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