Yamaha serwisowka_RX-777.pdf

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STEREO RECEIVER
RX-777
SERVICE MANUAL
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.
WARNING:
Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized
YAMAHA Retailer or the appointed service representative.
IMPORTANT:
The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and
service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable
and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please
contact the distributor's Service Division.
WARNING:
Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT:
Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
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CONTENTS
TO SERVICE PERSONNEL .......................................... 1
IMPEDANCE SELECTOR ............................................. 1
REAR PANELS .............................................................. 2
SPECIFICATIONS .......................................................... 3
INTERNAL VIEW ........................................................... 4
DISASSEMBLY PROCEDURES ................................... 5
OPERATION P.C.B. CHECK ......................................... 5
AMP ADJUSTMENTS .................................................... 6
TEST MODE ................................................................... 6
DISPLAY DATA ............................................................. 8
IC DATA ................................................................... 9~10
PRINTED CIRCUIT BOARD .................................. 11~22
BLOCK DIAGRAM ................................................. 23~24
SCHEMATIC DIAGRAM ........................................ 25~28
PARTS LIST ........................................................... 29~38
REMOTE CONTROL TRANSMITTER ........................ 39
RX-777
100749
P.O.Box 1, Hamamatsu, Japan
RX-777
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TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked
Z
and must be replaced with parts having specifications equal
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
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WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
Leakage current must not exceed 0.5mA.
Be sure to test for leakage with the AC plug in both polarities.
INSULATING
TABLE
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WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
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IMPEDANCE SELECTOR
IMPEDANCE SELECTOR
RX-777
WARNING:
Do not change the IMPEDANCE SELECTOR
switch setting while the power to this unit is
on, otherwise this unit may be damaged.
1
RX-777
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REAR PANELS
U model
C model
A model
RX-777
2
RX-777
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SPECIFICATIONS
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AUDIO SECTION
Minimum RMS Output Power (Power Amp. Section)
8 ohms, 20 Hz to 20 kHz, 0.019% THD ................. 100W + 100W
6 ohms, 20 Hz to 20 kHz, 0.03% THD ................... 120W + 120W
Dynamic Power Per Channel (IHF)
8/6/4/2 ohms .................................................. 140/170/220/290 W
Power Band Width
8 ohms, 50W, 0.03% THD ................................... 10 Hz to 50 kHz
Damping Factor
8 ohms, 20 Hz to 20 kHz, SPEAKER-A .................... 240 or more
Input Sensitivity / Input Impedance
PHONO MM ................................................... 2.5 mV / 47 k-ohms
CD, etc. ......................................................... 150 mV / 47 k-ohms
MAIN IN ................................................................ 1 V / 30 k-ohms
Maximum Input Signal Level
PHONO MM (1 kHz, 0.015% THD) .................................. 115 mV
CD, etc. (1 kHz, 0.015% THD) ............................................. 2.2 V
Output Level / Output Impedance
PRE OUT ............................................................ 1 V / 1.2 k-ohms
REC OUT (PHONO) .................................... 150 mV / 1.7 k-ohms
Headphone Jack Rated Output / Impedance
0.015% THD, 8 ohms, 1 kHz, 150 mV ............ 0.47 V / 470 ohms
Frequency Response
CD, etc. (20 Hz to 20 kHz) .............................................. 0±0.5 dB
MAIN IN (20 Hz to 20 kHz) ............................................. 0±0.5 dB
CD (CD DIRECT AMP ON, 20 Hz to 100 kHz) .............. 0±1.0 dB
RIAA Equalization Deviation
PHONO MM (20 Hz to 20 kHz) .................................... 0
±
0.5 dB
Total Harmonic Distortion
(20 Hz to 20 kHz)
PHONO MM, to REC OUT (3 V) ........................... 0.008% or less
CD, etc. to PRE OUT (1 V) .................................... 0.007% or less
CD, etc. to SP OUT (50 W / 8 ohms) .................... 0.012% or less
Signal to Noise Ratio (IHF-A network)
PHONO MM (5 mV Input shorted) ......................... 87 dB or more
CD (CD DIRECT AMP ON, 150 mV Input shorted) .... 110 dB or more
Residual Noise (IHF-A network)
CD DIRECT AMP ON .......................................................... 30
µV
PURE DIRECT ON ............................................................ 110
µV
Channel Separation
CD, etc. (Input 5.1 k-ohms shorted, 1 kHz) ............ 65 dB or more
CD, etc. (Input 5.1 k-ohms shorted, 10 kHz) .......... 50 dB or more
Tone Control Characteristics
Bass: Boost/Cut ................................................
±10
dB (20 Hz)
Turnover Frequency ............................................ 350 Hz
Treble: Boost/Cut ..............................................
±10
dB (20 kHz)
Turnover Frequency ........................................... 3.5 kHz
Continuous Loudness Control
Attenuation, 1 kHz ............................................................... -30 dB
Gain Tracking Error
0 to -60 dB .................................................................. 2 dB or less
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AM Section
Tuning Range
[U, C models] ..................................................... 530 to 1,710 kHz
[A model] ............................................................ 531 to 1,611 kHz
Usable Sensitivity
........................................................................................ 300
µV/m
Antenna
................................................................................. Loop Antenna
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Video Section
Video Signal Type
[U, C models] ....................................................................... NTSC
[A model] ................................................................................. PAL
Video Signal Level
............................................................................ 1 Vp-p / 75 ohms
Maximum Input Level
.......................................................................................... 1.5 Vp-p
Signal to Noise Ratio
................................................................................. 50 dB or more
Monitor Out Frequency Response
.................................................................... 5 Hz to 10 MHz, -3 dB
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General
Power Supply
[U, C models] ...................................................... AC 120 V, 60 Hz
[A model ] ............................................................ AC 240 V, 50 Hz
Power Consumption
[U model] ............................................................................. 260 W
[C model] ............................................................................. 210 W
[A model] ............................................................................. 200 W
Standby Power Consumption
[U, C models] ....................................................................... 0.9 W
[A model] .............................................................................. 1.0 W
AC Outlets
[U, C models]
2 switched outlets ............................................... 100W max. total
[A model]
1 switched outlet ......................................................... 100W max.
Dimensions (W x H x D)
................. 435 x 151 x 390.3 mm (17-1/8" x 5-15/16" x 15-5/16")
Weight
.................................................................... 9.8 kg (21 lbs. 10 oz.)
Finish
...................................................................................... Black color
Accessories
..................................................... Remote control transmitter x 1,
Manganese batteries (size "AA", "R06") x 2,
Indoor FM antenna x 1,
AM loop antenna x 1
* Specifications are subject to change without notice.
U .......... U.S.A. model
A .......... Australian model
C ...... Canadian model
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FM Section
Tuning Range
[U, C models] ................................................... 87.5 to 107.9 MHz
[A model] ...................................................... 87.50 to 108.00 MHz
50 dB Quieting Sensitivity (IHF)
(1 kHz, 100% Mod.)
Mono .................................................................. 2.0
µV
(17.3 dBf)
Stereo .................................................................. 25
µV
(39.2 dBf)
Usable Sensitivity (IHF)
Mono .................................................................. 1.0
µV
(11.2 dBf)
Selectivity
at 400 kHz ............................................................................ 70 dB
Signal to Noise Ratio (IHF)
Mono / Stereo .......................................................... 76 dB / 70 dB
Harmonic Distortion
(1 kHz)
Mono / Stereo .............................................................. 0.2 / 0.3 %
Stereo Separation
1 kHz .................................................................................... 45 dB
Frequency Response
20 Hz to 15 kHz .......................................................... +0.5 / -2 dB
Antenna Input
...................................................................... 75 ohms unbalanced
RX-777
3
RX-777
130 (5-1/8")
435 (17-1/8")
Unit : mm (inch)
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INTERNAL VIEW
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MAIN (5) P.C.B.
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MAIN (2) P.C.B.
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MAIN (3) P.C.B.
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MAIN (1) P.C.B.
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INPUT (4) P.C.B.
y
INPUT (1) P.C.B.
u
INPUT (2) P.C.B.
i
INPUT (3) P.C.B.
o
OPERATION (8) P.C.B.
!0
OPERATION (1) P.C.B.
!1
OPERATION (6) P.C.B.
!2
MAIN (4) P.C.B.
!3
OPERATION (4) P.C.B.
!4
OPERATION (5) P.C.B.
!5
OPERATION (2) P.C.B.
!6
OPERATION (3) P.C.B.
21
(13/16")
151 (5-15/16")
21
(13/16")
390.3 (15-5/16")
348 (13-11/16")
21.3
(13/16")
• DIMENSIONS
RX-777
!0 !1 !2
!3
!4
!5
!6
4

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