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There are currently no product reviews.
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Great PDF easy to read good info needed for replacment of belts and assembly and specs.
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complete and unabridged very good quality
easy to download.
recieved in two days.
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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.
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perfect copy, im very satisfied, i was need the diagram over the powersupply and
the copy was very sharp
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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.
VERTÄ°CAL DEFLECTION CIRCUIT DEFECTS
There is a horizontal line on the screen
Check 16 VDC at pin 3 of IC501.
NO
Check and replace R127 (at pin 20 of IC101), C126 (at pin 21 of IC101), R526, D513, C527, R521.
YES
Check 35 VDC at pin 6 of IC501.
NO
Flyback lines are visible. Check and replace R527, D512, C526, R522, C517.
YES
Check 2.2 VDC at pin 1 of IC501.
NO
If R122 is open IC501 becomes defective and 16 VDC components fail. Check them before replacing IC501.
YES
Check 2.2 VDC at pin 2 of IC501.
NO
Lower half of the screen is black. Check and replace R123 and IC101.
YES NO
Check 7.4 VDC at pin 7 of IC501. Check 7.2 VDC at pin 4 of IC501.
A Horizontal line is visible. Check and replace R518, R519 and IC501.
YES
Replace IC501
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