KENWOOD SERVICE BULLETINS BY NUMBER 11/21/89
SB # MODEL TITLE
1 (OBSOLETE)
2 TS-520 NOVICE OPERATION - 75 WATTS
3 QR-666 VFO STABILITY
4 TS-520 AM BROADCAST INTERFERENCE
5 TS-700A REPEATER MODIFICATION (EUROPE)
6 T-599D CHAIN DRIVE MODIFICATION
7 T-599A/D SERVICE NOTES
8 R-599A/D SERVICE NOTES
9 TS-820S SPEECH PROCESSOR ALIGNMENT
10 TR-7400A FINAL UNIT ARCING
11 TR-2200A ANTENNA ADAPTER
12 TS-820 AUX BAND INSTALLATION (RX ONLY)
13 TS-820 RIT MODIFICATION
14 TS-820 MICROPHONE INPUT ATTENUATOR
15 VOX-3 SENSITIVITY AND DELAY
16 TR-8300 ALIGNMENT
17 T-599D REDUCING 120HZ HUM
18 TR-7400A SERVICE NOTES
19 DG-1 NEW DISPLAY TUBE
20 TS-700A SERVICE NOTES
21 TS-520 SERVICE NOTES
22 TR-2200A SERVICE NOTES
23 TR-7200A SERVICE NOTES
24 TS-820S SERVICE NOTES
25 DG-5 REPAIR
26 DG-1 SERVICE NOTES
27 TS-700A 9 VOLT REGULATOR REPLACEMENT
28 DG-5 REPAIR NOTES
29 DG-5 THEORY OF OPERATION
30 TS-820S GENERAL ALIGNMENT PROCEDURE
31 R-599A/D REMOVING CB BAND
32 TR-7400A CHANGES IN PD UNIT
33 RM-76 FREQUENCY ERROR WITH TR-7600/7625
34 TR-7400A METER LAMP LONGER LIFE
35 MC-45 MODIFICATION FOR USE WITH TR-7400A
36 TS-180S DFC HUM WITH PS-30
37 TS-120S VOX OPERATION PICK-UP TIME
38 TS-120S FINAL TRANSISTOR REPLACEMENT
39 TR-7600/7625 ALTERNATOR WHINE
40 TS-120S ANTENNA INPUT TRANSFORMER REPLACEMENT
41 BS-8 ALIGNMENT WITH TS-180S
42 TS-180S IF #2 OUTPUT LEVEL CHANGE
43 TS-520S -6VDC SUPPLY FAILURE
44 TS-120S/180S PHONE PATCH TERMINAL ADDITION
45 TR-7600/7625 AUDIO TONE ON TX
46 TS-520 (S) CW FREQUENCY SHIFT
47 TS-180S INCREASE OF RX AUDIO OUTPUT
48 TS-120S HUM IN SSB TX
49 UHF/VHF OPTIONAL FILTER LIST
50 TR-7600/7625 OPTIONAL CERAMIC FILTER
51 TS-120S FINAL PROTECTION
52 TS-520 (S) BS-5 SWEEP INTERFERENCE
53 DG-1 STANDARD SERVICE
54 DG-5 STANDARD SERVICE
55 TS-180S LOW 40 MTR ALC
56 TS-180S DFC
57 SM-220 SHIELD INSTALLATION
58 TR-2400 TONE ENCODER RFI
59 RM-76 BATTERY BACK-UP POWER
60 TS-120S REPAIR NOTES
61 TS-180S TROUBLE SHEET
62 DK-520/DG-5 USE WITH TS-511/TS-900/T/R-599
63 TS-520 IF OUT FOR SM-220
64 TS-120S FULL CW OUTPUT IN SSB MODE (USE SB-944)
65 TR-7600/7625 RF POWER MODULE RETURNS (OBSOLETE)
66 SM-220 FEEDBACK FROM BS-8
67 TS-180S DFC INSTABILITY
801 TS-120S TX OSCILLATION (USE SB-844)
802 RM-76 MICROPROCESSOR FAILURE
803 TS-180S CW DELAY DURING VOX MEMORY OPERATION
804 TR-7625 INTERMITTENT TX
805 R-1000 MUTING
806 TR-7600/7625 MEMORY BATTERY BACK-UP
807 TR-2400 OPTIONAL CHARGE INPUT PROTECTION
808 TR-2400 OFFSET FAILURE
809 TR-2400 UNWANTED NOISE: TONE OR BURST AT TX
810 TR-2400 DISPLAY OR KEYBOARD TROUBLE
811 TR-2400 RX LOW, INTERMITTENT, OR DISTORTED
812 TS-520/820 CW FILTER SELECT CONTROL
813 R-1000 AGC, AM BANDWIDTH CHANGES
814 TR-2400 UNLOCK
815 TR-2400 PULSE NOISE
816 TS-120S BAND PASS FILTER CHANGE
817 TS-180S USE WITH A LINEAR AMPLIFIER
818 TR-2400 SCRATCHY TX
819 TR-2400 VOLUME CONTROL REPLACEMENT
820 TR-7625 FINAL MODULE REPLACEMENT
821 TS-120S TX OSCILLATION (USE SB-844)
822 TR-2400 BATTERY CHARGER FAILURE
823 R-1000 RF ATTENUATOR 10 DB STEP OPTION
824 TR-9000 CW/SSB TX INSTABILITY
825 TR-9000 TX PULSE NOISE IN SSB
826 TR-7625 HYBRID AMPLIFIER MODULE SUBSTITUTION
827 TS-120S VFO STABILITY
828 TR-7800 TONE PAD CONVERSION FOR 4TH COLUMN
FUNCTION
829 TR-7800 LOSS OF MEMORY
830 TR-2400 TX NOISE
831 TS-120S ANTENNA INPUT TRANSFORMER REPLACEMENT
832 TS-120S FULL CW OUTPUT IN SSB MODE (USE SB-844)
833 TR-7800/9000 OPTIONAL CERAMIC FILTERS
834 TR-7800 PULSE NOISE
836 TR-7800 OPTIONAL CONTINUOUS CHARGE FOR INTERNAL
BATTERY
837 TS-830S OPERATION ON 240V AC
838 VFO-230 OPERATION ON 240V AC
839 TS-180S VFO STABILITY
840 TS-830S FREQUENCY SHIFT
841 TR-7800 CLOCK AND DISPLAY FAILURE
842 DS-2 REPLACEMENT FOR DS-1A
843 TR-8400 SUB-AUDIBLE ENCODER INSTALLATION
844 TS-120S TX OSCILLATION
845 TR-8400 RX INTERNAL SPURIOUS SIGNALS
846 TR-7850 RF LED METER (LOW READINGS)
847 TS-830S LOW VOLTAGE SUPPLY OPTIONAL IMPROVEMENTS
848 TS-530S LOW VOLTAGE SUPPLY OPTIONAL IMPROVEMENTS
849 TR-9000 TRANSMITTER SIDEBAND CARRIER BALANCE
850 TS-180S LOW PASS FILTER OPTIONAL CHANGES
851 TS-830S NOISE BLANKER OPTIONAL IMPROVEMENTS
852 MC-46 DTMF OPERATION WITH OLDER EQUIPMENT
853 TR-8400 TRANSMITTER FREQUENCY RESPONSE VOICE OR
DTMF
854 TR-7730 TRANSMITTER FREQUENCY RESPONSE VOICE OR
DTMF
855 TR-8400 TRANSMIT DELAY TIME
856 TS-660 MICROPROCESSOR LATCH-UP
857 TS-830S TRANSMITTER "TALKBACK"
858 TR-2500 RX IMD IMPROVEMENT
859 TR-9000 TEMPERATURE STABILITY IMPROVEMENT
860 TR-7800/7850 MEMORY CH. 7 INDICATOR ERRATIC
861 TR-7800/7850 MEMORY IMPROVEMENTS
862 VFO-120 DIAL LAMP SWITCHING CIRCUIT
863 TS-930S INCORRECT LINE VOLTAGE SETTING (OBSOLETE)
864 SMC-25 MODIFICATION FOR USE WITH THE TR-2400
865 TS-430S 500KHZ HETERODYNE
866 TS-930S CW HETERODYNE TONE
867 TS-930S SSB TX TONE QUALITY
868 TS-930S LOW RX SENSITIVITY
869 TS-930S PLL UNLOCK
870 TR-7930/7950 RX INTERFERENCE
871 TR-9130 LOW DRIVE LEVEL
872 TS-930S CW PITCH TONE SHIFT
873 TS-930S CW VBT
874 TS-930S RF FEEDBACK
875 TS-930S RX AUDIO OSCILLATION
876 TS-930S RF FEEDBACK INTO MIC CIRCUIT
877 AT-930 SERVICE NOTES
878 TS-530S IF UNIT Q2, Q7 PROTECTION
879 TS-930S INCREASED TX AUDIO
880 TM-201/401 INCREASED TX AUDIO
881 TS-930S POWER SUPPLY SURGE PROTECTION
882 TS-430S NOTCH CONTROL
883 TS-430S AM WIDE/NARROW FILTER SELECTION
884 TS-930S 15 MTR INTERNAL BEAT NOTE
885 TS-430S RECEIVER INTERNAL BEAT
886 TS-930S INTERMITTENT TX POWER OUTPUT
887 TS-430S NOISE BLANKER IMPROVEMENTS
888 TS-430S INTERMITTENT PLL UNLOCK IN FM/AM
892 TM-411 LOW/NO RECEIVER SENSITIVITY
893 TS-930S NOISY POWER SUPPLY FAN
895 TS-430S PLL UNLOCK AT HIGH TEMPERATURE
896 TS-940S LCD CLOCK DISPLAY ERRATIC OPERATION
897 TM-211/411 AF GAIN CONTROL PART CHANGE
900 TS-940S PLL UNLOCK
901 TR-2600A PLL UNLOCK (TROUBLESHOOTING)
902 TS-430S LOW/INTERMITTENT RX
903 TR-2600A PLL UNLOCK
904 TM-2550 DCL CALL SIGN DATA
905 COAX CABLE WITH PLUG LIST
906 TM-2570 LOW TX POWER OUTPUT
907 TS-940S ANTENNA TUNER RELAYS
908 TS-940S PLL UNLOCK
909 TS-940S AVR UNIT CAPACITOR CHANGE
910 TS-940S AGC CIRCUIT IMPROVEMENTS
912 TS-940S TRANSMITTER HUM IN SSB
913 TS-940S SIGNAL TO NOISE RATIO IMPROVEMENT
914 HMC-1 NOT TO BE USED WITH TH-205ST/TH-215A
916 PS-50 IMPROVED VOLTAGE SURGE PROTECTION
917 TS-940S VCO CARRIER TO NOISE RATIO IMPROVEMENTS
918 TS-940S SQUELCH SWITCHING NOISE
919 R-5000 NO FREQUENCY CHANGE THROUGH COMPUTER
INTERFACE
920 TH-205/215 PROTECTION FUSE REPLACEMENT WITH DIODE
921 TS-940S SSB TALK POWER IMPROVEMENT
922 RC-10 HANG UP TIME/TIMEOUT TIMER SETTINGS
925 TM-3530A NOISY TRANSMIT
926 TW-4100A REPEATER STOP SCAN ON THE UHF BAND
927 RC-10 ALTERNATOR NOISE
928 TS-140S INTERMITTENT LOSS OF TRANSMIT POWER
929 TS-140S MOMENTARY TRANSMISSION WHEN VOX IS TURNED
ON
930 TM-721A MICROCOMPUTER LOCK-UP
931 TM-721A LOW/NO VHF TRANSMIT POWER
932 TH-25/45 W/TSU-6 TONE ALERT IMPROVEMENTS
933 TM-221A NO TX IN HIGH POWER DUE TO VOLTAGE DROP
934 TM-221A FINAL MODULE HINTS
935 TM-321A LOSS OF TX AUDIO WITH MC-48B
936 TM-721A S-METER DEFLECTION DUE TO PULSE NOISE
937 TM-721A AF PA WHITE NOISE WITH MC-48B
938 PS-430 VOLTAGE INCREASE WITH TH-205/215
939 TH-25/45 AUTOMATIC POWER OFF FUNCTION
941 SERVICE MANUAL RX SECTION LEVEL DIAGRAMS
942 SERVICE MANUAL TX SECTION LEVEL DIAGRAMS
944 TH-205/215 VOLUME/SQUELCH CONTROL IMPROVEMENTS
945 TH-205 SIGNAL TO NOISE RATIO IMPROVEMENTS
946 TH-215/415 TX SIGNAL TO NOISE RATIO IMPROVEMENT
947 TS-440S OPERATION WITH THE MC-85
948 TS-440S NOTCH FILTER LOW FREQUENCY IMPROVEMENTS
949 TS-440S PROTECTING Q33
950 TS-440S CASE SCREWS BINDING IN THE HEAT SINK
951 TS-940S ERRATIC DISPLAY (REMOVE THE SOCKET)
952 TS-440S INTERMITTENT OPERATION (REMOVE THE
SOCKET)
953 MC-55 CHANGE IN MIC ELEMENT (T91-0328-08)
954 TS-820S TA7201P SUBSTITUTION PARTS KIT