Troubleshooting Chart 1-13 (2 Of 2), Power Control - Motorola MCS 2000 Service Instructions Manual

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Troubleshooting Chart 1-13 (2 of 2), Power Control

Is
PA_CNTL (TP0400)
1
<max band specific
values in
From Sheet 1 Table 3?
No
GOTO Band Specific
TX Troubleshooting
Chart
December 6, 2004
Troubleshooting Troubleshooting Chart 1-13 (2 of 2), Power Control
Are
Q0554, R0563,
Yes
No
R0573, C0566, R0564,
R0554, R0553, R0577,
and R0581
OK?
Yes
Is
Yes
U0550 pin 1
>4.0V?
No
Is
No
U0550 pin 7
>4.0V?
Yes
Is
CUR_LIM_SET No
(U0551 pin 4)
>7.0V?
Yes
SPI_CLK
No
at U0551 pin 10
during tuning?
Yes
DA_SEL
No
(U0551 pin 6) goes
low during
tuning?
Yes
SPI_DATA
No
at U0551 pin 1
during tuning?
Yes
Check
U0551
Repair or
replace defective
component
U0550 pin 3
near 4.65V?
Check
GOTO Band Specific
R0576, R0582,
TX Troubleshooting
C0551 and 9.3V
Chart
Supply
Check U0550, R0546, R0547,
R0548, R0549, R0557, R0558,
R0559, R0560, R0580, R0583,
R0589, R0598, and C0557
SPI_CLK
Check
No
on pin 67 or
U0103
U0103?
Yes
Check
R0404
Check
pin K7 of U0104
SPI_DATA
Check
No
on pin 66 of
U0103
U0103?
Yes
Check
R0403
Check R0587, R0550,
Is
C0551, R0551, U0550,
Yes
C0231, RT5610,
CR0550, CR0551,
C0555, C0553, C0554
No
MAEPF-25967-O
68P81083C20-D