uniphy PHYACTION 190, Информация о сервисе

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6. EXCHANGING BOARDS AND MODULES Service information Phyaction 190 / 190i - Page 18
The three screws with the mounting material can now be placed. These screws are thread-forming screws. The
best way to screw them in is as follows. You put the screw in the hole and first turn it anti-clockwise with a
screwdriver. If you feel that the screw is falling into the thread, you screw it in (clockwise). In this way you
prevent that a second thread is formed. This second thread wouldn't be very strong and there is even a
possibility the screw won't hold at all. This would mean you would have to exchange the front panel, which is at
lot of work and a lot of money. Do not forget to fix the tab at R82/C82, ESD performance would be severely
impaired. Finally you can put in the safety socket, fix it and connect the cable.
After this you install the bottom plate and do a functional test and a safety test.
5.4 Exchanging the LCD
If you have to exchange the LCD, you first have to remove the main PCB as decribed in section 5.2 Exchanging
the software or the main board (PCB 192X) . Then you remove the flexcable on the keyboard PCB. After that
you can unscrew the four screws in the corners of the LCD module. Now you can take the LCD module out of
the appliance.
If you put in a new LCD module, make sure the LCD glass and the inside of the glass that is glued in the front
panel are clean. You can put in the new module and fix it with the four screws. These screws are thread-
forming screws. The best way to screw them in is as follows. You put the screw in the hole and first turn it anti-
clockwise with a screwdriver. If you feel the screw is falling into the thread, you screw it in (clockwise). In this
way you prevent that a second thread is formed. This second thread wouldn't be very strong and there is even
a possibility the screw won't hold at all. This would mean you would have to exchange the front panel, which is
at lot of work and a lot of money. Finally connect the cable on the keyboard panel and re-install the main board.
After this you install the bottom plate and do a functional test and a safety test.
5.5 Exchanging the keyboard PCB (194X)
If you want to exchange the keyboard PCB you will have to remove the bottom plate as described in section 5.1
Introduction . Remove the flexcable from the LCD and the cable that is coming from the main board. Now you
can remove the five screws and exchange the board.
Between the keyboard PCB and the key knobs is a silicon foil, to prevent any water to reach the electronic
circuits or the mains transformer. If there are any holes in the foil, you should exchange that as well.
You can fix the new keyboard PCB with the five screws. These screws are thread-forming screws. The best
way to screw them in is as follows. You put the screw in the hole and first turn it anti-clockwise with a
screwdriver. If you feel that the screw is falling into the thread, you screw it in (clockwise). In this way you
prevent that a second thread is formed. This second thread wouldn't be very strong and there is even a
possibility that the screw won't hold at all. This would mean you would have to exchange the front panel, which
is at lot of work and a lot of money. Finally you connect the two cables and install the bottom plate and do a
functional test and a safety test.
If you switch on the appliance with a new keyboard it may take some time before you get information on the
screen. This is because the E²PROM memory on the keyboard has to be initialised. This is also the reason why
you will get an error message (Error 32, E²PROM completely blank). Wait for the error message and switch the
appliance off and on again. Because the memory is on this PCB, you have to realise the patient memory and all
data of the treatment heads are erased. This means you have to reinstall the treatment heads (see Appendix
2).