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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!
Horizontal and Vertical Synchronisation Connections
Pin 20 is the vertical synchronisation input from the deflection stage. This input is used for OSD vertical synchronisation. When the TV is in the standby state, this input is normally low. The vertical input is triggered on the rising edge (positive polarity). A failure of the signal at this input when the TV is powered up will cause the TV to go to standby and fault code 0004 to be set. Pin 19 is the horizontal synchronisation input from the deflection stage. This input is used for OSD horizontal synchronisation. When the TV is in the standby state, this input is normally low. The horizontal input is triggered on the rising edge (positive polarity). A failure of the signal at this input when the TV is powered up will cause the TV to go to standby and fault code 0003 to be set.
General Input Connections Headphone Input
Pin 26 is used to detect if the headphone has been inserted into its socket. This input is normally high unless the headphone has been inserted; in which case it is near 0V. When the headphone is inserted, the loudspeakers (and internal sub-woofer if available) in the television are automatically muted.
Protection Input
Pin 21 is used to determine if a protection fault has occurred on the chassis. This line is connected to various sensing points in the power supply and deflection stages. This line is normally high unless a fault has occurred; in which case it is near ground potential.
Power-Good Input
Pin 23 is used to indicate if the power has been removed from the TV. This input normally has a mains frequency square wave, which is monitored by the software in the microcontroller. If a failure of this signal occurs when the TV is powered up, the audio power amplifiers are muted and the television begins to power-down into standby. If a brief interruption of the mains supply occurs, the TV will enter the standby condition temporarily before powering back up a few seconds later.
DTT Fan Fail Input
Pin 25 is used only on an IDTV model fitted with a DTT module. It is used to indicate if a fault in the fan on the DTT unit has occurred. This input is normally HIGH unless a fault condition has been detected (0V).
Front Panel Buttons and SAV3 Socket Inputs
Pins 15 and 16 are 2 of the 4 ADC inputs of the microcontroller. Pin 16 is connected to the Volume +/- buttons and the SAV3 (Hi-8) socket on the front panel of the TV. When the voltage on this pin is changed to a value in a certain window, the microcontroller will interpret it as either a volume up, volume down and/or an SVHS Hi-8 connector was inserted into the Hi-8 socket. Pin 15 is connected to the Programme +/- and Menu buttons on the front panel of the TV. When the voltage on this pin is changed to a value in a certain window, the microcontroller will interpret it as either a programme change or the menu button was pressed.
Analog Inputs
Pin 17 (ADC2) is the analogue input shared between the tuner AGC feedback voltage input and the scart 4 pin 8 voltage input. The selection of input is made by I304 controlled by the ADC_SEL pin (I003 pin 2). Pin 18 (ADC3) is the analogue input shared between the tuner scart 1 pin 8 voltage input and the scart 2 pin 8 voltage input. The selection of input is made by I304 controlled by the ADC_SEL pin (I003 pin 2).
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