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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
 ;
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!
QT-CD210H/W
� Laser failure.
Is +5V applied to the emiter of Q204 ? No Yes Check the PWB pattern of Q204.
Is +5V applied to the collector of Q204 ? Yes
No
Check the peripheral parts of IC803 and Q204.
Is +5V applied to the pin 75 (VDD) of IC802 ? No Yes Is +5V applied to the pin 1 (VCC) of IC801 ? No Yes
Check the PWB pattern between collector of Q204 and pin 75 of IC802.
Check the PWB pattern between collector of Q204 and pin 1 of IC801.
Is +0V applied to the pin 74 (SEL) of IC802 ? Yes
No
Check the laser come on when pattern cut between pin 8 (SEL) of IC801 and pin 74 (SEL) of IC802.
Is approx. 1.8V applied to the collector of Q801. Yes Check BI801/CNS801. If it is normal, the optical pickup is faulty.
No
Check the peripheral parts of IC801 and Q801. If it is normal, the optical pickup is faulty.
� Focus failure.
Does the optical pickup move up and down when the disc is removed? Yes Is the following waveform ouput at the pin 62 (FEI) of IC802 when the disc is set? Yes
pin 62 (FEI)
No
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE FAILURE".
Check the periphery of IC801 and BI801/CNS801. Is it normal? No Yes The optical pickup is faulty.
pin 86 (FOO)
pin 63 (SBAD)
Is the waveform shown above input at the pin 63 (SBAD) of IC802? Yes IC801 is faulty.
No
Check the pattern between pin 13 of IC801 and pin 63 of IC802. Check the periphery of IC801 and BI801/CNS801.
� 19 �
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