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ONKYO HTR420
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of ONKYO HTR420 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 47 (click to view)
TX-SR402/8240/HT-R420 OPERATION CHECK-1
DC VOLTAGE DETECTION PROTECTORS
[NOTE1] Limit time to apply voltage is 0.5 - 1.0 seconds each channel. When protection operation does not occur at once, try several times. [NOTE2] Don't connect speakers or any load. Don't short speaker terminals. 1. Set the unit to test mode " Test-1-00 " . 1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.

Te st - _
1-2. Press the DVD button, while the display of "Test - _" has come out. Unit will be in the state of " Test-1-00 ".

Te st - 1-00
2. Apply DC voltage (+1.5 to +3V) to MULTI CHANNEL (FL, FR, SL, SR, C, SW) terminal, each channel. 3. Check that "protect" is display come out. 4. Apply DC voltage (-1.5 to -3V) to MULTI CHANNEL (FL, FR, SL, SR, C, SW) terminal, each channel. 5. Check that "protect" is display come out. 6. Press the STANDBY/ON button.
Disappears

Clear

CURRENT DETECTION PROTECTORS
[NOTE] In the state of testmode"Test-4-29", the pulse waveform for checking from speaker terminal outputs automatically. Therefore, oscllator is unnecessary. 1. Set the unit to test mode "Test-4-29" 1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.

Te st - _
1-2. Press the VIDEO3 button, while the display of "Test - _" has come out. Unit will be in the state of "Test-4-00".

Te st - 4- 00
1-3. Repeat and press SPEAKERS B until the display of "Test-4-29" comes out.

Te st - 4-29
2. Connect the lord resister (3ohms) to the speaker terminals. 3. Check the not displayed "PROTECT" and speaker relays not turn OFF. 4. Check the each speaker terminals. 5. Connect the lord resister (1.5ohms) to the speaker terminals. 6. Check the displayed "PROTECT" and speaker relays turn OFF immediately. 7. Check the each speaker terminals. 6. Press the STANDBY/ON button. Disappears

C lear

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