6815854H01-A
June 15, 2005
Troubleshooting Procedures
: UHF Range 1 (380–470 MHz) Band Main Board Troubleshooting
4-13
4.7.2
FGU Troubleshooting Aids
The following illustrations are additional service aids for troubleshooting the frequency generation
unit.
•
is a block diagram of the DC distribution for the frequency generation unit.
•
is a block diagram of the frequency generation unit.
•
describes the function of pins on the LV Frac-N IC U5752.
•
is a waveform representation during programming of the LV Frac-N IC
U5752.
Figure 4-4. Frequency Generation Unit DC Power Supply Distribution (UHF Range 1)
13.8 VDC
from Battery or
Power Supply
Audio
PA
Q5503 RFPA
Final
MRF1570
Q5502 RFPA
Driver
MRF1518
U5501 RFPA
Pre-driver
C65
Q0503
Switched A+
Switched A+
(SW_A+)
9.3V
Regulated
9.1V
Regulated
9.3V
Regulated
5.0V
Regulated
5.0V
Regulated
8.2V
Regulated
K9.1
3.0V
Regulated
U0950
9.3V Regulator
U0505
5.0V Regulator
U5301
5.0V
Regulator
U5750
3.0V Regulator
Y5750 16.8
MHz Reference
Oscillator and
U6752 Buffer
Q5752
8.2V Superfilter
Q5825, Q5826 TX VCOs
and
Q5901, Q5903, Q5905
RX VCOs
U5752
LVFracN
U5303 2nd
Stage of RX
Injection
Q5902, Q5904, Q5906
Stages of RX
Injection
U0951
9.1V TX
Regulator
Q5828 and
Q5829 TX
Injection
Q0952
K9.1 Switch
Q5501
TX
Buffer
Charge Pump
Bias Q5750 and
Q5751 , Prescaler
Amp Q5755
U5570
9.3V Regulator
A+
Содержание XTL 1500
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Страница 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
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