Kenwood TKR-740 Service Manual

Also see for TKR-740: Brochure & specs Instruction manual Service manual Instruction manual

4TKR-740 DISASSEMBLY FOR REPAIR■ Compatibility informationThere are some important notices when you replace theControl, RX and TX units.If you need to change either the RX or TX unit from TYPEA to TYPE B.Firmware and Control unitCompatibility Chart “26A4” or earlier version “C77F” or later versionX53-3880-10 (Old) X53-4210-10 (New)OLD: TYPE A Available NOT availableRX: X55-3050-XX Causes unlock condition *1TX: X56-3040-10NEW: TYPE B NOT available AvailableRX: X55-308X-XX Causes unlock condition *2RX/TX TX: X56-3140-10unit Combination-1 *3RX: X55-3050-XX (Old)TX: X56-3140-10 (New) NOT available *3Combination-2 *3 RX or TX unit will causes unlock conditionRX: X55-308X-XX (New)TX: X56-3040-10 (Old)• K, K2, K3 typesFirmware and Control unitCompatibility Chart “26A4” or earlier version “6784” or later versionX53-3882-71 (Old) X53-4210-10 (New)OLD: TYPE A Available NOT availableRX: X55-3050-11 Causes unlock condition *1TX: X56-3072-70NEW: TYPE B NOT available AvailableRX: X55-3082-70 Causes unlock condition *2RX/TX TX: X56-3102-70unit Combination-1 *3RX: X55-3050-11 (Old)TX: X56-3102-70 (New) NOT available *3Combination-2 *3 RX or TX unit will causes unlock conditionRX: X55-3082-70 (New)TX: X56-3072-70 (Old)• E typeNote :*1. To enable use of TYPE A combination, circuit modifications are required. Please refer to “NEW CONTROL unit (X53-4210-10)circuit modification to use old RX and TX unit” described on page 5.*2. To enable use of TYPE B combination, a Firmware update and circuit modifications are required. Please refer to “OLDCONTROL unit (X53-388X-XX) circuit modification to use new RX and TX unit” described on page 5.*3. Combination of old and new RX and TX units is not available. As a result, the old and new Control unit is not available.1. Another RX or TX unit also needs to be replaced withTYPE B. *32. “C77F” or later (K,K2,K3 types), “6784” or later (Etype) firmware versions must be applied to that radio.