MHC-V77DW
MHC-V77DW
36
36
Note on Schematic Diagram:
• All capacitors are in
μ
F unless otherwise noted. (p: pF)
50 V or less are not indicated except for electrolytics
and
tantalums.
• All resistors are in
and
1
/
4
W or less unless otherwise
speci
fi
ed.
•
2
: non
fl
ammable resistor.
•
C
: panel designation.
• Note for Printed Wiring Boards and Schematic Diagrams
•
A
: B+ Line.
•
B
: B– Line.
•
H
: Adjustment for repair.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
:
AUDIO
f
:
TUNER
(FM/AM)
L
:
VIDEO
E
:
USB
d
:
LAN
J
: CD PLAY
N
:
MIC
• Abbreviation
AUS : Australian
model
E4
: African
model
EA
: Saudi
Arabia
model
LA9 :
Latin-American
model
MY :
Malaysia
model
RU :
Russian
model
TH
:
Thai
model
Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side:
(Conductor Side)
Parts face side:
(Component Side)
Parts on the pattern face side seen
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
Note:
The components identi
fi
ed by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number speci
fi
ed.
• Abbreviation
AUS : Australian
model
E4
: African
model
EA
: Saudi
Arabia
model
LA9 :
Latin-American
model
MY :
Malaysia
model
RU :
Russian
model
TH
:
Thai
model
C
B
These are omitted.
E
Q
t
Indication of transistor
D
G
These are omitted.
S
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
• Waveforms
– BENTEN-MOTHERBOARD Board –
– 89G Board –
3.4 Vp-p
20.8
P
s
3
IC6407
7
(LRCK)
500 mV/DIV, 5
P
s/DIV
3.4 Vp-p
20.8
P
s
6
IC6409
qg
(LRCK)
500 mV/DIV, 5
P
s/DIV
324 ns
3.6 Vp-p
4
IC6407
8
(BCK)
1 V/DIV, 100 ns/DIV
324 ns
3.6 Vp-p
5
IC6409
qd
(BCK)
1 V/DIV, 100 ns/DIV
qa
IC6904
qg
(VBST2)
5 V/DIV, 500 ns/DIV
17.8 Vp-p
6.4
P
s
8
IC6901
qh
(BOOT2)
5 V/DIV, 10
P
s/DIV
14.8 Vp-p
6.4
P
s
9
IC6901
wg
(BOOT1)
5 V/DIV, 10
P
s/DIV
14.8 Vp-p
6.4
P
s
0
IC6904
2
(VBST1)
5 V/DIV, 500 ns/DIV
14.8 Vp-p
6.4
P
s
324 ns
3.6 Vp-p
2
IC6405
8
(BCK)
1 V/DIV, 100 ns/DIV
qd
IC8003
<zz.
(RFIP)
200 mV/DIV, 100 ns/DIV
(CD play mode)
1 Vp-p
3.4 Vp-p
20.8
P
s
1
IC6405
7
(LRCK)
500 mV/DIV, 5
P
s/DIV
7
IC6602
wf
(CKXTAL2)
200 mV/DIV, 10 ns/DIV
976 mVp-p
25.0 MHz
qs
IC8003
4
(XTALO)
500 mV/DIV, 20 ns/DIV
37.2 ns
1.2 Vp-p
Note 1:
When the C1093 and C1094 on the 2CH DAMP
board are replaced, spread the bond referring
to “BOND FIXATION OF ELECTRIC PARTS” on
servicing notes (page 6).
Note 1:
When the C1093 and C1094 on the 2CH DAMP
board are replaced, spread the bond referring
to “BOND FIXATION OF ELECTRIC PARTS” on
servicing notes (page 6).
Note 2:
When the BENTEN-MOTHERBOARD board
is replaced, refer to “IMPORTANT NOTE OF
REPLACING THE BENTEN-MOTHERBOARD
BOARD” on page 5 and “IMPORTANT NOTE OF
DHSR-SY30 AT BENTEN-MOTHERBOARD
BOARD” on page 6.
Note 2:
When the BENTEN-MOTHERBOARD board
is replaced, refer to “IMPORTANT NOTE OF
REPLACING THE BENTEN-MOTHERBOARD
BOARD” on page 5 and “IMPORTANT NOTE OF
DHSR-SY30 AT BENTEN-MOTHERBOARD
BOARD” on page 6.
Note 3:
When the MS-476 board is defective, exchange
the entire LOADING COMPLETE ASSY (T).
Note 3:
When the MS-476 board is defective, exchange
the entire LOADING COMPLETE ASSY (T).
