Figure 4-1. Frequency Generator Unit Dc Power Supply Distribution (Vhf) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual
Vhf,
uhf range 1 and 2
700–800 mhz
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Also See for ASTRO Digital XTL 5000:
- Basic service manual (199 pages) ,
- User manual (162 pages) ,
- Instruction manual (38 pages)
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4-8
13.8 VDC
from Battery or
Power Supply
Q0503
Switched A+
Switched A+
(SW_A+)
U0950
9.3V Regulator
9.3V
Regulated
U0505
5.0V Regulator
5.0V
Regulated
U3750
3.0V Regulator
3.0V
Regulated
Y3750 16.8
MHz Reference
Oscillator and
U3752 Buffer
Figure 4-1. Frequency Generator Unit DC Power Supply Distribution (VHF)
May 25, 2005
Troubleshooting Procedures: VHF (136–174 MHz) Band Main Board Troubleshooting
Q3762 3rd
Q3756
Stage of RX
8.2V Superfilter
Injection
8.2V
Regulated
Q3753,Q3754
Q3761 1st
TX VCOs
Stage of RX
and
Q3751,Q3752
Injection
RX VCOs
U3751
LVFracN
U0951
9.1V TX
Regulator
Q3758 3rd
Stage of TX
Injection
Q3760 and
Q3759 TX
Injection
Q3769 2nd
Stage of RX
Injection
MAEPF-27803-O_VHF
Q0952
K9.1 Switch
K9.1
Q3758 3rd
Ste of TX
Injection
Charge Pump
Bias Q3755 and
Q3750, Prescaler
Amp Q3757
6881096C74-B
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