Motorola i897 - DC Distribution (SW2) Test

TROUBLESHOOTING: DC Distribution (SW2) Test
3.20 DC Distribution (SW2) Test
Use this test on a unit with the following symptom: no SW2 (1.875 Vdc).
Check C705 & C707 for 1.875
Vdc.
Check FILT_B+
(3.6 Vdc) at
C704 or C706
Is 1.875 Vdc
present at
the parts ?
No
Yes
Check for US, DFP, etc.
Repair as necessary.
Is 3.6 Vdc
present ?
Yes
Go to FILT_B+
flowchart.
No
Goto DC Distribution
(SW1) flow chart to
check on SW1
circuitry
Is 1.25V Vdc
present?
Check SW1 1.25V at
C715
Yes
Replace U701
Regulator
No
102
6880401P59-O