Kenwood R-V251 Service Manual

Contents

Pin No. Name I/O Description1~3 T.P O Test monitor. Normally outputs Low.(Unused.)4 VSSO - Digital GND.5~8 T.P O Test monitor. Normally outputs Low.(Unused.)9 TSTO I Digital GND.10 VDDO - Digital power supply.11 VSS1 - Digital GND.12~15 TST1~4 I Digital GND.16 XRST I System reset input. Reset when Low.17 BFOT O Unused.18 CSL1 I Digital power supply.19 CSL2 I Digital GND.20 VSS2 - Digital GND.21 AVS3 - L-ch DA converter GND.22 AVD3 - L-ch DA converter power supply.23 LOUT O L-ch DA converter output.24 AVD1 - L-ch AD converter power supply.25 AVS1 - L-ch AD converter GND.26 L01 O L-ch AD converter LPF operational amplifier inverted output.27 LIN I L-ch AD converter analog input.28 AVD5 - C-ch DA converter power supply.29 AVS5 - C-ch DA converter GND.30 XCOUT O C-ch DA converter output.31 AVDX - Analog power supply for master clock.32 XTLO O Crystal oscillator circuit output.33 XTL1 I Crystal oscillator circuit input.34 AVSX - Analog GND for master clock.35 XSOUT O S-ch DA converter output.36 AVS6 - S-ch DA converter GND.37 AVD6 - S-ch DA converter power supply.38 RIN I R-ch AD converter analog input.39 LO2 O R-ch AD converter LPF operational amplifier inverted output.40 AVS2 - R-ch AD converter GND.R-V2515CIRCUIT DESCRIPTIONActivePin. No. Pin Name I/O Description H L56 POWER RLY O Power relay control. ON57 10dB. ATT O Volume 10dB attenuator control. ON58 ST. LED O STANDBY LED control(RED). ON59 ST. LED O STANDBY LED control(GREEN). ON60~69 - - Unused.70~77 9S~16S O FL segment(9~16) and key scan(1~8) control.78~85 1S~8S O FL segment(1~8) control.86~88 - - Unused.89 VDD - u-COM power supply(+5.0V).90,91 - - Unused.92~100 G11~G03 O FL grid control.2. Key matrix3. Pin description of dolby prologic IC(MAIN PCB IC105)KS1(77pin) KS2(76pin) KS3(75pin) KS4(74pin) KS5(73pin) KS6(72pin) KS7(71pin) KS8(70pin)K1(19pin) MODE TUNING - - - - PTY AUTOTIMER TIMER TIMERK2(18pin) MULTI TUNING CLOCK - MODE SET TA MEMOK3(17pin) MULTI - INPUT ON/STBY INPUT TAPE2 DISP BAND