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2 - 2
SECTION 2
INSIDE VIEWS
Filter unit
PA unit
MAIN unit
PLL unit
¡
Top view (PA AND FILTER UNITS)
¡
Bottom view (MAIN AND PLL UNITS)
Rx RF preamplifier
(Q1401, Q1402: 2SK2171)
Tx mixer
(Q101, Q102: 3SK131)
1st LO amplifier
(Q201: 2SC4673)
Rx 1st mixer circuit
(64.455 MHz)
DDS gate allay IC
(IC6: SC-1246A)
Reference oscillator circuit
(Q9: 2SC2714,
X1: CR-337, 32.000 MHz)
+5V Reg.
(IC1: TA7805)
BFO DDS
(IC2: SC-1287)
Rx 1st IF amplifier
(Q1201: 3SK131)
2nd mixer circuit
(D401: HSB88WSTR,
Rx; 455 kHz, Tx; 64.455 kHz)
Predrive amplifier
(Q1: 2SC1971)
Tx/Rx switching relay
(RL13: AG201344)
Drive amplifier
(Q2, Q3: 2SC3133)
Power amplifier
(Q4, Q5: 2SC2904)
Tx 1st IF amplifier
(Q151: 2SK882)
MIC amplifier
(IC2201:
µ
PC5023)
Balanced modulator
Tx 455 kHz Modulator
(IC2301: NJM1496V)
USB, LSB, CW, RTTY filter
(FI611: FL-65)
Rx 2nd IF amplifier
(Q1301: 3SK131)
Tx 2nd IF amplifier
(Q502: 2SK882)
FAN control-2
(Q3601: 2SD1664)
FAN control-1
(IC2101: NJM2058M)
SWR detector
(L13: LR-391
D2, D3: 1SS375)
Tx low-pass filters
Summary of Contents for IC-718
Page 29: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 19 VOLTAGE DIAGRAM 25 Jun 2011 ...
Page 49: ...Jun 2011 20 C16 CP1 PLL UNIT BOTTOM VIEW FILTER UNIT BOTTOM VIEW PA UNIT BOTTOM VIEW ...
Page 81: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 16 VOLTAGE DIAGRAM 18 Jul 2009 ...
Page 196: ...9 4 VARISTOR BOARD BOTTOM VIEW PLL UNIT BOTTOM VIEW PA UNIT ...
Page 200: ...9 8 BOTTOM VIEW FILTER UNIT ...
Page 206: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13701MZ C1 q 2000 Icom Inc ...