Technics Tuner Amp Dead

[Zakes]

Hi there! I have a Technics Tuner Amp Model: SA-EHS70 which has gone
dead. There's red LED indicating that the power from the wall socket is
present. I tested the power supply environment but found no fault.
Before the equipment stopped functioning, it had a problem with sound,
a distorted sound. Now when I switch it on, I can only hear the click
of sound from the speakers only once and that's all. Every time I
swicth the power button I will hear that sound and the LED will remain
on with no display on the panels.

Zakes

 

[JANA]

This sounds like failed components in both the power supply, and the output
stage. These areas can be a challenge for an experienced tech to service.
You should take the unit to a service centre to have a proper estimate done
for you.

--

JANA
_____


Hi there! I have a Technics Tuner Amp Model: SA-EHS70 which has gone
dead. There's red LED indicating that the power from the wall socket is
present. I tested the power supply environment but found no fault.
Before the equipment stopped functioning, it had a problem with sound,
a distorted sound. Now when I switch it on, I can only hear the click
of sound from the speakers only once and that's all. Every time I
swicth the power button I will hear that sound and the LED will remain
on with no display on the panels.

Zakes

 

[DaveM]

This sounds like failed components in both the power supply, and the output
stage. These areas can be a challenge for an experienced tech to service.
You should take the unit to a service centre to have a proper estimate done
for you.

--

JANA
_____


Hi there! I have a Technics Tuner Amp Model: SA-EHS70 which has gone
dead. There's red LED indicating that the power from the wall socket is
present. I tested the power supply environment but found no fault.
Before the equipment stopped functioning, it had a problem with sound,
a distorted sound. Now when I switch it on, I can only hear the click
of sound from the speakers only once and that's all. Every time I
swicth the power button I will hear that sound and the LED will remain
on with no display on the panels.

Zakes

Does this unit have remote control capability? If so, your symptoms are exactly
as I experienced a couple years ago with a Radio Shack/RCA tuner-amp. On power
application, the front panel display was lit (the unit was in standby mode).
When the power switch was pressed, a relay clicked and everything went dark.
Turned out to be a bad power transformer. There was a standby power supply that
kept the remote control circuits and display alive during standby. When the
power switch was pressed, the power relay energized, transferring power to the
main power supply, which was dead because of the power transformer. The power
transformer had an open primary. I tried to open it to see if the over-temp
fuse was open, but the windings were potted in hard plastic.

Turned out that RS wanted more for the transformer than a replacement tuner-amp
would have cost. I turned the unit into a parts supply.
Cheers!!!!

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Some days you're the dog, some days the hydrant.