Alinco Dj-190 Service Manual

DJ-190Service ManualCONTENTS      +SPECIFICATIONS2      +CIRCUIT DESCRIPTION3      +SEMICONDUCTOR DATA9      +EXPLODED VIEW15      +PARTS LIST18      +ADJUSTMENT21      +PCBOARD VIEW26      +CIRCUIT DIAGRAM36     +BLOCK DIAGRAM43ALINCO INCORPORATEDTWIN 21 M.I.D. TOWER  BUILDING 23F, 1-61, 2-CHOME,
SHIROMI CHUO-KU , OSAKA, 540-8580 JAPAN
Tel (81)6-6946-8150 fax (81)6-6946-8175e-mail: [email protected] 

SPECIFICATIONSFrequency Coverage     TX            RX DJ-190T (u.s. Amateur version)144.000 ~ 147.995MHz 135.000 ~ 173.995MHz DJ-190E (European Amateur version)144.000 ~ 145.995MHz 144.000 ~ 145.995MHz DJ-190TA1 (commercial version VHFL)135.000 ~ 155.000MHz 135.000 ~ 173.995MHz DJ-190TA2 (commercial version VHFH)150.000 ~ 173.995MHz 135.000 ~ 173.995MHzChannel Step:5, 10, 12.5, 15, 20, 25, 30kHzstepsMemory Channels:40 ChannelsAntenna Impedance:50ohm unbalancedFrequency Stability:+/-5 ppmMicrophone Input...

CIRCUIT DESCRIPTION1) Receiver SystemThe receiver system is a double superheterodyne system with a 21.7 MHzfirst IF and a450 kHz second IF.1. Front EndThe received signal at any frequency in the 130.00- to 173.995-MHz rangeis passed through the low-pass filter (L102, L103, L104, C113, C107, C116,and C114) and tuning circuit (L112 and D107), and amplified by the RFamplifier (Q107). The signal from Q107 is then passed through the tuningcircuit (L109, L110, L111, and varicapsi D104, D105 and D106)...

2) Transmitter SystemThe audio signal is converted to an electric signal in either the internal or 1. Modulator Circuitexternal microphone, and input to the microphone amplifier (IC6). IC6consists of two operational amplifiers; one amplifier (pins 1, 2, and 3) iscomposed of pre-emphasis and IDC circuits and the other (pins 5, 6, and 7)is composed of a splatter filter. The maximum frequency deviation isdetermined to its optimal value by switch circuits consisting of Q9 and Q10and input to the cathode of...

5. VCO CircuitA Colpitts oscillation circuit driven by Q301 directly oscillates the desiredfrequency. The frequency control voltage determined in the CPU (IC5) andPLL circuit is input to the varicaps (D301 and D304). This changes theoscillation frequency, which is amplified by the VCO buffer (Q302) andoutput from the VCO unit.NoteThe oscillation frequency is determined by turning Q301 0N and OFF.Displayed frequenciesQ301TX: 130.00 - 139.995 MHzOFFRX: 130.00 - 161.695 MHzTX: 140.00 - 173.995 MHzONRX:...

5) CPU Terminal Functions: M38267M8L (XA413)
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No.Pin NameSignalI/0LogicDescriptionNo.Pin NameSigna1I/0LogicDescription1C1C1---51P15/SEG39F/KEYIActive lowFunction key input2VL1VL1IA/DLCDpowersupply52P14/SEG38K10I-3P67/AN7SMTIA/DS-meterinput53P13/SEG37K11I-4P66/AN6SQLIA/DNoise level input for squelch54P12/SEG36K12I-5P65/AN5BATIA/DLow battery detection input55P11/SEG35K13l-6P64/AN4BP5IA/DBand plan556P11/SEG34K14I-Key matrix input7P63/CLK22/AN3BP4IBand plan457P07/SEG33SFTO-VCO frequency range change8P62/CLK21/AN2ULIActivehighPLL unlock signal...