Kenwood KRC-225 Service Manual

Also see for KRC-225: Instruction manual Nstruction manual Instruction manual

Contents

KRC-225/235/265/265S3COMPONENT DESCRIPTIONRef.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 LC72366-9592 System MI-COM. System controlIC2 TDA7461ND E-VOL. & N.C. MPX Controls sound volume. Selects each source.IC3 HD74HC27FP Mute logic 3-input NOR gate x 3IC4 TDA7384A or Power IC Amplifies power so that the speaker can drive audio signal.TDA7386IC5 LA3161 Equalizer amplifier Equalizer amplifier for cassette tape sound2SC2412K or BACK-UP detection While BACK-UP is added, a base becomes Hi, and Q50 isQ50 2SD601A (Momentary power down turned on.detection) SWQ51 2SB1443 While BACK-UP is added, AVR outputs +5V.Q52 2SC2412K or BACK-UP 5V AVR Q51 and Q52 is inverted Darlington connection.2SD601AQ53 DTA114YK or UN2114 P.ON 5V SW While a base becomes Lo, Q53 is turned on.or KRA107SQ54 DTC144EK or UN2213 While Q54's base becomes Hi, Q55 is turned on.or KRC104S COM+B SWQ55 DTA124EK or UN2112 Works during POWER ON mode.or KRA103S2SA2057 or 2SB1548Q56 (P) or 2SB1565(E,F) While Q57's base becomes Hi, Q56 is turned on.or 2SB1655(E,F) COM+B AVRQ57 2SC2412K or Q56 and Q57 is inverted Darlington connection.2SD601AQ58 DTC144EK or UN2213 While Q58's base becomes Hi, Q59 is turned on.or KRC104S Illumination +B SWQ59 DTA124EK or UN2112 Works during POWER ON mode with a panel attachedor KRA103S to the set.2SA2057 or 2SB1548Q60 (P) or 2SB1565(E,F) While Q61's base becomes Hi, Q60 is turned on.or 2SB1655(E,F) Illumination +B driverQ61 2SC2412K or Q60 and Q61 is inverted Darlington connection.2SD601ADTC124EK or UN2212 When BACK-UP detection SW or CHANGER RESET SW orQ150 or KRC103S Electric volume mute SW MI-COM.'s mute works, a base becomes Hi, and Q150is turned on.Q151 DTC114YK or UN2214 SVR discharge SW When POWER IC RESET is activated, a base becomes Hi,or KRC107S Q151 is turned on.DTA124EK or UN2112 When BACK-UP detection SW or CHANGER RESET SW orQ153 or KRA103S Pre-out mute driver MI-COM.'s mute works, a base becomes Lo, and Q153is turned on.Q200 DTC124EK or UN2212 Q201 is turned on when Q200's base becomes Hi.or KRC103S FM +B SWQ201 2SB1277(Q,R) Works during FM reception mode.Q202 DTC124EK or UN2212 Q203 is turned on when Q202's base becomes Hi.or KRC103S AM +B SWQ203 2SB1277(Q,R) Works during AM reception mode.¶SWITCH UNIT(X16-1490-XX)Ref.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 LC75853NE LCD driver with key-matrixQ1 DTA114EK or UN2111 Key-matrix permission SW Ready on key-matrixor KRA102S¶SYNTHESIZER UNIT(X14-6850-XX)