• cpuintelg620 > dr-620 service manual
  • dr-620 service manual

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    文档作者:Michael Hasinoff
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    DR-620
    Service Manual
    CONTENTS
    SPECIFICATIONS
    1) GENERAL ................................................................ 2 2) TRANSMITTER ........................................................ 2 3) RECEIVER ............................................................... 3 15) BR24C64F-E2 (XA0669) ........................................ 15 16) LC75884W (XA0899) ............................................. 16 17) M51132FP (XA0900) .............................................. 17 18) M30620FCAGP (XA0913/XA0949) ................... 17~19 19) M38503M2H667FP (XA0914) ........................... 20~21 20) M64076AGP (XA0915) ........................................... 22 21) S-816A50AMC (XA0925) ........................................ 23 22) NJM78M05DL1A (XA0947) .................................... 23 23) Transistor, Diode, and LED Outline Drawings .... 24~25 24) LCD Connection ............................................... 26~27
    CIRCUIT DESCRIPTION
    1) VHF Reception ......................................................... 4 2) UHF Reception ......................................................... 5 3) FM Reception ........................................................... 5 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) V/V (VHF-VHF) Dual Reception ................................ 6 U/U (UHF-UHF) Dual Reception ............................... 6 VHF Squelch Control ................................................ 6 UHF Squelch Control ................................................ 6 Transmit Signal Path ................................................. 7 VHF Transmit Signal Path ......................................... 7 UHF Transmit Signal Path ......................................... 7 VHF Tx APC Circuit .................................................. 7 UHF Tx APC Circuit .................................................. 8 VHF PTT Circuit ........................................................ 8 UHF PTT Circuit ....................................................... 8 VHF PLL ................................................................... 8

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