Tait TB7100, Руководство по обслуживанию

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156 Frequency Synthesizer Fault Finding TB7100 Service Manual
© Tait Electronics Limited October 2005
Figure 11.5 Test and measurement points for the synthesizer PLL and loop filter
FEEDBACK
VOL
T
AGE
PIN
6
O
F
IC505
FEEDBACK
VOL
T
AGE
PIN
6
OF
IC505
P
IN1
6O
F
IC503
PIN
16
OF
IC503
P
IN5O
F
IC505
PIN
5
OF
IC505
P
IN8O
F
IC503
PIN
8
OF
IC503
P
IN1
4O
F
IC503
PIN
14
OF
IC503
P
IN1
0O
F
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)
SIGNA
L
TYPES
RF ANALOG CLOCK DIGIT
A
L
PLL
LOOP
FIL
TER
AND
SUMMER
FIL
TERING
OF
SUPPL
Y
FOR
PLL
AND
LOOP
FIL
TER
FCL
VCO
CIRCUITR
Y
FREQUENCY
SYNTHESIZER
PLL
FEEDBACK
CODEC
AND
AUDIO
CIRCUITR
Y
DIGIT
A
L
BOARD
DIG
SYN
F
AST
SYN
LOCK
DIG
SYN
EN
INVER
TER
VIA
T
O
CHECK
DIG
SYN
F
AST
VIA
T
O
CHECK
DIG
SYN
F
AST
VIA
T
O
CHECK
DIG
SYN
EN
VIA
T
O
CHECK
DIG
SYN
EN
VIA
T
O
CHECK
SYN
LOCK
VIA
T
O
CHECK
SYN
LOCK
R105 R104
JUNCTION
OF
C541
AND
R547
JUNCTION
OF
C541
AND
R547
R549
R544
+3V0
AN
L506
3V
SUPPL
Y
R568
R542
L102
REFERENCE
FREQUENCY
C536
SYN
CDC
LFV
CDC
VCO
MOD
SUPPL
Y
FOR
CHARGE
PUMP
REFERENCE VOL
T
AGE
OUTPUT
PLL
LOOP
VOL
T
AGE