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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!
SM-SX1H
TROUBLESHOOTING
� Power is not supplied. Does AC100V stand between Pins 1 and 2 of the power filter PWB connector CNP502? Yes Is any normal voltage is output from the power PWB B1503/CNS503? Yes No � Check the output voltage (OYT terminal) of UNT501 and UNT502. � Check the parts (L504 to L511, F502, FS503 and R503 to R506) on the power PWB. � Check the 1-bit amplification unit. (Try to disconnect CNWAM4 and CNWAM3.) (LED does not come on and it does not sound.) � Check the fuse F501. � Check the parts on the power filter PWB. � Check the wiring of the inlets SOC501 and CNS501.
No
Is 5V supplied to Pin 13 of the microcomputer IC907? Yes Is any oscillating waveform found at Pins 14 (OSC2) and 15 (OSC1)? No
� Check IC306 output. � Check R391.
No
� Check X900. � Check IC907.
� It neither sound at the analog nor digital input. Are the speaker relays RLY201 and RLY202 switched? Yes Are they properly wired to the 1-bit amplifying unit? (CNWAM1, CNWAM2, CNWAM3, CNWAM4)
(when power is supplied and LED is lit.) � Check whether 12V is supplied to RLY201 and RLY202 or not. (Check the surroundings of Q201, Q202, R201 to R202.) � Check whether Q203 and Q204 are on or not. � Check the line Q203 and Q204 from Pin 41 of the microcomputer IC907.
No
Is voltage properly supplied to 1-bit amplifier? (CNP306)
No
� Check whether the proper voltage is output from the AC input filter CNP502 or not. � Check whether RLY303 is activated or not. � Check whether Q303 is on or not. � Check the line Q303 from Pin 42 of the microcomputer IC907. � Check -22V (around Q115 and Q114). � Check 5V (around Q105 and Q106). � Check reset 5V. (Connection from Pin 21 of the microcomputer IC904.) � Check CNS601A/B and main volume, VOL601. � Check the IC107 output voltage which is supplied to drive the relay. � Check the relays RLY601 and RLY602 and drive circuit.
Yes
Is voltage properly supplied to 1-bit amplifier? (CNP305) No Yes
Is any signal output from the connectors CNP303 and CNP304 for 1-bit amplifier? Yes
No
Check the inside of the 1-bit amplifying unit.
� 34 �
 $4.99 SMSX1H SHARP
Owner's Manual Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
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