Motorola Professional GP640 Informations sur les services - Page 23

Parcourez en ligne ou téléchargez le pdf Informations sur les services pour {nom_de_la_catégorie} Motorola Professional GP640. Motorola Professional GP640 32 pages. Professional radio, power distribution and controller
Également pour Motorola Professional GP640 : Manuel de l'utilisateur (32 pages), Fiche technique (2 pages), Informations sur les services (28 pages), Informations sur les services (30 pages), Informations sur les services (26 pages), Informations sur les services (43 pages), Informations sur les services (30 pages)

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Motorola Professional GP640 Informations sur les services
1.0

Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)

A
START
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
A
udio
at pin 27 of
U301?
No
Spray of inject 1st IF into
XTAL Filter
IF Freq: 45.1MHz
Yes
Audio
B
heard?
No
Check 2nd LO Control Voltage at C363
Yes
VCO
B
locked?
No
16.8 MHz
Yes
at pin 22
U301?
No
Check FGU

TROUBLESHOOTING CHARTS

Yes
Check Controller
Before replacing U301, check 2nd
VCO Q320. Check VCO O/P level,
Chapter 3
A
Check Q320 bias
circuitry for faults.
Rotate Freq. Knob
Activity
No
on U301
LVZIF_SEL
pin?
Yes
Check controller
C351, C352.