I have a cct manual for the 203 which apart from the circuitry
relating to the second channel is vertualy the same as the 103
Incidently a common problem with these ,non-flyback suppression
etc is failure of the opto-isolator.
please contact e-mail or telephone me the proprietor of
Diverse Devices,Southampton,England;telephone /Fax (+44) (-0)1703 584680
(Shop stocking obscure/obsolete components,second hand test equipment,schematics etc)
Postal: 75 Priory Rd,St Denys,Southampton,England SO17 2JQ.
email
div...@tcp.co.ukhints/tips on homepage
http://www.tcp.co.uk/~diverse/regards, Nigel