Kenwood KDC-C469 Service Manual page 9

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● RF MODULATOR UNIT
1. DC balance adjustment (VR301)
While observing the waveform with an oscilloscope at pin
13 of IC301, adjust VR301 to minimize the waveform level.
2. PLL control voltage adjustment (VC301)
First set the transmission frequency to *87.9MHz with the
commander, then adjust VC301 so that the DC Voltage at
the + pole of C317, measured using a multi-meter or digital
tester, is +3V±0.1V).
* NOTE : E type is 87.7MHz.
3. Modulation level adjustment (VR303)
The method uses a standard receiver or tuner.
Adjust VR303 so that the output level from the standard
receiver or tuner is as specified.
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ADJUSTMENT
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● L.P.S. initial position adjustment procedure
1. Connect the changer to the HEAD UNIT (H/U).
2. While holding the magazine eject button of the changer,
press the reset button of the H/U.
3. After about 3 seconds, release the magazine eject button.
4. Press the SRC button of the H/U to enter the CD-CH mode,
and the H/U's display section indicates "E-88".
5. Move the mechanism deck to around the 1st stage by press-
ing the DISC- or DISC+ button.
6. Insert the adjustment tool (W05-0635-00) into the tool hole
on the changer mechanism.
7. Then press the DISC+ button to move the mechanism deck
until the mechanism's slider hits the adjustment tool.
8. When the motor locks (stops), press the REPEAT key of
the H/U.
When the REPEAT key is pressed, the mechanism moves
automatically to the 1st stage and the initial position adjust-
ment completes. (The data is written in the EEPROM at
this time.)
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W05-0635-00
● Caution : Note on IC8 (EEPROM)
Be sure to use the W05-0869-00 when replacing the
EEPROM. IC8 stores the digital servo data of the pickup
servo.
Therefore, if the EEPROM does not store servo data, ER-
ROR76 (E-76) will indicate the H/U's display section at the
moment CD is played.
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KDC-C469/Y/FM/FMA
KDC-C669/Y
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