Read Sony CFD-V77S (serv.man2) Service Manual online
CFD-V77S
Focus Bias Check
This check is to be done when the optical block replaced.
Check Procedure:
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
MAIN board. Insert disk (YEDS-18).
2. Put the set into test mode.
3. Opitical pick-up setting to the center by + or – button pushing.
4. Press the u button and press the DISPLAY ENTER button.
3. Opitical pick-up setting to the center by + or – button pushing.
4. Press the u button and press the DISPLAY ENTER button.
(Tracking servo ON)
5. Check that the oscilloscope wavewform is as shown in the figure
below (eye pattern).
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
6. Release test mode after adjustment is completed.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensivity.
and raise vertical sensivity.
[MAIN BOARD] (Conductor side)
TRAVERSE Check
This check is to be done when the optical pick-up block is replaced.
Check Procedure:
1.
1.
Connect the oscilloscope to test point TP (VC) and TP (TE) on
MAIN board. Insert disk (YEDS-18) .
MAIN board. Insert disk (YEDS-18) .
2.
Put the set into test mode.
3.
Optical pick-up setting to the center by > or . button
pushing.
pushing.
4.
Press u button.
5.
Check that the oscilloscope traverse waveform is symmetrical,
as shown in the figure below.
as shown in the figure below.
6.
Release test mode after adjustment is completed.
[MAIN BOARD] (Conductor side)
VOLT/DIV : 0.2V
TIME/DIV : 500ns
TIME/DIV : 500ns
1.1Vp-p – 1.3Vp-p
— 3 —
— 4 —
— 5 —
— 6 —
SECTION 2
DIAGRAMS
2-1. BLOCK DIAGRAM
VOLT/DIV : 0.1V
TIME/DIV : 1ms
1.0V-2.0V
TIME/DIV : 1ms
1.0V-2.0V
TP
(VC)
(VC)
TP
(FE)
(FE)
TP
(RF)
(RF)
TP
(TE)
(TE)
+
–
–
Oscilloscope
(DC range)
TP (VC)
TP (TE)
TP (FE)
TP
(VC)
(VC)
TP
(FE)
(FE)
TP
(RF)
(RF)
TP
(TE)
(TE)
+
–
–
Oscilloscope
(DC range)
TP (VC)
TP (RF)
VOLTAGE
SELECTION
BOARD
E,EA,SP MODELS
AEP, IT, CET MODELS
CNB907
3
MONO ST
BOARD
BOARD
AEP, IT , CET MODEL
RFO
OPTICAL PICK-UP
BLOCK
(KSM-880DAA)
5
7
6
4
8
3
10
12
14
15
13
16
CNB701
3
4
1
2
5
6
CNP702
1-4
5-18
CNP801
CNJ804
LCD BOARD
CONTROL BOARD
1
11
12
14
13
15
16
27 SSTP
5 A
6 B
8 D
7 C
10
11
3
4
12
24
30 TFDR
20
14 XLON
23
31 TRDR
5
32 FFDR
6
33 FRDR
2
28 SFDR
3
29 SRDR
25
26 MDP
MUTE
16
51 RFAC
FE 14
3
FE
30
1
RST
SENS 8
5
SENS
SCOR 20
1
SCOR
SCLK 9
6
SCLK
SQCK 2
7
SQCK
SQSO 1
8
SQSO
XRST 3
9
XRST
CLOK 7
10 CLOCK
XLAT 6
11 LATCH
DATA 5
12 DATA
13 AGCCONT
TE 13
LD ON 22
41 TE
40 SE
AGCCONT 20
67
66
X701
16.9344MHz
IC702
DIGITAL SERVO
DIGITAL SIGNAL PROCESSOR
LOUT1 72
LOUT2 75
IC801
LCD DRIVE
SYSTEM CONTROL
IC802
RESET
14
REC
3
MUTE
2
DOOR
CNP803
22
KEY-1
KEY
SWITCH
S803-806
23
KEY-2
KEY
SWITCH
S801,802
41
38
55
42
XTAI
XTAO
31
32
X801
4MHz
XTAL
EXTAL
RF AMP
1
3
5
CONT
VM
VOUT
IC401
POWER CONTROL
VOLTAGE
CONTROL
Q402
VOLTAGE
CONTROL
Q405
(LOADING)
• Abbreviation
EA
: Saudi Arabia model.
SP
: Singapore model.
IT
: Italian model.
CET
: East European and Russian model.
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