NAD T760 User manual

NAD
SERVICE MANUAL
T 760
SURROUND
SOUND RECEIVER
T 760
SURROUND
SOUND RECEIVER

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.

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.)

2
SERVICE SAFETY PRECAUTIONS
1. Replacing the fuses
CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY
WITH SAME TYPE OF FUSE.
Reference No Part Number Description
M751*AH 5120-0200-0 Fuse 5A 125V Time Lag 5x20 MM MITI/UL/CSA
M754*AH 5120-0052-0 Fuse 1.6A 250V Time Lag 5x20 MM UL/CSA
M752*C 5120-0024-0 Fuse 3.15A 250V Time Lag 5x20 MM SEMKO/VDE
NOTE:
<*AH > : USA, CANADIAN MODEL ONLY.
<*C > : EUROPEAN MODEL ONLY.
2. Safety check out
(Only U.S.A. model)
Before returning the product to the customer, make leakage current or resistance measurements
to determine that exposed parts are acceptably insulated from the supply circuit.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
Replace only with parts recommended by the manufacturer.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-19
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-38
IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39-46
ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47-69
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71-72
PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

3
SPECIFICATIONS
POWER AMPLIFIER AND PREAMPLIFIER SECTIONS
Rated distortion (THD 20Hz-20 kHz FC/C/FR) ≤0.08%
(THD 20Hz-20 kHz SL/SR) ≤0.3%
Input Sensitivity (ref. 8 ohms, 1 kHz) 180+/-30 mV
S/N Ratio (A-wtd, 1KHz, 1W, 8 ohm) ≥-76 dB
(A-wtd, 1KHz, 70W, 8 ohm) ≥-90 dB
Frequency Response (20 Hz - 20 kHz) 0 ± 0.8 dB
Channel Balance (1 dB to -40 dB, 1 kHz) ≤2 dB
(-41 dB to -50 dB, 1 kHz) ≤3 dB
Audio muting at 1kHz ≥53 dB
Headphone O/P in 0.1%, 600 ohm load, CD in 500mV, 1 kHz ≥10V
Subwoofer out, 500mV in (THD at 2V O/P, 100 Hz) ≥0.5%
(S/N at 2V O/P, 100 Hz) ≥80 dB
Crosstalk (2V input, 10W, 1 kHz) > -68 dB
Continuous average power output 70 W
Controls
Bass (at 500mV in, 1W out, 100 Hz) ±9dB
Treble (at 500mV in, 1W out, 10 kHz) ±9dB
SURROUND SECTION
Channel separation
I/p mode : L, R : 1V in, 1 kHz, Ch R, L ≥45 dB
: o/p at unexpected, 1 kHz, Ch C ≥35 dB
I/p mode : L= -R : 1V in, 1 kHz, Ch R, L ≥28 dB
: o/p at unexpected, 1 kHz, Ch C ≥30 dB
I/p mode : L= R : 1V in, 1 kHz, Ch R, L ≥45 dB
: o/p at unexpected, 1 kHz, Ch SL, SR ≥30 dB
Frequency Response
I/p mode : L, R : 1V in, 1W, Ch R, L 40Hz 0 ± 1.5 dB
20kHz 0 ± 0.8 dB
I/p mode : L= R : 1V in, 1W, Ch C 300Hz 0 ± 0.8 dB
20kHz 0 ± 0.8 dB
I/p mode : L= -R : 1V in, 1W, Ch SL, SR 30Hz 0 ± 1.0 dB
6.5kHz -3 ± 1.0 dB
S/N Ratio ( 200mV in, 1, A-WTD w/ 1k termination)
I/p mode : L, R : 1 kHz, Ch L, R ≥65 dB
I/p mode : L=R : 1 kHz, Ch C ≥65 dB
I/p mode : L=-R : 1 kHz, Ch SL, SR ≥65 dB
THD (2.2V in, 1W, w/ 80 kHz LPF, 1 kHz) ≤0.2%
AC-3/DTS SECTION
Frequency Response
FL, FR, C, SL, SR: 200Hz 0 ± 0.8 dB
20kHz 0 ± 0.8 dB
Distortion 1W all channels 0.08%
S/N 1 W ( CCIR/ARM, 200 Hz NOTCH & 400 Hz HPF) ≥85 dB

4
AM TUNER SECTION
Input level is expressed as the reading in open-circuit
of 75-ohm source impedance signal generator
Usable sensitivity (999/1000kHz) ≤30 dBµ
S/N Ratio (5mV in) ≥38 dB
THD (5mV in) ≤3%
IF Rejection (450 kHz) ≥36 dB
Image Rejection (F+2xIF) ≥28 dB
Selectivity ≥17 dB
Output 130+/- 20mV
Loop sensitivity (20dB S/N)
999/1000 kHz ≤66 dB
603/600 kHz ≤66 dB
1404/1400 kHz ≤66 dB
Frequency response (100 - 2.3 kHz, 5mV) ± 6 dB
FM TUNER SECTION *C *AH
Input level is expressed as the reading in open-circuit
of 75-ohm source impedance signal generator
Usable Sensitivity ( 98 MHz) ≤15 dBµ ≤15 dBµ
Signal / Noise Ratio Mono ≥72 dB ≥72 dB
(60 dBµ, IHF wtd) Stereo ≥66 dB ≥66 dB
Frequency Response (20 Hz - 15 kHz, 60 dBµ) 0 ± 1.5 dB 0 ± 1.5 dB
Channel Separation (60 dBµ) 100 Hz ≥30 dB ≥30dB
1 kHz ≥38 dB ≥38 dB
10 kHz ≥30 dB ≥30 dB
Alternate Channel Selectivity
(40 dBµ, ±400 kHz) ≥60 dB ≥45 dB
Capture Ratio (40 dBµ) ≤3 dB ≤3 dB
AM Suppression
(60 dBµ, 100% Mod.FM, 30% Mod.AM) ≥48 dB ≥48 dB
Image Rejection (119.4 MHz) ≥85 db ≥40 dB
I.F. Rejection ( 10.7 MHz) ≥78 dB ≥65 dB
Pilot Suppression (60 dBµ) ≥60 dB ≥60 dB
THD (60 dBµ, L=R 75 kHz for AH, 40 kHz Dev for C)
Mono ≤0.25% ≤0.25%
Stereo ≤0.35% ≤0.35%
Auto-Search Sensitivity On ≥24 dBµ ≥24 dBµ
Off ≤15 dBµ ≤15 dBµ
RDS decode Sensitivity ≤26 dBµ ≤26 dBµ
PHYSICAL SPECIFICATIONS
Dimensions (Width x Height x Depth) 435 x 131 x 348mm
Net weight 12.27kg (27 lbs)
Shipping weight 13.63kg (30 lbs)

5
2
1
78
3 4 11 6 125
10 9 14 13
REAR PANEL / FRONT PANEL
REAR PANEL
FRONT PANEL
1. FM & AM ANTENNA
2. AM STEPPING FREQUENCY
3. TAPE 1 & CD INPUTS
4. 5.1 CHANNEL INPUTS
5. VIDEO 1 - VIDEO 4 (AUDIO & VIDEO) INPUTS
6. DIGITAL AUDIO INPUTS
7. AUDIO PRE-OUTS / SUBWOOFER OUT
8. MONITOR OUT
9. FRONT, CENTER & SURROUND SPEAKERS
10. SOFT CLIPPING
11. NAD-LINK INPUT/OUTPUT
12. SWITCHED POWER OUTLETS (*AH ONLY)
13. AC POWER CORD
14. COOLING FAN
1. POWER
2. STAND-BY
3. DISPLAY
4. FM MUTE / MODE
5. MEMORY
6. PRESET / TUNE
7. DOWN / UP AND
8. VFL DISPLAY
9. VOLUME
10. HEADPHONE SOCKET & VIDEO 5 INPUT
11. AUDIO & VIDEO INPUT SELECTORS & SURROUND
MODE
12. BASS & TREBLE CONTROLS
751

6
DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels.
Remove tapping screw 3.0 x 8.5 ( 7 ) from the back panel.
Refer to Figure No.1.
Figure No.1
2. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35˚ and then remove
in the direction as indicated by the arrow 9 . Refer to Figure No.2.
Figure No.2.
7
6
5
4
1
3
2
9
8
8

SURROUND
AMPLIFIER
PCB
AC OUTLET PCB
(*AH ONLY)
J708B
M001
C834
TRIGGER
PCB
FRONT
AMPLIFIER
PCB
AC3/DTS (DSP) PCB
VOLUME PCB
POWER SWITCH PCB
87
WIRING DIAGRAM
7012-5050-0

OSC RF
9
BLOCK DIAGRAM
DIR
CS-8414
DIG SW
74HC153
DSP
CS-4926
PSU
&
ISC
MONITOR
OUTPUT
VIDEO
INPUTS
DIGITAL
INPUTS
OSD
LC74763
2CH ADC
CS-5331 TC-9273
ANALOG
SWITCH
TUNER
SUBWOOFER
LA1837
LC7218
LC72723
VIDEO SWITCH
BA7625
(4cs)
DAC
CS4340
3pcs, 6ch tot
6CH
VOLUME
M62447SP
5CH
POWER
AMPLIFIER
MCU
LC87F65C8A
VFL DISPLAY NAD LINK
IN/OUT
REMOTE
SENSOR
KEY
MATRIX
MUTING 5.1CH
INPUT
EEPROM
VIDEO
OUTPUTS
AUDIO
INPUTS
AUDIO
OUTPUTS
10
ADJUSTMENT POINTS DIAGRAM
1. TUNER
2. IDLE CURRENT - Front Amplifier & Surround Amplifier Board

11
ALIGNMENT PROCEDURES
AMPLIFIER SECTION
Idle Current
Step Item Connection Adjustment Adjust for
1 Front Left Channel Voltmeter to P502 on Front Amp Board R574 2mV±0.2mV
2 Front Right Channel Voltmeter to P501 on Front Amp Board R573 2mV±0.2mV
3 Center Channel Voltmeter to P503 on Front Amp Board R599 2mV±0.2mV
4 Rear Left Channel Voltmeter to JP801 on Surround Amplifier Board R867 2mV±0.2mV
(PCB N0901C-AMP2)
5 Rear Right Channel Voltmeter to JP802 on Surround Amplifier Board R868 2mV±0.2mV
(PCB N091C-AMP2)
INSTRUMENT SETUP
1. FM MEASUREMENT
Fig. 1
Fig. 2
2. RDS MEASUREMENT
Fig. 3
3. AM MEASUREMENT
Fig. 4
FM
SIGNAL
GENERATOR
ANTENNA
TERMINAL
OUTPUT
TERMINAL
DISTORTION
ANALYZER
DISTORTION
ANALYZER
AC
VOLTMETER
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
OUTPUT
TERMINAL
OUTPUT
TERMINAL
L
R
ANTENNA
TERMINAL
ANTENNA
TERMINAL
ANTENNA
TERMINAL
AM LOOP
ANTENNA
(Accessory)
AM LOOP
ANTENNA
60cm
DIGITAL
MILLIVOLT
METER
VT-J914
FM
SIGNAL
GENERATOR
AM
SIGNAL
GENERATOR
FM
SIGNAL
GENERATOR
RDS
GENERATOR
FM
STEREO
GENERATOR
P-901
DC
MILLIVOLT
METER
UNIT
UNIT
UNIT
UNIT

12
IMPORTANT NOTES
1. Show the software version
Press “VIDEO 5” and “EXT 5.1”
and “DISPLAY”.
2. Toggle between PAL and NTSC
Press “MEMORY” and “VIDEO 1”.
3. Light UP all the icon on the VFL.
Press “VIDEO 1” and “EXT 5.1”
and “DISPLAY”.
4. Delete All Tuner Presets
a) Change the setting of
9kHz/10kHz AM step switch
and then switch on the unit.
b) Switch off the unit and put
back the 9kHz/10kHz AM step
switch to the right setting.
Then switch on the unit. (i.e.
9kHz=C ver., 10kHz=AH ver.)
FM/RDS SECTION
- FM mono: 1kHz, 75kHz devi., 60dB/µV
- FM stereo: 1kHz, 67.5kHz devi., 60dB/µV
Pilot signal 19kHz 7.5kHz devi.
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted.
Item
FM
IF/RF
Stereo
Distortion
Stereo
Separation
Muting
Level
Signal
output
Step
1DC voltmeter L941 0±100mV
3Distortion
analyzer
Distortion
analyzer
Oscilloscope
Oscilloscope
L942
R956
R941
Minimum
Minimum
2 AC voltmeter IFT on the
front end
IFT on the
front end
Maximum
Maximum
separation
Connection
of instrument
Fig.1 –
–
Fig.2
Fig.2
Fig.1
Channel L
or R 1kHz
99.0MHz
1kHz 75kHz devi.
65dBf (60dB)
99.0MHz Ext.
mod. 65dBf
(60dB)
FM SG
output
Stereo mod-
ulator output
Tuning
frequency
99.0MHz
99.0MHz
Channel L
or R 1kHz
99.0MHz Ext.
mod. 65dBf
(60dB)
99.0MHz Ext.
mod.65dBf(60dB)
RDS 2% MOD
99.0MHz 18dB
99.0MHz
99.0MHz
RDS –
––
–
Fig.3 99.0MHz
Output
indicator
Adjustment
point
Adjust
for Remarks
FM MUTE/MODE
switch: ON/AUTO
Repeat the steps
1 to 3 until no fur-
ther adjustment is
necessary.
FM MUTE/MODE
switch: ON/AUTO
Don’t turn more
than +/-180˚
Repeat stereo
distortion and
stereo separation
alignment until
THD at minimum
and separation at
maximum.
Decode the RDS-
Program Station.
AM SECTION
AM Modulation: 400Hz, 30%
For AH Version
Step
1–
2
3
530kHz
600kHz
990kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output
Tuning
frequency
Output
indicator
Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block L971
RF coil
on RF
block L971
Adjust
for
1.35±0.2V
Maximum
Maximum
Step
1–
2
3
522kHz
or
531kHz
603kHz
999kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output
Tuning
frequency
Output
indicator
Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block L971
RF coil
on RF
block L971
Adjust
for
1.3±0.2V (522kHz)
1.35±0.2V (531kHz)
Maximum
Maximum
For C Version

13
PCB LAYOUT
SPEAKER BOARD
DIGITAL BOARD
PRIMARY BOARD
SECONDARY BOARD
TONE BOARD

14
PSU BOARD
S-VIDEO BOARD
LED BOARD AC OUTLET BOARD

15
AC3 / DTS BOARD - COMPONENT SIDE
AC3 / DTS BOARD - SOLDER SIDE

16
MULTI-CHANNEL BOARD
MAIN BOARD

17
KEYBOARD - COMPONENT SIDE KEYBOARD - SOLDER SIDE

18
TRIGGER BOARD LOAD BOARD
FRONT AMPLIFIER BOARD
VIDEO 5 BOARD
VOLUME BOARD POWER SWITCH BOARD

19
SURROUND AMPLIFIER BOARD
TUNER BOARD
VIDEO BOARD AUDIO BOARD

20
SCHEMATIC DIAGRAM
(TO KEY J204A) (TO FRONT AMP J504A)
(TO SEC J702A)
LOAD
NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.
2. CERAMIC CAPACITORS ARE 50V +80/-20%. UNLESS OTHERWISE SPECIFIED.