Sony STR-K900 Service Manual - Page 17
Block Diagram - Display/power - remote control
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3-2. BLOCK DIAGRAM - DISPLAY/POWER SECTION - STR-K880/K900 • R-CH is omitted due to same as L-CH. L • Signal Path : FM A MAIN SECTION SL (Page 16) C SBL B MAIN SECTION (Page 16) FL101 FLUORESCENT INDICATOR TUBE F1 F2 14 29 42 31 SEG1-16 GRID1-12 IC100 FL DRIVE STB CLK DIN 789 FL_DATA FL_CLK IC101 BUFFER 9 IC701 POWER AMP +V OUT2 12 8 IN2 NF2 9 Q701,702 LIMITER Q703 BOOSTER -V OUT2 11 IC601 POWER AMP +V OUT2 12 8 IN2 NF2 9 Q704 BOOSTER Q651,652 LIMITER Q653 BOOSTER -V OUT2 11 POWER AMP IC501 +V OUT2 12 8 IN2 NF2 9 Q501,502 LIMITER Q654 BOOSTER Q503 BOOSTER -V OUT2 11 +V OUT1 2 6 IN1 NF1 5 Q571,572 LIMITER Q504 BOOSTER Q533 BOOSTER -V OUT1 3 Q534 BOOSTER FL_LAT SYSTEM CONTROL IC1101(2/2) X0 X1 A/D1 A/D2 ADCC STR-K880/K900 J2000 AUTO CAL MIC 82 83 39 40 38 X1101 24MHz FUNCTION KEY S108-111,115 FUNCTION KEY S101-107 IC2000 5 AMP 1 VOL_ENC(B) VOL_ENC(A) ENC_B ENC_A POWER KEY POWER RY PROTECTOR HP DETECT HP RY FRONT RY REAR RY C/SB RY SP_B_RY Q705,706 CURRENT DETECT Q740 AF POWER PROTECT Q655,656 CURRENT DETECT Q640 AF POWER PROTECT Q505,506 CURRENT DETECT Q540 AF POWER PROTECT Q535,536 CURRENT DETECT Q580 AF POWER PROTECT D721 Q722,723,725 PROTECT SWITCH 61 64 65 31 ENCODER RV102 MASTER VOLUME 32 31 31 ENCODER RV101 INPUT SELECTOR R-CH Q790 RELAY DRIVE RY791 Q710 RELAY DRIVE RY701 R-CH TM601 L R J791 PHONES FRONT A R-CH Q610 RELAY DRIVE RY601 Q800 RELAY DRIVE RY600 R-CH Q550 RELAY DRIVE RY501 SR SL TM602 L R TM501 C SURROUND SPEAKERS IMPEDANCE USE 6-16Ω FRONT B CENTER FL101 -20V D1110 D1108 D1107 D1111 55 62 66 69 68 67 56 58 S100 ?/1 SB SURROUND BACK K880 BRIGEABLE RY 72 FUSE DETECT 63 SIRCS 54 AVCC 35 VCC3 84 VCC5 23 RSTX 77 STOP 48 IC102 REMOTE 1 CONTROL RECEIVER IC1111 1 RESET 2 +B -B IC691 2 1 POWER AMP -B IC691 5 7 +3.3V +2.5V +5V TUNER +3.3V AEP, UK TUNER +10V RELAY +B AUDIO +7V AUDIO +5V AUDIO -7V +3.3V (STBY) 17 17 Q801 -20V REG D802 R803 T901 Q691,692 -B SWITCH IC1901 2 +3.3V REG 5 +2.5V REG 4 IC1031 3 +5V REG 1 IC1071 3 +3.3V REG 1 Q809 RELAY DRIVE RY801 RY802 RY803 EXCEPT CND CND D805-808 EXCEPT E51 IC1902 3 +10V REG 1 D920-923 S901 VOLTAGE SELECT IC801 1 +7V REG 3 E51 IC1001 F901 3 +5V REG 1 F1 IC802 3 -7V REG 2 IC1904 F2 D910-913 T902 3 +3.3V REG 1 AC IN Q921 AC DET D914 D915 Q901 RELAY DRIVE RY901
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