Chart 33. 800 Mhz Dc Switch; Chart 34. Vhf/Uhf Dc Switch - Motorola ASTRO XTS 3000 Service Manual

800MHz DC Switch.
Yes
Voltage at
Q503-4?
No
0V at Q503
Yes
Voltage at
Pin 5 - RX
U305-1?
Pin 3 - TX?
Yes No
Check U503.
Yes
VDC at U305?
No
VDC at J1-17?
Yes
Refer to Chart
C.5 on "DC
Supply Problem".
Check
continuity
between U305
and Q503.
Replace U305.
Check mating
No
plug. If plug is
good, go to
chart C.26.
MAEPF-24392-O

Chart 33. 800 MHz DC Switch

No R5
U106 Pin 2
Voltage
YES
at U106
Pin 8?
NO
Less
YES
Replace than 4.8V
at U106
U106
Pin 3?
NO Check L131,
Voltage YES
L121 and CR109
at Q107,
and L122 For
Pin 2?
Open Connections
YES 5V at NO
Replace
U102
U102
Pin 1?
Check DC Power
Voltage
NO
Supply Failure
at Q107,
Chart C.5
NO
Pin 3?
YES
YES 7.5V at
Replace
U202
U202
Pin 8?
NO Voltage
YES
Replace
at Q107,
Q107
Pin 4?
NO
No T5
Voltage
YES
at Q111 Pin
3 collector?
Less than
YES
Replace
4.8V at Q111
Q111
Pin 1 base?
YES
Voltage
Replace
at U202,
U202
NO
Pin 8?
Replace
U102
YES 5V at
U102
YES
Pin 1?
Check Fuse,
5V at
NO Flex Connection
Pin 3
J1-15, 18, 20;
of U102?
Volume Switch
NO
Voltage
NO
at U202
Pin 8?
Check
conn. J1,
NO
YES
R101, and
connector
good?
Replace U202
YES
Rectify
Go to
Fault
Chart C.24
MAEPF-26044-O
NO
NO

Chart 34. VHF/UHF DC Switch

10-33