Sanyo GCD 2700 - EXPLODED VIEWS AND PARTS LIST; Exploded Views

i
.-
8
CD PLAYER ADJUSTMENTS
(a)
(1)
(2)
(3)
(4)
(b)
(1)
(2)
(3)
,.
(4)
(c)
(1)
(2)
(3)
(4)
(d)
—
Tracking balance adjustment
Connect an oscilloscope to TP103 (TE).
Play the test disc.
Push the FORWARD SEARCH button.
Keep the button pushed and adjust SVR 11 (T.
Balance) until the track-jump TE-waves on Tpl 03 are
symmetrical referred to OV.
Checking the Focus gain
Connect an oscilloscope via the band-pass filter to
TP102 (FE).
Play the test disc.
Connect an AF-oscillator via a 120k ohm resistor to
pin 24 of IC1OI.
Frequency = 400Hz, amplitude = 500
mV RMS.
Check the average 400 Hz FE-signal amplitude on
TP1 02, measured through the band-pass filter, is
500m Vp-p * 3dB.
Checking the Tracking gain
Connect an oscilloscope via the band-pass filter to
TP103 (TE).
Play the test disc.
Connect an AF-oscillator via a 47K ohm resistor to
pin 140flC101.
Frequency = 400Hz, amplitude = 500 mV
RMS.
Check the average 400 Hz TE-signal amplitude on
TP1 03, measured through the band-pass filter, is
500m Vp-p &
3dB.
-. ....
Checking the eye pattern
The adjustments (a)-(c) complete the adjustments of
the CD player.
Next, check the eye pattern wavetorm.
TP103
(+)
o
SCOPE
TP104 O
(-f
TP103
(TE)
T’=%EI
Iclol @
B.P. F.
(+)
~,
TP102 0
IN
TP104 o
(-)
TP=$LEI
Iclol @
B.P. F.
..-(+)
(+)
7
TP103-0
IN
OUT SCOPE
TP104 0—<
(-)
T
Measuring
Test
Output connection
instrument
disc
“ Eye “ pattern
point
● Check to be sure that the” eye U pat-
Oscilloscope
F30L-
TP101 ((RF)
tern is at the center of the waveform
50146 TP104 (GND)
and that the diamond shapeis clear-
ly defined.
,,.
,...
...
.. ..
–22-
TP101
(+)
0
1