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very helpful, I could not have cleaned motherboard and replaced the main fan without it
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Good manual, schematics nice and clear with good quality scanning. Woul dhave been nice to have immediate access after purchasing though.
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I was very glad recieving the service manal from You. Manuals were delivered promptly and were correct as advertised. A complete and very usefull service manual with all details. Thank you!
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Very clear copy. No pages missing. Big bonus is that it includes supplement. Price is affordable compared to what others ask for.
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Found the quality of the copy excellent and a very quick service. I would certainly recommend the service.
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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