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Great PDF easy to read good info needed for replacment of belts and assembly and specs.
complete and unabridged very good quality
easy to download.
recieved in two days.
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.
perfect copy, im very satisfied, i was need the diagram over the powersupply and
the copy was very sharp
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.
Removing the audio board (See Fig.10)
Relay board power supply board CN291 Power transformer Power / Fuse board
Prior to performing the following procedure, remove the top cover and the rear panel. 1. Disconnect the card wire from connector CN402 CN403 on the audio board. 2. Disconnect the relay board from the audio board and the power supply board. (CN291, CN491) 3. Disconnect the harness from connector CN471, CN472, CN473. 4. Remove the three screws G board assembly. 5. Remove the screw H assembly. attaching the audio
Audio board CN472 CN471
G CN491 H
attaching the audio board
Removing the main board
Prior to performing the following procedure, remove the top cover, the rear panel and audio board. 1. Disconnect the harness from connector CN241 and CN203 on the power supply board respectively. 2. Disconnect the harness from connector CN251 on the power transformer board . 3. Remove the four screws I and the two screws J attaching the main board.
I J I
Removing the heat sink (See Fig.12 to 14)
Prior to performing the following procedure, remove the top cover and main board. 1. Remove the two screws K attaching the heat sink to the reverse side of main board. 2. Disconnect the for connectors with each amp. board, and remove the main board.
Main board rear side
Front Rch amp. board Heat sink Front Lch amp. board Center amp. board
3. Remove the four screws M and ten screws L Rear Lch amp. board attaching the heat sink. Rear Rch amp. board
CN802 CN801 CN302 CN301