Troubleshooting
3 - 22
68P02963C70-O
Receiver Troubleshooting
No
No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Is the
gain below
4dB?
Is the
Gain still below
4db?
Is the
Gain still below
4db?
Check with all power
Input s/Output s o f Ant. SW .,
Front Filter (Fl500), LN A
(U500), Second Filter (Fl501),
Mixer (U504), Xt al Filter
(Fl502). Replace if necessary .
Check Front Gain again.
Check second LO .
-16dBm<Power<-10dBm
Freq.=219.3MHz
Re pa ir if necessary
(See Synth. Troubleshooting)
OK
Wa s that the
problem ?
Check 2.775V suppl y t o
LN A & Mixer and check
control lones (Q504, Q500).
Rep air if necessary .
Check Front Gain again.
Check Main Synth. Power
level (>-5dBm) and frequency .
F
F +109.65MHz).
Rep ai r i f necessary .
(See Synth. Troubleshooting)
main = rx
TetraCom Commands (TD M
Mode):
>Freq. RX 390.0125
>Mode RXTDM/Mode
RSSI
>LIMITER ON
>BER
Rout WPIC BaseBand signal
to test point s:
>WPI C 2 0 7 2 NOW
Activating control lines at
continuos mode:
WPI C 3 9 1 b NOW
Run RX_BER -112dBm &
ULTIMA TE_BER
Check BaseBand Output at
WPIC (U503) TP500/TP501.
Passed?
Return to first
test.
Check Front Gain, using
a R F probe on C536,
Frequency 109.65MHz
Replace if necessary.
Содержание MTH500
Страница 10: ...Contents x 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 14: ...Foreword xiv 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 18: ...Overview 1 4 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 50: ...Theory of Operation 2 32 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 76: ...Troubleshooting 3 26 68P02963C70 O Offset VCO Test ...
Страница 78: ...Troubleshooting 3 28 68P02963C70 O This page left blank intentionally ...
Страница 82: ...Programming the Radio 4 4 68P02963C70 O This page left blank intentionally ...
Страница 100: ...Maintenance 5 18 68P02963C70 O Figure 23 Exploded View 1 2 3 4 5 7 6 X6 8 ...
Страница 101: ...Maintenance 68P02963C70 O 5 19 Figure 24 Exploded View of Chassis Assembly 9 12 13 10 11 14 ...
Страница 102: ...Maintenance 5 20 68P02963C70 O ...
Страница 103: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 68P02963C70 O 6 1 Component Board Layouts ...
Страница 104: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 6 2 68P02963C70 O This page intentionally left blank ...
Страница 109: ...MTH500 Detailed Service Manual Schematic Diagrams and Parts Lists 68P02963C70 O 6 7 Schematic Diagrams and Parts Lists ...
Страница 134: ...SCHEMATIC DIAGRAMS MTH500 Flex CD 6 32 68P02963C70 O This page left blank intentionally ...
Страница 140: ...Replacement Parts and Kits 6 68P02963C70 O ...
Страница 141: ...Replacement Parts and Kits 68P02963C70 O 7 ...
Страница 142: ...Replacement Parts and Kits 8 68P02963C70 O ...
Страница 144: ...Test Equipment Service Aids Tools A2 2 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...