Service Manuals, User Guides, Schematic Diagrams or docs for : LG Car Audio tcc-670 TCC-67~2

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                 ADJUSTMENTS

1. TEST & ADJUSTMENT POINT




                                    C




                                    G



                                    A

                                    B


                        Figure 1.




                                        1
2. FM ADJUSTMENT
                                        Power Supply                             PRE OUT



                                              GND

                                              (GND)
                  STEREO SG                   (BACK UP)
                                              (ACC)                                                                    VTVM                     SCOPE


                                       FM SSG                 UNIT

                                          EXIT                             ANT Jack.
                                          MODE                                                                        IN OUT
                                              OUT
                  AUDIO OSC




                                                                        Figure 2.

(1) The impedance of FM antenna terminal is 75.
    Therefore, connect coaxial cable (3C-2V etc.) between FM SG and antenna terminal when wiring.
                       Item         FM SSG                Available              Antenna
                                   Attenuator               Power               Terminal
        Type                       Indication                Rato                 Voltage
        Open indication                 0dB                 5.2dBf                6dB/uV
        type                           60dB                65.2dBf               66dB/uV
        Load or close                   0dB                11.2dBf               12dB/uV
        indication type                54dB                65.2dBf               66dB/uV

(2) There are two kind in indication of FM SG output attenuator
   1) Attenuator with marking of 75 open ... open indication type.
   2) Attenuator with marking of 75 load or close ... load or close indication type.

(3) FM SG output level in this FM adjustment are described as open indication type. The left table shows
    relations among FM SG attenuator indication (dB), available power ratio (dBf) and antenna terminal voltage
   (dB/uV) in each indication type.

NOTE: 1. BAND Switch .................................................................................................................................. FM
      2. BALANCE .................................................................................................................................... Center
      3. TREB/BASS .................................................................................................................................. Center
      4. Connect as shown in figure 2.
      5. Refer to figure 1 for Adjustmenu Points.

                                     FEED SIGNAL
 STEP          SUBJECT                                            MEASURE OUTPUT                  ADJUSTMENT              ADJUST FOR         REMARK
                                   FROM              TO
                               98MHz 60dB ANT Jack
                                                               Between Point A & Point
    1       Discriminator      No Dev.          or                                                       T101            DC 0V 

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