Read JBL SB 400 Service Manual online
JBL
SB 400 Service Manual
Page 11 of 30
NEW February 2014:
It is now possible to buy the Optic Input PCB separately, without LED+Switch PCB.
New part: ASA3SB4003010-1, OPTIC JACK BOARD PCBA SB400CNTR.
Old part: ASA3SB4003010, LED + SWITCH PCBA SB400CNTR/230
Click on the first or last page to see other SB 400 service manuals if exist.