EasyManuals Logo

Motorola ASTRO Digital Spectra Service Manual

Motorola ASTRO Digital Spectra
426 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #219 background imageLoading...
Page #219 background image
Troubleshooting Charts 5-3
6881076C25-D October 28, 2002
Chart C.1 RF Board Back-End
Bad SINAD.
Bad 20Db Quieting.
No Recovered Audio.
Inject 1
st
IF
into Johnson connector
on RF board IF Freqs:
109.65MHz
Note: Inject Modulated On
Carrier Frequency
Signal As Required.
Change
Mode
Before Replacing
U301, Check 2nd
VCO.
"Second VCO Checks"
Check RX
Front End.
Check 2nd VCO
"Second VCO Checks"
Audio
Heard?
VCO
Locked?
2.1MHz
Check At
Pin 19
U301?
No
No
Yes
Yes
Yes
"Display Flashes
"FAIL 001""
No
14.4MHz
at ABACUS
U301 Pin
15?
Check U301 Voltages,
Programming, &
14.4MHz VCO
Components.
No
Yes
Activity
On U301
Sel Pin?
Check VOCON
Board.
No
Yes
MAEPF-25192-A

Table of Contents

Other manuals for Motorola ASTRO Digital Spectra

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Motorola ASTRO Digital Spectra and is the answer not in the manual?

Motorola ASTRO Digital Spectra Specifications

General IconGeneral
BrandMotorola
ModelASTRO Digital Spectra
CategoryRadio
LanguageEnglish

Related product manuals