Onkyo T-909 Service Manual covers following topics:
- How to repair Onkyo T-909 Digital Synthesized FM Stereo Tuner?
- How to maintain and fix your Onkyo T-909 Digital Synthesized FM Stereo Tuner?
- Specifications, Precautions, Features, Circuit description, Exploded view,
- Component location, Alignment procedures, Digital section p.c.b. -parts list,
- Digital section-schematic diagram, Pin arrangements for digital IC,
- Tuner-schematic diagram, Tuner p.c.b. view, Tuner p.c.b. -parts list,
- Linear IC block diagram, Power supply p.c.b. view, Block diagram, Packing procedures
Onkyo T-909 Service Manual(Book ID=38436 Added on August 21, 2012) Onkyo T-909 Service Manual covers Repair Guide, Troubleshooting, Parts List, Exploded diagram, Wiring Diagram, Schematics, Assembly and dissembly of equipment. Using Onkyo T-909 Service Manual, you will be able to get answer of common questions regarding equipment like:
- How to open and clean Onkyo T-909 Servic?
- How to fix broken Onkyo T-909 Servic?
- How to solve various error codes?
- How to repair broken parts and various part numbers?
- What is the meaning of various buttons and indicators on device?
- How to carry out alignment and routine servicing of your device?
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Below is example of common troubleshooting you can do using this service manual
Circuit Description of the Onkyo T-909
1. Memory/Scan Selector Switch and Error Detector Circuit
The memory /scan selector switch contains 7 memory switching positions and 1 scan switching position. The Lo terminal is 0 during “memory”, but changes to 1 during “scan” when the scan frequency is stored in the channel selector by the time constant circuit. The error detector circuit is activated whenever the code set by the memory DIP switch does not correspond to the code determined by the received frequency, resulting in the fluorescent E (Error) indicator lamp lighting up.
2. DIP Switch
By setting the DIP switch (tuned manually to light up the LED lamp) to the code determined by the received frequency, the frequency will be recalled from memory by pressing the switch.
3. Channel Selector Control
Scan pulse signals appear at the output whenever the UP or DOWN switches are pressed. Note, however, that the band edge detector is activated when either fmax (107.9 MHz) or fmin (88.1 MHz) is reached, thereby stopping the output scan pulse signals.
4. Channel Selector
The input code is passed straight through to the output during memory mode, but when the scan switch is on,
the code set by CON490 (fmin = 88.1 MHz) is stored in the memory. That is, the input signal appears at the output when Lo is 0. The code which has been stored in the memory by the scan pulse signal from the channel selector control then changes the received frequency by advancing or delaying, the counter. Frequency is changed by 50 kHz per scan pulse.
5. Code Converter
The channel selector output code is distributed io each frequency unit column (100MHz, 10MHz, 1MHz, and 100 kHz), and then converted into binary numbers corresponding to decimal numbers.