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INTEGRATED AMPLIFIER

A-S700 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-S700
CONTENTS
TO SERVICE PERSONNEL ............................................2 SELF-DIAGNOSTIC FUNCTION /
IMPEDANCE SELECTOR ...............................................3 ....................................... 19­25
FRONT PANEL ...............................................................3 IC DATA ...................................................................26­28
REAR PANELS ...........................................................4­6 BLOCK DIAGRAM ........................................................29
REMOTE CONTROL PANEL ..........................................7 PRINTED CIRCUIT BOARDS .................................30­43
SPECIFICATIONS / .....................................7­8 PIN CONNECTION DIAGRAMS ...................................44
INTERNAL VIEW ............................................................9 SCHEMATIC DIAGRAMS .......................................45­47
SERVICE PRECAUTIONS / ..... 10 REPLACEMENT PARTS LIST ................................49­59
DISASSEMBLY PROCEDURES / ........... 10­16 REMOTE CONTROL .....................................................60
AMP ADJUSTMENT / ....................... 17­18




Copyright © 2008 All rights reserved.
10111 7 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
animate '08.10
A-S700


TO SERVICE PERSONNEL AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT TESTER OR
Components having special characteristics are marked and OUTLET UNDER TEST EQUIVALENT
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.
· Meter impedance should be equivalent to 1500 ohms shunted · Leakage current must not exceed 0.5mA.
by 0.15 F. · Be sure to test for leakage with the AC plug in both polari-
ties.


"CAUTION"
"F251, F252: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A,
125V FUSE."
CAUTION
F251, F252: REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION
F251, F252: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 8A, 125V.



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
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.




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.
A-S700




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.




2
A-S700


IMPEDANCE SELECTOR
WARNING:
Do not change the setting of the IMPEDANCE SELECTOR switch
when the unit power is switched on, as doing so may damage
the unit.




IMPEDANCE SELECTOR




FRONT PANEL
A-S700 (U, R, T, K, A, B, G, L, J models)




A-S700




3
A-S700


REAR PANELS
A-S700 (U model)




A-S700 (R model)
A-S700




A-S700 (T model)




4
A-S700




A-S700 (K model)




A-S700 (A model)




A-S700
A-S700 (B model)




5
A-S700




A-S700 (G model)




A-S700 (L model)
A-S700




A-S700 (J model)




6
A-S700


REMOTE CONTROL PANEL SPECIFICATIONS /
Audio Section /
RAS7 Minimum RMS Output Power (Power Amp. Section) /
(20 Hz to 20 kHz)
8 ohms, 0.019 % THD ................................... 90 W + 90 W
6 ohms, 0.03 % THD ................................. 105 W + 105 W
Dynamic Power / (IHF)
8/6/4/2 ohms ...........................................135/160/200/240 W
Maximum Output Power / (1 kHz)
R, L, J models (10 % THD, 8/6 ohms, JEITA) ... 140/160 W
B, G models (0.7 % THD, 4 ohms) ........................... 160 W
IEC Output Power [B, G models]
(1 kHz, 0.019 % THD, 8 ohms) ................................. 105 W
Power Band Width /
(0.03 % THD, 50 W, 8 ohms) ....................10 Hz to 50 kHz
Damping Factor /
1 kHz, 8 ohms ...................................................240 or more
Maximum Input Signal /
(1 kHz, 0.019 % THD)
PHONO ....................................................................... 70 mV
CD, etc. ........................................................................ 2.2 V
Frequency Response /
CD, etc. (20 Hz to 20 kHz) ................................. 0 ±0.5 dB
CD DIRECT AMP ON (10 Hz to 100 kHz) .......... 0 ±1.0 dB
RIAA Equalization Deviation /
PHONO ................................................................. 0 ±0.5 dB
Total Harmonic Distortion / (20 Hz to 20 kHz)
PHONO to OUT (REC) (3 V) .......................0.008 % or less
CD, etc. to SP OUT (50 W, 8 ohms) ..........0.012 % or less
Signal to Noise Ratio / (IHF-A Network)
PHONO (5 mV input shorted) .......................87 dB or more
CD DIRECT AMP (200 mV input shorted) .......110 dB or more
Residual Noise / (IHF-A Network)
CD DIRECT AMP ON .................................................. 30 V
PURE DIRECT ON ..................................................... 110 V
Gain Tracking Error /
(0 to -60 dB) .................................................... 2 dB or less

Control Section /
Input Sensitivity/Input Impedance /




A-S700
PHONO .................................................... 3.0 mV/47 k-ohms
CD, etc. .................................................. 200 mV/47 k-ohms
Output Level/Output Impedance /

REC level ............................................... 200 mV/1.2 k-ohms
Headphone Output/Impedance /
RAS7
WQ06690 (Input 1 kHz, 200 mV, 8 ohms, 0.015 % THD)
CD, etc. ..................................................... 0.47 V/470 ohms
Channel Separation /
(5.1 k-ohms input shorted)
CD, etc. ....................................................65/50 dB or more
Tone Control Characteristics /
BASS
Boost/Cut (50 Hz) .................................................. ±10 dB
Turnover frequency ................................................. 350 Hz
TREBLE
Boost/Cut (20 kHz) ................................................ ±10 dB
Turnover frequency ................................................ 3.5 kHz
Continuous Loudness Control /

Attenuation / (1 kHz) .............................. -30 dB

7
A-S700




General /
Power Supply / Dimensions (W x H x D) /
U model ........................................................... AC 120 V, 60 Hz ........... 435 x 151 x 382 mm (17-1/8" x 5-15/16" x 15-1/16")
R model ........................... AC 110/120/220/230-240 V, 50/60 Hz Weight /
T model ............................................................ AC 220 V, 50 Hz .................................................................... 10.9 kg (24 lbs.)
K model ............................................................ AC 220 V, 60 Hz
Finish /
A model ............................................................ AC 240 V, 50 Hz
Black color ........................ U, R, T, K, A, B, G, L, J models
B, G models ..................................................... AC 230 V, 50 Hz
Silver color ........................ U, R, T, K, A, B, G, L, J models
L models ....................................... AC 220/230-240 V, 50/60 Hz
J model ....................................................... AC 100 V, 50/60 Hz Accessories /
Remote control ................................................................ x 1
Power Consumption /
Battery (R6, AA, UM-3) ................................................... x 2
U model ........................................................ 260 W, 360 VA
Power cable (2 m) .......................................................... x 1
R, T, K, A, B, G, L models ........................................ 260 W
J model ........................................................................ 205 W * Specifications are subject to change without notice due to product
Standby Power Consumption / improvements.
...................................................................................... 0.1 W
Maximum Power Consumption [R model]
6 ohms, 1 kHz, 10 % THD ........................................ 650 W U ... U.S.A. and Canadian models B .......................British model
AC Outlets / R .....................General model G ..................European model
2 switched outlets T..................... Chinese model L..................Singapore model
K ...................... Korean model J ................... Japanese model
U model .............................100 W max. total / 0.8 A max. total
A .................Australian model
R model ...............................50 W max. total / 0.2 A max. total
T, G models .......................100 W max. total / 0.4 A max. total
L, J models ....................................................100 W max. total
1 switched outlet
A, B models ...................................... 100 W max. / 0.4 A max.




· DIMENSIONS /
(7/8")
22
339.5 (13-3/8")
290 (11-7/16")



382 (15-1/16")
A-S700




20.5
(13/16")
151 (5-15/16")
130 (5-1/8")
(15/16")
21




395 (15-9/16")
Unit: mm (inch)
435 (17-1/8")




8
A-S700


INTERNAL VIEW
Top view

1 2 3 4 5 6 7 8 9 10 11 1 Power Transformer
2 MAIN (2) P.C.B.
3 MAIN (3) P.C.B.
4 MAIN (8) P.C.B.
5 MAIN (5) P.C.B. (R, L models)
6 MAIN (4) P.C.B.
7 MAIN (7) P.C.B.
8 MAIN (1) P.C.B.
9 MAIN (6) P.C.B.
10 FUNCTION (1) P.C.B.
12
11 OPERATION (10) P.C.B.
12 FUNCTION (2) P.C.B.
13 OPERATION (3) P.C.B.
14 OPERATION (4) P.C.B.
15 OPERATION (2) P.C.B.
16 OPERATION (11) P.C.B.
17 OPERATION (5) P.C.B.
18 OPERATION (6) P.C.B.
Front view 19 OPERATION (7) P.C.B.
20 OPERATION (8) P.C.B.
18 17 16 15 14 13
21 OPERATION (1) P.C.B.
22 OPERATION (9) P.C.B.




19 20 21 22




A-S700




9
A-S700


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 positions 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, perform discharge
by connecting a discharge resistor (5k-ohms/10W)
between terminals at following positions. The time re-
quired for discharging is about 30 seconds.
1. C141 on MAIN (1) P.C.B..
2. C142 on MAIN (1) P.C.B..
Refer to "PRINTED CIRCUIT BOARDS: MAIN (1) P.C.B.".




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


1. Removal of Top Cover
a. Remove 4 screws ( ), 4 screws ( ) and screw ( ).
(Fig. 1)
b. Remove the top cover. (Fig. 1)


2. Removal of Front Panel
* Prepare an Allen hex socket screwdriver (2 mm)
for removal of knob unit.
a. Remove screw ( ), screw ( ) and then remove the
frame top. (Fig. 1)
b. Loosen lock set screw to remove the knob VOL unit.
A-S700




(Fig. 1)
c. Loosen lock set screw to remove the knob SEL unit.
(Fig. 1)
d. Remove 4 knob TCs. (Fig. 1)
e. Remove 2 knob SP13s. (Fig. 1)
f. Remove 7 screws ( ). (Fig. 1)
g. Remove the front panel forward gradually using care
not to cause damage the keys. (Fig. 1)
* When installing the knob VOL/SEL unit, it is necessary
to position them as specified. (Refer to "When install-
ing the knob VOL/SEL unit".)




10
A-S700




Top cover




Frame top




Knob SP13




A-S700
Front panel
Knob TC

Knob SEL unit Lock set screw 2mm




Knob VOL unit



An Allen hex socket screwdriver




Fig. 1




11
A-S700




· When installing the knob VOL unit:
a. Turn the VOLUME (VR805) counterclockwise fully. (Fig. 2)
b. Match the slit in the knob VOL unit with the "VOLUME
MIN" position and install it in that state. (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 VOL unit. (Fig. 2)
d. Tighten the lock set screw. (Fig. 2)
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 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 the VOLUME
MIN position.

· When installing the knob SEL unit:
a. Turn the INPUT (SW803) so that the cut in it comes at
the top. (Fig. 2)
b. Install the knob SEL unit with its lock set screw posi-
tioned at the top. (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 SEL unit. (Fig. 2)
d. Match the lock set screw position with the cut in IN-
PUT (SW803) and tighten the lock set screw.
e. After installation, perform following checks.
· Turn the knob SEL unit in both directions to check
that it does not rub against the front panel.
A-S700




12
A-S700




0.5­0.75mm




Front panel

Lock set screw


Cut
SW803




VR805




Lock set screw




VOLUME MAX.
VOLUME MIN.




A-S700
Slit Knob VOL unit
Knob SEL unit




Fig. 2




13
A-S700




3. Removal of Sub-chassis Unit
a. Remove 2 screws ( ). (Fig. 3)
b. Remove CB283,CB606,CB609,CB611and CB802.
(Fig. 3)
c. Remove the sub-chassis unit. (Fig. 3)




CB283

MAIN (4) P.C.B.




CB609


CB606
CB611
A-S700




Sub-chassis unit
CB802 FUNCTION (2) P.C.B.


OPERATION (1) P.C.B.



Fig. 3




14
A-S700




When checking the P.C.B.s:
· 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 discon-
nected.
· Connect the ground point of the sub­chassis unit to the
chassis with a ground lead or the like. (Fig. 4)




A-S700
Ground lead



Chassis


Sub-chassis unit



Rubber sheet and cloth




Fig. 4




15
A-S700




When checking the P.C.B.s:
· Spread the rubber sheet and the cloth. Then place
this unit on the cloth upside down. (Fig. 5)
· Remove 6 screws ( ) and then remove the chassis
cover. (Fig. 5)




Chassis cover

MAIN (1) P.C.B.
A-S700




Rubber sheet and cloth




Fig. 5




16
A-S700


AMP ADJUSTMENT /
CONFIRMATION OF IDLING CURRENT
1. Right after power is turned on, confirm that the volt-
age across the terminals of R111­R135 (L ch) and
R112­R136 (R ch) are between 0.1 mV to 10.0 mV.
2. If measured voltage exceeds 10.0 mV, open (cut off)
R175 (L ch), R176 (R ch) and reconfirm the voltage.
Attention
If the measured voltage exceeds 10.0 mV after
repairing the power amplifier, check other parts
again for any possible defect before cutting the
resistor.
3. Confirm that the voltage is between 0.20 mV and
15.0 mV after 60 minutes.




0.1mV­10mV
(L ch)

0.1mV­10mV
(R ch)
R135 Cut off




R136
R111 R175 (L ch)
R176 (R ch)




R112




A-S700


R135 R136



R175 R176



R111 R112




17
A-S700




SCHEMATIC DIAGRAM


MAIN (1)




R135




L ch
R175




Cut off
0.1 mV ­ 10 mV




R111
A-S700




R112
R176




R ch
Cut off




R136
0.1 mV ­ 10 mV




18
A-S700


SELF-DIAGNOSTIC FUNCTION /
Indication of Protection Information
When the power to this unit is turned on and the pow-
er indicator is flashing, the normal operation is not
available because the protection function is at work.
In that case, the protection information can be indi-
cated by following procedures.
However, the power supply relay (RY251 of MAIN
P.C.B.) does not turn on.

· Operation procedures
* Perform this operation procedure within 30
seconds after turning off the power.
1. Press "POWER", "CD DIRECT AMP", and "PURE
DIRECT" switches to turn them off respectively.
(Fig. 1)
2. Repeat pressing "CD DIRECT AMP" switch to
turn it ON/OFF twice. (Fig. 1)
3. Repeat pressing "PURE DIRECT" switch to
turn it ON/OFF once. (Fig. 1)
4. Press "POWER" switch inward to the ON/
STANDBY position. (Fig. 1)
The POWER indicator flashes. (Fig. 2)



2. "CD DIRECT AMP" switch 3. "PURE DIRECT" switch
1 2 1




OFF ON OFF ON OFF OFF ON OFF




A-S700
POWER indicator

4. "POWER" switch




OFF ON/
STANDBY

Fig. 1




19
A-S700




· List of protection information
The protection information is indicated by the
flashing pattern of the POWER indicator. (Fig. 2)

Types of protection function / POWER indicator flashing pattern / : Lit /
: Off /

PS protection / Flashing 2 /
500mS 500mS 500mS 1000mS 500mS 500mS 500mS 1000mS 500mS 500mS 500mS

AMP DC protection L/R ch /
Flashing 4 /
500mS 500mS 500mS 500mS 500mS 500mS 500mS 1000mS 500mS 500mS 500mS 500mS


I protection L/R ch / Flashing 6 /
500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 1000mS


TMP protection L/R ch / Flashing 7 /
500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 500mS 1000mS

Normal
(no protection function) / Lit /
Continuous


Fig. 2



· Details of Protection Information
a. PS (Power Supply) protection
Cause: The voltage in the power sup-
ply section is abnormal.
Normal value: 1.12 to 3.04V
Detection port: PRV (90 pin of microprocessor
IC602 of FUNCTION P.C.B.)
Detected at: ACL, ACL2, +15, -15, +5S
b. Amplifier DC voltage protection L/Rch
A-S700




Cause: Abnormal DC voltage of ampli-
fier output L/R
Normal value: 0.96 to 2.57V
Detection port: PRD (91 pin of microprocessor
IC602 of FUNCTION P.C.B.)
Detected at: PRDC (Amplifier output L/Rch
of MAIN P.C.B.)




20
A-S700




c. I protection L/Rch
Cause: Excess current flow into ampli-
fier.
Speaker terminal shorted. (*)
Normal value: LOW (0V)
Detection port: PRI (80 pin of microprocessor
IC602 of FUNCTION P.C.B.)
Detected at: PRI (Amplifier output L/Rch of
MAIN P.C.B.)
* If the protection function works due to
shortage at the speaker terminal, the pow-
er turns off at the excess current protection
L/Rch. However, pressing the "POWER"
switch for OFF/ON causes following opera-
tion to take place and the power to turn on.
1. All INPUT indicators flash until the power
is turned on.
2. The VOLUME knob rotates counterclock-
wise automatically and stops at the 0
(MIN.) position.
3. The power turns on after some seconds.
d. TMP protection L/Rch
Cause: Abnormal temperature of heat
sink.
Normal value: 0 to 1.74V
Detection port: THML (92 pin of microproces-
sor IC602 of FUNCTION P.C.B.)
THMR (93 pin of microproces-
sor IC602 of FUNCTION P.C.B.)
Detected at: PRDL (Heat sink Lch tempera-
ture detection IC101 of MAIN
P.C.B.)




A-S700
PRDR (Heat sink Rch tempera-
ture detection IC202 of MAIN
P.C.B.)




21
A-S700




Starting in the Protection Cancel mode
If the protection function works and causes hindrance to
trouble shoot, cancel the protection function as described
below, and it will be possible to turn on the power.

· Operation procedures
* Perform this operation procedure within 30
seconds after turning off the power.
1. Press "POWER", "CD DIRECT AMP", and "PURE
DIRECT" switches to turn them off respectively.
(Fig. 3)
2. Repeat pressing "CD DIRECT AMP" switch to
turn it ON/OFF twice. (Fig. 3)
3. Repeat pressing "PURE DIRECT" switch to
turn it ON/OFF once. (Fig. 3)
4. Press "POWER" switch inward to the ON/
STANDBY position. (Fig. 3)
"POWER" indicator flashes. (Fig. 3)
5. Press "PURE DIRECT" switch to turn it on. (Fig. 3)
After about 3 seconds, the power relay (RY251
of MAIN P.C.B.) turns on. (Fig. 3)



2. "CD DIRECT AMP" switch 3. "PURE DIRECT" switch
1 2 1




OFF ON OFF ON OFF OFF ON OFF
A-S700




POWER indicator

4. "POWER" switch
5. "PURE DIRECT" switch




OFF ON/
STANDBY OFF ON

Fig. 3


CAUTION!
· Using this product with the protection function
disabled may cause damage to itself. Use special
care when using this mode.


22
A-S700




Note)
· Applying the power to this unit without correcting the
abnormality can be dangerous and cause additional
circuit damage.
To avoid this, if protection function has been activat-
ed the number of times which is set beforehand, the
power will not turn on even when the "POWER" key
is pressed.


a. PS (Power Supply) protection:
If protection function has been activated 3 times
continuously, the power will not turn on.
b. Amplifier DC voltage protection L/Rch:
If protection function has been activated 3 times
continuously, the power will not turn on.
c. I protection L/Rch:
If protection function has been activated 1 time,
the power will not turn on.
However, the power turns on when the protection
function worked due to short at the speaker termi-
nal.
d. TMP protection L/Rch:
The power turns on no matter how many times the
protection function has worked.



Note)
· The output transistors in each amplifier channel
should be checked for damage before applying
power of this unit.
· Amplifier current should be monitored by measuring




A-S700
DC voltage across the emitter resistors for each
channel.
· Set this unit once to the "factory reset" state before
turning on the power again.
(For more information, refer to "Factory Reset"of
SELF-DIAGNOSTIC FUNCTION.)




23
A-S700




Indication of Firmware Version
The firmware version of the microprocessor is indicat-
ed in the binary code (BCD) using INPUT indicates.

· Operation procedures
* Perform this operation procedure within 30
seconds after turning off the power.
1. Press "POWER", "CD DIRECT AMP", and "PURE
DIRECT" switches to turn them off respectively.
(Fig. 4)
2. Repeat pressing "CD DIRECT AMP" switch to
turn it ON/OFF 3 times. (Fig. 4)
3. Repeat pressing "PURE DIRECT" switch to
turn it ON/OFF once. (Fig. 4)
4. Press "POWER" switch inward to the ON/
STANDBY position. (Fig. 4)
INPUT indicators lights up. (Fig. 4)


2. "CD DIRECT AMP" switch 3. "PURE DIRECT" switch
1 2 3 1




OFF ON OFF ON OFF ON OFF OFF ON OFF
A-S700




INPUT indicators
4. "POWER" switch




OFF ON/
STANDBY


Example) When the firmware version is [V0007]
V0007

Firmware version /
INPUT indicators /
Binary number (BCD) [Lit: 1, Off: 0] /
LINE 3 LINE 2 LINE 1 CD TUNER PHONO Decimal number /
(25 = 32) (24 = 16) (23 = 8) (22 = 4) (21 = 2) (20 = 1)
0 0 0 1 1 0 V0006 (4 + 2 = 6)
0 0 0 1 1 1 V0007 (4 + 2 + 1 = 7)
0 0 1 0 0 0 V0008 (8)
· ·
· ·
· ·
Fig. 4
24
A-S700




Factory Reset
Return below settings to those when shipped from
the factory.
In the parentheses ( ) are settings when shipped
from the factory.
a. Power (OFF)
b. INPUT (CD)
c. Protection history (None)
d. Number of times when protection is detected (0)
e. Indication of speaker short detected (None)

· Operation procedures
* Perform this operation procedure within 30
seconds after turning off the power.

1. Press "POWER", "CD DIRECT AMP", and "PURE
DIRECT" switches to turn them off respectively.
(Fig. 5)
2. Repeat pressing "CD DIRECT AMP" switch to
turn it ON/OFF 4 times. (Fig. 5)
3. Repeat pressing "PURE DIRECT" switch to
turn it ON/OFF once. (Fig. 5)
4. Press "POWER" switch inward to the ON/
STANDBY position. (Fig. 5)
When settings return to those when shipped
from the factory, "CD" of the INPUT indicators
lights up. (Fig. 5)
After some seconds, the power relay of this
unit turns on and the normal operation is re-
stored.

2. "CD DIRECT AMP" switch 3. "PURE DIRECT" switch
1 2 3 4 1




A-S700
OFF ON OFF ON OFF ON OFF ON OFF OFF ON OFF




INPUT indicators
4. "POWER" switch




OFF ON/
STANDBY


Fig. 5
25
A-S700


IC DATA
IC602: M30302MAP-A95FP (FUNCTION P.C.B.)
Single-chip 16-bit CMOS microprocessor


8 8 8 8 8 8 8



Port P0 Port P1 Port P2 Port P3 Port P4 Port P5 Port P6

Internal peripheral function




Port P7
System clock
A/D converter generation circuit




8
Timer (16-bit)
(10-bits X 18-channels)
X IN-XOUT
Output (timer A): 3 XCIN-XCOUT
UART or clock synchronous




Port P8
Input (timer B): 3 serial I/O




7
(3-channels)


CRC arithmetic circuit (CCITT)




Port P8_5
(Polynomial : X 16+X12+X5+1)


M16C/60 series 16-bit Memory
Microprocessor core
Watchdog timer ROM




Port P9
(15-bits) SB
R0H R0L
USP RAM




8
R1H R1L
DMAC R2 ISP
(2-channels) R3
INTB




Port P10
A0 PC
A1
A1
FB FLG Multiplier
FB




8
62 Vcc2
80 P10
79 P11
78 P12
77 P13
76 P14
75 P15
74 P16
73 P17
72 P20
71 P21
70 P22
69 P23
68 P24
67 P25
66 P26
65 P27


63 P30


61 P31
60 P32
59 P33
58 P34
57 P35
56 P36
55 P37
54 P40
53 P41
52 P42