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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!
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[2] POWER SUPPLY UNIT
Flowchart of Failure Analysis for The POWER SUPPLY Unit
Failure analysis for the POWER SUPPLY Unit => PP1 STB 3.4 V power is not output.
Is the cable connected firmly to the P7 connector? Yes
B
No
Properly connect the cable between the P7 and M2 connectors.
Is the cable to the P7 connector broken? No Is the fuse (F001) blown? No Is one of the limiting resistor (FR002) blown? No The POWER SUPPLY Unit is normal.
Yes Replace the defective cable (J109).
Check the voltage at the MAIN Assy and POWER SUPPLY Unit.
Yes Replace the POWER SUPPLY Unit.
Yes Replace the POWER SUPPLY Unit.
Check the resistance between D025 cathode and C101 (+), using a tester.
C
Failure analysis for the POWER SUPPLY Unit => PP2
The power is not on, even though the RELAY port is active.
No Is the relay (RY002) on? Yes No Is the PFC voltage normal? Yes
D
Replace the POWER SUPPLY Unit.
� Check the relay operation at the RY002. (Voltage: 3.4 V) � Check the relay sound (click).
Replace the POWER SUPPLY Unit.
� Check the voltage between the C017 (-) and C017 (+). � The voltage must be around 400 V. (340V or less are defective.) Caution: High voltage!
The POWER SUPPLY Unit is normal.
Failure analysis for the POWER SUPPLY Unit => PP3
The cells of the panel do not light normally.
Is the VADR voltage within the specified values? Yes
E
No
Replace the POWER SUPPLY Unit.
The specified voltage values are between 72 and 78 V.
Is there a fluctuation in the VADR voltage? No Is the VSUS voltage within the specified range? Yes Is there a fluctuation in the VSUS voltage? No The POWER SUPPLY Unit is normal.
Yes
Replace the POWER SUPPLY Unit.
The ripple must be within 5 V.
No
Replace the POWER SUPPLY Unit.
The specified voltage values are between 200 and 210 V (VSU: 125/35°C).
Yes Replace the POWER SUPPLY Unit.
The ripple must be within 10 V.
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KRP-500P
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