Am If And Rfalignment Procedure (Part Ii Lw Section) - Rotel Rx-403 Techische Beschreibung

SIGNAL
GENERATOR

AM IF and RFAlignment Procedure (Part II LW Section)

PART II: LW Section (LW/MW/FM
Instruments: AM Signal Generator and AC VTVM.
NOTES: Set Function
avoid AVC action.
Step.
Connected
Pin NO. 17 (on
IF PCB thru.
0.01 mfd capacitor
Test Loop
Radiates Signal
2
into ferrite loop
stick antenna
3
4 Repeat step 2 and 3 until no further improvement is noticed.
*NOTES: After adjustment, check to make sure that, indeed, both LW and MW alignment are in the best state.
Otherwise repeat LW and MW alignment procedure until no further improvement is noticed. (LW/MW/FM
only)
CHASSIS TOP
L 206
AM IFT
3rd.
G]
AM IFT
@ 2nd.
Fig. 4. AM IF and RF Alignment
Fig. 4. AM-ZF und HF.Abgleich
Fig. 4. Alignement AM IF et HF (LW)
only)
Selector Switch to LW position.
Generator
to Frequency
455KHz (400Hz
a Mod.)
160KHz (400Hz
Mod.)
330K (400Hz
30% Mod.)
(LW PORTION)
eoeee
CTS
LW ANT
1202
LW OSC
L 204
A M IFT
1st.
Hook-Up (LW)
(LW)
input signal must be kept as low as possible to
Tuning Dial
Setting
No any signal
at Low end of
Dial Scale
160K Hz on dial
scale
330K Hz on dial
scale
-8-
LOOI
LW OSC
• PIN 17
Adjust
L204, L205 and
L206 (on IF PCB)
L202 (OSC)
LOOI (ANT)
(REAR SIDE)
CT 7 (OSC)
CT6 (ANT)
Adjust for
Maximum reading
on AC VTVM