Samsung RCD-750 - 2-Band (FM;AM) Adjustment Procedures

7-1-2. 2Band(FM/AM) adjustment
CONNECTION STEP $.S.G RADIO DIAL Adjustment RESULT
Frequency SETTING Point e
Connect FM/AM IF gen- mene
erator
to
loop
ANT
Maximum
Couple the AM ANT 1 epaiilies Lowest frequency | IT1 output
coil
close
to
loop
ANT
(WHT)
and
best
and take out the eon Sie = = ee ee
from AM IF out point
(FIC1 pin No 19) 2 Repeat 1 until no futher
(See Fig. 3) improvement can be made.
AM OSC Best
3 515KHz Lowest frequency | coil (RED) resonating
OT101 point of SSG
AM
AM
OSC
Best
coverage Fig. 4 4 1650KHz highest frequency | trimmer resonating
VC4(VARICON) point of SSG
—_—__—-
5 Repeat steps 3 and 4 several times
Maximum
600KHz 600KHz output
AM ;
tracking Fig. 4 1400KHz 1400KHz AM Maximum
9: trimmer output
7 (VC3)(VARICON)
8 Repeat steps 6 and 7 to obtain suitable
sensitivity at 600KHz and 1400KHz.
AM IF OUTPUT : FIC1(KA2293) PIN NO. 19.
LOOP ANT
Stes ers AM SSG OUT, {O)
Oo
LOOP
ANT
60cm
AM ANT ct
FICT MAIN PCB
PIN NO 19 — ye
GND SPEAKER OUT AM ANT
Sur IN OUT
IN
DUMMY
LOAD
eee |V.T.V.M. OSCILLOSCOPE
IF GENERATOR
FIG. 3 FIG.4
- 33 - RCD-750