Sony ICF-CD855V Service Manual page 12

ICF-CD855V
CD-JUMP TEST MODE
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board.
Connecting Location: CD board (See page 15)
2. Connect 22 kΩ and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and further connect 47 kΩ and 47 kΩ resistors
respectively and short them to the GND, and the CD-JUMP TEST MODE will be activated.
3. Insert a CD disc.
4. Turn the power on. Press the
[MODE]
5 . If the button is pressed, you can jump in fast feed or fast reverse direction with the + > or – . button by the jump
amount set in Table 1.
Table 1
LCD
+ >
REP ALL TRACK + 1
SHUFFLE TRACK + 10
SHUFFLE, REP TRACK + 100
Waveform of TP (TE) and TP (VREF) output in each mode is as follows.
REP ALL mode
500 µs/div
SHUFFLE mode
1 ms/div
SHUFFLE REP mode
10 ms/div
6. Turn the power off to release the CD-JUMP TEST MODE.
12
button.
CD u
Button
– .
TRACK - 1
TRACK - 10
TRACK - 100