
June 15, 2005
6815854H01-A
4-24
Troubleshooting Procedures
: 700–800 MHz Main Board Troubleshooting
3. Continue troubleshooting by using the Fail 001 troubleshooting chart in Chapter 5.
4.9.2
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 U6751.
•
is a waveform representation during programming of the LV Frac-N
IC U6751.
Tx (TA)
851.0125 -
868.9875
F(U6754 osc2) =
Fc
851.0125 -
868.9875
Low
HIgh
Low
Low
Tx (TA) = Talkaround Mode
Tx(RPTR) = Repeater or trunked
Table 4-14. VCO Frequency Calculation and Switching Logic (700–800 MHz) (Continued)
MODE
Radio
Frequency
(MHz)
VCO
Frequency
Formula
VCO
Frequency
(MHz)
AUX
1
AUX
2
AUX
3
AUX
4
Summary of Contents for XTL 1500
Page 1: ......
Page 5: ...iv June 15 2005 6815854H01 A This page is intentionally left blank ...
Page 19: ...xviii List of Figures June 15 2005 6815854H01 A This page is intentionally left blank ...
Page 25: ...June 15 2005 6815854H01 A xxiv CommercialWarranty Notes ...
Page 35: ...June 15 2005 6815854H01 A xxxiv Model Numbering Charts and Specifications Notes ...
Page 49: ...June 15 2005 6815854H01 A 2 12 Product Overview Controller Section Notes ...
Page 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Page 225: ...June 15 2005 6815854H01 A 5 64 Troubleshooting Charts Flowcharts Notes ...
Page 429: ...8 2 Flex Cable Pin Out Lists Flex Cables June 15 2005 6815854H01 A Notes ...
Page 441: ...June 15 2005 6815854H01 A Glossary 10 Notes ...
Page 451: ...Index x June 15 2005 6815854H01 A This page is intentionally left blank ...