Question about Sony STR-DE998 7.1 Channels Receiver

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Amp lights up (display) and then fails to switch

Amp lights up (display) when turned on, however, it then fails to switch to power up followed immediately by the "protector" warning display. There were no problems prior to this. the amp is about two years old with average use..

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The amp monitors its output circuits to make sure there is no DC voltage across the speakers .. that would damage the speaker ... if it finds such a voltage it disconnects all the speakers and turns on the "protector" display ... this problem is often caused by the failure of one of the power output modules (one for each speaker).. one failure will shut down all .. a technician can identify which module is bad by measureing the voltage at the ouput of each .. they should all be nearly 0 volts .. the defective one will likely measure a very high value .. perhaps 40 volts or so ... the defective power module would have to be replaced.

Posted on Jul 24, 2009

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You need to replace the power amp transistor or mosfet. Bring to electronic technician for repair.

Posted on Jul 24, 2009

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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do the following steps: God bless you
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REGULAR WASH = Water filling fault (over or under filling)
RINSE & HOLD = NTC (temperature sensor) fault ? note circulation motor stops shortly after it started during an NTC fault
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If water level switch (f1) has failed (opened), REGULAR WASH light will come on and unit will continually fill and drain where testing won't be completed. If flow switch (e5) has failed (opened), water won't heat (to 150?F) and water won?t stop circulating. If NTC probe (f2/f4) has failed (opened), RINSE & HOLD light will come on immediately and testing will end shortly after water has started circulating.
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1 Answer

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Light's on mean you have power.

Initiate the self test program by doing the following -

To start test program, press and hold both POWER SCRUB PLUS and RINSE & HOLD program buttons, then turn unit on
by pressing ON/OFF button. When program buttons are released, lights above them will flash. To end test program, press
ON/OFF button.
To check program indicator lights (POWER SCRUB PLUS, REGULAR WASH and RINSE & HOLD), press and hold each
program button. When REGULAR WASH program button is pressed, CLEAN light also comes on.
To start testing, press both POWER SCRUB PLUS and RINSE & HOLD buttons a second time. When testing has ended
and a fault was detected, the following indicator lights will be lit:
POWER SCRUB PLUS = Heater fault
REGULAR WASH = Water filling fault (over or under filling)
RINSE & HOLD = NTC (temperature sensor) fault – note circulation motor stops shortly after it started
during an NTC fault
To check for heater, high limit or flow switch problems, start testing until heating starts. Using a meter with a current coil,
measure current going into dishwasher. If current is ~ 11 A, then heater, high limit and flow switch are OK. If current stays
at ~ 1.5-2 A, then heater, high limit or flow switch are faulty.
If water level switch (f1) has failed (opened), REGULAR WASH light will come on and unit will continually fill and drain
where testing won't be completed. If flow switch (e5) has failed (opened), water won't heat (to 150ºF) and water won’t stop
circulating. If NTC probe (f2/f4) has failed (opened), RINSE & HOLD light will come on immediately and testing will end
shortly after water has started circulating.
If more than one fault occurs, more than one light will be lit.

Let me know what you figure out. I can repair these boards most of the time.

Dec 18, 2009 | Bosch 24 in. SHE44C02UC / SHE44C06UC /...

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