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