Am If And Rfalignment Procedure (Part I Mw Section) - Rotel Rx-403 Techische Beschreibung

SIGNAL
GENERATO
L 206
AM IFT
L205
AM IFT
L 201.
2 nd.
AM IFT
1st.
Fig. 2. AM IF anf RF Alignment Hook-Up (AM/FM)
Fig. 2. AM-ZF und HF-Abgleich (AM/UKW)
Fig. 2. Alignement AM IF et HF (AM/FM)

AM IF and RFAlignment Procedure (Part I MW Section)

PART 1: MW Section (AM/FM,
Instruments: AM Signal Generator and AC VTVM.
NOTES: Set Function
possible to avoid A VC action.
Step
Connected
Pin NO. 20 (on
IF PCB) thru. a
1
0.01 mfd capacitor
Test Loop
Radiates Signal
2
into ferrite
stick antenna
3
Repeat Step 2 and 3 until no further improvement is noticed.
4
CHASSIS TOP VIEW(AM PORTION)
CT 5 CTL
AM ANT ,OSC
PIN
20
1203 5 e-
MW OSC
LW/MW/FM)
Selector Switch to MW or AM position.
Generator
to F requency
455KHz (400Hz
Mod.)
600KHz (400Hz
30% Mod.)
loop
1400KHz (400Hz
30% Mod.)
LOOI
SIGNAL
GENERATOR
Fig. 3. AM IF and RF Alignment
Fig. 3. AM-ZF und HF-Abgleich (LW/MW/UKW)
Fig. 3. Alignement AM IF et HF (LW/MW/FM)
Input signal must be kept as low as
Tuning Dial
Setting
NO any signal at
Low end Of Dial
scale.
600KHz on dial
scale
1400KHz on dial
scale
—6—
CHASSIS TOP VIEW
( MW/LW PORTION)
CTS
AM ANT, OSC
L 202
LW OSC
Hook-Up (LW/MW/FM)
Adjust
L204, L205 and
L206 (on IF PCB)
L203 (OSC) and
LOOI (FRONT
SIDE)
CT5 (ANT)
CT4 (OSC)
(all on V.C.)
LOOI
CTL
PIN
20
L203
MW OSC
Adjust for
Maximum reading
on AC VTVM