Sharp GF-4343H - Page 8

GF-4343H(S)
€) ~ MECHANICAL ADJUSTMENT
Except for the following item, refer to the RD-620E/D Service
Manual already issued.
ADJUSTMENT REMARKS (CHECK)
POINTS
Azimuth Sine waveform
adjusting screw attains the maximum.
Azimuth | Test tape
MTT-114
10 mrs
10 dB
TEST TAPE | __
MTT-114 -) UNIT
hey sel
—~10 d8 \
REC/PB R-ch
DUAL-TRACE
L-ch
SYNCROSCOPE
SPEAKER (+)
PLAYBACK mont 7
HEAD SPEAKER (+)
Figure 8—1 AZIMUTH
CIRCUIT ADJUSTMENT (TUNER SECTION)
AM IF/RF
SIGNAL 400 Hz, 30% AM modulated
GENERATOR
TEST FRE- DIAL AD-
STAGE | QUENCY |POINTER | JUST-
SETTING | MENT
MW IF |
High T3
frequency
aa
LW RF
145 kHz | Lowest L10
Band frequency
coverage
295 kHz | Highest TC8
frequency
4 170 kHz | 170 kHz
Tracking
) 5 | 270 kHz | 270 kHz
Repeat steps 2,3,4 and 5 until no further improvement can
be made.
Lowest L9
coverage
Highest TC7
frequency
ee Ce
L7
TC4
Repeat steps 7,8,9 and 10 until no further improvement
can be made.
coverage
L6
ie Tracking
as 1
Repeat steps 12,13,14 and 15 until no further improvement
can be made. ,
455 kHz
For UK:
468 kHz
Adjust for
best ‘‘IF’’ curve.
Adjust for
maximal output.
Adjust for
maximal output.
Le
Lowest L8
frequency
Highest TC6
frequency
Adjust for
maximal output.
ee F"
oscictoscope 'F curve
SWEEP
GENERATOR
MW/LW
TEST LOOP BAR ANTENNA
Figure 8—2 MW IF
ELECTRONIC
VOLTMETER |
SIGNAL MW/LW
GENERATOR
TEST LOOP BAR ANTENNA
Figure 8—3 LW/MW RF
#——e To Telescopic Rod Antenn3
R = 30 0hm
= h
Z= 50 ohm << o _ 19 pr ELECTRONIC
Z: Output impedance of signal generator VOLTMETER
To chassis GNO
SPEAKER (+)
SIGNAL
GENERATOR ox
Figure 8—4 SW RF