Very pleased with manual except that a few more details in the drawings might make the job (not yet done, tut-tut) easier. Should be adequate though. Actually I didn't have to pay for this anyway as I was given credit for another item that wasn't quite complete. Good service, then.
Very useful manuals, somewhere graphics not very clear!
Text excerpt from page 4 (click to view)
KDC-5021/5021V,506
COMPONENT DESCRIPTION
SWITCH UNIT (X16-167x-xx)
REF. No. IC1 IC2 Q1 Q2 Q3 Q4 FUNCTION LCD DRIVER REMOTE CONTROLLER KEY SCAN START IC2 POWER SUPPLY SW KEY GREEN ILLUMI SW KEY RED ILLUMI SW OPERATION Drives LCD. Controls the unit. Turns on when the base level goes "L". Turns on when the base level goes "L". Turns on when the base level goes "H". Turns on when the base level goes "H".