Am Alignment Procedure - Rotel Rx-803 Technische Anleitung

Fig. 2.
Abb. 2.
Fig. 2.

AM Alignment Procedure

I nstruments: AM Signal Generator
Notes: Set Function Selector
Input signal must be kept as low as possible to avoid AGC action.
Step
Coupling
Pin No. 33 (on
IF board)
1
through a 0.01
mfd capacitor.
Test Loop
Radiate signal
2
into ferrite loop-
stick antenna.
3
4 Repeat steps 2 and 3 until no further
CHASSIS
REAR
LEFT
79
VR601
CHASSIS TOP VIEW
Power Amp Bias Adjustment
Meßanschluß zur Endverstärker-Vorspannungs-Einstellung
Schéma de montage du réglage de la polarisation de l'amplificateur
and AC VTVM.
switch to AM
Generator
Frequency
455kHz (400Hz
30% mod.)
600kHz (400Hz
30% mod.)
1400kHz (400
Hz 30% mod.)
RIGHT
VR602
(MAIN AMP PORTION)
Hook-up
Tuning Dial Output
Setti ng
Connected
Non interfering AC
TAPE OUT jack.
at low end of
scale.
600k
1400kHz
improvement is noticed.
6
DC
10 8
ADJUST VR601
602 TO OBTAIN
mV READING
MILLIVOLT METER.
de puissance
Indicator
Adjust
to
VTVM to L204 and
(on IF board)
L202 (OSC)
(on IF board)
and L003
ANT Coil.
CT2 (OSC),
CTI (ANT)
(on Front-end)
O
MILLIVOLT
METER
AND
7-5
ON DC
Adjust for
L203 Maximum
reading on
AC VTVM.
Trim