MHC-V77DW
MHC-V77DW
3636
Note on Schematic Diagram:
• All capacitors are in μF 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
specifi ed.
•
2
: nonfl 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 MΩ).
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 identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi 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.
CE
Q
B
These are omitted.
CE
Q
• Waveforms
– BENTEN-MOTHERBOARD Board – – 89G Board –
3.4 Vp-p
20.8 Ps
3
IC6407 7 (LRCK)
500 mV/DIV, 5 Ps/DIV
3.4 Vp-p
20.8 Ps
6
IC6409 qg (LRCK)
500 mV/DIV, 5 Ps/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 Ps
8
IC6901 qh (BOOT2)
5 V/DIV, 10 Ps/DIV
14.8 Vp-p
6.4 Ps
9
IC6901 wg (BOOT1)
5 V/DIV, 10 Ps/DIV
14.8 Vp-p
6.4 Ps
0
IC6904 2 (VBST1)
5 V/DIV, 500 ns/DIV
14.8 Vp-p
6.4 Ps
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 Ps
1
IC6405 7 (LRCK)
500 mV/DIV, 5 Ps/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).
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