KENWOOD SERVICE BULLETINS BY MODEL               11/09/89


MODEL               SB #           TITLE

AT-930              877            SERVICE NOTES
BS-8                41             ALIGNMENT WITH TS-180S
DG-1                19             NEW DISPLAY TUBE
DG-1                26             SERVICE NOTES
DG-1                53             STANDARD SERVICE
DG-5                25             REPAIR
DG-5                28             REPAIR NOTES
DG-5                29             THEORY OF OPERATION
DG-5                54             STANDARD SERVICE
DK-520              62             DG-5 USE WITH TS-511/TS-900/T/R-599
DS-2                842            REPLACEMENT FOR DS-1A
HMC-1               914            NOT TO BE USED WITH TH-205AT/TH-215A
MC-45               35             MODIFICATION FOR USE WITH TR-7400A
MC-46               852            DTMF OPERATION WITH OLDER EQUIPMENT
MC-55               953            CHANGE IN MIC ELEMENT (T91-0328-08)
PS-430              938            VOLTAGE INCREASE WITH TH-205/215
PS-50               916            IMPROVED VOLTAGE SURGE PROTECTION
QR-666              3              VFO STABILITY
R-1000              805            MUTING
R-1000              813            AGC AM BANDWIDTH CHANGES
R-1000              823            RF ATTENUATOR 10dB STEP OPTION
R-5000              919            NO FREQ CHANGE BY COMPUTER INTERFACE
R-599A/D            8              SERVICE NOTES
R-599A/D            31             REMOVING CB BAND
RC-10               922            HANG UP TIME/TIMEOUT TIMER SETTINGS
RC-10               927            ALTERNATOR NOISE
RM-76               33             FREQUENCY ERROR WITH TR-7600/7625
RM-76               59             BATTERY BACK-UP POWER
RM-76               802            MICROPROCESSOR FAILURE
SM-220              57             SHIELD INSTALLATION
SM-220              66             FEEDBACK FROM BS-8
SMC-25              864            MODIFICATION FOR USE WITH THE TR-       
                                   2400
T-599A/D            7              SERVICE NOTES
T-599D              6              CHAIN DRIVE MODIFICATION
T-599D              17             REDUCING 120Hz HUM
TH-205              945            SIGNAL TO NOISE RATIO IMPROVEMENT
TH-205/215          920            PROTECTION FUSE REPLACEMENT WITH        
                                   DIODE
TH-205/215          944            VOLUME/SQUELCH CONTROL IMPROVEMENT
TH-215/415          946            TX SIGNAL TO NOISE RATIO IMPROVEMENT
TH-25/45            932            W/TSU-6 TONE ALERT IMPROVEMENTS
TH-25/45            939            AUTOMATIC POWER OFF
TM-201/401          880            INCREASED TX AUDIO
TM-211/411          897            AF GAIN CONTROL PART CHANGE
TM-221A             933            NO TX IN HIGH POWER DUE TO VOLTAGE      
                                   DROP
TM-221A             934            FINAL MODULE HINTS
TM-2550             904            DCL CALL SIGN DATA
TM-2570             906            LOW TX POWER OUTPUT
TM-321A             935            LOSS OF TX AUDIO WITH MC-48B
TM-3530A            925            NOISY TRANSMIT
TM-411              892            LOW/NO RECEIVER SENSITIVITY
TM-721A             930            MICROCOMPUTER LOCK-UP
TM-721A             931            LOW/NO VHF TRANSMIT POWER
TM-721A             936            S-METER DEFLECTION DUE TO PULSE         
                                   NOISE
TM-721A             937            AF PA WHITE NOISE WITH SQUELCH ON
TR-2200A            11             ANTENNA ADAPTER
TR-2200A            22             SERVICE NOTES
TR-2400             58             TONE ENCODER RFI
TR-2400             807            OPTIONAL CHARGE INPUT PROTECTION
TR-2400             808            OFFSET FAILURE
TR-2400             809            UNWANTED NOISE: TONE OR BURST AT TX
TR-2400             810            DISPLAY OR KEYBOARD TROUBLE
TR-2400             811            RX LOW INTERMITTENT OR DISTORTED
TR-2400             814            UNLOCK
TR-2400             815            PULSE NOISE
TR-2400             818            SCRATCHY TX
TR-2400             819            VOLUME CONTROL REPLACEMENT
TR-2400             822            BATTERY CHARGER FAILURE
TR-2400             830            TX NOISE
TR-2500             858            RX IMD IMPROVEMENT
TR-2600A            901            PLL UNLOCK (TROUBLESHOOTING)
TR-2600A            903            PLL UNLOCK
TR-7200A            23             SERVICE NOTES
TR-7400A            10             FINAL UNIT ARCING
TR-7400A            18             SERVICE NOTES
TR-7400A            32             CHANGES IN PD UNIT
TR-7400A            34             METER LAMP LONGER LIFE
TR-7600/7625        39             ALTERNATOR WHINE
TR-7600/7625        45             AUDIO TONE ON TX
TR-7600/7625        50             OPTIONAL CERAMIC FILTER
TR-7600/7625        65             RF POWER MODULE RETURNS (OBSOLETE)
TR-7600/7625        806            MEMORY BATTERY BACK-UP
TR-7625             804            INTERMITTENT TX
TR-7625             820            FINAL MODULE REPLACEMENT
TR-7625             826            HYBRID AMPLIFIER MODULE SUBSTITUTION
TR-7730             854            TX FREQUENCY RESPONSE VOICE OR DTMF
TR-7800             828            TONE PAD CONVERSION FOR 4th COLUMN      
                                   FUNCTION
TR-7800             829            MEMORY LOSS SUPERSEDED BY SB-861
TR-7800             834            PULSE NOISE
TR-7800/7850        860            MEMORY CH. 7 INDICATOR ERRATIC
TR-7800/7850        861            MEMORY IMPROVEMENTS
TR-7800/9000        833            OPTIONAL CERAMIC FILTERS
TR-7850             846            RF LED METER (LOW READINGS)
TR-7930/7950        870            RX INTERFERENCE
TR-8300             16             ALIGNMENT
TR-8400             843            SUB-AUDIBLE ENCODER INSTALLATION
TR-8400             845            RX INTERNAL SPURIOUS SIGNALS
TR-8400             853            TX FREQ RESPONSE VOICE OR DTMF
TR-8400             855            TRANSMIT DELAY TIME
TR-9000             824            CW/SSB TX INSTABILITY
TR-9000             825            TX PULSE NOISE IN SSB
TR-9000             849            TRANSMITTER SIDEBAND CARRIER BALANCE
TR-9000             859            TEMPERATURE STABILITY IMPROVEMENT
TR-9130             871            LOW DRIVE LEVEL
TS-120S             37             VOX OPERATION PICK-UP TIME
TS-120S             38             FINAL TRANSISTOR REPLACEMENT
TS-120S             40             ANTENNA INPUT TRANSFORMER               
                                   REPLACEMENT
TS-120S             48             HUM IN SSB TX
TS-120S             51             FINAL PROTECTION
TS-120S             60             REPAIR NOTES
TS-120S             64             FULL CW OUTPUT IN SSB MODE (USE SB-     
                                   844)
TS-120S             801            TX OSCILLATION (USE SB-844)
TS-120S             816            BAND PASS FILTER CHANGE
TS-120S             827            VFO STABILITY
TS-120S             821            TX OSCILLATION (USE SB-844)
TS-120S             831            ANTENNA INPUT TRANSFORMER               
                                   REPLACEMENT
TS-120S             832            FULL CW OUTPUT IN SSB MODE (USE SB-     
                                   844)
TS-120S             844            TX OSCILLATION
TS-120S/180S        44             PHONE PATCH TERMINAL ADDITION
TS-140S             928            INTERMITTENT LOSS OF TRANSMIT POWER
TS-140S             929            MOMENTARY TX WHEN VOX IS TURNED ON
TS-180S             36             DFC HUM WITH PS-30
TS-180S             42             IF #2 OUTPUT LEVEL CHANGE
TS-180S             47             INCREASE OF RX AUDIO OUTPUT
TS-180S             55             LOW 40 MTR ALC
TS-180S             56             DFC
TS-180S             61             TROUBLE SHEET
TS-180S             67             DFC INSTABILITY
TS-180S             803            CW DELAY DURING VOX MEMORY OPERATION
TS-180S             817            USE WITH A LINEAR AMPLIFIER
TS-180S             839            VFO STABILITY
TS-180S             850            LOW PASS FILTER OPTIONAL CHANGES
TS-430S             865            500KHz HETERODYNE
TS-430S             882            NOTCH CONTROL
TS-430S             883            AM WIDE/NARROW FILTER SELECTION
TS-430S             885            RECEIVER INTERNAL BEAT
TS-430S             887            NOISE BLANKER IMPROVEMENTS
TS-430S             888            INTERMITTENT PLL UNLOCK IN FM/AM
TS-430S             891            PLL UNLOCK AT HIGH TEMP. (USE SB-       
                                   895)
TS-430S             895            PLL UNLOCK AT HIGH TEMPERATURES
TS-430S             902            LOW/INTERMITTENT RX
TS-440S             947            OPERATION WITH THE MC-85
TS-440S             948            NOTCH FILTER LOW FREQUENCY              
                                   IMPROVEMENTS
TS-440S             949            PROTECTING Q33
TS-440S             950            CASE SCREWS BINDING IN THE HEAT SINK
TS-440S             952            INTERMITTENT OPERATION (REMOVE          
                                   SOCKET)
TS-520              2              NOVICE OPERATION (75 WATTS)
TS-520              4              AM BROADCAST INTERFERENCE
TS-520              21             SERVICE NOTES
TS-520              63             IF OUTPUT FOR SM-220
TS-520(S)           46             CW FREQUENCY SHIFT
TS-520(S)           52             BS-5 SWEEP INTERFERENCE
TS-520S             43             -6VDC SUPPLY FAILURE
TS-520S/820S        812            CW FILTER SELECT CONTROL
TS-530S             848            LOW VOLTAGE SUPPLY OPTIONAL             
                                   IMPROVEMENTS
TS-530S             878            IF UNIT Q2-Q7 PROTECTION
TS-660              856            MICROPROCESSOR LATCH-UP
TS-700A             20             SERVICE NOTES
TS-700A             5              REPEATER MODIFICATION (EUROPE)
TS-700A             27             9 VOLT REGULATOR REPLACEMENT
TS-820              12             AUX BAND INSTALLATION (RX ONLY)
TS-820              13             RIT MODIFICATION
TS-820              14             MICROPHONE INPUT ATTENUATOR
TS-820S             9              SPEECH PROCESSOR ALIGNMENT
TS-820S             24             SERVICE NOTES
TS-820S             30             GENERAL ALIGNMENT PROCEDURES
TS-820S             954            TA7201P SUBSTITUTION PARTS KIT
TS-830S             837            OPERATION ON 240V AC
TS-830S             840            FREQUENCY SHIFT
TS-830S             847            LOW VOLTAGE SUPPLY OPTIONAL             
                                   IMPROVEMENTS
TS-830S             851            NOISE BLANKER OPTIONAL IMPROVEMENTS
TS-830S             857            TRANSMITTER "TALKBACK"
TS-930S             863            INCORRECT LINE VOLTAGE SETTING          
                                   (OBSOLETE)
TS-930S             866            CW HETERODYNE TONE
TS-930S             867            SSB TX TONE QUALITY
TS-930S             868            LOW RX SENSITIVITY
TS-930S             869            PLL UNLOCK
TS-930S             872            CW PITCH TONE SHIFT
TS-930S             873            CW VBT
TS-930S             874            RF FEEDBACK
TS-930S             875            RX AUDIO OSCILLATION
TS-930S             876            RF FEEDBACK INTO MIC CIRCUIT
TS-930S             879            ALC LEVEL DRIFT 28 MHz CW
TS-930S             881            POWER SUPPLY SURGE PROTECTION
TS-930S             884            15 MTR INTERNAL BEAT NOTE
TS-930S             886            INTERMITTENT TX POWER OUTPUT
TS-930S             893            NOISY POWER SUPPLY FAN
TS-940S             896            LCD CLOCK DISPLAY ERRATIC OPERATION
TS-940S             900            PLL UNLOCK
TS-940S             907            ANTENNA TUNER RELAYS
TS-940S             908            PLL UNLOCK
TS-940S             909            AVR UNIT CAPACITOR CHANGE
TS-940S             910            AGC CIRCUIT IMPROVEMENTS
TS-940S             912            TRANSMITTER HUM IN SSB
TS-940S             913            SIGNAL TO NOISE RATIO IMPROVEMENT
TS-940S             917            VCO CARRIER TO NOISE RATIO              
                                   IMPROVEMENT
TS-940S             918            SQUELCH SWITCHING NOISE
TS-940S             921            SSB TALK POWER IMPROVEMENT
TS-940S             951            ERRATIC DISPLAY (REMOVE SOCKET)
TW-4100A            926            REPEATER STOP SCAN ON THE UHF BAND
VFO-120             862            DIAL LAMP SWITCHING CIRCUIT
VFO-230             838            OPERATION ON 240V AC
VOX-3               15             SENSITIVITY AND DELAY
                    49             UHF/VHF OPTIONAL FILTER LIST
                    905            COAX CABLE W/PLUG LIST
                    941            SERVICE MANUAL RX SECTION LEVEL         
                                   DIAGRAMS
                    942            SERVICE MANUAL TX SECTION LEVEL         
                                   DIAGRAMS