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STEREO AMPLIFIER

A-S2000 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.




A-S2000
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2 SELF-DIAGNOSTIC FUNCTION
FRONT PANEL .............................................................. 2 28­30
REAR PANELS .......................................................... 3­5 IC DATA ................................................................. 31­34
REMOTE CONTROL PANELS ...................................... 6 PIN CONNECTION DIAGRAMS ............................ 35­36
SPECIFICATIONS / .......................................... 7 BLOCK DIAGRAM ....................................................... 37
INTERNAL VIEW ........................................................... 8 PRINTED CIRCUIT BOARDS ................................ 38­58
SERVICE PRECAUTIONS SCHEMATIC DIAGRAMS ...................................... 59­66
.................................................... 9 REPLACEMENT PARTS LIST .............................. 67­87
DISASSEMBLY PROCEDURES ............. 9­18 REMOTE CONTROL .............................................. 88­89
AMP ADJUSTMENT ....................... 19­20
UPDATING FIRMWARE
..................................... 21­27




101077 2008 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
P.O.Box 1, Hamamatsu, Japan
'08.01
A-S2000



I TO SERVICE PERSONNEL AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT TESTER OR
Components having special characteristics are marked s OUTLET UNDER TEST EQUIVALENT
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 INSULATING
TABLE
from supply circuits.
G Meter impedance should be equivalent to 1500 ohms shunted G Leakage current must not exceed 0.5mA.
by 0.15µF. G Be sure to test for leakage with the AC plug in both polarities.



WARNING: CHEMICAL CONTENT NOTICE!
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 WHAT SO EVER!
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.


About lead free solder /
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
A-S2000




solder, be sure to use a soldering iron suitable to each solder.




I FRONT PANEL
A-S2000 (U, C, R, T, K, A, B, G, L, J models)




2
A-S2000



I REAR PANELS
A-S2000 (U, C models)




A-S2000 (R model)




A-S2000 (T model)




A-S2000




3
A-S2000




A-S2000 (K model)




A-S2000 (A model)




A-S2000 (B model)
A-S2000




4
A-S2000




A-S2000 (G model)




A-S2000 (L model)




A-S2000 (J model)




A-S2000




5
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I REMOTE CONTROL PANELS
RAS21 RAS22
(U, C, R, T, A, B, G, L models) (K, J models)
A-S2000




6
A-S2000



I SPECIFICATIONS /
I Audio Section / I General /
Minimum RMS Output Power (Power Amp. Section) / Power Supply /
(20 Hz to 20 kHz, 0.02 % THD) U, C models ........................................................... AC 120 V, 60 Hz
8 ohms ......................................................................... 90 W + 90 W R, L models .......................... AC 110/120/220/230-240 V, 50/60 Hz
4 ohms .................................................................... 150 W + 150 W T model .................................................................. AC 220 V, 50 Hz
K model .................................................................. AC 220 V, 60 Hz
Dynamic Power / (IHF)
A model .................................................................. AC 240 V, 50 Hz
8/6/4/2 ohms ..................................................... 105/135/190/220 W
B, G models ........................................................... AC 230 V, 50 Hz
Maximum Output Power [B, G models] (1 kHz, 0.7 % THD, 4 ohms) J model ............................................................ AC 100 V, 50/60 Hz
............................................................................................... 160 W
Power Consumption
Maximum Useful Output Power (JEITA) [R, T, K, L models] U, C, R, T, K, A, B, G, L models ........................................... 350 W
(1 kHz, 10 % THD) J model .................................................................................. 220 W
8 ohms ................................................................................... 120 W
Idling Power Consumption
4 ohms ................................................................................... 190 W
................................................................................................. 80 W
Dynamic Headroom /
Off-state Power Consumption
8 ohms ................................................................................. 0.67 dB
................................................................................................... 0 W
IEC Output Power [B, G models] (1 kHz, 0.02 % THD)
8 ohms ..................................................................................... 95 W Dimensions (W x H x D)
4 ohms ................................................................................... 155 W .......................... 435 x 137 x 465 mm (17-1/8" x 5-3/8" x 18-5/16")
Damping Factor / (1 kHz, 8 ohms) Weight
.................................................................................................... 160 ............................................................................... 22.7 kg (50 lbs.)
Maximum Input Signal / Finish
CD, etc. .................................................................................... 2.8 V Black color ................................ U, C, R, T, K, A, B, G, L, J models
PHONO (1 kHz) MM ........................................................... 120 mV Silver color ................................ U, C, R, T, K, A, B, G, L, J models
MC ................................................................ 7 mV Accessories
Frequency Response / Remote control x 1, Battery (R6, AA, UM-3) x 2, Power cable (2 m) x 1
CD, etc.
Flat position, 5 Hz to 100 kHz .................................... +0 / -3.0 dB * Specifications are subject to change without notice due to product
Flat position, 20 Hz to 20 kHz .................................... +0 / -0.3 dB improvements.
RIAA Equalization Deviation / (20 Hz to 20 kHz)
PHONO MM ........................................................................ ±0.5 dB
U .......... U.S.A. model A .......... Australian model
MC ......................................................................... ±0.5 dB C .......... Canadian model B .......... British model
Total Harmonic Distortion / (20 Hz to 20 kHz) R .......... General model G .......... European model
CD BAL to SP OUT (90 W, 8 ohms) .................................... 0.01 % T .......... Chinese model L .......... Singapore model
CD, etc. to SP OUT (90 W, 8 ohms) .................................. 0.015 % K .......... Korean model J ........... Japanese model
PHONO MM (2 V, to REC) ................................................ 0.005 %
MC (2 V, to REC) ................................................... 0.05 %
· DIMENSIONS /
Intermodulation Distortion / (Rated output, 8 ohms)




(1")
25
CD, etc. to SP OUT .............................................................. 0.02 %
Signal to Noise Ratio / (IHF-A Network) (Input shorted)
CD, etc. (150 mV) ................................................................... 98 dB
PHONO MM (5 mV) ............................................................... 93 dB
MC (500 µV) ............................................................. 85 dB




A-S2000
Residual Noise / (IHF-A Network)
FRONT L/R SP OUT .................................................. 33 µV or less

I Control Section /

465 (18-5/16")
418 (16-7/16")
Input Sensitivity/Input Impedance /
CD, etc. .............................................................. 150 mV/47 k-ohms
PHONO MM ....................................................... 2.5 mV/47 k-ohms
MC ........................................................... 100 µV/50 ohms
MAIN IN .................................................................... 1 V/47 k-ohms
Output Level/ Output Impedance /
REC OUT .......................................................... 150 mV/1.5 k ohms
PRE OUT ................................................................. 1 V/1.5 k ohms
Headphone Rated Output /
1 kHz, 0.2 % THD, 32 ohms ................................................. 30 mW
Channel Separation / (1 kHz/10 kHz)
22
(7/8")




CD, etc. (5.1 k-ohms terminated) ......................... 74/54 dB or more
PHONO (Input shorted, Vol: -30 dB) MM ........... 90/77 dB or more
MC ............ 66/77 dB or more
121 (4-3/4")

137 (5-3/8")




Tone Control Characteristics /
BASS
Boost/Cut (50 Hz) ................................................................ ±9 dB
Turnover frequency ............................................................ 350 Hz
TREBLE
(5/8")
3
(1/8")
16




Boost/Cut (20 Hz) ................................................................ ±9 dB 435 (17-1/8")
Turnover frequency ........................................................... 3.5 kHz
Audio Muting / Unit: mm (inch)
............................................................................... -20 dB (approx.)
7
A-S2000



I INTERNAL VIEW
Top View
1 2 3 4 5 6 7 8 9 0 1 FRONT (14) P.C.B. (R, L models)
2 FUNCTION (3) P.C.B.
3 FRONT (13) P.C.B.
4 MAIN (2) P.C.B.
5 FUNCTION (2) P.C.B.
6 POWER TRANSFORMER
7 MAIN (3) P.C.B.
8 MAIN (1) P.C.B.
9 FRONT (12) P.C.B.
0 FRONT (11) P.C.B.
A FRONT (9) P.C.B.
B FRONT (2) P.C.B.
C FRONT (1) P.C.B.
D FRONT (3) P.C.B.
E FRONT (6) P.C.B.
F FRONT (5) P.C.B.
G FRONT (4) P.C.B.
H FRONT (7) P.C.B.
I FRONT (8) P.C.B.
Front View J BALANCE P.C.B.
A B C D EF G K FUNCTION (1) P.C.B.
L FRONT (10) P.C.B.




I H
Rear View
J K L
A-S2000




8
A-S2000



I SERVICE PRECAUTIONS /
Safety measures * When installing the knob unit, it is necessary to position
· Some internal parts in this product contain high volt- them as specified. (Refer to "When installing the knob
ages and are dangerous. Be sure to take safety mea- unit".)
sures during servicing, such as wearing insulating
gloves.
· Note that positions indicated below are dangerous even
Panel side L
after the power is turned off because an electric charge
Top cover
remains and a high voltage continues to exist there.
Before starting any repair work, perform discharge by Hook
connecting a discharge resistor (5k-ohms/10W) be- Coned disc spring L
tween terminals at following positions. The time re-
quired for discharging is about 30 seconds.
1 4
1. C308 on MAIN (3) P.C.B.. 5
2. C309 on MAIN (3) P.C.B.. 3
3. C335 on MAIN (3) P.C.B..
4. C336 on MAIN (3) P.C.B.. Hook
Refer to "PRINTED CIRCUIT BOARDS: MAIN (3) P.C.B.".
Washer side

3 Panel side R
POWER ON / OFF switch


I DISASSEMBLY PROCEDURES / 6
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.

1. Removal of Panel Side L/R Hook
a. Remove 2 screws (1), 2 coned disc spring L and 2 1
washers side. (Fig. 1)
b. Lift the panel side L a little and release 3 hooks. Then
remove the panel side L. (Fig. 1) PHONO ON / OFF switch Coned disc spring L
6
c. Remove 2 screws (2), 2 coned disc spring L and 2 2
washers side. (Fig. 1)
2
d. Lift the panel side R a little and release 3 hooks. Then Knob TC unit Front panel Washer side
remove the panel side R. (Fig. 1)
Lock set screw 2mm
2. Removal of Top Cover Knob SEL unit

a. Remove 7 screws (3), 2 screws (4) and 2 screws 3 4 5
(5). (Fig. 1) Knob VOL unit
b. Remove the top cover. (Fig. 1)

3. Removal of Front Panel
Hexagonal wrench
* Prepare a hexagonal wrench (2 mm) for removal of
knob unit.
a. Loosen lock set screw to remove the knob VOL unit. Fig. 1
(Fig. 1)
b. Loosen lock set screw to remove the knob SEL unit.
(Fig. 1)
c. Loosen each lock set screw to remove 3 knob TC unit.
(Fig. 1)
d. Remove 8 screws (6). (Fig. 1) 6
e. Set the "POWER ON/OFF" switch to the ON position.
f. Set the "PHONO MM/MC" switch to the MM position.
g. Remove the front panel forward gradually using care
not to cause damage the switches. (Fig. 1)


9
A-S2000




G When installing the knob VOL unit: e. After installation, perform following checks.
a. Turn the VOLUME (VR501) counterclockwise · Turn the knob TC unit in both directions to
fully. (Fig. 2) check that it does not rub against the front
b. Match the slit in the knob VOL unit with the panel.
"VOLUME MIN" position and install it in that · Turn the knob TC unit counterclockwise
state. (Fig. 2) fully and check that the slit in it matches with
the "BALANCE L" position.
* At this time, do not tighten the lock set screw.
· Turn the knob TC unit clockwise fully and
c. Keep about 0.5 mm to 0.75 mm clearance from check that the slit in it matches with the
the front panel to knob VOL unit. (Fig. 2) "BALANCE R" position.
d. Match the lock set screw position with the cut in
VOLUME (VR501) and tighten the lock set screw.
e. After installation, perform following checks.
· Turn the knob VOL unit both directions to
check that it does not rub against the front
panel.
· Turn the knob VOL unit clockwise fully and
0.5­0.75mm
check that the slit in it matches with the
"VOLUME MAX" position.
· Turn the knob VOL unit counterclockwise
fully and check that the slit in it matches with Front panel
the "VOLUME MIN" position.
Center position of BALANCE Lock set screw

G When installing the knob SEL unit:
Cut
a. Turn the INPUT (SW501) so that the cut in it SW501
VR504
comes at the top. (Fig. 2)
b. Install the knob SEL unit with its lock set screw
positioned at the top. (Fig. 2) Lock set screw
* At this time, do not tighten the lock set screw.
c. Keep about 0.5 mm to 0.75 mm clearance from
the front panel to knob SEL unit. (Fig. 2)
d. Match the lock set screw position with the cut in
INPUT (SW501) and tighten the lock set screw.
e. After installation, perform following checks. VR501
· Turn the knob SEL unit in both directions to
check that it does not rub against the front
panel.

G When installing the knob TC unit
* Use the same installation procedure for BASS,
TREBLE and BALANCE.
Described here is installation of BALANCE as
an example. Knob TC unit
Lock set screw
a. Turn the BALANCE (VR504) in both directions
VOLUME MAX
and set it to the center position. (Fig. 2) VOLUME MIN
* VR504 stops at the center position when it is
Slit Knob VOL unit
turned in both directions. Knob SEL unit
b. Match the slit in the knob TC unit with the center
position of BALANCE and install it in that state.
(Fig. 2) Fig. 2
* At this time, do not tighten the lock set screw.
c. Keep about 0.5 mm to 0.75 mm clearance from
the front panel to knob TC unit. (Fig. 2)
d. Tighten the lock set screw of the knob TC unit.
(Fig. 2)
10
A-S2000




4. Removal of Front Frame Ass'y
a. Remove 4 screws (7) to remove the frame top. (Fig. 3) 7
b. Remove 8 screws (8). (Fig. 3)
c. Remove CB501, CB504, CB517, CB519, CB521 and 8
SW1-2. (Fig. 3)
d. Remove the front frame ass'y. (Fig. 3)




Frame top 7




7




Front frame ass'y




8




Front frame ass'y
CB519 CB517 CB521 SW2
8




A-S2000
8




CB501 CB504 SW1


Fig. 3




11
A-S2000




When checking the P.C.B.:
· Put the rubber sheet and cloth over this unit. Then
place the P.C.B.s upside down on the cloth and
check it. (Fig. 4)
· Reconnect all cables (connectors) that have been
disconnected.
· In this unit, the ground of the front frame ass'y is con-
nected to the chassis. When the front frame ass'y is
removed from the chassis, connect the ground point
to the chassis, using a ground lead wire or the like.
(Fig. 4)




Rubber sheet and cloth




Ground lead

Front frame ass'y




Fig. 4
A-S2000




12
A-S2000




5. Removal of Amplifier Unit
a. Remove 8 screws (9) and 2 screws (0). (Fig. 5) 9 0
b. Remove the frame side L. (Fig. 5)
c. Remove 4 screws (A). (Fig. 5) A
d. Remove CB71-74, CB76, CB84 and CB406. (Fig. 5)
e. Remove the amplifier unit L together with the heat sink.
f. Remove 4 screws (B) and 4 screws (C). (Fig. 5)
g. Remove CB52, CB54, CB64 and CB405. (Fig. 5) B C
h. Remove the amplifier unit R together with the heat
sink.



9
Frame side L

CB21
CB26 E
A
9
CB72
E
CB71
9 A
0


CB22
CB406
CB24
CB74 CB405
CB84 POWER unit
CB76
CB73
AMP unit L CB25
CB34

C
B

Bottom cover CB52
C
B




A-S2000
CB54


D CB64
Leg
D
Leg
AMP unit R

D
D
D


Fig. 5



6. Removal of Power Unit
a. Remove 4 legs. (Fig. 5)
b. Remove 18 screws (D). (Fig. 5) D
c. Remove the bottom cover. (Fig. 5)
d. Remove 4 screws (E). (Fig. 5) E
e. Remove CB21-22, CB24-26 and CB34. (Fig. 5)
f. Remove the power unit. (Fig. 5)
13
A-S2000




G When installing the power unit:
When installing the power unit, be very careful not
to cause any damage to the cable at the bottom
with the end of the screw. (Fig. 6)




Bottom view Cable
Front side




End of the screw




Rear side


Fig. 6
A-S2000




14
A-S2000




When checking the P.C.B.:
· Remove frame panels L/R.
· Put the rubber sheet and cloth over this unit. Then
place the P.C.B. slantingly on the cloth and check it.
(Fig. 7)
· Reconnect all cables (connectors) that have been
disconnected.
· In this unit, the ground of the amplifier unit L/R is
connected to the chassis. When the amplifier unit L/R
is removed from the chassis, connect the ground
point to the chassis, using a ground lead wire or the
like. (Fig. 7)
· It is also possible to check the amplifier unit L/R from
the bottom. (Fig. 7)



AMP unit L
Rubber sheet and cloth




Ground lead
AMP unit R




Ground lead




A-S2000
AMP unit L
AMP unit R




Cloth




Fig. 7
15
A-S2000




7. Removal of FUNCITON (2) P.C.B.
a. Remove 4 screws (F) and a screw (G). (Fig. 8) F G
b. Remove CB401-404. (Fig. 8)
c. Remove the connector TR. (Fig. 8)
d. Disconnect the cable (W4004) from the bottom. (Fig. 9)
e. Remove FUNCTION (2) P.C.B.. (Fig. 8)




F CB404
CB403
CB402
Solder
F
Barrier SP L
Speaker terminal L
CB401
L
H FUNCTION (2) P.C.B.
CB202 H

CB79
BALANCE P.C.B.

K CB203

FUNCTION (3) P.C.B. M CB201
FRONT (13) P.C.B. M
CB2 G
J Q
I
R
CB23
Barrier SP R
R

P


Speaker terminal R
CB27
N N
A-S2000




CB59
Connector TR
FRONT (11) P.C.B.


FRONT (12) P.C.B.
Frame side R



Solder
O



Fig. 8




16
A-S2000




Bottom view




W4004


Fig. 9



8. Removal of BALANCE P.C.B.
a. Remove 3 screws (H) and 4 screws (I). (Fig. 8) H I
b. Remove CB59 and CB201-203. (Fig. 8)
c. Remove BALANCE P.C.B.. (Fig. 8)

9. Removal of Speaker Terminal L/R
a. Remove 2 screws (J) and 2 screws (K). (Fig. 8) J K
b. Remove CB2, CB23 and CB79. (Fig. 8)
c. Remove FUNCTION (3) P.C.B.. (Fig. 8)




A-S2000
d. Remove 2 push rivets (L) and then remove the barrier L
SP L. (Fig. 8)
e. Remove 5 screws (M). (Fig. 8) M
f. Remove the speaker terminal L together with the
P.C.B.. (Fig. 8)
g. Unsolder the P.C.B. to separate the speaker terminal
L. (Fig. 8)
h. Remove 2 screws (N). (Fig. 8) N
i. Remove CB27. (Fig. 8)
j. Remove FUNCTION (11) P.C.B.. (Fig. 8)
k. Remove 4 screws (O) and 3 screws (P). (Fig. 8) O P
l. Remove frame side R. (Fig. 8)
m. Remove 2 push rivets (Q) and then remove the barrier Q
SP R. (Fig. 8)
n. Remove 5 screws (R). (Fig. 8) R
o. Remove the speaker terminal R together with the
P.C.B.. (Fig. 8)
p. Unsolder the P.C.B. to separate the speaker terminal
R. (Fig. 8)




17
A-S2000




10. Removal of FUNCTION (1) P.C.B. and FRONT
(10) P.C.B.
a. Remove 9 screws (S), a screw (T), and 2 screws (U). S T U
(Fig. 10)
b. Remove CB305. (Fig. 10)
c. Remove the cable (W3004) from the bottom. (Fig. 11)
d. Remove FUNCTION (1) P.C.B and FRONT (10) P.C.B.
together with the support PRE L/R. (Fig. 10)

U
CB305 FUNCTION (1) P.C.B.
Support PRE L




FRONT (10) P.C.B.
Support PRE R
S
T
S
S
S




Bottom view
Fig. 10
A-S2000




W3004

Fig. 11
18
A-S2000



I AMP ADJUSTMENT /
G Idling Adjustment

Precaution for handling measuring instrument
The ground side of the measuring instrument to be con-
nected to the speaker terminal of this unit must be kept in
DC +4.0 to +8.0 mV
floating condition because this unit is equipped with the
MAIN (2) P.C.B. L ch
floating balanced power amplifier.
CB75
Condition
· Start adjustment 20 minutes or more after the VR201
power is turned on.
· Non loaded condition

Idling Adjustment
Adjust VR201 (Lch)/VR101 (Rch) so that the DC volt-
age of CB75 (Lch)/CB55 (Rch) becomes +4.0 to
+8.0mV. (Fig. 1)



DC voltage /
mV 10

+4.0 to +8.0 mV

0 1 10 20 minute



MAIN (2) P.C.B. (Side A) MAIN (1) P.C.B. (Side A)
L ch R ch


VR201 VR101



DC +4.0 to +8.0 mV
MAIN (1) P.C.B. R ch

CB55
VR101
DC +4.0 to +8.0 mV




CB75 CB55




Front side



Fig. 1
19
A-S2000




G Headphone DC Offset Adjustment
Condition
· Start adjustment 5 sec or more after the power is MAIN (1) P.C.B. L ch MAIN (2) P.C.B. R ch
turned on.
· No input signal.
· Non loaded condition VR202 VR102

DC offset adjustment
Adjust VR202 (Lch)/VR102 (Rch) so that the DC volt-
age of the CB504 becomes -2.0 to +2.0mV. (Fig. 2)



MAIN (2) P.C.B. (Side A) MAIN (1) P.C.B. (Side A)
L ch R ch




VR202 VR102




Front side




FRONT (2) P.C.B. (Side A) PHONES FRONT (2) P.C.B.




L ch
DC -2.0 to +2.0 mV
R ch
PHONES




R ch L ch
DC -2.0 to +2.0 mV


Fig. 2

20
A-S2000



I UPDATING FIRMWARE /
When replacing the following parts, be sure to write the
latest firmware.
FRONT P.C.B.
Microprocessor (IC502) of FRONT P.C.B.

G Required tools
· Windows 98/2000/Me/XP, PC with a serial port
(RS232C)
· Firmware downloader program
FlashSta.exe (Ver. 2.0)
· Firmware
A-S2000.s2
A-S2000.id
· RS232C cross cable "D-sub 9 pin female"
(Specifications)
Pin No.2 RxD Pin No.2 RxD Pin No.2 RxD Pin No.2 RxD
Pin No.3 TxD Pin No.3 TxD Pin No.3 TxD Pin No.3 TxD
Pin No.5 GND Pin No.5 GND Pin No.5 GND Pin No.5 GND
Pin No.7 RTS Pin No.7 RTS Pin No.7 RTS Pin No.7 RTS
Pin No.8 CTS Pin No.8 CTS Pin No.8 CTS Pin No.8 CTS

· RS232C conversion adapter (Part No. AAX77610)

G Preparation and precautions before starting
the operation
· Download firmware upgrading program and firm-
ware from the specified source to the same folder
of the PC.
· Prepare the above specified RS232C cross
cable.
· While writing, keep the other application software
on the PC closed.
It is also recommended to keep the software on
the task tray closed as well.




A-S2000




21
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G Operation Procedures
1. Turn off the power of this unit and disconnect the
power cable from the AC outlet.
2. Remove the panel side L/R and top cover. (Refer
to [DISASSEMBLY PROCEDURS])
3. Set the switch (SW301) of RS232C conversion
adapter to the "FLASH UCOM" side. (Fig. 1)
4. Connect the writing port of this unit to the serial port
(RS232C) of the PC with RS232C cross cable,
RS232C conversion adapter and flexible flat cable
as shown below. (Fig. 1)



Panel side L Top cover




Writing port /
(FRONT (1) P.C.B.: CB515)
A-S2000




PC
Panel side R



to writing port /

Serial port (RS232C) /

RS232C conversion adapter /




RS232C cross cable / Flexible flat cable (9P) /
SW301
FLASH
UCOM OTHER




Fig. 1



22
A-S2000




5. Reconnect the power cable of this unit to the AC
outlet. At this time, set the "POWER ON/OFF"
switch to the OFF position.
6. Start up "FlashSta.exe".
"Select Program" is displayed. (Fig. 2)
7. Select Program: "Inter flash memory", RS232C Port:
"COMx (serial port of the PC connected to this unit)".
(Fig. 2)
8. After confirming settings, click [OK]. About 5 sec-
onds later, "M16C Flash Start" is displayed.
(Fig. 2)
9. Set the "POWER ON/OFF" switch to the ON posi-
tion.
10. Click [OK]. (Fig. 2)
"Set baudrate" is displayed. (Fig. 3)




Select "Inter flash memory".




After a 5 seconds /




Select the serial port of the PC connected to the main unit.




A-S2000
Fig. 2



11. Select "38400" for Baud rate and "15" for
Program_intervals (ms). (Fig.3)
12. Click [OK]. (Fig.3)




Select 38400bps or below for the baud rate.
* Reduce the baud rate if a transmission error occurs fre-
quently.




Fig. 3




23
A-S2000




13. "ID Check" is displayed. (Fig. 4)
Click [Refer...], and select "A-S2000.s2". (Fig. 4)
* The ID code and MCU type are
loaded when the file is selected.
(Fig. 4)

Click [OK]. (Fig. 4)




When [Refer...] is clicked, the
open file screen is displayed.




Select the firmware "A-S2000.s2".



Fig. 4
A-S2000




24
A-S2000




14. "M16C Flash Start" is displayed. (Fig. 5)
Click [E.P.R...], and "Erase OK?" is displayed.
(Fig. 5)
Click [OK] and start writing. (Fig. 5)
15. When writing is completed, "Program OK." is dis-
played. (Fig. 5)
Click [OK]. (Fig. 5)
16. Set the "POWER ON/OFF" switch to the OFF po-
sition.
17. Disconnect the power cable of this unit from the
AC outlet.
18. End "FlashSta. exe."
19. Disconnect the RS232C cross cable, RS232C
conversion adapter and flexible flat cable.



When click [E.P.R...], "Erase OK?" is displayed.




When click [OK], writing is started.




A-S2000
Writing / Collating /




Click [OK].



Writing completed /

Fig. 5




25
A-S2000




G Confirmation of Firmware Version
Confirm that the firmware is updated successfully by
checking the "Indication of Firmware Version" by the
self-diagnostic function.
For more information, refer to "SELF-DIAGNOSTIC
FUNCTION".

G Indication of Firmware Version



· Operation procedures
Turn the "BALANCE" and "TREBLE" knobs coun-
terclockwise fully and then while pressing down
the "AUDIO MUTE" switch, set the "POWER ON/
OFF" switch to the ON position. (Fig. 6)

· Indication of Firmware Version
The INPUT selector LED indicates the firmware
version in the binary system (BCD).



Example) when the firmware version is [V0035]




"TREBLE" knob "BALANCE" knob
A-S2000




"AUDIO MUTE" switch



"POWER ON/OFF" switch "TREBLE" knob "BALANCE" knob


Fig. 6




26
A-S2000




G Factory Reset
Set back to the factory setting (INPUT: CD BAL).
1. Turn the "BALANCE" knob clockwise fully and
then while pressing down the "AUDIO MUTE"
switch, set the "POWER ON/OFF" switch to the
ON position. (Fig. 7)
2. The INPUT selector LED "CD BAL" will light up
and the normal operation will be restored. (Fig. 7)
3. Set the POWER ON/OFF switch to the OFF posi-
tion to end.




"BALANCE" knob




"AUDIO MUTE" switch



"POWER ON/OFF" switch "BALANCE" knob


Fig. 7




A-S2000




27
A-S2000



I SELF-DIAGNOSTIC FUNCTION /
G Protection Information Display
When the power to this unit is turned on and the power