Akai CT2870 TV

test the horiz out transistor

I located the schematics again.

Does anyone know if the primary switch mode power supply is independent of the line output oscillator and LOPT ? so could / should work with just a load but not a feed ?. I imagine not as that would mean 2 HV squarish oscillator frequencies and potential beat problems in audio or something.

Anyone aware of elecronic German to English machine translator/ dictionary ? as a lot of German legends on the overlay etc

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

I dug out the data sheet for the TEA2164 primary switch mode ps processor and it takes a feed from the line o/p oscillator IC. It has numerous protection trips so I'll have to check for overload. As its desoldered , firstly without the LOPT BU508A in there, and see if there is anything on the LV regulators fed from the primary ps.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

on

is this an ITT nokia chassis? euromono? core 2? have you connected a bulb on the HOT c-e terminals with it removed? any b+? i seem to recall having similar trouble with a core 2 chassis- poor startup- resoldered a series thermistor in the psu and i think there was a mod with a 1uf cap between gnd and a pion off the smps control chip...anway lets not get ahead of ourselves. see if theres any b+

-Ben

processor

its

is

on

Similar or same as Pioneer SD 21/25/28 AVI

Sounds plausible remedies. Unfortunately other repair work is now taking precedence and it has become a back-burner job.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on