Kenwood TS-940 Manuals

Manuals and User Guides for Kenwood TS-940. We have 1 Kenwood TS-940 manual available for free PDF download: Manual

Kenwood TS-940 Manual (71 pages)

Brand: Kenwood | Category: Receiver | Size: 3 MB

Table of Contents
3
My Opinions - What Were They Thinking
7
Troubleshooting and Adjusting the TS-940
7
About the Kenwood TS-940 Service Manual & Adjustment Procedures
8
Troubleshooting Common TS-940 Problems
9
Digital Control Problems
9
Digital "A" Unit
9
Digital "B" Unit
9
Digital "C" Unit
9
Digital Control System Problems and Maintenance
9
Compromised Wiring Connections
10
RAM Memory Content Corruption
10
When to Replace the RAM Battery
10
The TS-940 PLL System - the Ugly Details - a Deep Dive
11
The Complicated Details of the PLL Unit
11
TS-940 PLL Circuit Description - How It Works
11
PLL Reference Oscillator Input (OSC in )
11
20 Mhz Frequency Standard Fstd
12
PLL-0 (PLL Unit IC19) - HET Oscillator
12
PLL-1 (PLL Unit IC9)- 100 ~ 110 Mhz Reference
12
PLL-2 (PLL Unit IC8)
12
PLL-3 (PLL Unit IC17)
13
CAR Unit Pll's
13
PLL-4 (CAR Unit IC2)
14
PLL-5 (CAR Unit IC2)
14
Troubleshooting PLL Unlock Issues
15
PLL Unlock - the Dreaded "Dots" on the Frequency Display
15
The Problem
15
Adjustment Can Change Behavior but Is Seldom a Cure
15
Identifying the Cause of PLL Unlock
16
Common Problems
16
20 Mhz (10 Mhz) Reference Oscillator
16
Intermittent PLL Unlock Problems
16
Broken Wires, Cold Solder Joints
17
Service Bulletins
17
Wax in the PLL Vco's
17
The Myth that a Tweak of the HET Oscillator (L34) Fixes It All
18
Identifying Which PLL Is Unlocked
18
UNLOCK Signal
19
Which PLL Is Unlocked
19
Ok, What's Next
20
Single Failures
20
HET Oscillator PLL Unlock (IC19)
21
Wax in HET VCO
21
Multiple Failures
22
Frequency Standard
22
Band Information Problems
22
Troubleshooting PLL-2 (IC8)
22
PLL Interdependency #1 - PLL-2 (IC8)
22
Troubleshooting - PLL-3 (IC17)
23
PLL-3 Troubleshooting Hints HINT #1
23
After the Unlock Problem Is Fixed
25
TS-940 Adjustment Procedure Updates
27
Amendments and Updates to the TS-940 Adjustment Procedures
27
Initial Setup
27
Voltage Adjustment and Configuration
28
Amended Voltage Adjustment and Configuration
28
Adjusting the PLL and CAR Units
29
Beware of the Kenwood Procedures
29
Adjusting for Optimum Results
29
Revised Kenwood TS-940 PLL VCO, and CAR Unit Adjustments
30
Important Adjustment Notes
30
Detail Description of PLL/VCO Adjustment Steps
30
PLL Unit Adjustment Procedures
32
RF VCO Adjustment Procedures
33
CAR Unit Adjustment Procedures
34
More TS-940 Adjustments
35
Receiver Adjustments
35
Receiver Band Pass Filter, MCF, and RF Trap Adjustments (Rx Adjustment Steps 1 - 5)
35
Step 1 - Band Pass Filter
35
Step 2 - Monolythic Crystal Filter
36
Step 3 - Receive RF Amplifier
36
Step 4: Notch Filter
37
Step 5 -Rx if Trap
37
Understanding and Adjusting the TS-940 S-Meter
39
IARU S-Meter Calibration Standard
39
Understanding AGC Adjustment Procedures
39
The S-Meter "SLAM" Problem
41
TS- 940 RX S-Meter Adjustment - Calibrator Method
42
TS-940 RX S-Meter Adjustment - Signal Generator Method
43
Improved S-Meter Adjustment (by Jeff Gagnon)
44
Transmitter Adjustments
45
Tx Drive and if Amp Adjustment Procedure (Tx Adjustment Steps 2 and 5)
45
Error in the Transmitter Adjustment Procedure Step 5
45
Understanding and Adjusting the ALC Meter for Accuracy
45
Best Operating Practices Using the ALC Meter Indication
48
General TS-940 Technical Notes and Observations
49
Test Equipment
49
What Test Equipment Do You Really Need
49
Do You Really Need the "Required Test Equipment" Listed in the Service Manual
49
RF and AF Voltmeter
50
Measuring RF Voltages
50
Measuring AF Voltages
50
Measuring Signal Levels
50
Obtaining the Correct Signal Levels for Adjustments
51
Kenwood Signal Level Notations for Signal Tracing
52
Spectrum Analyzer
53
Do You Really Need a Spectrum Analyzer
53
AF/RF Signal Generators
53
AF Signal Generator
53
RF Signal Generator
53
RF Sweep Generator
54
Adjusting Band Pass and Monolithic Crystal Filters
54
Probes for Your Test Instruments
54
VOM Probes
54
Scope Probes
54
RF Detector Probes
54
TS-940 Adjustment Point Diagrams
56
TS-940 Top Chassis Adjustment Points
56
PLL Unit Test and Adjustment Points
57
This Excellent Detailed Reference for PLL Unit Testing Is Provided Courtesy of Jeff Hilliard
57
TS-940 CAR Digital B Unit Test and Adjustment Points
58
TS-940 Bottom Chassis Adjustment Points
59
TS-940 RF Unit Test and Adjustment Points
60
TS-940 Control Unit Test and Adjustment Points
61
TS-940 if Unit Test and Adjustment Points
61
KB7JS Mods and Enhancements
62
Making the TS-940 "DIM" Button Work with Leds in the Panel Meter
62
Kenwood Service Bulletins
66
Service Bulletin
68

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Kenwood TS-940 Manual (71 pages)

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