Read Sony HMD-A400 Service Manual online
HV Regulator
Circuit Check
Circuit Check
HV Hold-down
Circuit Check
Circuit Check
Beam Current
Protector Circuit
Check
Protector Circuit
Check
Part Replaced (
]
)
D board IC502, R515,
T501 (FBT)
•
Mounted D board
D board D538, IC901, Q534,
R521, R551, R552,
R598, R599,
T501 (FBT)
R598, R599,
T501 (FBT)
•
Mounted D board
D board IC901, R911, R949,
R950, T501 (FBT)
•
Mounted D board
5-7
5-8
5-4. SCHEMATIC DIAGRAMS AND PRINTED
WIRING BOARDS
Note:
•
All capacitors are in µF unless otherwise noted. (pF: µµF)
Capacitors without voltage indication are all 50 V.
•
Indication of resistance, which does not have one for rating
electrical power, is as follows.
Pitch: 5 mm
Rating electrical power 1/4 W (CHIP : 1/10 W)
• All resistors are in ohms.
•
f
: nonflammable resistor.
•
F
: fusible resistor.
•
f
: internal component.
•
p
: panel designation, and adjustment for repair.
• All variable and adjustable resistors have characteristic curve B,
unless otherwise noted.
•
e
: earth-ground.
•
E
: earth-chassis.
• All voltages are in V.
• Readings are taken with a 10 M digital multimeter.
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal production
tolerances.
•
*
: Can not be measured.
• Circled numbers are waveform references.
•
s
: B + bus.
•
S
: B – bus.
• When replacing components identified by
]
, make the
necessary adjustments indicated. (See page 3-1)
• When replacing the part in below table, be sure to perform the
related adjustment.
•
Divided circuit diagram
One sheet of D board circuit diagram is divided into six
sheets, each having the code D-
a
to D-
f
. For example, the
destination ab1 on the D- a sheet is connected to ab1 on the
D-
b
sheet.
b
1
a
Ref. No.
Circuit diagram division code
Note: The components identified by shading and mark
0
are critical for safety. Replace only with part
number specified.
Note: Les composants identifiés par un tramé et une
marque
0
sont critiques pour la sécurité. Ne les
remplacer que par une pièce portant le numéro
spécifié.
spécifié.
Schematic diagram
Board
l
l
l
l
l
H
(1) Schematic Diagram of H Board
1
A
B
C
D
2
7
6
5
4
3
1
2
3
4
P701
4P
MENU
GND
ORANGE/LED
GREEN/LED
R709
10.2k
1%
R705
6.19k
R702
15k
1%
H
(USER CONTROL)
6
3
5
4
2
R706
3.83k
R701
2.15k
1%
1
LED701
LT6463-23-D51
SW701
B-SS3578<U/C>-H..-EPS05
(POWER)
TO D-a BOARD
CN901
MENU
(h)
USER CONTROL
— H BOARD —
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