Yamaha A-S201 User manual

P.O.Box 1, Hamamatsu, Japan
101294
SERVICE MANUAL
INTEGRATED AMPLIFIER
'13.12
A-S201
Copyright (c) Yamaha Corporation All rights reserved.
This manual is copyrighted by Yamaha and may not be copied or
redistributed either in print or electronically without permission.
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.
■CONTENTS
TO SERVICE PERSONNEL ............................................ 2
FRONT PANEL ...............................................................3
REAR PANELS ...........................................................3–5
REMOTE CONTROL PANEL ..........................................6
SPECIFICATIONS .......................................................6–7
INTERNAL VIEW ............................................................8
SERVICE PRECAUTIONS ..............................................8
DISASSEMBLY PROCEDURES ............................... 9–11
UPDATING FIRMWARE .......................................... 12–17
SELF-DIAGNOSTIC FUNCTION ............................ 18–27
DISPLAY DATA .............................................................28
IC DATA ...................................................................29–31
BLOCK DIAGRAM ........................................................32
WIRING DIAGRAM ....................................................... 33
PRINTED CIRCUIT BOARDS .................................34–39
PIN CONNECTION DIAGRAMS ...................................40
SCHEMATIC DIAGRAM ................................................41
REPLACEMENT PARTS LIST ................................43–49
REMOTE CONTROL .....................................................50
ADVANCED SETUP ......................................................51
A-S201

This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive
harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
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.
1. Critical Components Information
Components having special characteristics are marked ⚠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.
• Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 μF.
■TO SERVICE PERSONNEL
• Leakage current must not exceed 0.5mA.
• Be sure to test for leakage with the AC plug in both polarities.
WARNING: CHEMICAL CONTENT NOTICE!
All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder.
Among some types of lead free solder currently available, it is recommended to use one of the following types for the
repair work.
• Sn + Ag + Cu (tin + silver + copper)
• Sn + Cu (tin + copper)
• Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
As the melting point temperature of the lead free solder is about 30°C to 40°C (50°F to 70°F) higher than that of the lead
solder, be sure to use a soldering iron suitable to each solder.
About lead free solder
WALL
OUTLET EQUIPMENT UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
For U model
“CAUTION”
“F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A, 125V
FUSE.”
For C model
CAUTION
F1: REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 8A, 125V.
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■FRONT PANEL
T model
R model
■REAR PANELS
3
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B, G models
K model
A model
4
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L model
5
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■REMOTE CONTROL PANEL
RAS2 ■Audio Section
Minimum RMS Output Power (Power Amp. Section)
(40 Hz to 20 kHz, 0.2 % THD, 8 ohms / L/R drive)
R, K, A, B, G models .................................................100 W + 100 W
T, L models ...................................................................85 W + 85 W
Dynamic Power Per Channel (IHF) [R, K, A, B, G models]
8 / 6 / 4 / 2 ohms .......................................... 125 / 150 / 165 / 180 W
Maximum Power Per Channel (1 kHz, 0.7 % THD, 4 ohms)
[B, G models]
................................................................................................ 115 W
Maximum Effective Output Power (JEITA)
(1 kHz, 10 % THD, 8 ohms) [R, T, L models]
R model .................................................................................. 140 W
T, L models ............................................................................. 125 W
Input Sensitivity/Input Impedance (1 kHz, 100 W/8 ohms)
PHONO (MM) .................................................. 10.0 mV / 47 k-ohms
CD etc. .............................................................. 500 mV / 47 k-ohms
Output Level/Output Impedance
REC OUT ......................................................... 500 mV / 2.2 k-ohms
Headphone Jack Rated Output/Output Impedance
(1 kHz, 500 mV, 8 ohms load / CD etc. input)
........................................................................... 470 mV / 470 ohms
Frequency Response (CD etc.)
20 Hz to 20 kHz ................................................................ 0 ±0.5 dB
10 Hz to 100 kHz .............................................................. 0 ±3.0 dB
RIAA Equalization Deviation
PHONO (MM) ...................................................................... ±0.5 dB
Total Harmonic Distortion (20 Hz to 20 kHz)
PHONO (MM) to REC OUT (2 V) ..............................0.025 % or less
CD etc. to SP OUT (50 W/8 ohms) ...............................0.2 % or less
Signal to Noise Ratio (IHF-A Network)
PHONO (MM)
Input shorted 10 mV ............................................... 75 dB or more
CD etc. (PURE DIRECT on)
Input shorted 500 mV ........................................... 100 dB or more
Residual Noise (IHF-A Network)
................................................................................................. 70 μV
Tone Control Characteristics
Bass
Boost/Cut (50 Hz) ............................................................... ±10 dB
Turnover frequency .............................................................170 Hz
Treble
Boost/Cut (20 kHz) ............................................................. ±10 dB
Turnover frequency ............................................................ 3.0 kHz
■SPECIFICATIONS
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Unit: mm (inch)
■General
Power Supply
R model .......................................AC 110–120/220–240 V, 50/60 Hz
T model ................................................................... AC 220 V, 50 Hz
K model .................................................................. AC 220 V, 60 Hz
A model .................................................................. AC 240 V, 50 Hz
B, G models ............................................................ AC 230 V, 50 Hz
L model ...................................................... AC 220–240 V, 50/60 Hz
Power Consumption
R, K, A, B, G models ............................................................... 175 W
T, L models ............................................................................. 140 W
Standby Power Consumption [T, K, A, B, G, L models]
......................................................................................0.5 W or less
Dimensions (W x H x D)
............................... 435 x 141 x 333 mm (17-1/8" x 5-1/2" x 13-1/8")
Weight
................................................................................ 6.7 kg (14.8 lbs.)
Finish
R, T, K, A, B, G, L models ............................................... Black color
R, T, K, A, B, G, L models ................................................Silver color
Accessories
Remote control ..............................................................................x 1
Battery (LR6, AA, UM-3) ...............................................................x 2
*Specifications are subject to change without notice.
R.....................General model
T..................... Chinese model
K ......................Korean model
A .................Australian model
B.......................British model
G..................European model
L..................Singapore model
•DIMENSIONS
Front view
21
(7/8")
435 (17-1/8")
141 (5-1/2")
120 (4-3/4")
Top view
20.5
(3/4")
22.5 (7/8")
333 (13-1/8")
290 (11-3/8")
55
(2-1/8")
45 (1-3/4")
190 (7-1/2")
ø 60
335 (13-1/4")50
(2")
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■INTERNAL VIEW
■SERVICE PRECAUTIONS
Safety measures
• Some internal parts in this product contain high voltages and are dangerous.
Be sure to take safety measures during servicing, such as wearing insulating gloves.
• Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge
remains and a high voltage continues to exist there.
Before starting any repair work, connect a discharging resistor (5 k-ohms/10 W) to the terminals of each capacitor
indicated below to discharge electricity.
The time required for discharging is about 30 seconds per each.
C140, C143, C149 and C150 on MAIN (1) P.C.B.
For details, refer to “PRINTED CIRCUIT BOARDS”.
MAIN (5) P.C.B. (R model)
MAIN (1) P.C.B.
MAIN (8) P.C.B.
MAIN (7) P.C.B.
POWER TRANSFORMER
MAIN (6) P.C.B.
MAIN (3) P.C.B.
MAIN (2) P.C.B.
MAIN (4) P.C.B.
Top view
Front view
4
879
53
6
1
2
3
4
5
6
7
8
9
21
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(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Top Cover
a. Remove screw (①), 4 screws (②) and 6 screws (③). (Fig. 1)
b. Remove the top cover. (Fig. 1)
2. Removal of Front Panel Unit
a. Remove screw (④) and 6 screws (⑤). (Fig. 1)
b. Remove screw (⑥) and then remove W501. (Fig. 1)
c. Remove CB102, CB204 and CB502. (Fig. 1)
d. Release 2 hooks and then remove the front panel unit. (Fig. 1)
Fig. 1
■DISASSEMBLY PROCEDURES
Front panel unit
Top cover
CB102
CB502
CB204
MAIN (2) P.C.B. MAIN (1) P.C.B.
MAIN (6) P.C.B.
Hook
Hook
①
④
④
⑤
⑤
②
②
③
⑤
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Fig. 3
Fig. 2
3. Removal of AMP Unit
a. Remove 12 screws (⑦). (Fig. 3)
b. Remove 4 screws (⑧) and screw (⑨). (Fig. 2)
c. Remove CB4, CB7 and CB103. (Fig. 2)
d. Remove the AMP unit. (Fig. 2)
AMP unit
CB4
CB7
CB103
MAIN (1) P.C.B.
⑧
⑧
⑧⑨
Rear view
⑦
⑦
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Fig. 4
When checking the MAIN (1) P.C.B.:
• Place the P.C.B.s (with rear panel) upright. (Fig. 4)
• Connect the heatsink and rear panel to the chassis with a ground lead or the like. (Fig. 4)
• Reconnect all cables (connectors) that have been disconnected.
• When connecting the flexible flat cable, be careful with polarity.
Rear panel
Chassis
Heatsink
MAIN (1) P.C.B.
Ground lead
Ground lead
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When the following parts are replaced, the firmware must be updated to the latest version.
MAIN P.C.B.
Microprocessor: IC203 on FUNCTION (1) P.C.B.
●Confirmation of firmware version and checksum
Before and after updating the firmware, check the firmware version and checksum by using the self-diagnostic
function menu.
Start up the self-diagnostic function and select “1. FIRMWARE VERSION/CHECK SUM” menu.
Using the sub-menu, have the firmware version and checksum displayed, and note them down.
(For details, refer to “SELF-DIAGNOSTIC FUNCTION”)
*When the firmware version is different from written one after updating, perform the updating procedure again from
the beginning.
●Initializing the back-up IC
Start up the self-diagnostic function and select “3. FACTORY PRESET” menu.
(For details, refer to “SELF-DIAGNOSTIC FUNCTION”)
Select “PRST RSRV”, press the “ ” (Power) key to turn off the power once and turn on the power again. Then the back-
up IC is initialized.
■UPDATING FIRMWARE
●Required Tools
• Firmware downloader program
................................................................RFP.exe
• Firmware
................................................. AS_201_xxx.mot
• RS-232C conversion adaptor (Part No.: ZK189200)
• Flexible flat cable
(9 pin 150 mm pitch = 1.25, Part No.: ZD896000)
• USB to Serial converter
(USB type-A to D-sub 9 pin)
*Recommendation: BUFFALO
(Part No.: BSUSRC0605BS)
FTDI Ltd.
(Part No.: DS-US232R-10)
●Preparation and precautions
• Download the firmware downloader program and
the latest firmware from the specified download
source to the same folder of the PC.
• Prepare the above specified RS-232C cross cable.
• While writing the firmware, keep the other
application software on the PC closed.
It is also recommended to keep the software on
the task tray closed as well.
After updating the firmware, the back-up IC MUST be initialized by the following procedure to store the setting
information properly.
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USB port
USB cable
PC
This unit
RS-232C conversion adaptor
Flexible flat cable (9P)
Writing port
(CB201 on MAIN (1) P.C.B.)
●Connection
*Disconnect the power cable of this unit from the AC outlet.
• Connect the writing port (CB201 on MAIN (1) P.C.B.) located on the rear panel of this unit to the USB port of the PC
with USB to serial converter, RS-232C conversion adaptor and flexible flat cable as shown below. (Fig. 1)
Fig. 1
●Operation procedure
1. Connect the power cable of this unit to the AC outlet.
The power to this unit is supplied and the microprocessor is in the writing mode.
2. Start up RFP.exe.
The screen appears as shown below. (Fig. 2)
3. Select the Basic mode and click [Next]. (Fig. 2)
Fig. 2
Select Basic mode
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4. Select the type of the microprocessor and make the workspace. (Fig. 3)
• Microcontroller: RL78
• Using Target Microcontroller: RL78/G13, R5F100JE
• Workspace Name: Any name
• Project Name: Any name
• Folder: Any place
*Click [Browse…] and specify the place where the workspace is made. (Fig.3)
5. Click [Next]. (Fig. 3)
Fig. 3
RL78
RL78/G13, R5F100JE
Workspace Name
Project Name
Folder
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6. Select COMx with the Tool and click [Next]. (Fig. 4)
*Do not proceed to other settings until clicking [Next] is completed. (Fig. 4)
7. Make the port (COMx) setting. (Fig. 5)
a. Access the device manager. (Fig. 5)
*To access the device manager, click [Start], [Control panel], [System], [Hardware] and [Device manager] in
this order.
b. Right click the communication port (COMx) of the port (COM and LPT) to open the property. (Fig. 5)
*COMx: Enter the port number of the PC to which the USB to serial converter is connected in place of “x”.
c. Using the port setting function, set the Bit/second to “115200”. (Fig. 5)
8. Click [OK]. (Fig. 5)
Fig. 4
Fig. 5
Tool: COMx
115200
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9. Click [Browse...] and select the firmware name. (Fig. 6)
10. Click [Start] to start writing. (Fig. 6)
Fig. 6
Writing being executed.
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13. Disconnect the power cable of this unit from the AC outlet.
14. Remove the RS-232C conversion adaptor and flexible flat cable from the writing port (CB201 on MAIN (1) P.C.B.) of
this unit.
15. Connect the power cable of this unit to the AC outlet, start up the self-diagnostic function and check that the
firmware version and checksum are the same as written ones. (For details, refer to “Confirmation of firmware
version and checksum”)
11. When writing of the firmware is completed, the screen appears as shown below. (Fig. 7)
12. Click [X] to end RFP.exe. (Fig. 7)
Fig. 7
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This unit has self-diagnostic functions that are intended for inspection, measurement and location of faulty point.
There are 6 main menu items, each of which has sub-menu items.
Listed in the table below are main menu items and sub-menu items.
Note: Some of the menu items listed below may not apply to the models covered in this service manual.
■SELF-DIAGNOSTIC FUNCTION
No. Main menu No. Sub-menu
1 FIRMWARE VERSION/CHECK SUM 1 FIRMWARE VERSION
2 FIRMWARE CHECKSUM
3 MODEL/DESTINATION
2 DISPLAY CHECK 1 VFD CHECK
2 ALL SEGMENT OFF
3 ALL SEGMENT ON
3 FACTORY RESET 1 PRESET INHIBIT
2 PRESET RESERVE
4 AD DATA CHECK 1 PS
2DC
3TA
4 DESTINATION
5 KEY
5 PROTECTION HISTORY 1 HISTORY 1
2 HISTORY 2
3 HISTORY 3
4 HISTORY 4
6 POWER OFF FACTOR HISTORY 1 LAST
2 HISTORY 1
3 HISTORY 2
4 HISTORY 3
5 HISTORY 4
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While pressing these keys, turn on the power.
“ ” (Power) indicator
“ ” (Power) key
CAUTION!
Using this unit with the protection function disabled may cause further damage to this unit. Use special care for this point
when using this mode.
●Starting Self-Diagnostic Function in the protection cancel mode
If the protection function works and causes hindrance to troubleshooting, cancel the protection function by the procedure
below, and it will be possible to enter the self-diagnostic function mode. (The protection functions other than the excess
current detect function will be disabled.)
While pressing the “BASS +” and “SPEAKERS A” keys, press the “ ” (Power) key to turn on the power and keep pressing
those 2 keys and “ ” (Power) key for 3 seconds or longer.
The self-diagnostic function mode is activated with the protection functions disabled.
In this mode, the “SLEEP” segment of the FL display flashes to indicate that the mode is self-diagnostic function mode with
the protection functions disabled.
●Starting Self-Diagnostic Function
While pressing the “BASS +” and “SPEAKERS A” keys, press the “ ” (Power) key to turn on the power, and release those 2
keys.
The self-diagnostic function mode is activated.
Keys of this unit
●Canceling Self-Diagnostic Function
1. Before canceling self-diagnostic function, execute setting for “3. FACTORY PRESET” menu. (Memory initialization
inhibited or Memory initialized).
*In order to keep the user memory preserved, be sure to select PRESET INHIBIT (Memory initialization inhibited).
2. Press the “ ” (Power) key to turn off the power.
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Main menu displayOpening message
After a few seconds
●Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation when the power to this unit is turned off.
1. When the power is turned off by usual operation:
“NO PROTECT” is displayed. Then “1. VERSION/SUM” is displayed in a few seconds.
Display: The Power indicator is flashing.
Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power amplifier is detected, the abnormal channel can be identified by
checking the current detect transistor.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the
power supply will instantly be shut off.
Notes:
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional
circuit damage. To avoid this, if protection function due to excess current works 1 time, the power will not turn
on even when the “ ” (Power) key is pressed. In order to turn on the power again, disconnect the power cable
of this unit from the AC outlet once and then reconnect it again.
• The output transistors in each amplifier channel should be checked for damage before applying power to this unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each channel.
2. When the protection function worked to turn off the power:
The information of protection function which worked at that time is displayed. Then “1. VERSION/SUM” is displayed in
a few seconds.
Note: At that time if you restart the self-diagnostic function after turning off the power once, “NO PROTECT” will be
displayed. That is because that situation is equal to “1. When the power is turned off by usual operation:”.
However history of the protection function is stored in memory as backup data. For details, refer to “5.
PROTECTION HISTORY” menu.
2-1. When there is a history of protection function due to excess current.
NOPRT
IPRT
VERA11U
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