Figure 4-10. Frequency Generation Unit Dc Power Supply Distribution (700-800 Mhz) - 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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Troubleshooting Procedures: 700–800 MHz Main Board Troubleshooting
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
U6750
3.0V Regulator
3.0V
Regulated
Y6750 16.8
MHz Reference
Oscillator and
U6752 Buffer
Figure 4-10. Frequency Generation Unit DC Power Supply Distribution (700–800 MHz)
6881096C74-B
Q6763 2nd
Q6759
Stage of RX
8.2V Superfilter
Injection
8.2V
Regulated
U6754 TX VCOs
Q6762 1st
and
Stage of RX
U6755 RX VCOs
Injection
U6751
LVFracN
U0951
Q0952
9.1V TX
K9.1 Switch
Regulator
K9.1
Q6766 3rd
Ste of TX
Injection
Charge Pump
Q6764 and
Bias Q6757 and
Q6765 TX
Q6758, Prescaler
Injection
Amp Q6761
MAEPF-27803-O
4-25
May 25, 2005
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