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RICOH AFICIO 350
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of RICOH AFICIO 350 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 64 (click to view)
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 â 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 âKâ, âtoner supply rateâ 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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