Icom IC-7800 - Page 380

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L801

L834

L566

L565

J831

CP3

R2LO lock voltage

adjustment

T2LO output adjustment

R2LO lock voltage check point

R1101

CP1102

J561

T2LO output check point

2LO lock voltage check point

C546

2LO lock voltage adjustment

R1LO output adjustment

R357

R1 LO output check point

J351

L1408

L1058

RX sensitivity

adjustment (HF)

RX sensitivity adjustment

R1132

RX sensitivity adjustment

RX sensitivity check point

CP1103

RX sensitivity check point

R1228

L1411

L1402

L1404

L1410

L1401

L1403

RX sensitivity

pre-setting

• RXPLL-A UNIT TOP VIEW

Front panel

RXPLL-A unit (lower side)

• LOCATION

Main Page

ADDENDUM Dec. 20091
- PARTS LIST2
- BOARD LAYOUTS65
- VOLTAGE DIAGRAMS67
ADDENDUM Feb. 200979
- PARTS LIST80
- BOARD LAYOUTS139
- VOLTAGE DIAGRAMS143
ADDENDUM Aug.2008157
- PARTS LIST158
- BOARD LAYOUTS214
- VOLTAGE DIAGRAMS216
ADDENDUM Jul. 2008245
- PARTS LIST246
- BOARD LAYOUTS302
- VOLTAGE DIAGRAMS304
TOP COVER333
INTRODUCTION334
TABLE OF CONTENTS335
1.SPECIFICATIONS337
2.INSIDE VIEWS338
- TOP VIEW339
- BOTTOM VIEW339
- MAIN UNIT340
- DSP A/B BOARDS341
- DSP TX BOARD341
- LOGIC UNIT342
- SCOPE UNIT342
- RXPLL-A UNIT343
- RXPLL-B UNIT343
- OSC UNIT344
- PA200W BOARD344
3.CIRCUIT DESCRIPTION345
- RECEIVER CIRCUITS345
- TRANSMITTER CIRCUITS349
- PLL CIRCUITS351
- ANTENNA TUNER CIRCUITS355
- SCOPE CIRCUITS356
- POWER SUPPLY CIRCUITS357
- PORT ALLOCATIONS358
- IF AND LO FREQUENCY LIST372
4.ADJUSTMENT PRCEDURES374
- PREPARATION BEFORE SERVICING374
- OSC UNIT ADJUSTMENTS375
- RXPLL-A UNIT ADJUSTMENTS377
- RXPLL-B UNIT ADJUSTMENTS383
- PA200W BOARD ADJUSTMENTS389
- TUNER ADJUSTMENT391
- MAIN UNIT ADJUSTMENTS393
- SCOPE UNIT ADJUSTMENTS395
- SOFTWARE ADJUSTMENTS397
5.PARTS LIST400
- REPLACEMENT UNITS400
- FRONT UNIT400
- VR-A BOARD400
- VR-B BOARD400
- VR-C BOARD400
- VR-D BOARD401
- SW-A BOARD401
- SW-B BOARD401
- SW-C BOARD402
- JACK BOARD402
- MIC BOARD402
- TENKEY BOARD403
- PBT1 BOARD403
- PBT2 BOARD403
- LED BOARD403
- CF BOARD404
- DISPLAY BOARD404
- RXPLL-A UNIT406
- RXPLL-B UNIT414
- BPF UNIT422
- MAIN UNIT428
- DSP-A BOARD436
- DSP-B BOARD438
- DSP-TX BOARD440
- SCOPE UNIT442
- LOGIC UNIT446
- PA UNIT453
- PA200W BOARD453
- DC-DC UNIT454
- TUNER UNIT455
- CTRL BOARD455
- ANT-SW UNIT458
- OSC UNIT458
- REG UNIT459
- DIGSEL UNIT459
- NETWORK BOARD462
- FILTER UNIT462
- MEMORY BOARD463
6.MECHANICAL PARTS AND DIS ASSMBLY disassembly464
7.SEMI-CONDUCTOR INFORMATION476
- TRANSISTOR AND FET'S476
- DIODES477
8.BOARD LAYOUTS478
- DISPLAY BOARD478
- SW-A BOARD480
- SW-B BOARD480
- SW-C BOARD480
- VR-A BOARD482
- VR-B BOARD482
- VR-C BOARD482
- VR-D BOARD482
- JACK BOARD482
- MIC BOARD482
- CF BOARD482
- TENKEY BOARD484
- LED BOARD484
- PBT1 BOARD484
- PBT2 BOARD484
- LOGIC UNIT486
- MEMORY BOARD488
- MAIN UNIT490
- DSP-A/DSP-B BOARDS492
- DSP-TX BOARD494
- SCOPE UNIT496
- RXPLL-A UNIT498
- RXPLL-B UNIT500
- DIGSEL UNIT502
- OSC UNIT504
- ANT-SW UNIT506
- FILTER UNIT508
- NETWORK BOARD510
- CTRL BOARD512
- BPF UNIT514
- PA200W BOARD516
- DC-DC UNIT518
9.BLOCK DIAGRAM520
10.WIRING DIAGRAMS523
11.VOLTAGE DIAGRAMS525
- DISPLAY BOARD525
- CF BOARD525
- SW-A BOARD526
- VR-B BOARD526
- VR-C BOARD526
- VR-A BOARD526
- MIC BOARD526
- JACK BOARD526
- VR-D BOARD526
- SW-B BOARD526
- TENKY BOARD527
- SW-C BOARD528
- PBT1 BOARD528
- PBT2 BOARD528
- LED BOARD528
- LOGIC UNIT AND MEMORY BOARD529
- MAIN UNIT533
- DSP-A/DSP-B BOARDS536
- DSP-TX BOARD537
- SCOPE UNIT538
- RXPLL-A/RXPLL-B UNITS542
- DIGSEL UNIT545
- OSC UNIT547
- ANT-SW UNIT548
- FILTER UNIT548
- BPF UNIT549
- NETWORK BOARD550
- CTRL BOARD551
- PA200W BOARD552
- DC-DC UNIT553
ADDRESS554
BACK COVER555

Icom IC-7800 - Page 380

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