Sharp GF-777H - Page 15

OSCILLOSCOPE
MW/LW
SIGNAL
GENERATOR
TEST
LOOP
BAR
ANT.
(J111,
J112)}
SWEEP TRIGGER MY
Figure 15-1
AC V.T.V.M
SIGNAL Mw/LW
GENERATOR
TEST LOOP BAR ANT.
Figure 15-2
[> To TEST POINT (TP1)
cpa R c R = 30 ohm
1 ral =
1x Z = 50 ohm 2. ERR
i a Z: Output impedance of signal generator muon
SIGNAL TO CHASSIS GND (TP2)
GENERATOR
TP2 (GND)
Figure 15-3
Oscilloscope “S" curve
SIGNAL GENERATOR
:
el Art
AMPLIFIER °
,O « ° ° o” “ol 4
TP2 (GND) TP4 (GND
| SWEEP TRIGGER, ,,, fen)
Figure 15-4
THE INSTRUCTION OF FREQUENCY ADJUSTMENT
In order to comply with FTZ
rule: Nr. 358/1970, please fix
the low end of dial frequency
(87.5MHz) and the high end of
dial frequency (107.9MHz) on
FM band, by adjusting oscilla-
tion coils (L4) and oscillation
trimmer (C19), respectively, as
illustrated in Figure 15-9.
C58 LW ANT.-
L2,L3 FMR
T1 FM IF
R21 FM Muting
—15—
AC V.T.V.M,
DUMMY (See Fig. 17-6)
SIGNAL GENERATOR
R1
TO TEST POINT (TP1)
R1 = 37.5 ohm
= 75 ohm
= R2 = 75 ohm
WB) R1 = 50 ohm
= 50 ohi
1 2 Ohne a /50 on
TO CHASSIS GND (TP2)
Z: Output impedance of signal generator
Figure 15-6 FM DUMMY
FREQUENCY
100 K ohm COUNTER
SIGNAL GENERATOR DUMMY (See Fig. 15-6)
TP2 (GND)
Figure 15-7
DUMMY (See Fig. 15-6)
D603 STEREO
SIGNAL
amg
FE
Zag
=
INDICATOR
TP2 (GND)
Figure 15-8
TP7 T4 TP3
AM IF
TP6 R27 VCO Adjust.
Figure 15-9