC
TRANS , MAIN
TRANS , SUB
TUNER,MODULE
MOTOR
KUP11431-4PCB , CONNRCTOR
KUP11395-3PCB , PSU
KUP11395-2PCB , TRANS
KUP11395-1PCB , MAIN
KUP11431-2PCB , AC OUTLET
KUP11431-3PCB , SUB TRANS
KUP11431-1PCB , SPEAKER
KUP11397-2PCB , SURROUND AMP
KUP11397-1PCB , FRONT AMP
KUP11398PCB , SURROUND
KUP11396-1PCB , U-COM
KUP11396-7PCB , GUIDE
KUP11396-5PCB , SVIDEO INPUT
KUP11396-4PCB , VIDEO INPUT
KUP11396-2/3 1
12SUPPORT, H/S
KUP11396-1
KMH1A119
4
4
7
1
10
15
8
12
2
7
KHD1A016
KTS3+8J
SPECIAL SCREW
SCREW
KTB3+6F
KTB3+10G
KTWS3+10G
KHD1A012
KTB3+8J
KTB3+16J
KSN2+4
SCREW
SCREW
SCREW
SCREW
SCREW
SCREW
SCREW KTB3+6J
52
51
54
56
55
58
60
59
57
53
2
4
5
KTW3+16J
KTW3+8J
KTB4+6J
SCREW
SCREW
SCREW
62
64
63
65
61 KTW3+14JSCREW 4
AC CORD
1HOLDER, PCB
KMY1A116SINK, HEAT(R)
KHE170
KGL1A188
1
3
1
KBT1A745M7K102
KBT1A756M7K102
KGU1A245A10
1
1
KGW1A299
KDD1A013
WINDOW, SENSOR
KNOB, DISPLAY
FAN
PANEL, SUB
KNOB, POWER
PCB , AUDIO INPUT
KMH1A117COVER, FAN
1
2
1
3
1
1.2
1
1
1
1KMY1A115
KGU1A244A8
KGK1A064ZA
KGK2A064YA
KGK1A063ZA
KKM1A062C26
SINK, HEAT(F)
WINDOW,FIP
INDICATOR,POWER
VOLUME KNOB ASS'Y(A)
VOLUME KNOB ASS'Y(B)
VOLUME KNOB ASS'Y
AL PANEL
SIDE BAR
1
1
1
1
1
1
PANEL , REAR
CHASSIS , BOTTOM KUA1A190
6KHE1A023PCB MOUNT
1
1
46
BHG1A171
48
47
Q,tyPARTS-NO
44
45
43
36
37
39
38
35
41
42
40
26
33
34
31
32
1
29
30
1
27
28
1KKC1B082S21
4
4
BKL1A060
KHR1A028
TOP CABINET
FOOT
FOOT CUSHION
AC CORD BUSHING
21
22
24
25
23
11
12
14
16
17
15
18
19
20
13
6
7
9
10
8
DESCRIPION
5
4
3
2
1
N0
X2
3
64
X10
61 X4
56
X2
64 X2
X2
60
X2
53
X4
X4
63
x6
x6
59
26
x6
58
x6
26
59
x9
x6
58
40
x2
x2
x4
60
57
13
46
38
42
22
21
x6
53
X2
60
x3
x4
17
x4
x4
63
19
18
29
47
41
31
30
34
66 39
37
65
45
43
35
25
16
15
48
14
36
62
33
12
11
8
7
6
x3
5
55
44
9
8
10
4
x2
53
X7
54
x2
x4
x4
52
2
1
51
X10
66
32
X21
67
24
23
2KHG1A198RUBBER , TRANS
C:KLT5L052ZE
C
C
27 X10
C:BNVTFCE1E319A
KKM1A105ZC26
C:KLT5V026ZE
C:14
C:19
C:BJA2B044Z
C:KKF1A212ZK1
2
AH:KLT5L052ZU
22 AH
39 AH
AH:BNVTFCE1U116A
AH:KLT5V026ZU
AH:13
AH:21
AH:KKF2A212YK1
AH:BJA523FBY
1-9 1-10
EXPLODED VIEW

2-11
SECTION 2
ELECTRICAL CONTENTS
CONTENTS
IC BLOCK DIAGRAMS & PIN DESCRIPTION ........................................................................................ 2-11
1. IC81 (TMP87PS71F u-COM) .............................................................................................................. 2-12
2. IC34 (YSS912C AC3/DTS Decoder) .................................................................................................. 2-14
3. IC84 (NJU3713G EXPANDOR) ........................................................................................................... 2-16
4. IC32 (AK4112VF DIR) ......................................................................................................................... 2-17
5. IC33 (AK4527VQ CODEC) .................................................................................................................. 2-17
6. IC21, 22, 23 (NJU3713G EXPANDOR) ............................................................................................... 2-18
7. IC12~15, 37~42, 82 (OPA2134UA, NJM2068MD, OPAMP) ............................................................... 2-18
8. IC35 (IS61C256A15J 256K SRAM) ..................................................................................................... 2-18
9. IC36 (TC9164AF FUNCTION) ............................................................................................................ 2-19
10. IC36 (TC9163AF FUNCTION) ........................................................................................................... 2-19
11. IC16 (TC9482F ELECTRONIC VOLUME) ........................................................................................ 2-20
12. IC31 (TC74HCUO4AFN INVERTER)................................................................................................ 2-20
13. IC85 (MC74HC14D INVERTER) ........................................................................................................ 2-21
14. IC25 (ANAM2024V OSD).................................................................................................................... 2-21
15. IC83 (SAA6579TV1 ROS FILTER)..................................................................................................... 2-22
16. TRANSISTOR, REGULATOR IC BLOCK DIAGRAM........................................................................ 2-22
DIAGRAMS ................................................................................................................................................ 2-23
1. BLOCK DIAGRAM ................................................................................................................................ 2-23
2. WIRING DIAGRAM .............................................................................................................................. 2-27
3. SCHEMATIC DIAGRAM ...................................................................................................................... 2-29
MAIN............................................................................................................................................2-29
FRONT ........................................................................................................................................2-31
INPUT..........................................................................................................................................2-33
AMP/ SPEAKER .........................................................................................................................2-35
SURROUND ...............................................................................................................................2-37
4. PRINTED CIRCUIT BOARDS ............................................................................................................. 2-41
MAIN ...........................................................................................................................................2-41
FRONT/ INPUT ...........................................................................................................................2-43
AMP/ SPEAKER .........................................................................................................................2-45
SURROUND ...............................................................................................................................2-47

2-12
PIN No. SYMBOL I/O DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34 ~ 35
36 ~ 43
44 ~ 65
66
67
68
69
70
71
72
73
74
75, 76
77, 78
79
80
-
REMOTE IN
RDS CLK
RDS DATA
Function Mute
EVOL Data
EVOL CLK
EVOL CE (STB)
Vpp (Test)
XIN
XOUT
RESET
X IN
X OUT
Vss (GND)
Back Up
Function SW 2
Function SW 1
Power ON
YSS912 DIN
OSD CS
Surr./OSD CLK
YSS912 CS
Surr./OSD Data
AK4112 CS
YSS912 CSBN
YSS912 RESET
PLL Data In
Func. STB
CLK 3
DATA 3
PLL CE
VDD/VCC
Option/VFL Grid
VFL Grid
FIP Segment
Vkk
Option
Protect IN
Stereo IN
Tuned IN
OSD IN
Hphone IN
Video Mute
SP ON/OFF
Volume (Encoder)
KEY Matrix
STB
Tuner Mute
-
I
O
I
O
O
O
O
-
I
O
I
I
O
I
I
I
I
O
O
O
O
O
O
O
O
O
I
O
O
O
O
-
O
O
O
-
I
I
I
I
I
I
O
I
I
I
O
O
Not Use (No connection)
Remote Control Sensor Data Input
RDS IC (SA6579TV1) CLK/Data Port
Function Mute Control Output port (Active “H”)
Electronic Vol. IC (TC9482F) Data/CLK/STB Port
Program Supply Voltage (GND Connection)
32.788KHz Crystal Connection Port
Reset Input Port (“L”)
8MHz Cystal Connection Port
Device GND Port
Back Up Mode Control Port (“L”)
Function Selector (ENCODER) Control port
Power ON Control port (Active “L”)
YSS912 Data Input Ports
ODS IC (ANAM2024V) Chip Selector Port
Surr./OSD CLK Output port
Chip Selector port for YSS912
Surr./OSD Data Output Port
Chip Selector Port for AK4112
Sub DSP Chip Selector for YSS912
Reset (Initial Clear) Port for YSS912
PLL IC (LC72131) Data Input Port
Func. IC (KIC9163/64) Strobe Control Port
Func./PLL IC CLK Control Port
Func./PLL IC Data Control Port
PLL IC (LC72131) Chip Enable Control Port
Power Supply Port (+5V)
Option Control Port/ VFL Grid Control Port
VFL Grid Control Port
VFL Segment Control Port
VFL Power Supply Port (-30V)
Option Control Port
Protect Input Port (“L”)
Stereo Display Control Port (“L”)
Tuned Display Control Port (“L”)
ODS Input Control Port
Headphone In/ Out Defect Port
Videon Mute Control Port (“L”)
Speaker ON/OFF Control Port
Master Volume Up/Down Control Port
Key Control Input Port
Extended IC (NJU3713G) Strobe Control Port
Tuner Mute Control Port
IC PIN FUNCTION (IC81 : TMP87PS71F-ANAM 1328AT OTP, UCOM)

2-13
u-COM IC PIN ASSIGNMENT & BLOCK DIAGRAM
PIN ASSIGNMENTS
(TOP VIEW)
P96 (S14) P95 (S13) P94 (S12) P93 (S11) P92 (S10) P91 (S9) P90 (S8) P87 (S7) P86 (S6) P85 (S5) P84 (S4) P83 (S3) P82 (S2) P81 (S1) P80 (S0) P77 (G0) P76 (G1) P75 (G2) P74 (G3)
(SIS) P97
123456789101112131415161718192021222324
55565758596061626364 54 53 52 51 50 49 48 47 46 45 44 43 42 41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
VKK
(KEY0) P40
(KEY1) P41
(KEY2) P42
(KEY3) P43
(KEY4) P44
(KEY5) P45
(CIN5/KEY6) P46
(CIN4/KEY7) P47
(CIN3) P50
(CIN2) P51
(CIN1) P52
(CIN0) P53
P54
(PWM/PDO) P55
P73 (G4) P72 (G5) P71 (G6) P70 (G7) P67 (G8)
(INT0) P10
(INT1) P11
(INT2/TC1) P12
(DVO) P13
P14
(TC2) P15
P16 P17
TEST
(XTIN) P21 (XTIN) P22
RESET
XIN
XOUT
VSS
(INTS/STOP) P20
(INT3/TC3) P30
(TC4) P31
(SCK) P32
(SI) P33
(SO) P34
(HSCK) P35
P36
(HSO) P37
P66 (G9)
P65 (G10)
P64 (G11)
P63 (G12)
P62 (G13)
P61 (G14)
P60 (G15)
VDD
P07
P06
P05
P04
P03
P02
P01
P00
BLOCK DIAGRAM
VDD P9
VFT drive circuit (automatic display) Key scan
control
Program counter
Register banks
Stack PointerP S W
Interrupt Controller
System Controller
Standby Controller
Timing Generator
High
frequ.
Low
frequ.
Clock
Generator
Time Base
Timer
16-bit
Timer/Counters
TC1 TC2 TC3 TC4 SIO HSO
8-bit
Timer/Counters
Serial
Interfaces
6-bit A/D
Converter
P4
P47
to
P40
P5
P55
to
P50
P3
P37
to
P30
P1
P17
to
P10
P0
P07
to
P00
P2
P22
to
P20
Inst.
Register
Inst.
Decoder
Watchdog
Timer
Flags
ALU RBS
Program Memory
(ROM)
Data Memory
(RAM)
I/O Ports
P97
to
P90
P8
Output Ports
P87
to
P80
P7
I/O Ports
P77
to
P70
P6
P67
to
P60
Power Supply
VFT Power
Supply
Reset I/O
Test Pin
Resonator
connecting
Pins
VSS
VKK
RESET
TEST
XIN
XOUT
I/O Ports

2-14
PIN No. SYMBOL I/O DESCRIPTION
1,31,71
2
3
4
5
6
7
8
9
10, 20
11
12
13
14
15
16
17
18
19
20
21,41,51,81,91
22
23
24
25 ~ 29
32
33 ~ 39
40,50,60,80,90,100
42 ~ 44
45 ~ 47
48
49
52
53
54
55
56
57
58
59
61
62
63
64
65
66
67
68
69
VDD1
RAMCEN
RAMA16
RAMA15
SDIB0
SDIB1
SDIB2
XI
XO
VSS
AVDD
SDIB3
TEST
TEST
OVFB
DTSDATA
AC3DATA
SDOB3
CPO
AVSS
VDD2
SDOA2
SDOA1
SDOA0
RAMA 14~10
OPORT 0
OPORT 1~7
VSS
RAAM 9~7
SDOB 2~0
SDBCK1
SDWCK1
NONPCM
CRC
MUTE
KARAOKE
SURENC
/SDBCK 0
RAMA6
RAMA5
RAMA4
/IC
TEST
RAMA3
/CSB
/CS
SO
SI
SCK
-
O
O
O
I+
I+
I+
I+
O
-
-
I+
-
-
O
O
O
O
A
-
-
O
O
O
O
O
O
-
O
O
I+
I+
O
O
O
O
O
O
O
O
O
Is
-
O
Is+
Is
Ot
Is
Is
+5V Power Supply(for I/Os)
External SRAM interface /CE
External SRAM interface address 16 (not use)
External SRAM interface address 15 (not use)
PCM input 0 to Sub DSP(not use)
PCM input 1 to Sub DSP(not use)
PCM input 2 to Sub DSP(not use)
Crystal oscillator connection(12.288MHz)
Ground
+3.3V power supply (for PLL circuit)
PCM input 3 to Sub DSP (not use)
Test terminal(to be open in normal use)
Test terminal(to be open in normal use)
Detection of overflow at Sub DSP (not use)
Detection of DTS data (not use)
Detection of AC-3 data (not use)
PCM output from Sub DSP (not use)
Output terminal for PLL,to be connected to ground through the external analog filter circuit
Ground for PLL circuit)
+3.3V power supply (for core logic)
PCM output from Main DSP (C,LFE) (not use)
PCM output from Main DSP (LS,RS) (not use)
PCM output from Main DSP (L,R) (not use)
External SRAM interface address 14~10
Output port for general purpose
Output port for general purpose (not use)
Ground
External SRAM interface address 9~7
PCM output from Sub DSP
Bit clock input for SDOA,SDIB,SDOB (not use)
Word clock input for SDOA,SDIB,SDOB (not use)
Detection of non-PCM data (not use)
Detection of AC-3 CRC error (not use)
Detection of auto mute (not use)
Detection of AC-3 karaoke data (not use)
Detection of AC-3 2/0 mode Dolby surround encoded input (not use)
Inverted SDBCK0 clock output (not use)
External SRAM interface address 6
External SRAM interface address 5
External SRAM interface address 4
Initial clear
Test terminal (to be open in normal use)
External SRAM interface address 3
Sub DSP Chip select
Microprocessor interface Chip select input
Microprocessor interface serial data output
Microprocessor interface /Sub DSP Serial data input
Microprocessor interface /Sub DSP clock input
AC 3/DTS DECODER (YSS912C:IC34)

2-15
PIN No. SYMBOL I/O DESCRIPTION
70
72 ~ 79
82
83
84
85
86
87
88
89
92 ~ 99
RAMA2
RAMD0~7
SDWCK0
SDBCK0
SDIA0
SDIA1
RAMA1
RAMA0
RAMWEN
RAMOEN
IPORT7~0
O
I+/O
I
I
I
I
O
O
O
O
I+
External SRAM interface address 2
External SRAM interface data (STREAM0~7 output when External SRAM is not in use)
Word clock input for SDIA, SDOA, SDIB, SDOB
Bit clock input for SDIA,SDOA,SDIB,SDOB
AC-3 Bitstream (or PCM) data input for Main DSP
AC-3 Bitstream (or PCM) data input for Main DSP
External SRAM interface address 1
External SRAM interface address 0
External SRAM interface /WE
External SRAM interface /OE
Input port for general purpose (not use)
NOTE) Is: Schmidt trigger input terminal It: Input terminal with pull-up resistor
O: Digital output terminal Ot: Tri-state digital output terminal
A: Analog terminal
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
80
79
78
77
76
75
74
73
72
71
70
68
67
66
65
64
63
62
61
60
69
58
57
56
55
54
53
52
51
59
1
VDD1
V
SS
IPORT0 IPORT1 IPORT2 IPORT3 IPORT4 IPORT5 IPORT6 IPORT7 VDD2 VSS RAMOEN RAMWEN RAMA0 RAMA1 SDIA1 SDIA0 SDBCK0 SDWCK0 VDD2
VDD1
OPORT0 OPORT1 OPORT2 OPORT3 OPORT4 OPORT5 OPORT6 OPORT7
VDD2
VSS
RAMA9 RAMA8 RAMA7
SDOB2 SDOB1 SDOB0
SDBCK1
SDWCK1
VSS
RAMCEN
RAMA16
RAMA15
SDIB0
SDIB1
SDIB2
XI
XO
VSS
AVDD
SDIB3
TEST
TEST
OVFB
DTSDATA
AC3DATA
SDOB3
CPO
AVSS
VDD2
SDOA2
SDOA1
SDOA0
RAMA14
RAMA13
RAMA12
RAMA11
RAMA10
VSS
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
12
23
24
25
26
27
28
29
30
22
VSS
RAMD7
RAMD6
RAMD5
RAMD4
RAMD3
RAMD2
RAMD1
RAMD0
VDD1
RAMA2
SCK
SI
SO
/CS
/CSB
RAMA3
TEST
/IC
RAMA4
VSS
RAMA5
RAMA6
/SDBCK0
SURENC
KARAOKE
MUTE
CRC
NONPCM
VDD2
YSS912C PIN CONFIGURATION

2-16
Coefficient
Program RAM
SDBCK1
SDWCK1
SDOB0
SDOB1
SDOB2
SDOB3
OVFB RAMA 0~16 RAMA 0~7 SDIB3 SDIB2 SDIB1 SDIB0 SDOA2 RAMOEN RAMWEN RAMCEN SDOA1 SDOA0 CPO XO XI
SDOB Interface
SDOBCKSELSDOBCKSELSDOACKSEL
L,R
/SDBCK0
SDBCK0
SDWCK0
SDIA0
SDIA1
SURENC
KARAOKE
MUTE
CRC
AC3DATA
DTSDATA
NONPCM
LS,RS
C, LFE
SDIBSEL
SDIB Interface
SDOA Interface
SDIA Interface SDIA Interface
ERAMUSE
24 * 16
Sub DSP
SDIASEL
24 * 16
Main DSP
AC-3/Pro Logic/DTS
decoder
Input Buffer
Microprocessor
Interface
Control Registers
IPORT 0~7
/CS
SO
SI
SCK
OPORT 0~7
/CSB
SCK
SI
Control SignalsControl Signals
Data RAM
Delay RAM
PLL
Operating clock
(30MHz)
STREAM 0~7 External RAM
interface
YSS912C BLOCK DIAGRAM
NJU3713G (EXPANDOR IC 84)
Shift Circuit
Latch Circuit
Controller Circuit
P1
P2
P3
P4
P5
P11
P12
CLK
DATA 10
11
12
13
14
15
16
17
1
8
9
STB
CLR

2-17
AV4527VQ (CODEC IC33)
ADC
LIN+
LIN-
RIN+
RIN-
(FL)
(FR)
(LS)
(RS)
(C)
(SUB)
HPF
FOMAT
CONVERTER
SDOS
SDTO
SDTI1
SDTI2
SDTI3
Audio
I/F
MCLK MCLK
LRCK
LRCK
BICK
BICK
DAUX
SDOUT
SDIN1
SDIN2
SDIN3
AK4527
RX1
LRCK
MCKO
DIR
AK4110
AC3
XTO
XTI
BICK
SDTO
RX2 RX3 RX4
LRCK
BICK
SDIN
SDOUT1
SDOUT2
SDOUT3
ADC HPF
LOUT1
ROUT1
DACLPF
30
29
32
31
27
28
25
26
23
24
39
5
4
10
1
9
6
7
8
DATT
DACLPF DATT
DACLPF DATT
DACLPF DATT
DACLPF DATT
DACLPF DATT
LOUT2
ROUT2
LOUT3
ROUT3
AK4112AVF (DIR IC32)
RX1
FS96
DAUX
LRCK
BICK
SDTO
CSN
TVDD
CCLK
CDTO
CDTI
AVSS AVDD R MCKO1 XTI XTO
P/S="L"
ERF
[Serial Control Mode]
AUTO
MCKO2
RX4
V/TX
RX2
RX3
DVSS
PDN
DVDD
Input
Selector
System
Control
Clock
Recovery
DAIF
Decoder
AC-3/MPEG
Detect
Clock
Generator
Error
Detect
DEM
1
4
14
13
12
11
10 9 8 24 23 5 6
17
22
19
21
20
3
25
26
28
27
2
7
15 18 16
X’tal
Oscillator
96kHz
Detect
Audio
I/F
uP
I/F

2-18
S5
S1
S2
6.2dB
Amp 75
dirver
6.2dB
Amp
6.2dB
Amp
S4
S3
S6
S7
20K
20K
20K
13
Vin1
V+
V-
SW2 SW1
Vout1
Vout2
Vout3
SW4
BLOCK DIAGAM (NJM2296M /MAIN IC96)
SW3 GND
SW5
Vin2
Vin3
Vin4
Vin5
1
15
11
16 10 14
12
2
9
7
5
46 8
3
20K
20K
20K
20K
20K
75
dirver
75
dirver
1
2
3
4
8PIN FUNCITON
1. A OUTPUT
2. A-INPUT
3. A+INPUT
4. V
5. B+INPUT
6. B-INPUT
7. B OUTPUT
8. V
A
B
7
6
5
OPA2134UA / NJM 2068MD)
(OP AMP / IC12~15, 37~42, 82) IS61C256A15J (256K SRAM. IC35)
NJM2296M (VIDEO SW / IC21, 22, 23)
A0-A14
(1~10, 21,
23~26)
(11, 12,
15~19)
I/O0-I/O7
CE1
VCC
GND
20
28
13
22
27
OE
WE
DECODER
I/O
DATA
CIRCUIT
CONTROL
CIRCUIT
256 x 1024
MEMORY ARRAY
COLUMN I/O

2-19
LEVEL SHIFTER
2
1
2
3
4
1
5
6
2
8
4
1
2
3
4
6
8
4
1
3
4
5
6
7
8
9
10
14 28
11
12
13
27
26
25
24
23
22
21
20
19
18
17
16
15
LATCH CIRCUIT
SHIFT REGISTER
LEVEL SHIFTER
LATCH CIRCUIT
L-S R-S
Vss GND VDD
L-S
L-S
L-S
L-S
L-COM
L-S
L-COM
L-S
7
L-S
L-COM
ST
R-S
R-S
R-S
5
R-S
1
R-COM
R-S
2
R-COM
R-S
R-COM
DATA
CK
7
R-S
LEVEL SHIFTER
2
1
2
4
8
4
1
2
4
8
4
1
3
4
5
6
7
8
9
10
14 28
11
12
13
27
26
25
24
23
22
21
20
19
18
17
16
15
LATCH CIRCUIT
SHIFT REGISTER
LEVEL SHIFTER
LATCH CIRCUIT
L-S R-S
Vss GND VDD
L-S
1
L-COM
3
L-S
L-S
5
L-S
2
L-COM
6
L-S
L-S
7
L-S
L-COM
ST
R-S
1
R-COM
3
R-S
R-S
2
R-COM
5
R-S
6
R-S
R-S
R-COM
DATA
CK
7
R-S
TC9164AF (FUNCTION IC36)
BLOCK DIAGRAM
TC9163AF (FUNCTION IC11)
BLOCK DIAGRAM

2-20
1dB
VR
latch
8dB
VR
latch
1dB
VR
latch
8dB
VR
latch
3 to 7
decoder
4 to 13
decoder
1dB
VR
latch
Shift register (32BIT) Strobe generate
circuit
Level shift circuit
8dB
VR
latch
2
3 L-OUTA(SUB) (C)
(C)
(R)
(R)
(L)
(L)
(SUB)
(LS)
(LS)
(RS)
(RS)
NC VSS VDD TEST
L-INA
4
5 L-A-GNDA
L-OUTB
6
L-INB
7
8 L-A-GNDB
L-OUTC
9
L-INC
10
12 CS1
GND
13
CK
14
L-A-GNDC
11
26 R-OUTA
R-INA
25
24 R-A-GNDA
R-OUTB
Same as L-ch
Circuit
23
R-INB
22
21 R-A-GNDB
R-OUTC
20
R-INC
19
17 CS2
STB
16
DATA
15
R-A-GNDC
18
1 28 27
TC9482F (ELECTRONIC VOLUME IC16)
PIN ASSIGNMENT (74HCU04AFN : IC40 )
1
2
3
4
5
6
7
1A
1Y
2A
2Y
3A
3Y
GND
6A
6Y
5A
5Y
4A
4Y
Vcc
14
13
12
11
10
9
8
1
2
3
4
5
6
7
1A
1Y
2A
2Y
3A
3Y
GND
6A
6Y
5A
5Y
4A
4Y
Vcc
14
13
12
11
10
9
8
TC74 HCU04AFN (INVERTER IC31) MC74HC14D (INVERTER IC85)

2-21
ANAM 2024V (OSA IC25)
CS 8
9 10 15 11 12 13 14 30 17 1 29 27 28 26 24 25 23 19 4 7 2 3 5 6 19 18 16 20 21
Serial- parallel converter
8-bit latch and command decoder
Horizontal character size register
Horizontal size counter
Vertical character size register
Vertical size counter
Horizontal display position register Horizontal display position detection
Character control counter
Line control counter
Horizontal dot counter
Vertical display position register
Vertical display position detection
Vertical dot counter
Flashing/ reversal control register
Flashing/ reversal control register
Display control register
RAM write address counter
Composite synchro- nization signal control
Composite synchro- nization signal separa- tor control
AFC
circuit
Sync separator
Sync detector
HSYN OUT VSYNOUT Xtal IN1 XtalIN2
XtalOUT1 XtalOUT2 CVCR CVIN CVOUT
Timing generator Synchronizztion
signal generator
Shift register
Font ROM
Decoder
Display RAM
Decoder
Character output control Background control Video output control
SCLK
SIN
RST
SECAM
525/625
NTSC/PAL
3.58/4.43
VDD1 VDD2
VSS 22
VSS
SYNCDET
VCOIN
VCOOUT
AMPIN
PD
SYN
SEPc
IN
AMPOUT
OUT
FC