Panasonic SG-40 - Radio Alignment Procedures; AM-IF and RF Alignment; FM Alignment Procedures; VU Meter Alignment

ENGLISH
SG-40 __SG-40
ALIGNMENT INSTRUCTIONS(RADIO-2)
# FM Stereo Alignment
ALIGNMENT INSTRUCTIONS(RADIO-1)
Control Positions:
Volume Control
Function Selector
FM Preset
Loudness
FM Preset Volume (VR104 ~ VR109)
Preset Volume (VR101, 102, 110)
FM Mode Switch
Speaker Switch
Output of signal generator should be no higher than necessary to obtain output reading.
Make certain that speaker system is connected to the receiver when aligning.
(or use 42 dummy load resistors.)
FREE RUN ALIGNMENT
EQUIPMENT CONNECTION |
Center (AM-IF, RF, FM-RF), Minimum (FM-IF)
LW, MW; FM
MANUAL, P1, P2, P3, P4, P5 and P6
ADJUST REMARKS
Adjust VR302 for 19 kHz +50 Hz on frequency counter
reading.
SEPARATION ALIGNMENT
Connect Stereo Modulator to EXT, Mod. terminal of signal generator.
Modulation Rate of 19 kHz Pilot Signal
Modulation Rate of Right and Left Signal
Output Level
Adjust balance control so that output level from both channels becomes equa!.
Connect frequency counter to TP301 and TP206 (Earth) |
at 98 MHz, non modulation with 60 dB input. VR302
Turn them fully counterclockwise.
Turn set to the center position.
FM MONO and FM AUTO
1. Stereo Modulator:
2. Signal Generator:
30% {1 kHz)
SCOONOAARWN >
=
3. Tuner (Balance Control):
EQUIPMENT CONNECTION
ADJUST REMARKS
SIGNAL GENERATOR OR
SWEEP
GENERATOR
SIGNAL
GENERATOR
VRVM OSC] LLOSCOPE
RADIO DIAL
SETTING
INDICATOR
(VTVM or SCOPE)
ADJUST REMARKS
Adjust VR301 for minimum indication of VTVM
from the left side output when the right side of
stereo modulation is modulated.
Adjust VR301 in the same way for the right side.
Adjust for best balance between ‘‘L to R" and
““R to L" separation.
CONNECTION | FREQUENCY
Connect vertical
amp. input of
scope to terminals
of VTVM.
Connect to EXT. FM
antenna terminal
through dummy antenna.
VR301
(Separation
Control)
Connect across
speaker jack.
(Imp. 42)
AM-IF AND RF ALIGNMENT
ps se Point of non-
with 400 Hz interference
T201 (AM CFT)
T202 (AM DET)
*Adjust for maximum
output.
NOTE: When aligning separation, disconnect frequency counter.
150 kHz
30% Mod.
with 400 Hz
*Adjust for maximum
output.
*Refer to NOTE.
150 kHz
(7.9 mm)
L2 (LW ANT Coil)
L202 (LW OSC Coil) = FM Muting, Tuning Indicator Alignment
Fashion loop of
several turns of
wire and radiate
signal into loop
of receiver.
SIGNAL GENERATOR
CONNECTION FREQUENCY
FM MUTING ALIGNMENT
Output meter
across speaker
jack (L).
(Imp. 49)
STEP ADJUST REMARKS
350 kHz. 350 kHz
30% Mod. (61-6 can)
with 400 Hz ee
a |
S50 kHz 550 kHz
30% Mod. ree aaalie
with 400 Hz mm
“Adjust for maximum
output.
* Repeat steps (2) and (3).
CT202 (LW ANT Trimmer)
CT204 (LW OSC Trimmer)
Connect to EXT. FM
antenna terminal through | 30% Mod.
dummy antenna (3002) with 400 Hz, Stereo Mode
Common to chassis. with 9% pilot signal
Be Miz *Turn the signal at 25 dBiinput on Mono position.
*Set on Stereo position and adjust VR201 to turn
on the muting at 25 dB input.
*Adjust for maximum
output.
*Refer to NOTE.
L1 (MW ANT Coil)
L201 (MW OSC Coil)
1500 kHz
30% Mod.
with 400 Hz
1500 kHz
(81.6 mm)
CT201 (MW ANT Trimmer)
CT203 (MW OSC Trimmer)
*Adjust for maximum
output:
*Repeat steps (4) and (5).
Note: Cement antenna coil (L1 and L2) with wax after completing alignment.
FM-IF ALIGNMENT
“7
High side
through 0.01nF
between point
TP IN and TPE
(Earth)
10.7 MHz
(400 kHz
SWP.)
Point of non-
interference
Connect vert. amp
input of scope
between point
TP201 and TP206
(Earth)
2 Noconnection
4
No signal
Free
*Adjust L3 for maximum
amplitude and symmetri-
cal curve.
Connect DC VTV
VTVM between
TP202 and TP204
T203 (FM Disc)
*Adjust T203 for O mV on
L VTVM reading.
Note: As three output reading will be present, adjustments must be made at center frequency.
= FM-RF Alignment
SIGNAL GENERATOR
CONNECTION
FREQUENCY
RADIO DIAL
SETTING
INDICATOR
(VTVM or SCOPE)
FM
PRESET
BUTTON
ADJUST REMARKS
Connect to EXT.
FM Antenna
terminal through
dummy antenna
108.3 MHz
30% Mod.
with 400 Hz
108.3 MHz
87.35 MHz
30% Mod.
with 400 Hz
87.35 MHz
Output meter across
speaker jack (L)
MANUAL Adjust for maximum
output.
Repeat steps (1) ~(3).
Note: To correct the drift of FM band coverage (87.5 ~ 108 MHz), adjust VR 101, 102 and 110
FM MONO DISTORTION ALIGNMENT
Connect to EXT.
FM antenna
terminal through
dummy antenna.
98 MHz
100% Mod.
with 400 Hz
Distortion meter
to speaker jack
L).
MANUAL
T204
(FM Disc)
Adjust for minimum
distortion meter
indication.
2 VU Meter Alignment
VTVM CONNECTION
Positive Negative
TAPE DECK
CONDITION
DOLBY NR
SWITCH
ADJUST REMARKS
TP803
TP805
No connection
IN
* Apply 150 mV, 1 kHz to AUX.
* Adjust Rec Volume to get 580 mV
reading on VTVM.
REC Volume
* Adjust VR601 and VR602 to light at
+3 dB (QOmark).
* Confirm that the +3 dB LED is dislighted
by attenuating the input signal by 1 dB.