trainman87 |
Posted: Fri Jul 23, 2010 1:20 pm Post subject: zenith xbs444 overheating |
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info for anyone who owns a zenith xbs444 dvd/vcr/tuner combo,, and the unit shuts off after a short period,, due to the voltage regulators overheating,,,i have found an alternative fix without having to replace the regulators,,,being that the problem is they are sensitive and affected very quickly by the heat,,,airflow is essensial,,, step 1: remove the fan,, then connect the black wire to a closeby point on the frame,, a good spot would be the brace screw for the circuit board nearby,, this will keep the fan running at all times,,,step 2: use some tape to cover the open holes on the bottom frame panel, and then cover at least 75 percent of the larger vents on the right rear side of the cover,,,step 3: make sure the cover is replaced nice and tight all around,,this will create a larger airflow through the vents for the regulators,,,i have done this , and it works,,,not a problem since!! |
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Moneyguy1 |
Posted: Fri Jun 04, 2010 4:19 pm Post subject: Failing XBS444 |
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Replace the voltage regulators on the audio output board. They are NTIS designated 7805, 7809, 7812. The last two numbers designate the regulated voltage. The most probable culprit are the 5 volt units. IC 705, 706, 707 are 5 volt (7805). IC702 is 9 volt(7809) IC 703 is 12 volt(7812). About a buck apiece |
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