Ericsson I 888 Trouble-Shooting Instruction page 28

R680
R686
D602
C626
R618
C625
C627
C630
C628
R600
C629
R627
Measure the resistance of R600 - 33 Ohm, R617 - 15 kOhm, R627 - 33 Ohm, R628
- 33 Ohm, R680 - 15 kOhm and R684 - 33 Ohm. If any resistor are incorrect,
replace it, all are class A, fig 7.2.
Give the board power and start it up. Measure the voltage on D602:1 (3.2 V, class A,
fig 7.2). If the voltage is lower, measure the resistance of R686 (4,7 kOhm, class A,
fig 7.2). If the resistance ic correct, then VDIG is incorrect and you have to proceed
to section 3: "Doesn´t start"-fault. Measure the voltages on D602:12 - 0 V and
D602:13 - 3,2 V. If any of the voltages are incorrect, replace C638 (class A, fig 7.2).
If that didn´t make it, replace D602 (class A, fig 7.2).
If all values are correct, replace D600 (class B, fig 7.2). If that didn´t make it,
replace D602 (class A, fig 7.2).
If the fault still remains, send the phone to the next repair level.
4-00021-2/FEA 209 544/5.C
I888, Standard Electrical Repairs
D600
R684
32
33
7 1
64
8 14
65
96
R617 R628
C638
Fig. 7.2
1
128
97
28
(42)