Yamaha A-s300 Service Manual

							21
A-S500/A-S300
A-S500/A-S300
OFF ON/
STANDBY
OFFOFF ON1OFF ON2OFF ON3
2. “PURE DIRECT” switch
3. "   "(power) switch
■  SELF-DIAGNOSTIC FUNCTION / 
¼ ž¬¢×~

…;ó£
Š;tx
						

							22
A-S500/A-S300
A-S500/A-S300
3.  Indication of protection information
Ó髳ãï	ØCw
¯Ô2.  Indication of power management switch status
108&3
./(&.&/5 
						

							23
A-S500/A-S300
A-S500/A-S300
MAIN ZONE indicator flashing pattern /
.*/
;0/&
						

							24
A-S500/A-S300
A-S500/A-S300
DC voltage protection
Cause:  Abnormal DC voltage of amplifier 
output.
Normal value:  0.947 to 2.517V
Detection port:  PRD (FUNCTION P.C.B. 89 pin of 
the microprocessor IC502)
Detected at: Amplifier output L/Rch of MAIN 
P.C.B.
THM protection L/Rch
Cause: Abnormal temperature of heat 
sink.
Normal value:  0.20 to 1.66V
Detection port: THML (FUNCTION P.C.B. 84 pin 
of the microprocessor IC502)
THMR (FUNCTION P.C.B. 83 pin 
of the microprocessor IC502)
Detected at: THML (Heat sink temperature 
detection Lch IC101 of the MAIN 
P.C.B.)
THMR (Heat sink temperature 
detection Rch IC102 of the MAIN 
P.C.B.)%$ ?y
						

							25
A-S500/A-S300
A-S500/A-S300
OFFON 4. "PURE DIRECT" switchOFF ON/
STANDBY
OFFOFF ON1OFF ON6
3. "   "(power) switch2. "PURE DIRECT" switch
………
INPUT indicators
«™‚
~
 
						

							26
A-S500/A-S300
A-S500/A-S300
«™‚
~
 
						

							27
A-S500/A-S300
A-S500/A-S300
OFFOFF ON/
STANDBYON/
STANDBY
INPUT indicators 1. SPEAKERS selector
2. "   "(power) switch
3. "   "(power) switch
Fig. 6
● Initialization
This operation initializes the back-up IC to return 
the settings below to those when shipped from the 
factory.
a. INPUT (CD)
b.  Protection history (None)
c.  Number of times when protection is detected (0 
times)
*  In the parentheses ( ) are settings when 
shipped from the factory.
Operation Procedures
With the self-diagnostic function activated, follow 
the steps below.
1.  Set the SPEAKERS selector to the A position. 
(Fig. 6)
2.  Press the “
” (power) switch to turn off the 
power once.
3.  Press the “
” (power) switch inward to turn on 
the power again.
The settings above return to those when 
shipped from the factory and “CD” of the 
INPUT indicators lights up. The power relay 
turns on in a few seconds and the normal 
operation is restored.

						

							28
A-S500/A-S300
A-S500/A-S300
R160
R161
MAIN (1) P.C.B.
Cut off
R139 (L ch)
R142 (R ch)
0.1mV–10mV
(L ch)
0.1mV–10mV
(R ch)
R160
R161
R139
R142
■ AMP ADJUSTMENT / 
žïÓ
æÐ
T
Ô
 ž Åæï¬?vw¬Ý

 ?od
						

							29
A-S500/A-S300
A-S500/A-S300
L ch
R ch
0.1 mV – 10 mV
R139
R142
R160
R161Cut off
Cut off
MAIN (1)
0.1 mV – 10 mV
SCHEMATIC DIAGRAM 
						

							30
A-S500/A-S300
A-S500/A-S300
8182838485868788899091929394959697989910 0
N_SWMT
PWE_MGT
THMR
THML
SPBRY
SPARY
HPRY
NC
PRD
AD_VOL
VRUP
VRDN
PRV
KEY1
KEY0
AVSS
REC
VREF
AVC C
DIG_SW
807978777675747372717069686766656463626160595857565554535251
DLED
PRY
EEP_SCL
EEP_SDA
NC
PW_DET
NC
PRI
MODEL
DEST
+5S_PON
DOCK_TYP
IPD_N_DET
IPD_MISO
N_PREMT
PD_SW
VSS
CD_SW
VC C
VOL_RA
VOL_RB
PHONO_LED
DOCK_LED
TUNER_LED
CD_LED
LINE1_LED
LINE2_LED
LINE3_LED
ISA
ISB NC
TRIG
MPLED
FL_N_RST
FL_MOSI
FL_N_CE
FL_SCK
BYTE
CNVSS
NC
ZPLED
N_RST
XOUT
VSS
XIN
VC C
NMI
KEY1_N_INT
MPSW
REM
NC
SIRI_MISO
IPD_N_APDET
SIRI_MOSI
DOCK_PON
UAW_PON
SIRI_PON
IPD_N_VOL
IPD_MISO
IPD_MOSI
5049484746454443424140393837363534333231
RDS_RDY
RDS_MISO
TU_SCL
TU_SDA
N_CE
RDS_SCK
RDS_N_RST
TU_N_TUNED
TU_N_ST
N_EMP
EVOL_MOSI
EVOL_SCK
N_Z2MT
NC
NC
NC
BSY
CLKF
RXDF
TXDF
123456789101112131415161718192021222324252627282930
Timer (16-bit)
Internal peripheral functions
Inputs (timer B): 6
Three-phase motor control circuit Outputs (timer A): 5
Watchdog timer(15-bit)
Remote control signal
receiver (2 circuits)
PWM function (8-bit x 2)CEC function
Real-time clock
VCC1 ports VCC2 ports
 
A/D converter(10-bit resolution X 26 channels)
System clock generator
PLL frequency synthesizer
On-chip oscillator (125 kHz)XIN-XOUTXCIN-XCOUT
Port P0
8
Port P1
8
Port P1
8
Port P3
8
Port P4
8
Port P5
8
Port P10
8
Port P9
8
Port P8
8
Port P7
8
Port P6
8
ISPUSP
INTB
SB
CRC arithmetic circuit
(CRC-CCITT or CRC-16)DMAC (4 channels)
Voltage detecter
On-chip debugger Power-on reset
Multiplier
MemoryROM 
RAM
FB A1FLGPC
UART or
clock synchronous serial I/O
Clock synchronous serial I/O
Multi-master I
2C-bus interface
(6 channels)
(8 bit x 2 channels)
(1 channel)
D/A converter(8-bit resolution X 2 circuits)
M16C/60 series
Microprocessor core
R0L R0H
R1H R1L
R2
R3
FB A1 A0
IC502:   R5F364A6NFA (FUNCTION P.C.B.)
Single chip 16-bit microprocessor
■ IC DATA