Motorola ASTRO Digital XTL 5000 Detailed Service Manual

6881096C74-B May 25, 2005
Troubleshooting Charts: Flowcharts 5-55
5.6.41 No TX Audio (700–800 MHz)
Figure 5-43. No TX Audio (700–800 MHz)
MAEPF-27814-O
1.0Vpp
at R6782 or
VN_T67770?
No
Yes
0.4Vpp
at TP6755 or
C6783?
No
Yes
Check deviation
tuning or replace
U6751
GOTO
Controller
Section
Check
synthesizer
loop filter
components
NOTE: After the modulated signal is coupled
through C6783 the signal is attenuated to levels
below 2mv making a measurement difficult for
most oscilloscopes.
Inject a 2.0Vpp
1kHz tone into Mic
input and key radio
START
No TX Audio
This Flow chart only checks the modulation
path of the FGU. Readings are typical and
can vary with deviation settings that are
programmed during tuning.

Motorola ASTRO Digital XTL 5000 Specifications

General

Brand	Motorola
Model	ASTRO Digital XTL 5000
Category	Radio
Language	English