NAD L 76 User manual

SERVICE MANUAL
L76
A/V RECEIVER
L76
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 : MOVIE : 10 - 25 ms
MUSIC : 0 - 15 ms
EMULATION : 10 - 25 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 : 50 kHz steps
AM Suppression Ratio: 45 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) : 40 dB
Signal-to-Noise Ratio :
Mono : 75 dB
Stereo : 70 dB
AM Tuner Section
Tuning Range: 522 kHz - 1,620 kHz (9 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 : 230V AC, 50Hz
Power Consumption : 1.2A
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
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
DEVICE SELECTOR
CHANNEL VOLUME
LEARN
RANDOM
AM FM
HTR L76
/ZOOM
TV/VIDEO
AUX
VIDEO 1 VIDEO 2
DVD
PROGRAM CLEAR REPEAT
TUNER
SETUP
SLEEP
TAPE
TV
AMP
VCR
CD DVD
TUNER
TAPE
MACRO
23
1
5
46
8
79
0
10+
MUTE
TEST
VOL
SURR.
MODE
CH
SLOW

MENU
RTN
DISP
TITLE
SURR.
CENTER
SUB
ENTER
ON
OFF
PRESET

SLOW

CAB/SAT
VFL DISPLAY
REMOTE CONTROL
1. POWER ON/OFF button (L76/L56)
2. DEVICE SELECTOR buttons
3. PROGRAM buttons (L56)
4. CLEAR button (L56)
5. REPEAT button (L56)
6. INPUT SOURCE SELECTOR buttons(L76), NUMERIC buttons (L76/L56)
7. OSD ON/OFF buttons (L76), DVD SET UP button (L56)
8. MUTE button (L76)
9. PRESET UP/DOWN buttons (L76), SLOW buttons (L56)
10. TEST TONE button (L76), ZOOM button (L56)
11. SURROUND MODE button (L76), RANDOM button (L56)
12. VOLUME UP/DOWN buttons (L76)
13. AM button (L76), TITLE button (L56)
14. FM button (L76), MENU button (L56)
15. ARROW buttons (L76/L56)
16. ENTER button (L76/L56)
17. DIGITAL INPUT/ RDS button (L76), DVD DISPLAY button (L56)
18. SLEEP button (L76), RETURN button (L56)
19. OPEN/CLOSE button (L56)
20. STOP button (L56)
21. PAUSE button (L56)
22. REV SCAN/SKIP button (L56)
23. PLAY button (L56)
24. FOR SCAN/ SKIP button (L56)
25. SURROUND LEVEL UP/DOWN buttons (L76)
26. CENTER LEVEL UP/DOWN buttons (L76)
27. SUBWOOFER LEVEL UP/DOWN buttons (L76)

1-9 1-10
EXPLODED VIEW
C:CKF1A212WK1
C:CJA2B043Z
C:19
C:14
C:CLT5V026YE
KKM1A105XC37
C:HNVTFCE1E319A
LOCKER C:KRE1A037 10
X10
27
C
C
C:CLT5L052ZE
RUBBER , TRANS KHG1A198 2
23
24
67 X21
32
66 X10
51
1
2
52
x4
x4
x2
54 X7
53 x2
4
10
8
9
44
55
5x3
6
7
8
11
12
28
62
36
14 48
15
16
25 35
43
45
65
37
39
66
34
30
31
41
47
29
18
19
63 x4
x4
17
x4
x3
60 X2
53
x6
21
22
42
38
46
13
57
60 x4
x2
x2
40
58
x6
x9
59
26 x6
58 x6
26
59 x6
x6
63
X4
X4
53 X2
60 X2
X2
64
X2
56
X4
61
X10
64 3X2
N0
1
2
3
4
5
DESCRIPION
8
10
9
7
6
13
20
19
18
15
17
16
14
12
11
23
25
24
22
21
AC CORD BUSHING
FOOT CUSHION
FOOT
TOP CABINET
KHR1A028
CKL1A060
4
4
CKC1B082S35 1
28
27
1
30
29
1
32
31
34
33
26
40
42
41
35
38
39
37
36
43
45
44
PARTS-NO Q,ty
47
48
CHG1A171
46
1
1
PCB MOUNT CHE1A023 6
CUA1A190CHASSIS , BOTTOM
PANEL , REAR
1
1
1
1
1
SIDE BAR
AL PANEL
VOLUME KNOB ASS'Y
VOLUME KNOB ASS'Y(B)
VOLUME KNOB ASS'Y(A)
INDICATOR,POWER
WINDOW,FIP
SINK, HEAT(F)
KKM2A062C37
KGK1A063YA
KGK2A064WA
KGK1A064XA
CGU1A244A8
CMY1A115 1
1
1
1
1.2
1
3
1
2
1
COVER, FAN CMH1A117
PCB , AUDIO INPUT
KNOB, POWER
PANEL, SUB
FAN
KNOB, DISPLAY
WINDOW, SENSOR
CDD1A013
CGW1A299
1
1
CGU1A245A10
CBT1A756M7K102
CBT1A745M7K102
1
3
1
CGL1A188
CHE170
SINK, HEAT(R) CMY1A116
HOLDER, PCB 1
AC CORD
4SCREW CTW3+14J61
65
63
64
62
SCREW
SCREW
SCREW
CTB4+6J
CTW3+8J
CTW3+16J
5
4
2
53
57
59
60
58
55
56
54
51
52
CTB3+6JSCREW
SCREW
SCREW
SCREW
SCREW
SCREW
SCREW
CSN2+4
CTB3+16J
CTB3+8J
CHD1A012
CTWS3+10G
CTB3+10G
CTB3+6F
SCREW
SPECIAL SCREW
CTS3+8J
CHD1A016
7
2
12
8
15
10
1
7
4
4
CMH1A119SUPPORT, H/S 12
1CUP11551-2/3
PCB , VIDEO INPUT
PCB , SVIDEO INPUT
PCB , GUIDE
PCB , SURROUND CUP11550-1/2
PCB , FRONT AMP CUP11397-1
PCB , SURROUND AMP CUP11397-2
PCB , SPEAKER CUP11431-1
PCB , SUB TRANS CUP11431-3
PCB , AC OUTLET CUP11431-2
PCB , MAIN CUP11395-1
PCB , TRANS CUP11395-2
PCB , PSU CUP11395-3
PCB , CONNRCTOR CUP11431-4
MOTOR
TUNER,MODULE
TRANS , SUB
TRANS , MAIN
BDMMDN4RB4MRC
SCREW
SCREW
SCREW67
66
CTB3+10GFZ
CTB3+6JFZ
CTB4+6FFZ 4
SPECIAL SCREW
1
1
1
1
1
1
1
1
1
1
1
1
1
PCB , HEADPHONE CUP11551-7
CUP11551-1PCB , U-COM 1
CUP11551-4
CUP11551-5
CUP11551-6
1

2-22 2-23
1. BLOCK DIAGRAM

2-24 2-25
BLOCK DIAGRAM

2-26 2-27
2. WIRING DIAGRAM

2-28 2-29
3. SCHEMATIC DIAGRAMS
MAIN SCHEMATIC DIAGRAMS

2-30 2-31
u-COM & GUIDE CIRCUIT DIAGRAM

2-32 2-33
INPUT SCHEMATIC DIAGRAM

AMP, SPEAKER, SUB TRANS & AC OUTLET CIRCUIT DIAGRAM
2-34 2-35

2-36 2-37
SURROUND CIRCUIT DIAGRAM

2-38 2-39
SURROUND CIRCUIT DIAGRAM

2-11
SECTION 2
ELECTRICAL CONTENTS
CONTENTS
IC BLOCK DIAGRAMS & PIN DESCRIPTION ........................................................................................ 2-11
1. IC81 (TMP87PS71AF u-COM)............................................................................................................ 2-12
2. IC35 (CS493264-CL DSP) ................................................................................................................. 2-14
3. IC34 (AK4586VQ DIR+CODEC)......................................................................................................... 2-16
4. IC21~23 (NJM2296M VIDEO SW) .................................................................................................... 2-18
5. IC12~15, 37~42, 82 (OPA213UA, NJM2068MD OP AMP) .............................................................. 2-18
6. IC84 (NJU3713G EXPANDOR) ......................................................................................................... 2-18
7. IC34 (TC9164AF FUNCTION) ............................................................................................................ 2-19
8. IC11 (TC9163AF FUNCTION) ........................................................................................................... 2-19
9. IC16 (TC9482F ELECTRONIC VOLUME) ....................................................................................... 2-20
10. IC31 (74HCU04AFN HEX INVERTOR)............................................................................................2-20
11. TRANSISTOR, REGULATOR IC BLOCK DIAGRAM........................................................................ 2-21
DIAGRAMS ................................................................................................................................................ 2-22
1. BLOCK DIAGRAM ................................................................................................................................ 2-22
2. WIRING DIAGRAM .............................................................................................................................. 2-26
3. SCHEMATIC DIAGRAM ...................................................................................................................... 2-28
MAIN............................................................................................................................................2-28
U-COM/ GUIDE...........................................................................................................................2-30
INPUT..........................................................................................................................................2-32
AMP/ SPEAKER .........................................................................................................................2-34
SURROUND ...............................................................................................................................2-36
4. PRINTED CIRCUIT BOARDS ............................................................................................................. 2-40
MAIN ...........................................................................................................................................2-40
FRONT/ INPUT ...........................................................................................................................2-42
AMP/ SPEAKER .........................................................................................................................2-44
SURROUND ...............................................................................................................................2-46

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
77, 78
79
80
-
REMOTE IN
RDS CLK
RDS DATA
Function Mute
EVOL Data
EVOL CLK
EVOL CE (STB)
Vpp (Test)
Volume 2
Volume 1
RESET
X IN
X OUT
Vss (GND)
Back Up
Function SW 2
Function SW 1
INTREQ
D OUT
OSD CS
Surr./OSD CLK
CS CS
Surr./OSD Data
AK CS
AK RESET
CS 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
Power ON/OFF
KEY Matrix
STB
Tuner Mute
-
I
O
I
O
O
O
O
-
I
I
I
I
O
I
I
I
I
I
O
O
O
O
O
O
O
O
I
O
O
O
O
-
O
O
O
-
I
I
I
I
I
I
O
I
O
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)
Master Volume (ENCODER) UP/DOWN control port
Reset Input Port (“L”)
8MHz Cystal Connection Port
Device GND Port
Back Up Mode Control Port (“L”)
Function Selector (ENCODER) Control port
Interrupt Reguest Input Port
CS493264-CL Data Input port
ODS IC (ANAM2024V) Chip Selector Port
Surr./OSD CLK Output port
Chip Selector port for CS493264-CL
Surr./OSD Data Output Port
Chip Selector Port for AK4586VQ
Reset (Initial Clear) Port for AK4586VQ
Reset (Initial Clear) Port for CS493264-CL
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
Power ON/OFF Control Port (Actire "L")
Key Control Input Port
Extended IC (NJU3713G) Strobe Control Port
Tuner Mute Control Port
IC PIN FUNCTION (u-COM : ANAM1328AT,O.T.P : TMP87PS71AF) : IC81

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