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CD ADJUSTMENT PROCEDURES
CLOCK ADJUSTMENT PROCEDURES
Preparation
Set the trimming resistors R123 to center.
Focus gain adjustment
1. Set the output of the audio oscillator to 1 kHz and 1 1.5 VP-P
2. Connect the oscilloscope and audio oscillator as shown below. (Refer to Fig-1)
3. Load the test disc YEDS-18 on the tray and play the track 2.
4. Adjust the trimming resistor R123 so the signal of channel 2 on the oscilloscope becomes 1.25 times of channel 1.
(Refer to Fig-2)
5. Remove the oscilloscope and audio oscillator.
P105
R123
F-GAIN
TEST POINT
P104
Trimming resistor R123
Audio oscillator
+
GND
Oscilloscope
ch 2 GNDch 1 GND
1
2
RFVC
1
43
2
FE1 FE2 TE1 TE2
Test point
P105
Test point
P104
Fig-1
Fig-2
* The adjustment of focus offset adjustment is unnecessary.
F
reqency counter
1. Connect the frequency counter to the terminal TP01 on main PC board (NAAR-6875)
2. Press and hold down the MEMORY button , then press the DISPLAY button.
(All segments on FL tube light on)
3. Adjust the trimmer capacitor C703 so that the reading of frequency counter becomes 524.288 kHz 1Hz.
C703
TP01
FREQCAL
524,287 524,289 Hz
Trimmer capacitor C703
ST
STEREO
MUTING
MIN
kHz
MHz
MONOAUTOTRACKTIMER
W.DAY
W.END
REC
SLEEP
CD
MEMORY
REPEAT
RANDOM
RDS
PMAM
S.BASS
DIRECT
Display
CR-305X