Sony FDL-E22 Service Manual ▷ View online
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8
–
MEASUREMENT
POSITION
ADJUSTMENT
LOCATION
ILLUSTRATION AND SHAPE
AND NUMBER
ADJUSTMENT ITEM AND PROCEDURE
EQUIPMENT
AND SIGNAL
B BOARD ADJUSTMENT
– B BOARD – (COMPONENT SIDE)
RV402
RV301
GRAY SCALE SIGNAL ADJUSTMENT
1. Receive a *signal
2. Check and confirm waveform at *JL30 by *oscilloscope to be in
the *specification.
3. Connect oscilloscope CH1 to *JL34, then vary *RV and confirm
picture contrast of screen changes relevantly.
4. Connect oscilloscope CH2 to *JL40, then adjust amplitude of A
by *RV to be in the *specification.
5. Connect oscilloscpe CH2 to *JL40 and confirm leading edges of
C and D to be in the area of Å©Å® .
* 10-gradation
gray scale
* Oscilloscope
gray scale
* Oscilloscope
*JL30 (VIDEO)
*JL34(G)
*JL40 (AUTO C)
*JL40 (AUTO C)
*RV402
*RV402
JL34
(CH1)
JL40
(CH2)
0 IRE
100 IRE
C
D
*
A=1.8
A=1.8
±
0.2V
Picture contrast
is varies.
is varies.
*0.62 ± 0.05Vp-p (0 IRE - 100 IRE)
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9
–
MEASUREMENT
POSITION
ADJUSTMENT
LOCATION
ILLUSTRATION AND SHAPE
AND NUMBER
ADJUSTMENT ITEM AND PROCEDURE
EQUIPMENT
AND SIGNAL
HUE ADJUSTMENT
1. Receive a *signal.
2. Connect a *oscilloscope to *JL32.
3. Adjust waveform by *RV to be *Fig 3 or *Fig 4.
2. Connect a *oscilloscope to *JL32.
3. Adjust waveform by *RV to be *Fig 3 or *Fig 4.
* Color-bar
* Oscilloscope
* Oscilloscope
*JL32 (B)
*RV301
Small wize
line
line
Fig 3.
Fig 4.
– 12 –
4-2. CIRCUIT BOARDS LOCATION
Reference information
RESISTOR
: RN
METAL FILM
: RC
SOLID
: FPRD NONFLAMMABLE CARBON
: FUSE NONFLAMMABLE FUSIBLE
: RW
NONFLAMMABLE WIREWOUND
: RS
NONFLAMMABLE METAL OXIDE
: RB
NONFLAMMABLE CEMENT
:
ADJUSTMENT RESISTOR
COIL
: LF-8L
MICRO INDUCTOR
CAPACITOR : TA
TANTALUM
: PS
STYROL
: PP
POLYPROPYLENE
: PT
MYLAR
: MPS
METALIZED POLYESTER
: MPP
METALIZED POLYPROPYLENE
: ALB
BIPOLAR
: ALT
HIGH TEMPERATURE
: ALR
HIGH RIPPLE
Note: The components identified by shading and mark
are critical for safety. Replace only with part number
specified.
specified.
Note:
• All capacitors are in
µ
F unless otherwise noted. pF :
µµ
F 50WV or less are not
indicated except for electrolytics and tantalums.
• All electrolytics are in 50V unless otherwise specified.
• All resistors are in ohms.
k
Ω
=1000
Ω
, M
Ω
=1000k
Ω
• Indication of resistance, which dose not have one for rating electrical power, is
as follows.
Pitch : 5mm
Rating electrical power :
1
/
4
W (CHIP :
1
/
10
W)
•
: internal component.
•
: panel designation and adjustment for repair.
• All variable and adjustable resistors have characteristic curve B, unless otherwise
noted.
• As to the voltage volue shown by the semiconductors on the Shematic Diagram,
see the another list
• Readings are taken with a color-bar signal input.
• Readings are taken with a 10M
Ω
digital multimeter.
• Voltages are dc with respect to ground unless otherwise noted.
• Voltage variations may be noted due to normal production tolerances.
• All voltages are in V.
*
: Measurement impossibillity.
•
v
: B+line.
•
: signal path.
• Circled numbers are waveform references.
4-3. PRINTED WIRING BOARDS AND SCHEMATIC
DIAGRAMS
Note: Les composants identifiés per un tramé et une marque
sont critiques pour la sécurité. Ne les remplacer
que par une piéce portant le numéro spécifié.
B
A
L
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