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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!
CD SECTION
Note: 1. CD Block basically constructed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use the oscilloscope with more than 10 M� impedance. 4. Clean an objective lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. Focus Bias Adjustment Setting: This adjustment is performed with the set placed horizontally.
oscilloscope SERVO board TP (RF) TP (RF. GND)
+ �
Focus Gain Adjustment (Coarse adjustment) This adjustment is not required unless the following parts are replaced: � Optical pick-up � RV4 Procedure: 1. Set RV4 to the standard position. (mechanical center) 2. Check whether operation noise (while noise type) caused by the 2-axis device (lens section of the optical pick-up) is abnormally loud. If the operation noise is too loud, turn RV4 slightly counterclockwise. � If the gain is too low: Focus does not function and no music is selected. � If the gain is too high: Noise caused by scratches and dust is heard and the operation becomes unstable. Adjustment Location: servo board Adjustment Location: servo board (component side)
Procedure: 1. Connect an oscilloscope between TP (RF) and TP (RF. GND) on the SERVO board. 2. Connect the power supply. 3. Push the RESET button (S900) on the MAIN board. 4. Insert the disc (YEDS-18) and playback. 5. Adjust RV1 so that the oscilloscope waveform is clear and check RF signal level is correct or not. Note: Clear RF signal waveform means that the sharp �� � can be clearly distinguished at the center of the waveform.
RF signal waveform VOLT/DIV: 200 mV TIME/DIV: 500 nS
IC3 CN2
FOCUS GAIN ADJ RV4
IC1 CN1 IC2
TP (RF. GND)
level: 1.0 � 1.5 Vp-p
� When observing the eye pattern, set the oscilloscope to AC range and raise the vertical sensitivity so that it may be easily seen. Adjustment Location: servo board
TP (RF) CN3
RV1 FOCUS BIAS ADJ
� 18 �
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