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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!
CX-893
1.4 Mechanical control
1) Loading
The microprocessor instructs the motor driver IC651 to rotate backward (IC651: 3 pin: L, 4 pin:Ht¨L+: L, L-:H) if LOAD STRAT SW (SW652) detects OFF (LOAD STRAT=H). If LOAD STRAT SW (SW652) detects ON (LOAD END=L) later, the microprocessor instructs the motor driver IC651 to stop (IC651: 3pin: H, 4pin:Ht¨L+: L, L-:H) and completes the loading and then transits to PLAY operation. If DISC IN SW (SW903) is OFF (DISC IN=H) or LOAD END SW has been OFF for a long time, the microprocessor determines that there is no inserted disc or a disc insertion error and performs EJECT or Error STOP.
2) EJECT
The microprocessor instructs the motor driver IC651 to positively rotate (IC651: 3 pin: H, 4 pin:Lt¨L+: H, L-:L) when it receives the EJECT instruction. If EJECT END SW (SW653) detects ON (EJECT END=L) later, the microprocessor instructs the motor driver IC651 to stop (IC651: 3pin: H, 4pin:Ht¨L+: H, L-:H) and completes the EJECT operation.
1.5 Others
1) Temperature detection
This module detects high temperatures, to protect PU. When the temperature of the output from the temperature sensor (IC402) exceeds a certain voltage level, it is determined as high temperature and an appropriate process such as Error STOP will be performed. The ambient temperature which causes that high temperature on the module is approximately 80 degree Celsius.
2) Voltage monitoring
This module monitors voltage to protect the system. The signals which are resistive divided (R803, 804) from the input VD from the product (CN301: 1,2) are monitored (IC401, 25 pin). If the voltage of the signal is higher than 2.86 V (VD7V or higher) or lower than 2.04 V (VD5V or lower), an appropriate process such as Error STOP will be performed.
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