Philips EM6E Service Manual page 98

8.2.4
Wireless Receiver Alignments
wireless receiver test circuit
Figure 8-6 Wireless receiver test circuit
Wireless Receiver functional check and adjustment table TV Mark 3 (EM6) versions
Powersupply Measurement
testpoint
check ground
F701
DC Check
F744
F701
Functional check
picture DUT:
RF input
signal,
modulation = RF carrier
Input signal
50 kHz via frequency
adaptation
network*
F748 863.3 MHz 1 mV rms
F748 433.3 MHz 1 mV rms
Alignment of the receiver EUR version
RF input
signal,
modulation = RF carrier
Input signal
50 kHz via frequency
adaptation
network*
F748 863.3 MHz 1 mV rms
F748 863.3 MHz 250 µV rms
F748 863.3 MHz 250 µV rms
F748 863.3 MHz 10 µV rms
F748 863.3 MHz 10 µV rms
Alignment of the receiver for some EU countries
RF input
signal,
modulation = RF carrier
Input signal
50 kHz via frequency
adaptation
network*
F748 433.3 MHz 1 mV rms
F748 433.3 MHz 250 µV rms
F748 433.3 MHz 250 µV rms
F748 433.3 MHz 10 µV rms
F748 433.3 MHz 10 µV rms
* e.g. SMT02
from Rohde &
Schwarz
To RX input
DUT
68 E
LF Voltmeter
e.g. PM2534
CL36532008_068.eps
Scope / Voltmeter
F702 +10V ± 0.1V
F740 + 5.2V ± 0.5V
F705 + 8V ± 0.5V
F707 + 8V ± 0.5V
F708 +3.6V ± 0.2V
F709 +7.75V ± 0.5V
F740 + 5.2V ± 0.2V
F712 + 4.1V ± 0.3V
F713 + 4.1V ± 0.3V
channel
Testpoints
switch
grounded to F744
select
F724 & F725 channel 1
F724 & F725 channel 1
channel
Testpoints
switch
grounded to F744
select
F724 & F725 channel 1
Remove
groundings F724 &
F725
channel 1
channel 1
channel 1
channel 1
channel
Testpoints
switch
grounded to F744
select
F724 & F725 channel 1
Remove
groundings F724 &
F725
channel 1
channel 1
channel 1
channel 1
Figure 8-7 Functional check and alignments table
Electrical Alignments
080503
Output signal Voltmeter version
for EUR and
F728 LF max output
UK version
for some
F728 LF max output
EU countries
Alignment Align Output signal
FM Detector
1710 F728
coil
Sliding stereo
3743 F747
signal
Sliding stereo reduce 3743
F747
signal slowly
Tuned/Muted
3741 F724
level
Tuned/Muted reduce 3741
F724
level slowly
Alignment Align Output signal
FM Detector
1710 F728
coil
Sliding stereo
3743 F747
signal
Sliding stereo reduce 3743
F747
signal slowly
Tuned/Muted
3741 F724
level
Tuned/Muted reduce 3741
F724
level slowly
EM6E AB
Voltmeter version
for EUR and UK
LF max output
version
for EUR and UK
>3 V DC
version
between 0.2 and for EUR and UK
3 V version
for EUR and UK
>2.5 V DC
version
for EUR and UK
< 1 V
version
Voltmeter version
for some EU
LF max output
countries
for some EU
>3 V DC
countries
between 0.2 and for some EU
3 V countries
for some EU
>2.5 V DC
countries
for some EU
< 1 V
countries
CL 36532008_148.eps
130503
8. EN 137