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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.
;
reasonable price for the schematic - the service is perfect, all as expected and pointed by instructions - good scan of the original plans - thank you!
PIN No.
SYMBOL
PIN NAME
DESCRIPTION Device ground pins. Remarks: Pins 26 and 58 are connected inside the chips, and therefore it is not necessary to use both pins for GND: One of them is used for GND. Beep output pin when momentary key pressed. A 2.25 kHz and 50% duty square wave is output for approx. 40 ms. This time is equal to the premuting time. When a momentary key is pressed and the state of the LCD panel display or output port is changed (valid key) and at the end of 5 seconds hold during preset memory scan and scan operations, a beep is output. To disable the beep, float (leave open) this pin. The beep output is also used at SK alarm at DK standby.
OUTPUT TYPE
26 GND 58 Ground
�
27
BEEP
Beep output
CMOS push-pull
28 to 39 40 to 55
LCD27 to LCD16
LCD15/KS15 to LCD0/KS0
LCD panel segment signal output (pins 28 to 55) and key matrix key source signal output (pins 40 to 55) pins. 56-dot display is performed at the LCD panel by matrix with LCD segment the COM1 pin (pin 56) and COM2 pin (pin 57). and Since LCD15/KS15 (pin 40) to LCD0/KS0 (pin 55) share the key key source source signal and LCD segment signal, to use them as key output source signals, a reverse current prevention diode is necessary. For the connection method, see 1.3 �Key Matrix Connection� and 6 �Application Circuits�. Common signal output to LCD panel. 56-dot display is performed at the LCD panel by matrix with LCD27 (pin 18) to LCD0/KS0 (pin 55).
CMOS push-pull
56 57
COM1 COM2
LCD common signal output
CMOS push-pull
59 to 62
K3 to K0
Key return signal input
Key matrix key return signal input pin. Since the key source signal output is shared with the LCD segment signal, do not connect a pull-down resistor to this pin.
Input
16
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