Ericsson I 888 Trouble-Shooting Instruction page 31

Row 1 D600:125
Row 2 D600:124
Row 3 D600:123
Row 4 D600:122
Row 5 D600:120
column 1 D600:126
column 2 D600:127
column 3 D600:1
column 4 D600:128
Make sure there is a voltage (3.2 V) on the faulty keyboard pads according to Fig
8.4 below. Note! The No button has 4.8 V and the flip button looks different.
Flip-button (measure the voltage on the left part).
If the voltage is missing on a complete row, measure the voltage on the correspond-
ing pin at D600 (Fig 8.3). If the voltage is correct on the pin there is a foil damage
and the board has to be discarded. If the voltage is missing on the pin to, replace
D600 (class B).
4-00021-2/FEA 209 544/5.C
2
3
1
6
4 5
8 9
7
* 0
#
>
Yes
<
Fig 8.3
No button
Fig 8.4
I888, Standard Electrical Repairs
Flip
X820
Clr
VBATT
NO
To column
Measure the voltage on the
"E"-shaped pad.
3
2
1
ONSRQ
31
(42)