Icom IC-F4261DS User Manual

SERVICE MANUAL
ADDENDUM
CONTENTS
REPLACEMENT PAGES . . . . . . . . . . . . . . . . . . . . . . 7-1 to 7-5
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 28
Otober 2012

Icom IC-F4261DS Specifications

General

Channel Capacity	1024 Channels
Modulation	FM
Dimensions	120 x 50 x 160 mm
Weight	1.2 kg
IP Rating	IP54
Operating Voltage	7.4V DC
Channel Spacing	12.5/25 kHz
Output Power	5W

Summary

SECTION 7. MECHANICAL PARTS

[CHASSIS PARTS]

Detailed list of chassis components with part numbers, descriptions, and quantities.

[MAIN-A UNIT] (For low band version)

[FRONT UNIT]

SECTION 1. SPECIFICATIONS

TRANSMITTER

RECEIVER

SECTION 4. CIRCUIT DESCRIPTION

4-1 RECEIVE CIRCUITS

Detailed description of the receive signal path from antenna to baseband IC.

4-2 TRANSMIT CIRCUITS

Detailed description of the transmit signal path from microphone to antenna.

4-3 FREQUENCY SYNTHESIZER CIRCUITS

Explanation of the VCO and PLL circuits for frequency control.

SECTION 5. ADJUSTMENT PROCEDURES

5-1 PREPARATION

5-2 FREQUENCY ADJUSTMENTS

Procedures for adjusting PLL lock voltage and reference frequency.

5-3 TRANSMIT ADJUSTMENTS

SECTION 11. VOLTAGE DIAGRAM

FRONT UNIT

MAIN-A/B/C UNIT (1/4)