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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!
DEVELOPMENT
26 March 1998
Toner supply motor on time calculation
The toner supply motor on time is decided using the following formula:
L 0.7mg/cm 2 x Image Pixel Count x Gain (Vt - Vtref) x 10,000 O M P M Toner Supply Rate x K + P ............(1) N Toner Supply Rate x K Q L M (255 - Image Pixel Count) x Gain P O ......................................................(2) x N 255 6Q
NOTE: 1) The toner supply rate can be changed using SP2-209. 2) K = Toner supply rate coefficient (0.25 ~ 3.0: default = 3.0). 3) The bracket (2) in the above formula is only used if Vtref < Vt. 4) The maximum toner supply motor on time is 1.2 s.
Vsp and Vsg detection
The ID sensor (at the lower right area of the drum) detects the following voltages. � Vsg: The ID sensor output when checking the drum surface. � Vsp: The ID sensor output when checking the ID sensor pattern. In this way, the reflectivity of both the drum surface and the pattern on the drum are checked. This compensates for any variations in the reflectivity of the pattern on the drum or the reflectivity of the drum surface. The ID sensor pattern is made on the drum by the charge roller and laser diodes. Vsg/Vsp is detected every 10 copies to decide the new Vtref. The Vsg/Vsp detection period can be changed using SP2-210 (the default is 10).
New Vtref determination
Even if the toner concentration in the developer is kept constant by checking the TD sensor, the toner potential (chargeability) and the image density both change with humidity and the amount of toner on the carrier. Therefore, the actual image density, using the ID sensor output, is also used as one of the factors for deciding the new Vtref which is used for toner density control. The new Vtref is determined using the following data. � Vtref � Vt(10) � Vsp/Vsg From this point, toner density control is done using the new Vtref.
Image Pixel Count Control Mode.
This mode should only be used as a temporary measure while waiting for replacement parts, such as a TD sensor. This mode controls the toner supply amount using the same formula for the toner bottle motor on time. However, the GAIN value is fixed at 1, and the other coefficients, such as �K�, �toner supply rate� keep the values that they had when the toner density control mode was changed over to image pixel count mode.
2-42
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