Sony MHC-V5 (serv.man3) Service Manual ▷ View online
25
3-12. Circuit operation (Emergency 2)
Page 41
E5: If +61V/-61V for AMP
circuit is not supplied,
System controller
shows error message of
“PROTECT E03“.
circuit is not supplied,
System controller
shows error message of
“PROTECT E03“.
E7: If over current is
detected in USB
connection circuit,
System controller
shows error
message of
“OVER CURRENT“.
detected in USB
connection circuit,
System controller
shows error
message of
“OVER CURRENT“.
E6: A thermistor near to ventilator
detects the input air condition.
And, speaker voice coil
temperature is calculated with
playback condition and so on.
Then, System controller (IC101)
adjust the sound level
automatically.
detects the input air condition.
And, speaker voice coil
temperature is calculated with
playback condition and so on.
Then, System controller (IC101)
adjust the sound level
automatically.
E4: If Thermistors near to the boosters
on AMP board detect high
temperature of AMP circuit,
System controller show error
message of “Protector E05”.
on AMP board detect high
temperature of AMP circuit,
System controller show error
message of “Protector E05”.
E9: If AC cord is pull off,
it is detected by SWR
board and output to
System controller.
System controller
starts shut down
operation.
(Muting, etc.)
it is detected by SWR
board and output to
System controller.
System controller
starts shut down
operation.
(Muting, etc.)
26
Middle layer
D-AMP board
ARAGON board
SWR board
4-1. Construction
Top layer
CDM
Bottom layer
Disassembly order
This white cover part is deleted
in the latest versiion.
in the latest versiion.
4-2. Check point in ARAGON board
27
System controller
Repair tips:
EVER+3.3V output for
System controller can be
checked at connecter
terminal. (CN304 pin1 and 2)
EVER+3.3V output for
System controller can be
checked at connecter
terminal. (CN304 pin1 and 2)
Repair tips:
13.5V output from SWR board
for System controller can be
checked at connecter
terminal (CN001 pin1 and 3)
13.5V output from SWR board
for System controller can be
checked at connecter
terminal (CN001 pin1 and 3)
Audio processor
Serial Flash for
Audio processor
Audio processor
DC/DC converter
for EVER +3.3V
for EVER +3.3V
USB HUB
controller
controller
Troubleshooting:
Remove this cable from SWR
board and connect AC plug of
MHC-V5 to a wall outlet.
If 13.5V output is not output
from SWR board, SWR board
is damaged.
Remove this cable from SWR
board and connect AC plug of
MHC-V5 to a wall outlet.
If 13.5V output is not output
from SWR board, SWR board
is damaged.
DC/DC converter
for 5V (USB/Motor)
for 5V (USB/Motor)
Thermistor
to check input air
from ventilator
to check input air
from ventilator
28
4-3. Check point in D-AMP board
Repair tips:
After removing speaker cables,
compare the resistance between
each connector terminals to check
each amplifier circuit condition.
After removing speaker cables,
compare the resistance between
each connector terminals to check
each amplifier circuit condition.
Approx. 10k-30k ohm => OK
As the resistance increases while
checking, measure it soon.
If short circuit or special high
resistance is found, the applicable
signal line’s circuit may be damaged.
(Booster, AUDIO AMP, etc.)
checking, measure it soon.
If short circuit or special high
resistance is found, the applicable
signal line’s circuit may be damaged.
(Booster, AUDIO AMP, etc.)
SW (1 & 2pin)
Pin3 is open.
Pin3 is open.
FR
FL
PRE AMP
AUDIO AMP
Booster
+5/-5V REG
Repair tips:
When AMP circuit is damaged,
AUDIO AMP or booster may be
broken in only one signal line.
So, compare each signal line
resistance to check the condition.
If signal lines’ resistances are similar,
check Regulators for AMP circuit.
When AMP circuit is damaged,
AUDIO AMP or booster may be
broken in only one signal line.
So, compare each signal line
resistance to check the condition.
If signal lines’ resistances are similar,
check Regulators for AMP circuit.
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