Zenith D952X - Page 21

FM - MULTIPLEX ALIGNMENT PROCEDURE - CHASSIS 5WDR50X, (XI )
FM - MULTIPLEX ALIGNMENT PROCEDURE - CHASSIS 15WDR51
19
STEP
CONNECT
SCOPE AND/
OR VTVM
CONNECT
GENERATOR
DUMMY
ANTENNA
INPUT
SIGNAL
FREQUEN CY
BAND
SET DIAL TO
ADJUST
PURPOSE
NOTE -
’ PLACE BAND
FOR FOLLOW
SWITCH IN FM-STEREI
ING ADJUSTMENTS U
3 AND AFC TN OFF.
SE 98MHz OR OTHER CLEAR RF FREQUENCY NEAR CENTER SC/J
iLE.
1
Test Point
"R" Pin 4
on T301
Test Point H"
Disconnect FM
Antenna
300 Ohm
98MHz
10% Pilot
FM
98MHz
T301
Adjust 19kHz Amp for
maximum.
,, Test Point
U," Junct. of
CR301 and
CR3O2
2
T302
Adjust 19kHz Amp for
maximum.
3
Test Point
" Z ”
Left
Output
98MHz
10% Pt lot
L+R, L — R,
(L only)
T303
Adjust 38kHz Amp for
maximum L Channel
reading to provide
maximum separation.
Test Point
"X"
Right
Output
4
R305
Adjust for minimum R
Channel reading to
provide maximum
separation.
5
Test Point
" Z "
Left
Output
98MHz
10% Pilot
L+R, L-R,
(R only)
Adjust for minimum,
should be equal to
step 4.
STEP
CONNECT
SCOPE AND/
OR VTVM
CONNECT
GENERATOR
DUMMY
ANTENNA
INPUT
SIGNAL
FREQUENCE
BAND
SET DIAL TO
ADJUST
PURPOSE
NOTE •
- PLACE BANE
3SWITCH IN FM STERE
O POSITION. USE RF FREQUENCY NEAR CENTER SCALE.
1
Test Point
Test Point "A"
300 Ohm
98MHz
FM
98MHz
T301
Adjust 19kHz Amp for
M
FM Antenna
10% Pilot
T302
■ rnaxirnurrL
2
NOTE — Stereo Indicator Lamp may be on
or off during the above steps.
3
98MHz
5% Pilot R302
Adjust mute control to
point where stereo lamp
lights up.
NOTE — Stereo Indicator Lamp rpust remain
on during the following steps.
4
"L" Tape
Output
98MHz
10% Pilot
L+R, L-R,
(Mod. LOnly)
T303
Adjust for maximum L
Channel reading.
"R" Tape
Output
5
T303
if necessary
Adjust for minimum R
Channel reading.
6
REPEAT STEPS 4 and 5 for MINIMUM CHANGE.
To providemax. separation.