Rf Unit 2 - Philips PM 5390 Service Manual

divider
1
(U2)
fp" a5...22MHz 1kHz 10kHz
801
\
Z7]7
low- pass
filter
f1
-f2 - 50... 220
MHz
802 803 804
_
50
"0p
J2p J22p
'"lOfi
w~
D
i
h
I
305
!LiJ1C90
r
;±
:.n
-306
9
10/11
j
CNT
1
ZSC^I
i
int.
power supply
m m
'
592
? 593
,
—
Dl
—
|i'
—
Dl
—
li'
220p
220p
until
LO 06
pos.323
NE550
R691
28 K
R692
1
K 62
23I 2t| I0I 11| 12| 13l 1S| 16| 17| 18| 19| 20|
Z?| 2B|
progromming inputs
MOD Vqq
phase comp. in
314 PCI
HEFW50
loop
filter
—
I
578
I
1
lOOn
I
0678
L^U-L
Frequency synthesizer
OUT R
ISA
|573
J574 J575
16n JOn
|6„|5,Neu
I"'
I
'4^^i^FR96
__533^
VC0
2b
— H
Prescaler 256;1
633 546
-
\360R\
II
In
progr. divider 2
597
—II—
12pF
308
HEFiOW
LIMJJJ
||661
-
5
MHz
ref. oscillator
666
|—
l
/54ff~|
—
J
J566
;^C548B
Jin
T
751
IsMHzTyynr.
J>p J..30^2£
548 638
-HI divider 5
128
•• 1
jS50
J551
S
JOOpJ22n Jo®
Vqq +12
Pin16
Vgs Pin 8
552j_
2p2
€ S
4-SC548SJ
Phase comparator
491 492 493 494
495
OV
F
A
E C,D
B
from
U2
may
be altered in test
Fig.
46
RFunit2