Read Sony ICF-CD855 / ICF-CD855L Service Manual online
12
ICF-CD855/CD855L
CD-JUMP TEST MODE
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board.
1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board.
Connecting Location: CD board (See page 15)
2. Connect 22 k
Ω 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
4. Turn the power on. Press the
CD
u
button.
5 . If the
[MODE]
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
Button
+
>
–
.
REP ALL
TRACK + 1
TRACK - 1
SHUFFLE
TRACK + 10
TRACK - 10
SHUFFLE, REP
TRACK + 100
TRACK - 100
Waveform of TP (TE) and TP (VREF) output in each mode is as follows.
6. Turn the power off to release the CD-JUMP TEST MODE.
REP ALL mode
500
500
µ
s/div
SHUFFLE mode
1 ms/div
1 ms/div
SHUFFLE REP mode
10 ms/div
10 ms/div
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