Panasonic RF-2900LBS Serviceanleitung Seite 14

TUNE/BATT METER ADJUSTMENT
1. RADIO RECEIVER SETTING
• Set band switch to MW.
• Set volume control MIN,
• Set BFO switch to OFF.
• Set power source voltage to 9 volts DC.
ALIGNMENT INSTRUCTIONS
READ CAREFULLYBEFOREATTEMPTING ALIGNMENT
1. Set volume control to maximum.
2. Set power switch to ON.
3. Set bass and treble control to maximum.
4. Set band switch to LW, MW, SW', SW2,SW3or FM.
5. Set digital display switch to OFF position.
6. Set AM/SW RF gain control to high.
7. Light switch to OFF position.
8. Set FM AFC/Bandwidth switch to OFF/narrowposition
for the AM-IF,BFO, and FMadjustment,and to ON/wide
AM (LW, MW, SW) ALIGNMENT
SIGNAL GENERATOR or
BAND SWEEP GENERATOR
RADIO
CONNECTIONS FREQUENCY
SETTING
Fashion loop of
several turns of
455 kHz Point of non-
(1) AM
wire and radiate
Mod. interference.
signal into loop
at 400 Hz
of receiver.
Fashion loop of
several turns of
150 kHz
(2)
LW wire and radiate
150 kHz (Refer to fig. 23) across voice coil
signal into loop
of receiver.
(3)
LW
400 kHz
400
(Refer to fig. 24)
MW-RF ALIGNMENT
(4)
MW
550 kHz
550
(Refer to fig. 25) across voice coil
1500 kHz
(5)
MW
1500 kHz (Refer to fig. 26)
(*1)Cement antenna bobbin withwaxaftercompleting a lignment.
SW-1st IF and 2nd OSC ALIGNMENT
Connect to EXT
ant. terminal
(6)
through ceramic 2 MHz
Point Of non-
capacitor (10 PF).
interference.
Negative side
to earth
SWI-RF
(7) SWI Connect to EXT
3.5 MHz 3.5 MHz
ANT terminal.
(Refer to fig. 27) across voice coil.
(8)
8.0 MHz
8.0 MHz (Refer to fig. 28)
SW2-RF ALIGNMENT
(9) SW-a
8.0 MHz 8.0 MHz
(Refer to fig. 29)
(10)
SW2
16 MHz
16 MHz (Refer to fig. 28)
ALIGNMENT
2. REMARKS
• Adjust R129 so that the TUNING
pointer of meter stays
as shown in figure right.
BATTERY
position for other adjustment.
9. Set pitch control to center.
SetBFOswitchto ONpositionfor BFOadjustment,
10.
and to OFFposition for other adjustment.
11. Set SW Cal control to center.
12. Set power source voltage to 9V DC.
Outputof signalgenerator shouldbe no higherthan
13.
necessary to obtain an output reading.
DIAL
INDICATOR
ADJUSTMENT
REMARKS
(VTVM or SCOPE)
AM-IF ALIGNMENT
Output meter
1st FT)
Adjust
across voice coil.
T102(AM2nd IFT)
output
T104(AM3rd IFT)
LW-RF ALIGNMENT
Adjust for maximum
Output meter Ltt8(LW OSC coil)
output. Adjust 1-102 by
( * ANT
moving coil bobbin
coil)
along ferrite core.
CT112(LW OSC
Adjust
kHz
Trimmer)
output.
CT101(LW ANT
Repeat Steps (2)
Trimmer)
and (3).
Adjust for maximum
kHz
Output meter
L, , OSC coil
output. Adjust 1-102by
moving
ANT coil)
along ferrite
CTIII(MW OSC
Adjust
Trimmer)
output.
CTt02(MW ANT
Repeat steps (4)
Trimmer)
and 5).
L106(2nd OSC coil)
T105(SW 1st FT)
Adjust for maximum
T106(SW 1st IFT)
output.
ALIGNMENT
Output meter
L116(SW,OSC coil)
Adjust for maximum
L110(SWl ANT coil)
output.
CT110(SWl OS
Adjust for maximum
Trimmer)
output.
CT107(SW,ANT
Repeat steps (7)
Trimmer
and 8).
OSC coil)
Adjust
Lt09(SW2ANT coil)
output.
CT109(SW2 OSC
Adjust
Trimmer)
output.
CT106(SW2 ANT
Repeat steps (9)
Trimmer)
and (10).
RF-2900LBS RF-2900LBS
SW3
(11)
swa
(12)
potnter
SW3
(13)
(14)
D. AGC ALIGNMENT
SIGNAL GENERATOR
CONNECTION
• Connect to EXT
ANT terminal
through
Ceramic
Capacitor.
(IOPF).
Negative side
to earth.
• Output meter
(VTVM) across
voice coil.
for maximum
FM ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
BAND
for maximum CONNECTIONS
Connect to test
point V through
(1) FM
0.001 f. Negative
side to earth.
coil bobbin
core.
Connect to test
for maximum
point V through
(2)
FM FM dummy
antenna. (Refer
fig. 22).
(3)
FM
(4)
(*2)Three o utput responses
BFO ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
BAND
CONNECTIONS
for maximum
Fashion loop of
several turns of
for maximum
SWI
wire and radiate
signal into loop of
receiver.
SW3-RF ALIGNMENT
16 MHz
16 MHz
(Refer to fig. 29)
17 MHz 17 MHz
(Refer to fi . 30
30 MHz 30 MHz
(Refer to fig. 32)
28 MHz
28 MHz
(Refer to fig. 31)
ADJUSTMENT
FREQUENCY
1) Setsignalgenerator t o 3.5MHz(400Hz,30%mod.)
2) Setsignal g enerator inputtoapproximately 20dB(IOgV), tune
the radio,andthen increase signalgeneratorinputto 60dB
(I mV).
(3) Adjustthe volume control so that the speaker outputat this time
agrees with 0 dB (770 mV) of the IV range of the VTVM.
(4)
Thensetthesignalgenerator t o 100dB (100mV).
3.5 MHz
VR301
Make thefollowing adjustments according tospeaker o utput a t
(D. AGC)
this time.
(a) Almostnoattenuation (within—1.5dB)
No adjustment necessary
(b) Attenuation exceeding —1.5 dB
Rotate semi-fixed VR301 g raduallyuntiloutput
becomes — 1.5 dB.
Notethat semi-fixedVR30tshould first be rotated
completely counterclockwise, andthengradually
rotated clockwiseto adjust to the first position where
a reading of
(5)
Finally,switch the signal generatorinput to 60 dB and 100dB
andconfirm that the outputdifference is within —1.5dB
(120 mV/8n).
RADIO DIAL
INDICATOR
SETTING
(VTVM or SCOPE)
FREQUENCY
FM-IF ALIGNMENT
Connect vert. amp.
Point of non-
of scope to test point
10.7 MHz
i nterfere nce.
V . Negative side
to earth.
FM-RF ALIGNMENT
Variable
Output meter
87.5 MHz
capacitor
across voice coil.
to
fully closed.
90 MHz
90 MHz
(Refer to fig. 33)
106 MHz
106 MHz
(Refer to fig. 34)
willbepresent; proper tuning i sthe center frequency.
RADIO DIAL
INDICATOR
SETTING (VTVM or SCOPE)
FREQUENCY
BFO ALIGNMENT Note.
• Set band width switch to "Narrow".
Tune to
Audio output from
3.5 MHz
signal. L, 19(BFO OSC coil)
speaker.
Ltt4(SW3 OSC coil)
Adjust for maximum
out ut.
L108(SW3ANT coil)
CT108(SW3 OSC
Trimmer
Adjust for maximum
ANT
output.
Trimmer)
Repeat steps (I
(14).
REMARKS
— 1.5 dB is obtained.
ADJUSTMENT
REMARKS
Adjust for maximum
(FM IFT)
amplitude.
(Refer to fig. 21)
( * 2) Adjust for maxi-
(FM OSC coil)
mum output.
1-103(FM
( * 2) Adjust for maxi-
TUNE coil)
mum output.
CT104 (FM OSC
( * 2) Adjust for maxi-
Trimmer)
mum output.
CT,oa (FM TUNE
Repeat steps.
Trimmer)
ADJUSTMENT
REMARKS
1. Cut off modula-
tion after tune to
signal.
2.
set BFO
switch to ON.
3. Adjust for zero
beat.