Motorola Professional GP640 Informazioni sul servizio - Pagina 26

Sfoglia online o scarica il pdf Informazioni sul servizio per Radio Motorola Professional GP640. Motorola Professional GP640 32. Professional radio, power distribution and controller
Anche per Motorola Professional GP640: Manuale d'uso (32 pagine), Scheda tecnica (2 pagine), Informazioni sul servizio (28 pagine), Informazioni sul servizio (30 pagine), Informazioni sul servizio (26 pagine), Informazioni sul servizio (43 pagine), Informazioni sul servizio (30 pagine)

Stampa la pagina
Motorola Professional GP640 Informazioni sul servizio
3-4
4.0

Troubleshooting Flow Chart for Synthesizer

Check CR201,
U210, U211,
Correct
C258, C259 &
Problem
C228
YES
NO
5V
Is U201
at pin 6 of
Pin47 AT =
CR201
13VDC
NO
YES
Check
L202
Is
U241 Pin 19
<0.7 VDC in RX &>
4.3 VDC in
TX?
YES
Is
U201 Pin18
AT 4.54
VDC?
YES
Is
RF level at
U201 Pin 32
>-30 dBm?
YES
Are
R231,R232,
R233,C231,C232,
& C233
OK?
YES
Replace
U201
NO
Check Q260,
Q261 & R260
NO
U201
YES
pin 2 at
>3V in Tx and
<0.7V in
Rx
NO
NO
Replace U201
NO
If L261, C263 & C264
are OK, then see VCO
troubleshooting chart
Replace or
NO
resolder
necessary
components
Start
Visual
check of the
Board OK?
YES
YES
+5V
at U201
NO
Pin's
13 & 30?
Check5V
Regulator
Are
NO
signals at
Pin's 14 &15
of U201?
YES
Is
there a short
NO
between Pin 47 and
Pins 14 & 15 of
U201?
YES
Remove
Shorts
TROUBLESHOOTING CHARTS
3.3V at
NO
Check U248,
U201 pins 5,
L201 & L202
20, 34&
36
YES
Is
Is
16.8MHz
16.8MHz
NO
Signal at
signal at
U201 Pin
U201 pin
19?
23?
YES
Check
FL201, C206,
C207, C208,
CR203 & R204
Are
Waveforms
NO
at Pins 14 & 15
triangular?
YES
Pins 7,8 & 9
NO
of U201 toggle
when channel is
changed?
Check prgramming
lines between
U409 and U201
Pins 7,8 & 9
NO
information
from mP
Check uP U409
Troubleshooting
Chart
Replace U201
Replace
U201
YES
NO
Do
YES
Is
U409
YES