Kenwood TK-880 Service Manual

Also see for TK-880 series: Programming instructions Instruction manual Instruction manual Instruction manual Instruction manual

33TK-880Ref. No. Use / Function Operation / ConditionQ27 SB switch Q28 on time onQ28 SB SW control Q30 on and Q31 off time onQ29 H/L switch High power time "H"Q30 SB SW control Power on time onQ31 SB SW control DC 20V and over time onQ32 DET mute TX time onQ201 RF amp Low noise amplifierQ202 RF amp TX drive firstQ203 Pre IF amp 44.85MHzQ204 RF amp TX driveQ205 RF amp TX drive lastQ300 Buffer amp PLLQ301,302 Active filterQ401 Short protectionQ402 W/N switch Wide time offQ403 W/N switch Wide time onD1~6 ProtectionD7 HOR protectionD8,9 ProtectionD11 AF muteD12~14 ProtectionD15 HT switchD16 Reverse protectionD17 ProtectionD20 Reverse protection IGND21 Protection 5V (IGN)D22,23 W/N CF changeD24 Over currentprotectionD26 Reverse protectionD27 Power detectionD28 ProtectionD30 Power detectionD31 Reverse protectionD32 Surge absorption BD34 Protection DC 20V and over time onD35 Charge DEOD37 Reverse protectionD200 Large input protection E versionD203~206 BPF tune E versionD207 Usable temperaturerangeD209 ANT swtich TX time onD210,211 ANT switchD212~215 BPF tune E versionD902,903 BPF tune E3 versionTX-RX Unit (B/2)Ref. No. Use / Function Operation / ConditionIC501 LPF, amplification LSDIC502 Amplification AF, HSDIC503 Reference voltage/ ASQBuffer ampRef. No. Use / Function Operation / ConditionIC504 Audio processor Compander, MIC amplifier, ALC,Modem, AF filter, IDCIC506 Analog switch MO, DEO, EMG, MI switchIC507 DTMF decoder DTMF detectionIC508 Shift register LR, LG, KBLC, MM1, T/R, KEY,BSFT, PA2 outputIC509 Reset Power on time "L" outputIC510 Flash ROMIC511 CPUIC512 EEPROMIC513 5V AVR 5C (Control unit)IC710 Buffer amp HSDIC711 Buffer amp MICQ501 MIC mute MM "H" and MM1 "H" time mute onQ502 AF mute KEY "H" time mute onQ503 Noise ampQ507 Inverter PA2 H/L switchQ508 LED switch LG "H" time on, Busy time green onQ509 LED switch LR "H" time on, TX time red onQ510 Clock switch shift BSFT "H" time clock shift onQ511 FSW swtich FSW "L" time foot switch onQ512 Key backlight switch KBLC "H" time onQ513 Key backlight switch KBLC "H" time key backlight onQ515 Keybacklight switchD501 Surge absorption BLCD502 Over current PSBprotectionD503 Surge absorption CMD504 Surge absorption PTT/TXDD505 Surge absorption HOOK/RXDD507 MIC mute MM/MM1D508 Limiter MICD509 Limiter ASQD510 Reverse current C575 chargeprotectionD511 BUSY/TX LED Busy time green on, TX time red onD512~517 Key backlight KBLC "H" time onD518 Current regulation Key backlightVCO UnitRef. No. Use / Function Operation / ConditionQ101 Oscillator RXQ102 Inverter TX (ST "H") time onQ103 Oscillator TXQ104 TX/RX switch TX (ST "H") time onQ105 TX/RX switch Q102 off time onQ106 Buffer ampD101 RX VCOD102 TX VCOD103 RX VCOD104 TX VCOD105 ModulationDESCRIPTION OF COMPONENTS