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Very usefull manual. From my point of view there are needs more clearables images.
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Once again owner-manual.com has saved the day for me, and come through with the manual I need. I looked other places too, and couldn't find it anywhere. Thank You owner-manual.com!!! You're the BEST!
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very good quality that can be magnified several times, and it remains readable.
For sure I will return next time the need for a service manual arise.
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The service manual is really great - thanks to it I was able to install the laser unit and thus "save" my CD-player, which seemed to be impossible before I had the manual.
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Downloaded the Service manual OK of the Technics Piano and have now repaired it and its going fine. Excellant; thank you for the fine servce. A.M
TX-DS494/HT-R490 CONFIRMATION
CONFIRMATION OF PROTECTION CIRCUIT
1. Confirmation of speaker relay
Confirm that the speaker relay turns ON approximate 5 seconds after the power switch is turned ON. Confirm that the speaker relay turns OFF immediately after the power switch is turned OFF.
2. Confirmation of DC detection circuit
1. Press and hold down CD button, then press SPEAKERS A and SPEAKERS B buttons at the same time. 2. Press DVD button, while "TEST-1_" on the FLtube is displayed. During "TEST-1-00" on the FL tube is displayed. 3. Press SPEAKERS A button button During "TEST-1-01" on the FL tube is displayed. 4. Apply DC 1.5 3V to MULTI CHANNEL INPUT terminals with no load. Confirm that the speaker relay turns OFF. 5. Apply DC -1.5 3V to MULTI CHANNEL INPUT terminals with no load. Confirm that the speaker relay turns OFF.
3. Confirmation of Current detection circuit
1. Press and hold down CD button, then press SPEAKERS A and SPEAKERS B buttons at the same time. 2. Press DVD button, while "TEST-1_" on the FLtube is displayed. During "TEST-1-00" on the FL tube is displayed. 3. Press SPEAKERS A button button During "TEST-1-01" on the FL tube is displayed. 4. Connect Differentiator below and apply the 50Hz square signal to the MULTI CHANNEL INPUT terminals. 5. Adjust the attenuator or Volume so that the output level becomes 35V p-p. 6. Confirm that the speaker relay does not turn OFF when a 3.0 ohm load is connected. 7. Confirm that the speaker relay turns OFF when a 1.0 ohm load is connected.
AF Oscillator Differentiator 50Hz Square wave Oscilloscope 3.3k Input 10k GND 0.1 F 1SS133 3.3k Output 0.01 F GND 35Vp-p Attenuator CD Terminal Unit Speaker terminal Load
Differentiator
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