Tait TP9100, Service Manual, Page: 171 / 326

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
FEEDBA
CK
VO
LT
A
G
E
PIN 6 OF IC505
FEEDBA
CK
VO
LT
A
G
E
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
COLLECT
OR
OF Q505
COLLECT
OR
OF Q505
OUTPUT OF LOOP
FIL
TER A
T
C565
OUTPUT OF LOOP
FIL
TER A
T
C565
TP503
(JUNCTION OF
R566 AND R570)
TP503
(JUNCTION OF
R566 AND R570)
SIGNAL
TYPES
RF ANALOG CLOCK DIGIT
AL
PLL
LOOP
FIL
TER
AND
SUMMER
FIL
TERING
OF SUPPL
Y
FOR PLL
AND LOOP
FIL
TER
FCL
VCO
CIRCUITR
Y
FREQ
UENCY
SYNTHESIZER
PLL FEEDBA
CK
DIGIT
AL
CIRCUITR
Y
DIG SYN EN
SYN LOCK
DIG SYN F
AST
INVER
TER
JUNCTION OF
C541 AND R547
JUNCTION OF
C541 AND R547
R549
R544
+3V0 AN
L506
3V
SUPPL
Y
R542
REFERENCE FREQ
UENCY
C536
SYN CDC LFV
CDC
VCO MOD
SUPPL
Y FOR CHARGE PUMP
REFERENCE VO
LT
A
G
E
OUTPUT
PLL
LOOP
VO
LT
A
G
E
LOOP REF
.
+2V5 SYNC
LOOP REF
.
+2V5 SYNC
R5017
CODEC
AND A
UDIO
CIRCUITR
Y
+2V5 SYN
R568