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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-4088SR

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   29
  • File size:  ∼ 1.00 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0030

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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SERVICE
MANUAL
PMR446 FM TRANSCEIVER
INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-4088SR PMR446 FM TRANSCEIVER at the time
of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 5.0 V. Such a connection
could cause a fire or electric hazard.
DO NOT expose the transceiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when
connecting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required

5030002520 LCD L2-0494TAY IC-4088SR Main unit 5 pieces
8810009560 Screw PH BO M2x6 ZK IC-4088SR Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
1. Make sure a problem is internal before disassembling the transceiver.
2. DO NOT open the transceiver until the transceiver is disconnected from its power source.
3. DO NOT force any of the variable components. Turn them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the transceiver is defective.
6. DO NOT transmit power into a signal generator or a sweep generator.
7. ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when
using such test equipment.
8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
To upgrade quality, all electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
MODEL Antenna size SYMBOL
IC-4088SR Short
Long EUR
Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom,
Germany, France, Spain, Russia and/or other countries.
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPITON
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -1
4-2 TRANSMITER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 ADJUSTMENT MODE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
7-1 CABINET PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7-2 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
SECTION 1 SPECIFICATIONS
‘ GENERAL
• Number of channel : 8 channels (simplex; 446.00625–446.09375 MHz)
• Type of emission : 8K50F3E (FM)
• Frequency stability : ±2500 Hz (±5.6 ppm)
• Frequency resolution : 12.5 kHz
• Antenna impedance : 50 ?
• Power supply requirement (negative ground) : 3 × AA (R6) dry, alkaline; or BP-202 (optional Ni-Cd battery pack)
• Current drain : Less than 140 mA
• Operating temperature range : –20°C to +55°C
• Number of CTCSS frequency : 38 (67.0–250.3 Hz)
• Dimensions (projections not included) : 52.5 (W) × 102.5 (H) × 26.9 (D) mm
• Weight (included 3 cells) : 200 g (Approx.)
‘ TRANSMITTER
• Output power : Less than 500 mW ERP
• Modulation system : Variable reactance frequency modulation
• Max. frequency deviation : ±2.5 kHz
• Spurious emissions : 0.25 µW
• Adjacent channel power : More than 60 dB
• External microphone connector : 3-conductor 2.5(d) mm/2.2 k?
‘ RECEIVER
• Receiving system : Double conversion superheterodyne system
• Intermediate frequency : 1st; 21.7 MHz
2nd; 450 kHz
• Sensitivity (12 dB SINAD) : 0.25 µV; –12 dBµ
• Adjacent channel selectivity : More than 55 dB
• Spurious response : More than 65 dB
• Intermodulation : More than 60 dB
• Audio output power : 100mW at 10% distortion with an 8 ? load
• External SP connector : 2-conductor 3.5(d) mm/8 ?
All stated specifications are subject to change without notice or obligation.
SECTION 3 DISASSEMBLY INSTRUCTIONS
Rear panel
Main unit
RF unit
Main unit
• REMOVING THE REAR PANEL
1 Unscrew 1 screw A, and 5 screws B.
2 Remove the rear panel in the direction of the arrow.
• REMOVING THE RF UNIT
1 Unscrew 2 screws H.
2 Unsolder 2 points I, and remove the RF unit.
• REMOVING THE MAIN UNIT
1 Remove 1 knob C, unscrew 1 nut D, and then remove 1
ring E.
2 Unscrew 1 screw F.
3 Unsolder 2 points G, and remove the MAIN unit in the
direction of the arrow.
SECTION 9 BOARD LAYOUTS
9-1 MAIN UNIT
• TOP VIEW
Q314 Q315
R395 C359
C343 R376
D314 D310
CL W305
C380 C379
R387 R393 C366 C372
C376 Q317
B6003A
R328 R418
C315 IC303 IC302
R347 D301
Q303R330
R362 Q304
C340 IC300
Q307 C324
C344 C348
D308 Q312
R382 R383
R373 C389
C367 R406
R384 R392
R385 S304
Q313 R388
C390 C398 R431
C329 C399
R301R300
to the RF unit J2
UNLK PLCK DATA PLSTB DASTB DACK GND SHIFT T+3 T+3
+3V MTX-00 PSC VCC GND GND MOD AFR+3 SQLIN SENS
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
S-13914IZ-C1-q
© 2003–2004 Icom Inc.


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