Needs help. replacing SM5840 with SM5842

[vadimgal]

HI guys,
Could somebody help me out to replace SM5840 digital filter with SM5842 in the TEAC VRDS 10 CD PLayer. I have all schematics.
THank you very much.

[rfbrw]

Lets see the schematic.

[vadimgal]

HI ,
the file is too big.
let me know your e E-mail address.
Thanks,
Vadimgal

[rfbrw]

rfbrw AT clara DOT co DOT uk

[rfbrw]

Below is a diagram showing the SM5842. The mute pins are set to the off position as are the deemphasis pins. Dither is also switched off.
Normally deemphasis and mute, if it is used, are controlled automatically by the preceding ic's. In the case of the SM5840, this is done via a microcontroller. If you want to retain automatic control you will need to connect the pins on the ic's that generate the deemphasis and mute flags to the SM5842 or use a microcontroller to decode commands intended for the SM5840 and then use it set the mute and deemphasis pins on the SM5842. Also note that the SM5842, unlike the SM5840, has no volume control capability, so if that function was in use it will now be unavailable.

[vadimgal]

THANKS a lot for your help.
vadimgal.