Ericsson A2618s Troubleshooting Manual page 16

If the KEY-led is not lit, measure the voltage on X850:3, 3.7 ± 0.50 V
If the voltage on X850:3 is 0 V there is a foil damage, send the unit on according to the local
company directives.
If the voltage on X850:3 is correct, measure that there is 0.75V ± 0.10 V
the illumination is activated, if not measure at R854 (1.0 kohm) 2.70V ± 0.10 V
measure at the side close to D600.
If the voltage at R854 is correct measure the resistance of R854 (1.0 kohm).
If it is incorrect, replace R854.
If the voltage at R854 is incorrect the fault probably is due to D600.
NOTE!
If everything is correct change the flex-film and the elastomer.
If the problem still remains, send the unit on according to the local company directives.
5.2.3 Green top indicator out of order
Open the unit and check for liquid damage.
No action should be taken for liquid damaged units, send the unit on according to the local
company directives.
Make sure that the flex-film and the elastomer are correctly mounted and mechanically intact.
Measure the voltage on X850: 14, 2.7 ± 0.10 V
Measure the voltage on X850: 13, 2.7 ± 0.10 V
If the voltage is incorrect, measure at R860 2.70V ± 0.10 V
If the voltage at R860 is correct. measure the resistance of R860 (150 ohms).
If it is incorrect, replace R860.
If the voltage at R860 is incorrect the fault probably is due to D600.
NOTE!
If everything is correct change the flex-film and the elastomer.
If the fault still remains, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/25 A
Since the LEDs only are lit for ~10sec.
You will need to activate a key before measuring.
The signal is low when activated.
Trouble Shooting Guide, Standard
DC
(VDIG) Fig .5.1.
DC
(TOPLED). Fig .5.1.
DC
, at the side close to D600.
DC
(VBATT) Fig .5.1.
on V854: 1,when
DC
,
DC
16(24)