Yamaha A-s300 Service Manual
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Page 21
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
Page 22
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
Page 23
23 A-S500/A-S300 A-S500/A-S300 MAIN ZONE indicator flashing pattern / .*/;0/&
Page 24
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...
Page 25
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 «™‚ ~
Page 26
26 A-S500/A-S300 A-S500/A-S300 «™‚ ~
Page 27
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...
Page 28
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 æ Ð T Ô ž Åæï¬ ?vw¬ Ý ?o d
Page 29
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
Page 30
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...