Keyboard - Ericsson PF 768 Troubleshooting Instructions

PF768, Standard Electrical Repairs

7 Keyboard

7.1 Kind of keyboard fault.
Insert a SIM card and a fully charged battery into the phone. Start the phone by
pressing the On/Off key.
• If it doesn't start at all, proceed to chapter 3 ("Doesn´tstart"-fault).
Press all the keys (including the volume keys at the side) and verify which are func-
tional. Verification is most easily done like this:
1. Go to "key sound" in the menu. Choose "click".
2. Press the 1, 2, 3...*, 0, # keys. A clicking sound should be heard at every key
3. Press the "Yes", "No", "clr", "<" and ">" keys. When pressing "Yes" the phone
4. Press the volume keys on the side of the phone. A clicking sound should be
• If only the volume keys aren't functional, proceed to section 7.2.
• If one or more keys of the keyboard aren't functional, proceed to section 7.3.
• If one or both of the volume keys and one or more keys of the keyboard aren't
7.2 Volume keys aren't functional.
Open the phone and check for liquid damages, especially around the S820 and S821
switches (fig. 7.1).
pressed and the corresponding symbol should appear in the display.
should attempt to place a call and when pressing "No" it should terminate it. The
"clr" key erases the symbols in the display one by one and the "<" and ">" keys
make you skim through the menu.
heard for every press of the keys.
functional, proceed to section 7.2 and then to section 7.3.
4/00021-2/FEA 209 544/11.C
Fig. 7.1
37
(68)