Philips PM 5390 Service Manual page 40

7-10
|<-56 dB
I
i
<-30 dBc
<-30 dBc
<-25 dBc
<-20 dBc
<-30 dBc
<-30 dBc
<-40 dBc
<-67 dBc
35mVntis..»
<300mVrms
35mVrms.,,
:S150mVrms
<
250Hz/rms
<100 Hz/rms
m = 50%+5%
m>
80%
Af = 75+ 1kHz
Af
= 25+2kHz
-16dB+1dB
RF-U1/L808/809
RF-U1/C599
RF-U2/R616
RF-U2/R626
R6B
1
/U3
RF-U1/C558
U3/R645/631
spectral purity
T non harmonics, check level ratio £ref = 39.0625 kHz to RF
carrier
I SPA setting:
BW =
3
kHz,
SW =
20 kHz, ST
= 50
ms
harmonics PM 5390
t
level ratio 2nd/3rd harmonics to RF carrier
freq. range
O.
1-340 MHz all harmonics
harmonics PM 5390S +SPA
setting: BW = 300 kHz, SW = 100 MHz, ST = Sms
-- non harmonics, select some frequencies
(PM 539o/PM539
OS)
check
freq.
190 MHz, adjust
by more/less compression
of
coils
check
at freq. 510 MHz, adjust to minimum
I
base signal level,
oscillator VC02a (ser. LO 04 onw.
measured at IC303 pin
16
I
base signal
level, oscillator VC02b
(ser.
LO
04 onw.)
measured at IC303 pin
16
T
residual FM
;
FAM setting;
FM, RMS, filter 10Hz/3kHz
check some
freq.
,
e.g.
10,
160,
170, 340, 435, 510, 680, 840, 850MHz
Modulation modes
AM ext.,
signal to MOD
IN: 10 kHznu, 0.5 Vpp,
check at freq.:
'20, 150, 190, 320, 490, 530, 660, 850,
1000 MHz
AM
ext., signal to
MOD IN: 20 kHz'^,
1
Vpp; check some RF
freq.
FM ext., signal to MOD
IN: 20 kHz~,
1
Vpp; adjust 0588
||
1
.2pF
. . .
3
.3pF
FM intern
Vl^,
SPA setting: BW = 300 kHz,
SVJ
=
5 liHz, ST = 5ms, Zero
residual
RF carrier, signal
to
VIDEO
IN: CVBS white
1
Vpp