Sony HCD-CP11 - Page 45

2. CD MECHANISM DECK (CDM55D-K5BD41) ADDITION
ELECTRICAL ADJUSTMENT
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MQ impedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
5. Check the focus bias check when optical pick-up block is replaced.
-CD BOARD (Conductor Side) —
Focus Bias Check
oscilloscope
(DC range)
BD board
aon
TP (RF) <——0+
TP (VC) «——‘-
IC103
Procedure : O TP (RF)
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the button to turn the power on, and press the [4]
(CD) button to open the CD disc tray. OTP (VC)
3. Put disc (YEDS-18) in and press the[>l](CD) button to play-
back.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (©) in the
center of the waveform can be clearly distinguished.
RN
RN
[mie
ao
\\
i
1)
VHA
\)
LOO VY
900007 —F VOLT/DIV: 200 mv
AY
level:
1.2+ 0.1 Vp-p
NOs
DODOLLOS
Checking Location:
e Waveforms
— CD Board —
@ C103 @ (RFO) (CD Play Mod
BS 525 25256
@ C103 @ (FE) (CD Play Mode)
i
© 1C103 @ (TE) (CD Play Mode)
7
© 1C101 @ (WFCK)
136 us
© 1C101 @ (XPCK)
230 ns
ice)
NX
KANNAN
RRR:
SOR
:
le)
1.2+0.1 Vp-p
1
Approx.
200 mVp-p
a
Approx.
380 mVp-p
5.1 Vp-p
5.9 Vp-p
@ C101 @ (SCOR) (CD Play Mode)
bel cf
5V
Lidincleteuel
| cas
13.2 ms
@ 1C101 @ (XTAI)
Peavacal
3 Vp-p
16.9344 MHz