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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
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This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
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When I purchased this manual I had my doubts regarding the quality as the price was so reasonable as compared to other outlets.
The manual itself is of high standard the print is very clear as are the diagrams. Obviously with the diagrams one has to zoom in otherwise it is to small to be able to read.
Overall I am very pleased with the company who delivered as they said and with the manual they supplied.
I occasionally require a manual and now having registered with this company I shall order from them in the future.
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I was at first dubious about payiong for downloaded manuals but having done so, I was extremely impressed with quality of the two manual I ordered, well worth the small price I paid.
I would highly recommend these to my friends.
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reasonable price for the schematic - the service is perfect, all as expected and pointed by instructions - good scan of the original plans - thank you!
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3. Board detection
A
If the board connection from Main Ass�y to Amp&Primary Ass�y is interrupted, the BOARD_DET port becomes �H�. If the �H� is detected, the microprocessor will perform as following flow chart. In the case of simultaneous detection with the overload protection circuit, Board detection is performed preferentially to DC-abnormality detection and Overload detection. When an boad error is detected, A.MUTE* is turned on, speaker relay is turned off, then "BOAD ERR" flashes on the display. � The abnormality continues for 2 seconds. � Continues. The power is shut off. � Recovery The power is shut off even if the unit recovers.
B
4. Fan stop detection operation flow in the DC abnormality detection
C
If the fan is forcibly stopped, the 'DC PROT' port becomes "L". Then an abnormality of fan is detected. When an abnormality of fan is detected, A.MUTE* is turned on, speaker relay is turned off, the "AMP_ERR" flashes on the display. � The abnormality continues for 3 seconds. � Continues. � Recovery The program restarts.
*A.MUTE : Audio mute command
D
The power is shut off. � The power key is disabled.
However, when the following keys are pushed so that the key input of a line and the service can be carried out, power can be on. 1 TESTMODE ON (A55F+A55F) 2 When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec. (Effective, only when power-off is carried out by DC detection)
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VSX-815-K
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