Icom ID-51A Service Manual - Page 6

Top View, 2nd If Filter Band

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Page 6 highlights

• MAIN UNIT (TOP VIEW) CURRENT DETECTOR (IC5) ATT (Q907) ATT (Q906) RF AMP (Q780) D/A CONVERTER (IC952) LOCK VOLTAGE BUFFER (Q451) PLL IC (Band B) (IC450) +4 V REGULATOR (IC3) REFERENCE FREQUENCY OSCILLATOR (X1) DISCRIMINATOR (Band B) (X900) 2ND IF FILTER (Band B) (For FM and AM modes) (FI900) AM DETECTOR (Q904) POWER AMP (Q45) APC AMP (IC14) 3VS LINE REGULATOR (IC12) VCC LINE SW (Q8) VCC LINE SW (Q2) +5 V REGULATOR (IC15) PLL IC (Band A) (IC6) DISCRIMINATOR (Band A) (X2) 2ND IF FILTER (Band A) (For DV and FM-N modes) (FI1) AGC DETCTOR 2ND IF FILTER (Band A) (Q903) (For FM mode) (FI2) 2 - 2

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2 - 2
• MAIN UNIT
(TOP VIEW)
VCC LINE SW
(Q8)
POWER AMP
(Q45)
3VS LINE REGULATOR
(IC12)
PLL IC (Band A)
(IC6)
DISCRIMINATOR
(Band A)
(X2)
2ND IF FILTER (Band A)
(For DV and FM-N modes)
(FI1)
AGC DETCTOR
(Q903)
2ND IF FILTER (Band A)
(For FM mode)
(FI2)
DISCRIMINATOR
(Band B)
(X900)
PLL IC (Band B)
(IC450)
D/A CONVERTER
(IC952)
ATT
(Q906)
REFERENCE FREQUENCY
OSCILLATOR
(X1)
AM DETECTOR
(Q904)
APC AMP
(IC14)
+5 V REGULATOR
(IC15)
VCC LINE SW
(Q2)
ATT
(Q907)
CURRENT DETECTOR
(IC5)
LOCK VOLTAGE BUFFER
(Q451)
2ND IF FILTER (Band B)
(For FM and AM modes)
(FI900)
+4 V REGULATOR
(IC3)
RF AMP
(Q780)