Motorola MCS 2000 Service Instructions Manual page 147

Troubleshooting Troubleshooting Chart 1-13 (1 of 2), Power Control
Troubleshooting Chart 1-13 (1 of 2), Power Control
See Band Specific
START
TX Troubleshooting
Chart for proper setup
Check Port K1
(pin H9) of U0104
Check
U0103
Check
U0103
68P81083C20-D
Using RSS, check
personality for the
channel of interest
Using RSS, set current limit
values to zero and program
into radio (F8). Go into
Transmitter Power Tuning Screen.
During TX
Is
No No
k9.1_ENB
~5V?
Yes
Check Q0553,
Q0552, R0586,
R0585 or (R0528)
SPI_CLK
No
No
on pin 67 or
U0103?
Yes
Check
R0404
No
Check
pin K7 of U0104
SPI_DATA
No No
on pin 66 of
U0103?
Yes
Check
R0403
Set to
Yes
Is it set to
High Power
Low Power?
and retest
No
Set to values
Tuning
No
within range
values per
specified in Table 1
Table 1?
and retest
Yes
k9.1
~9V?
Yes
Is
PA_PWR_SET
Yes PA_CNTL
(U0551 pin 2)
(TP0400)
voltage per
<1.0V?
Table 2?
No
SPI_CLK
Q0551
at U0551 pin 10
OK?
during tuning?
Yes
Is
U0550 pin 10
<4.0V?
DA_SEL
Is
(U0551 pin 6) goes
U0550 pin 9
low during
>5.0V?
tuning?
Yes
V_FORWARD
SPI_DATA
(U0550 pin 12)
at U0551 pin 1
>max band specific
during tuning?
values in Table
3?
Yes
Check U0550, R0571,
Check
C0569, CR0551, CR0550,
U0551
C0553, C0554, R0570,
R0554, R0564, R0573
Is
No
1
To Sheet 2
Yes
Repair
No
or replace
Q0551
Yes
Check R0567,
Yes
R0569, and
C0562
No
Check U0550, R0570,
No
C0568, CR0550, C0554,
C0553, CR0551, C0555
Yes
Is
GOTO
Yes
Band Specific
TX Troubleshooting
Chart
No
December 6, 2004
9-31