I have Gestetner DSM 730 and it give me an error of serial no: k8654300136, so the problem

SOURCE: Faxing with Gestetner DSm 635 sp Copier

There is a fax module that you can purchase to be able to fax from the copier. If it is already installed, you will see two phone jacks on the rear side of the machine. One will be labeled "Line" and one will be labeled "Tel" -- if you plug a phone cord from the jack in the wall to the jack labeled "Line," your copier is all ready to fax.

On the operation panel, there should be a button on the left labeled "Fax" under the buttons labeled "Copier" and "Document Server" -- press that button to get to the fax screen.

Hope that helps!

SOURCE: reset photoconductor unit gestetner dsm415

Zeroizing the counter Fotocondactor. The Sign - twinkle all lamps, in readiness not vyhodit.
1 To Press "copy" and include feeding with pressed кнопой. All indicators, except "Ready", light.
2 Release "Copy", press her(it) once again and keep until it is ed indicators "Toner" and "Paper" 10 sec
3 Release button. Switch off feeding, wait 15-20 sec, include once again

SOURCE: how to install gestetner DSM

open finsher and yo will find like knob pull it yo will find wth our languge lokcha this expression refer to stapler

SOURCE: my gestetner copier dsm 616 use to show sc 322

That code refers to a Laser problem.
It could be toner dirty and only need to vacuum it. But you have to know how to get in the Laser unit.
If you do not have that knowledge i advise you to call your technical support.

SOURCE: how do I make gray

Once in service mode (CLEAR MODES KEY, 107, HOLD CLEAR STOP KEY) enter sp 2902-003, enter test pattern#16 and press start. press copy window and select paper size, press start key twice to start test print. press sp mode to return to sp mode display. Hope this helps