Awesome manual. Complete diagrams of all board assemblies as well as how to get to each part of the t.v. down to the individual screws and their locations. Get it.
This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
Text excerpt from page 95 (click to view)
http://getMANUAL.com
3-3. Troubleshooting 3-3-4. Test Procedures
(3) Checking the test result Check the followings on each item of the �AND test�. (a) �1. Fill AND MEMORY with W.� Check that all alphanumeric displays are filled with the letter �W�. (b) �2. Fill AND MEMORY with M.� Check that all alphanumeric displays are filled with the letter �M�. (c) �3. Fill AND MEMORY with BLANK.� Check that all alphanumeric displays light off. (d) �4. Fill AND MEMORY with FULL.� Check that all dots of all alphanumeric displays light up. (e) �5. Lum level = 3� Check that it is possible to adjust the brightness level 3 model (the 1st brightness). (f) �6. Lum level = 2� Check that it is possible to adjust the brightness level 2 model (the 2nd brightness). (g) �7. Lum level = 1� Check that it is possible to adjust the brightness level 1 model (the 2nd darkness). (h) �8. Lum level = 0� Check that it is possible to adjust the brightness level 2 model (the 1st darkness). (4) Ending the �And test� Press your required terminal button to return to the �H/W Tester on CPU-263� menu.