Icom IC-718 Service Manual

2 - 1
SECTION 2 INSIDE VIEWS
Filter unitPA 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-1245A)
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: µPC5023)
Tx 455 kHz Modulator
(IC2301: MC1495)
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)
Tx low-pass filters
(L13: LR-391)

Icom IC-718 Specifications

General

Input voltage	13.8 V
Output power	100 W
Frequency range	0.5 - 1.799999 MHz
Channels quantity	101 channels
Compatible products	AH-2B; AH-4; AH-710; AT-180; CT-17; FL-222; FL-257; FL-52A; FL-53A; HM-103; LC-156; MB-120; MB-62; MB-63; MB-72; OPC-581; OPC-587; OPC-589; OPC-599; PS-125; SM-20; SM-30; SP-10; SP-41; UT-102;
Display type	LCD
Manual	Yes
Product type	Portable CB radio
Product color	Black
Housing material	Steel

Weight and Dimensions

Depth	239 mm
Width	240 mm
Height	95 mm