Realistic PRO-2004 - Reception Check

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RECEPTION CHECK
,
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Power ON
./
..
Do ..
NO
Display Work
:>
Properly?
./
YES
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Does SO
<
function and Scan
::>
NO
When SO is
ON?
YES
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Does
NO
KeV·in work
:>
.
properly?
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YES
Is Power Supply circuit
OK?
....... Doesthe
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Unit produce NOISE
NO
turned clockwise?
Is voltage Regulator
OK?
ISO:
counter-
clockwise)
YES
Is I
C503 clock
oscillation waveform
•
or r .. et OK?
15 reception
:> NO
OK when cOrrect
.
< frequencies are
entered?
Is CPU control circuit
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OK?
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.
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YES
t
Is Keyboard and/or
Is DC . DC converter
Is IC503 OK?
<
Doe<
OK?
associated circuit OK?
NO
Memorv function
:>
work OK?
YES
Is voltage Regulator 1$ IC503, and rese'
Is Back-up battery OK?
Is IC701 OK?
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OK?
properly?
END
Is CPU control circuit
Is RF filter select
Is IC1. IC2 and/or
-
(which consists of D49,
IIC501, Q501-507)
anccist
circuit OK?
030,31.34) OK?
OK?
-
+
.
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Is memory power supply
Is MODE lAM, NFM,
-
is IF Amp or Noise
Is Mute circuit nC4,
circuit (which consist
WFM) ,elect OK?
023,24,251 OK?
Amp circuit IIC1,IC21
of 1C9) OK?
(I C502, 027, 28, 291
OK?
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Is VCO (VCO I, VC02)
Is Audio Amp (IC7)
select OK?
Is IC503 OK?
lIC502, 0315, 316)
or Audio Pre Amp (leG)
OK?
Is VCO filter I, 2
select OK?
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IIC502, 0301,3021
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Is PLL circuit (which .
consists of IC301, 302,
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3031 OK?
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i
.
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Is VCO circuit OK?
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. -
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