Sony AC-LF1HR / DAV-LF1H Service Manual ▷ View online
7
AC-LF1HR
3
POWER SWITCH
(LFZ) board
(LFZ) board
7
SW LED board
q;
spring (button)
4
two screws
(+BVTP 2.6
(+BVTP 2.6
×
8)
5
screw
(+BVTP 2.6
(+BVTP 2.6
×
8)
1
three screws
(+BVTP 2.6
(+BVTP 2.6
×
8)
2
Remove soldering
from the two points.
from the two points.
6
connector
(CN905)
qa
8
two claws
9
power button
button holder
3-4. POWER SWITCH (LFZ) BOARD AND SW LED BOARD
8
AC-LF1HR
2
Remove the top cover and
power sheet (upper)
in the direction of the arrow
power sheet (upper)
in the direction of the arrow
C
.
3
top cover,
power sheet (upper)
power sheet (upper)
4
top cabinet
1
Stretch the top cabinet in the direction
of the arrows
of the arrows
A
and
B
.
B
A
top cabinet
C
5
two saranet cushions
6
harnesses
top cover
3-5. TOP CABINET
9
9
AC-LF1HR
AC-LF1HR
SECTION 4
DIAGRAMS
Note on Schematic Diagrams:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor.
• Note for Printed Wiring Boards and Schematic Diagrams
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
Note:
The components identified by
mark
mark
0
or dotted line with
mark
0
are critical for safety.
Replace only with part num-
ber specified.
ber specified.
Note:
Les composants identifiés par
une marque
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro spécifié.
Ne les remplacer que par une
piéce portant le numéro spécifié.
•
IC Block Diagrams
– DIAT POWER Board –
D 1
NC 2
S/GND 3
VCC 4
OLP/SS 5
FB 6
OCP/BD 7
DELAY
Q
R
S
+
–
+
–
+
–
Q
S
R
+
–
BOTTOM
SELECTOR
COUNTER
OSC
R
Q
S
SOFT START
+
–
OVP
REGULATOR
& ICONST
+
–
BURST
CONTROL
START/STOP
BURST
PROTECTION
LATCH
DRIVE
REGULATOR
OLP
BSD
BD
OCP
FB
IC901 STR-W6735N (US, CND, MX, TW)
STR-W6765N (EXCEPT US, CND, MX, TW)
C
B
These are omitted.
E
Q
Ver. 1.2
•
A
: B+ Line.
• Voltages are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Signal path.
F
: AUDIO
• Abbreviation
CND
: Canadian model
MX
: Mexican model
TW
: Taiwan model
10
10
AC-LF1HR
AC-LF1HR
• Signal Path
: AUDIO
T901
PC902
D911
D901
F901
S901
LF901
AC
IN
D921
R946
D900
J902
AC-CUT
SA-TSLF1H
TH901
Q901
REG
PC901
PC903
IC905
+2.5V REG
D910
Q902
SWITCH
Q903
SWITCH
6 FB
3 S/GND
4 VCC
1 D
7 DCP/BD
5 OLP/SS
TH902
IC903
+7.8V REG
V-CONT
MAIN-OFF
IC901
SWITCHING REG
R945
POWER
POWER
4
5
6
7
1
8
9
2
3
10
J901
DIR-R3
Q906
SWITCH
LF902
JW922
EXCEPT US, CND, MX, TW
US, CND, MX, TW
JW921
4-1. BLOCK DIAGRAM
Ver. 1.1
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