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This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
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Ordered service manuel for a hard to find plasma tv - your company made it easy to find and purchase - I will use you again
Thanks for your help
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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.
RC-V7
CIRCUIT DESCRIPTION
Panel Section (LCD ASSY: B38-0772-65)
The panel section controls serial communications with the main unit control section, the key input circuit, the display circuit, and the dimmer circuit through the microprocessor (IC4).
� Display circuit
Display section is a 152x45-dot full-dot matrix LCD controlled by two LCD. As shown in Figure 1, the master IC (IC5) side is connected to 32 common dots and 80 segment dots and the slave IC (IC6) side is connected to 13 common dots and 72 segment dots. The LCD drive voltage is obtained by raising the power supply voltage (5V) within the IC. Also, the contrast level (LEBEL8) for resetting is adjusted with R19 to be optimum.
� Serial communications circuit
A buffer is inserted in order to protect the microprocessor ports.
� Key input circuit
There is one microprocessor port for each panel section key. The PSW key is pulled down and the other keys are pulled up with software within the microprocessor. The rotary encoder is input directly to the microprocessor.
32 COM
LCD 152 X 45(dot) 80 SEG LCD Driver IC 5 72 SEG LCD Driver IC 6 13 COM
Microprocessor IC4
Fig. 1 Display circuit
9V LED1 R57 LED2 LED3 LED4
� Dimmer circuit
The dimmer circuit switches the lamp brightness to one of four levels or OFF. (See Table 1.) The current flowing to the LEDs is varied by selecting resistors from R55 to R58. Dimmer level 1 2 3 4 OFF P60 H L L L L P61 L H L L L P62 L L H L L P63 L L L H L
P62 IC4 Microprocessor
R58
P60 Q13 P61 Q12
Table 1 Port logic
Q11 P63 Q10
Fig. 2 Dimmer circuit 2
R56
R55
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