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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!
MDR-NC50
SERVICE MANUAL
Ver. 1.2 2005.02
US Model Canadian Model AEP Model UK Model E Model Tourist Model
SPECIFICATIONS
General Type Driver units Power handling capacity Impedance
Dynamic, closed 40 mm, dome type 100 mW 40 � at 1 kHz (when the power is on) 100 � at 1 kHz (when the power is off) Sensitivity 102 dB/mW (when the power is on) 100 dB/mW (when the power is off) Frequency response 14 � 22,000 Hz Frequency range of active noise attenuation 40 � 1,500 Hz, more than 14 dB at 300 Hz Power source DC 1.5 V, 1 � R03 (size AAA) battery Mass Approx. 290 g (11 oz) including battery
UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK Unleaded solder has the following characteristics. � Unleaded solder melts at a temperature about 40 �C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 �C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! � Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. � Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.
Battery life
Battery Sony alkaline LR03/AM-4 (N) (size AAA) battery Sony manganese R03/ UM-4 (NU) (size AAA) battery Approx. hours*1 30 hours*2 15 hours*2
*1 1 kHz, 1 mW + 1 mW input *2 Time stated above may vary, depending on the temperature or conditions of use.
When to replace the battery
Replace the battery with a new one when the POWER indicator dims. The noise canceling feature may not work correctly if battery power is low.
Supplied accessories Connecting cord (0.5 m, gold-plated stereo mini plug (1) (Tourist only),
1.5 m, gold plated L type stereo mini plug (1)), R03 (size AAA) dry battery (1) (Tourist only), Carrying case (1), Plug adaptor for in-flight
Note on chip component replacement
� Never reuse a disconnected chip componet � Notice that the minus side of a teamtalum capacitor may be damaged by heat
use* (single/dual) (1), Gold-plated unimatch plug adaptor (stereo phone plug y stereo mini jack) (1), Operating Instructions (1) * May not be compatible with some in-flight music services. Design and specifications are subject to change without notice.
NOISE CANCELING HEADPHONES
9-879-314-03
2005B05-1 © 2005.02
Sony Corporation
Personal Audio Group Published by Sony Engineering Corporation
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