Adjustment; Test Mode - Yamaha CDC-775 Service Manual

ADJUSTMENTS
Necessary items
Measuring instruments
Oscilloscope
(Band width of 50MHz or more)
Jitter meter
Test disc
SONY YEDS-18 (P/No. TX911730),
A-BEX TCD-782 (P/No. TX913350)
or Philips 5
OK
(Fig. A)
V : 0.2V/div H : 0.5µsec/div
AC range 1 : 1 probe
NG
(Fig. B)
Jitter Adjustment
q
Connect an oscilloscope and a jitter meter to the test
: x 1
points EFM and GND.
w
Set to the TEST mode.
: x 1
(While pressing both the "PLAY/PAUSE" and "STOP"
keys, turn ON the power switch.) See page 9 for
TEST mode explanation.
e
Set the test disc on the turntable, and press the
: x 1
"TEXT SRCH" key on the remote control. And then
the disc is clamped up.
r
Press the DISC2 key.
(Auto adjustment mode 1)
t
Press the DISC3 key.
(Auto adjustment mode 2)
y
Press the DISC4 key.
(Auto adjustment mode 3)
u
Press the PLAY/PAUSE key.
(Play mode)
i
Press the DISC5 key, and check "EQSW ADJ (DC)"
is displayed.
(EQSW adjustment mode)
o
Press the OUTPUT LEVEL + or – key, and adjust the
needle of jitter meter to minimum.
Specification : ≤ 32 nS (3T)
!0
Press the OUTPUT LEVEL + or – key, and adjust the
bottom of EFM signal (eye pattern) waveform clearly.
(Fig. A)
!1
Bottom
At last press the DISC5 key, and check "00:00"(time)
is displayed.
Bottom
CDC-775
GND(J44)
EFM(J180)
12