
TP9100 Service Manual
Frequency Synthesizer Fault Finding
195
© Tait Electronics Limited
May 2005
Task 27 —
Check Transmit
Buffer Amplifier
If no transmit frequency is detected but the switching network is not faulty,
check the transmit buffer amplifier. If the amplifier is not faulty, there might
be a fault in the transmit VCO that was not detected earlier.
1.
Remove the
VCO BOT
can.
2.
Check the transmit buffer amplifier in receive mode: Enter the
CCTM command
335 0
to set the transmit-receive switch off.
3.
Measure the voltage at pin 4 of
IC506
(see
4.
Then check the transmit buffer amplifier in transmit mode: Enter the
CCTM command
335 1
to set the transmit-receive switch on.
5.
Again measure the voltage at
IC506
.
6.
If the voltages are correct, the transmit VCO is suspect; go to
If they are not, the transmit buffer amplifier is suspect; go to
.
7.
Remove the
VCO TOP
can.
8.
Check the transmit VCO circuitry based on
Q510
(see
). Conclude with
9.
Check the buffer circuitry based on
IC506
(see
10.
If a fault is found, repair the circuit, and confirm that the voltages are
now correct. If they are, go to
. If they are
not, or if no fault could be found, replace the main board and go to
.
pin 4 of IC506: 0V DC (receive mode)
pin 4 of IC506: +3
±
0.2V DC (transmit mode)
Содержание TP9100
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Страница 74: ...74 Circuit Descriptions TP9100 Service Manual Tait Electronics Limited May 2005 ...
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Страница 100: ...100 General Information TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 126: ...126 Disassembly and Reassembly TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 148: ...148 Interface Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 158: ...158 Power Supply Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 250: ...250 Transmitter Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 268: ...268 Receiver Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 292: ...292 Spare Parts TP9100 Service Manual Tait Electronics Limited May 2005 Figure 13 1 Serviceable parts 3 3 3 4 4 3 4 ...
Страница 294: ...294 Spare Parts TP9100 Service Manual Tait Electronics Limited May 2005 ...
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