6815854H01-A
June 15, 2005
Troubleshooting Procedures
: 700–800 MHz Main Board Troubleshooting
4-23
4.9.1
Display Flashes “FAIL 001”
This display indicates a synthesizer "out-of-lock" condition. The following information will help to
trouble shoot the frequency generation unit to the component level. Perform the following checks to
determine the mode of the Fail 001:
1. Determine if the "out-of-lock" condition occurs in either receive mode, transmit mode, or both.
Also, check other frequencies programmed in the unit if available.
2. To determine if the "out-of-lock" is frequency or VCO dependant, place the unit into RF TEST
Mode, as described in the
ASTRO Digital XTL 1500 VHF/UHF Range 1/UF Range 2/700–
800 MHz Mobile Radio Basic Service Manual
(6815853H01) and step through each test
channel.
indicates the frequency and Aux logic level for each test mode channel.
In addition,
provides information about the frequency of operation for each VCO.
Table 4-13. Test Mode Channels (700–800 MHz)
Test
MODE
LV Frac-N
TX Logic
TX
Oscillator
TX Freq
MHz
LV Frac-N
RX Logic
RX
Oscillator
RX Freq
MHz
CHAN 1
AUX 1
U6754 osc1
762.0125
AUX 3
U6755 osc1
762.0625
CHAN 2
AUX 1
U6754 osc1
769.0125
AUX 3
U6755 osc1
769.0625
CHAN 3
AUX 1
U6754 osc1
775.9875
AUX 3
U6755 osc1
775.9375
CHAN 4
AUX 1
U6754 osc1
794.0125
AUX 4
U6755 osc2
851.0625
CHAN 5
AUX 1
U6754 osc1
805.9875
AUX 4
U6755 osc2
860.0625
CHAN 6
AUX 2
U6754 osc2
806.0125
AUX 4
U6755 osc2
860.0625
CHAN 7
AUX 2
U6754 osc2
823.9875
AUX 4
U6755 osc2
869.9375
CHAN 8
AUX 2
U6754 osc2
851.0125
AUX 4
U6755 osc2
851.0625
CHAN 9
AUX 2
U6754 osc2
860.0125
AUX 4
U6755 osc2
860.0625
CHAN 10
AUX 2
U6754 osc2
869.8875
AUX 4
U6755 osc2
869.9375
Table 4-14. VCO Frequency Calculation and Switching Logic (700–800 MHz)
MODE
Radio
Frequency
(MHz)
VCO
Frequency
Formula
VCO
Frequency
(MHz)
AUX
1
AUX
2
AUX
3
AUX
4
Rx
764.0125 -
775.9875
F(U6755 osc1) =
Fc + 73.35 MHz
837.3625 -
849.3375
Low
Low
HIgh
Low
Rx
851.0125 -
868.9875
F(U6755 osc2) =
Fc - 73.35 MHz
777.6625 -
795.6375
Low
Low
Low
HIgh
Tx (TA)
764.0125 -
775.9875
F(U6754 osc1) =
Fc
764.0125 -
775.9875
HIgh
Low
Low
Low
Tx(RPTR)
794.0125 -
805.9875
F(U6754 osc1) =
Fc
794.0125 -
805.9875
HIgh
Low
Low
Low
Tx(RPTR)
806.0125 -
823.9875
F(U6754 osc2) =
Fc
806.0125 -
823.9875
Low
HIgh
Low
Low
Содержание XTL 1500
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