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FT-990
Yaesu FT-990 Manuals
Manuals and User Guides for Yaesu FT-990. We have
4
Yaesu FT-990 manuals available for free PDF download: Service Manual, Operating Manual, Manual
Yaesu FT-990 Service Manual (348 pages)
Brand:
Yaesu
| Category:
Transceiver
| Size: 53.47 MB
Table of Contents
Contents
2
Introduction
3
Chip Component Information
4
Ceramic Capacitors
4
Tantalum Capacitors
4
Resistors
4
Replacing Chip Components
5
Precautions for Chip Replacement
5
Removing Chip Components
5
Installing a Replacement Chip
6
Cover Removal and Board Access
7
Pilot Lamp Replacement
8
Board Locations
9
Alignment
10
Alignment Preparation and Precautions
10
Local Unit
11
3Rd Local BPF
11
Reference Frequency
11
36.269-Mhz 2Nd Local Buffer
11
PA Unit
12
LPF Unit
12
Pll VCV
12
Final Idling Unit
12
Tuning Capacitor/Motor
13
SWR Meter Calibration
13
Tuner Impedance
13
Tuner Unit
13
Default Beeper and Sidetone Levels
14
IF Unit
14
High SWR Sensing
14
2Nd/3Rd Local Buffer Level
14
Receiver Circuits
15
IF Shift Zero Set
15
IF Interstage Transformers
15
IF Notch Depth
15
RF AGC and S-Meter Calibration
16
Noise Blanker
16
FM Detector Output Level
16
RTTY and PKT Jack Receiver AF out Levels
16
Transmitter
17
AF out and DVS-2 Jack Receiver AF out Levels
17
Carrier Level
17
Transmitter if Interstage Transformers
17
IC Meter Zero Set
18
Overcurrent ALC
18
RF Unit
18
AM Peak Output
19
Reverse ALC
19
Transmitter if Gain
19
ALC Meter Calibration
19
AM Carrier/Modulation Level
20
Tx AFSK Tone Level
20
Transmitter if Gain II
20
FM and CTCSS Devitation
20
Comp Meter Calibration
21
VCC/IC Meter Calibration
21
Antenna Tuner Power
21
Transmitter Carrier Point
21
Block Diagram
26
Interconnection Diagram
31
AF Unit
126
PLL DDS and Carrier DDS Units
174
Control Unit
183
100-W Power Amp Unit
216
Tuner Main Unit
222
Tuner Control Unit
242
Connector Unit
249
Protector Unit
252
Display Unit
254
Potentiometer Unit
275
Switch a Unit
277
Key Unit
283
Rotary Encoder Unit and Switch B Unit
289
Push Button Switch Unit and MIC Unit
291
Headphone Unit
293
DC Switch Unit
295
Regulator Unit
297
Motherboard
312
Power Supply Unit
327
Mechanical Details
331
Exploded View
332
PS Unit
332
Front Panel Assembly
333
Chassis Assembly
341
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Yaesu FT-990 Operating Manual (66 pages)
Yaesu FT-990 Transceiver Operating manual
Brand:
Yaesu
| Category:
Transceiver
| Size: 6.7 MB
Table of Contents
General Information
2
Specifications
3
Accessories & Options
4
Station Installation
6
Preliminary Inspection
6
Power Connection
6
Changing the Power Supply Setting for a Different AC Voltage Range
6
Transceiver Location
7
Antenna Considerations
7
Grounding
7
Adjusting the Front Feet
7
Connector Pinouts
8
Connecting External Accessories
9
Connecting a Linear Amplifier
10
Internal Adjustments
11
Button Beeper Volume
11
CW Sidetone Volume
12
CW Keyer Weighing Bug Simulation
12
Linear Amp T/R Switch
12
CW Keyer Switches Rear View
12
Mode-Specific Tuning Rates
13
Slow am Auto AGC
13
Control Unit Split Pad Locations
13
AGC Auto Jumper for am
14
Front Panel Controls
15
Display Brightness Adjustment
17
Top Access Panel Controls
21
Power up Selections
22
Rear Panel Connectors
23
Operation
26
Tuning Steps
26
Keypad Frequency Entry
26
General Coverage Reception
27
Button Beeper Settings
27
Blanking the 10'S-Of-Hz Digit
27
Dealing with Interference
28
Front End Attenuation
28
RF Gain Setting
28
AGC (Automatic Gain Control) Selection
28
Noise Blanker Setting
29
Bandwidth and if Shift Adjustment
29
IF Shift Adjustment
29
Digital Filter Adjustment
29
IF Notch Filter Adjustment
30
Special Tips for CW Reception: Pitch Setting and Spotting
30
Transmitting
31
Automatinc Antenna Matching
31
SSB Transmission
31
RF Speech Processor (FSP)
32
Adjusting Processor Frequency Shift
32
VOX (Voice-Actuated T/R Switching)
33
CW Transmission
33
Using the Internal Electronic Keyer
33
AM Transmission
34
FM Transmission
34
Clarifier (Rx/Tx Offset Tunting)
34
FM Repeater Operation
34
VFO B & Split Frequency Operation
35
Memory Functions
36
Memory Channel Storage
36
Checking Stored Memories
36
Memory Channel Operation/Recall
36
Memory Scanning
37
Memory Scan Skip
37
Memory Blanking
37
Optional Digital Voice Recorder
37
Digital Modes: AMTOR, RTTY & Packet
38
RTTY and AMTOR with a Terminal Unit
38
300-Baud Packet
39
Custom Packet Display Offset
39
Packet TNC Interconnections
39
1200-Baud FM Packet
40
CAT System Computer Control
41
Reading Transceiver Status
41
Status Update Data Organization
41
CAT Commands
42
Data Returned from FT-990
43
Selecting Update Data to Return
44
Read Flags Data
44
Read Meter Data
44
Coding Examples
44
Reading Returned Data
45
Installing Internal Accessories
46
TCX0-2 High-Stability Master Oscillator
46
Narrow CW & SSB if Filters
47
Installation for DC Operation
48
Block Diagram
49
Schematics
51
Yaesu FT-990 Operating Manual (65 pages)
high performance
Brand:
Yaesu
| Category:
Transceiver
| Size: 6.77 MB
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Yaesu FT-990 Manual (6 pages)
Transceivers with KPA/KAT500 Power Combo
Brand:
Yaesu
| Category:
Transceiver
| Size: 0.59 MB
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