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August 16, 2007
6816985H01-B
6.3-22
UHF2 Troubleshooting Charts:
UHF Range 2 Transmitter RF Troubleshooting Chart
6.3.23UHF Range 2 Transmitter RF Troubleshooting Chart
MAEPF-27349-O
No/Low TX Power
Is B+ at
U101 pins 6,7,
and 14?
Is Vdc
at TP_146
>2V?
Is Vdc
at U101 pin 1
>2V?
Is Vdc
at R103
>1V?
Is
RF at U101
pin 16 >2
dBm?
No
No
Yes
Yes
Yes
Yes
Is
RF at U101
pin 6 >20
dBm?
Yes
Yes
Yes
Is
TX current
>300mA?
Is RF
input drive at
U101 pin 16
>2dBm?
Go to Frequency
Generation Unit
Chart
No
Check E102
and L130
No
Check E140
No
Check U102 IC
No
Check R108
No
Replace Q200
No
Go to Frequency
Generation Unit
Chart
No
Check C150,
C169, C100
and L130
Replace U101
Is B+
at L119?
No
Yes
No
Is
voltage drop
across D170
>0.5V?
Is
there RF
at connector
J101?
Check U102
and the ALC IC
Check C177, C174,
L172, C175, C172,
L171, C173, C170
and C171
Remove SH103
and Check
D171
Yes
Check C156, C159,
C160, C161, C157,
C158 and L139
*
*
*
*
*
*
*
*
*
For Analysis, shields SH103 and SH104 need to be removed.
= Transmitter enable Low.
Summary of Contents for ASTRO MT 1500
Page 4: ...iv Table of Contents August 16 2007 6816985H01 B Notes ...
Page 164: ...August 16 2007 6816985H01 B 5 6 Troubleshooting Procedures Operational Error Codes Notes ...
Page 188: ...August 16 2007 6816985H01 B 6 1 24 VHF Troubleshooting Charts Secure Hardware Failure Notes ...
Page 212: ...August 16 2007 6816985H01 B 6 2 24 UHF1 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 236: ...August 16 2007 6816985H01 B 6 3 24 UHF2 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 710: ...9 2 40 UHF1 Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 806: ...9 5 32 900MHz Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 816: ...Index 4 August 16 2007 6816985H01 B Notes ...
Page 817: ......