Realistic PRO-2021 - Reception Check

RECEPTION CHECK
Tabie-1
POWER ON
Does
DISPLAY work
properly?
NO
YES
Does
SQ function
and scan when SQ
is ON?
NO
YES
Does
Key-in work
properly?
NO
YES
the Unit produci
NOISE when Volume
Control turned clockwise?
(SQ: counter-
lockwise
NO
Is reception
OK when correct
frequencies are
entered?
NO
YES
Does
Memory function
work OK?
NO
YES
із Backup battery OK?
Is CPU control circuit
(which consists of 018,
019, D26) OK?
is memory power
supply circuit (which
consists of IC 10) OK?
010 - 013
COLLECTOR
NOTE: 1+5.5V v
0>0V
Is DC-DC converter
OK? associated circuit OK?
Is Keyboard and/or
Is voltage Regulator ts1C11, and reset
OK? properly?
15 Band select (which
consists of ІС 8, 010-
Q13) OK?
Is IC 2 and/or
associated circuit OK?
Is PLL circuit (which
consists of IC1, 7)
OK?
Is Mute circuit (017,
1C 3) OK?
Is Power Suppiy
circuit OK?
Is Voltage Regulator
OK?
Is IC11 clock oscillation
waveform or reset OK?
Is CPU control circuit
OK?
Is 1C11 OK?
Is IF Amp or Noise
Amp circuit (1С2)
OK?
i ІС9
15 VCO circuit OK? სიმი Amp (IC 9) Is 1C11 OK?
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