Tait TP9100 - Page 206

206 Frequency Synthesizer Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
Figure 9.18 Test and measurement points for the FCL circuitry
IC502
13.012 MHz ±0.002 MHz
13 MHz
RF ANALOG CLOCK DIGITAL
SIGNAL TYPES
PSU
LPF
MIXER
VCXO
TCXO
MODULATOR BUFFER AMPLIFIER
AGND
DIGITAL
CIRCUITRY
CDC VCXO MOD
SYN CDC FCL
BUFFER AMPLIFIER
INTERFACE
CIRCUITRY
RECEIVER
FCL CIRCUITRY
+3V0 AN
SUPPLY
C536
R541
VCXO OUTPUT
AT C536
VCXO OUTPUT
AT C536
PLL
SYN RX OSC
C510
TP504
FEEDBACK
SIGNAL
SYN DIG FREF
TCXO OUTPUT
VCXO OUTPUT
AT R522
(PIN 1 OF IC501)
VCXO OUTPUT
AT R522
(PIN 1 OF IC501)
LO INPUT
AT R521
(PIN 4 OF IC501)
LO INPUT
AT R521
(PIN 4 OF IC501)
TP502
DIFFERENCE
FREQUENCY
TP500 TP501
DAC
ADC
CODEC 2
LOOP
VOLTAGE