This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
Text excerpt from page 36 (click to view)
5-2-7 Poor Focus
Adjust focus VR.
Aging monitor and check for focus change.
No Check focus leads from FBT to CRT Socket.
Check the CRT Socket.
Is dynamic focus circuit right?
Refer to 5-1-15 Dynamic Focus Failure.
Yes Replace the CRT and verify focus.
5-2-8 Purity Failure
Purity is right?
No Degaussing circuit is right? No Refer to 5-1-20 Degaussing Failure.