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SONY
STR-VX
Series
Circuit
Operation
Power Supply (all models)
The
STR-VX1,
-VX2
and -VX4
employ
conventional
power
supplies.
The
STR-VX5
and -VX6
employ pulse power
supplies.
The
configuration
of the
pulse power
supply is identical to that
of previous
models,
and will not be
discussed
here.
STR-VX3,
-VX4, -VX5
and
-VX6 Protection Circuit
Table 2 summarizes the protection
circuit employed in each model.
The
protection circuits used in the
STR-VX6
will be discussed here.
Table 2.
circuit
|circuit
breaker|breaker
relay
relay | relay | relay
(1.9A)
|(1.9A)
[Some tier
epee [ee
[ne vatage
ouside
| ee [see [ve [oe fe
a
ce
Pie Ds
pa fs
Speaker
Protection
Input Muting
Primary
Fuse
or Circuit
Breaker
In-Rush
Current
Relay
Speaker Protection Relay Drive and Input Muting
A relay is employed
to protect both the
speakers
and the amplifier itself.
The
following events
take place when
the
power
switch is turned
on or turned
off.
Refer to Figure 11.
1. Immediately
after power
switch is
turned
on
Q723
Q726
Q722 OFF 7725 OFF—+Q719 ON-—>input muting ON
Lite cee
ee
ee Fe
—»speaker protection relay OFF
10
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