Tait TP9100 - Page 171

TP9100 Service Manual Frequency Synthesizer Fault Finding 171
© Tait Electronics Limited May 2005
Figure 9.5 Measurement points for the synthesizer PLL and loop filter
FEEDBACK
VOLTAGE
PIN 6 OF IC505
FEEDBACK
VOLTAGE
PIN 6 OF IC505
PIN 16 OF
IC503
PIN 16 OF
IC503
PIN 5 OF
IC505
PIN 5 OF
IC505
PIN 8 OF
IC503
PIN 8 OF
IC503
PIN 14 OF
IC503
PIN 14 OF
IC503
PIN 10 OF
IC503
PIN 10 OF
IC503
COLLECTOR
OF Q505
COLLECTOR
OF Q505
OUTPUT OF LOOP
FILTER AT C565
OUTPUT OF LOOP
FILTER AT C565
TP503
(JUNCTION OF
R566 AND R570)
TP503
(JUNCTION OF
R566 AND R570)
SIGNAL TYPES
RF ANALOG CLOCK DIGITAL
PLL
LOOP
FILTER
AND
SUMMER
FILTERING
OF SUPPLY
FOR PLL
AND LOOP
FILTER
FCL
VCO
CIRCUITRY
FREQUENCY
SYNTHESIZER
PLL FEEDBACK
DIGITAL
CIRCUITRY
DIG SYN EN
SYN LOCK
DIG SYN FAST
INVERTER
JUNCTION OF
C541 AND R547
JUNCTION OF
C541 AND R547
R549
R544
+3V0 AN
L506
3V
SUPPLY
R542
REFERENCE
FREQUENCY
C536
SYN CDC LFV
CDC VCO MOD
SUPPLY FOR CHARGE PUMP
REFERENCE VOLTAGE
OUTPUT
PLL
LOOP
VOLTAGE
LOOP REF.
+2V5 SYNC
LOOP REF.
+2V5 SYNC
R5017
CODEC
AND AUDIO
CIRCUITRY
+2V5 SYN
R568