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« on: 27 February 2023, 11:46:44 »
hi.a question to any car radio engineers please.i hope someone can help.
i have a blaupunkt san diego dj head unit (radio,cassette).this is the type that has various other connotations such as milano rcr127,st malo rcm127,etc .fitted with the 8638308752 pcb from circa mid/late 90's. ? the one with the removable front,4x35w ,2 egg shaped 4 button controls to the left.
hope that has identified the unit !
i have a few of these in various cars and am having an issue with one of them.
radio crystal clear,remote cd changer perfect .all 4 amp channels perfect.
issue is with very distorted (gritty sounding) cassette on both channels. i have exchanged cassette decks from other unit. problem not on deck.
i have also swapped the 8 pin op amp in the top right corner of the board. voltage to this chip vcc is same on both units 8.54v.. also virtually all the electrolytics. still the problem remains.