Kenwood-RSG7G-rec-sm 电路图 维修手册.pdf

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1、STEREO INTEGRATED AMPLIFIER/TUNER R-SG7/SG7G SERVICE MANUAL 1999-7/B51-5549-00 (K/K) 2299 70% 604603614611642 640612641613 ? stereo integrated amplifier/tuner phones downup volume control pure input selector N.B./tonepure enter % band auto/mono fi ?turning on/standby SPEAKER (6 16 ) RL SUB WOOFER PR

2、E OUT FM75 FM300GND AM ANTENA SYSTEM CONTROL R L ININ CDAUX REC OUTPLAY OUTREC OUTPLAY OUT TAPEMD SUB panel * (A22-) Front glass (B10-2373-03) Indicator (B12-0368-04) Panel * (A60-) AC cord * (E30-) Lock terminal board (E70-0034-05) Phono jack (E63-1014-05) Phono jack (E63-0136-15) Phono jack (E63-0

3、047-15) Metallic cabinet (A01-3470-11) Lock terminal board (E20-0476-05) Rectangular receptacle (E08-0312-05) AC cord bushing (J42-0083-05) Knob (K29-6741-04) Indicator (B12-0320-04) Knob (K29-6358-14) Escutcheon (B07-2457-03) Knob (K29-7570-03) * Refer to parts list on page 23. R-SG7(K) COVER1,1P(

4、99.10.30 0:17 PM yW 2 RadioFans.CN 收音机爱 好者资料库 R-SG7/SG7G 2 CONTENTS / ACCESSORIES CONTENTS / ACCESSORIES . 2 CIRCUIT DESCRIPTION.3 ADJUSTMENT.7 PC BOARD . 8 SCHEMATIC DIAGRAM . 11 EXPLODED VIEW .22 PARTS LIST.23 SPECIFICATIONS .Back cover Contents FM indoor antenna (1) (T90-0801-15) : M (T90-0809-05

5、) : ET DISPLAY SLEEPTAPE REMOTE CONTROL UNIT RC-SE9 123RANDOM 456CLEAR 789P.MODE O.T.E.0+10EDIT TUNER BAND INPUTN.B.MUTE VOLUME CONTROL MD CDP.CALL Batteries (R6/AA) (2) AM loop antenna stand (1) (J19-3645-05) AM loop antenna (1) (T90-0833-05) Audio cords (2) (E30-0615-05) System control cord (1) (E

6、30-2628-05) AC plug adaptor (1) (E03-0115-05) Battery cover (A09-0356-08) Remote control unit (1) (A70-1154-05) : M . . . . . . . RC-SE9 (A70-1155-05) : TE . . . . . . . RC-SE9(E) Accessories Operation to reset The microcomputer may fall into malfunction (impos- sibility to operate, erroneous displa

7、y, etc.) when the power cord is unplugged while power is ON or due to an external factor. In this case, execute the following procedure to reset the microcomputer and return it to normal condition. R-SG7 Pull the power plug from the receptacle, and then plug it in again while keeping the “on/standby

8、” key pressed. ?Please note that resetting the microcomputer clears the contents stored in it returns it to condition when it left the factory. R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 3 RadioFans.CN 收音机爱 好者资料库 R-SG7/SG7G 3 CIRCUIT DESCRIPTION 1. INITIAL STATE (1) AMP related block POWER .OFF SELECTO

9、R SOURCE .TUNER DISPLAY.SELECTOR N.B.CIRCUIT .OFF A CLASS VOLUME VALUE .1.80 STEP AB CLASS VOLUME VALUE .9 STEP PURE A MODE.NORMAL(AB CLASS) AUTO POWER SAVE.OFF (2) TUNER related block BAND.FM P.CH MEMORY.LAST FREQUENCY LAST P.CH .01ch RDS DATA TABLE MEMORY .NO DATA RECEIVING FREQUENCY .LOWER LIMIT

10、VALUE OF RECEIVING FREQUNCY FM : 87.5MHz AM : 531kHz AUTO/MANUAL.AUTO EON THRUST RECEIVING MODE .OFF (3) TIMER related block CLOCK .STOP(AM12:00) PROGR.WORKIG MODE (OFF) CONTENTS OF PROGRAM .ON=AM12:00 OFF=AM12:00 PLAY MODE=PLAY SELECTOR=TUNER(1ch) REC MODE=TAPE O.T.T.WORKING MODE (OFF) O.T.T.ON TIM

11、E.AM7:00 2. INITIALIZING 2-1 The method of the initializing The system is initialized when the power is turned on while pressing the ON/STANDBY key. (1) Contents of the operation All the functions are initialized. 3. BACK UP This function holds the current state of the unit even if the AC power of t

12、he receiver is turned OFF. (1) Operation outline The backup state set command(CE) of a microcomputer is set low when the AC power is turned OFF. The micro- computer detects the signal and enters the stop state. The microcomputer is reset when the AC power is turned ON. The data for backup state comf

13、irmation is checked by reset processing. The microcomputer is initialized when the data was destroyed. If it is not destroyed, the microcomputer is started in the backup state. The data for backup state comfirmation is written in a RAM area. The microcomputer is set to the stop mode so as to save th

14、e power consumption. A backup state set command signal is detected by a timer interrupt of 1 msec. The backup guarantee period is set in a circuit. (2) Contents of backup data to be held AMP POWER ON/OFF DISPLAY MODE SELECTOR SOURCE N.B.CIRCUIT MODE A CLASS VOLUME VALUE AB CLASS VOLUME VALUE PURE A

15、MODE AUTO POWER SAVE ON/OFF TUNER LAST BAND PRESET CHANNEL/RECEIVING FREQUNCY/PI/TA/ PTY/PS LAST RECEIVING FREQUNCY AND PRESETCHANNEL (AM/FM) PRESET MEMORY DATA(1ch40ch) AUTO/MANUAL EON THRUST RECEIVING FREQUNCY CLOCK/TIMER LAST CLOCK DATA PROGRAMMED CONTENTS/PROGRAM TIMER WORKING MODE ON/OFF O.T.T.

16、 SETTING TIME/WORKING MODE ON/OFF 4. CONDITIONS ACCORDING TO THE DESTINATION 4-1 Destination list of tuner Desti- nation Band Receiving frequency range Channel space IF PLL reference frequency DIODE SW DSW1 DSW2 (D519) (D518) FM87.5MHz50kHz+10.7MHz25kHz E1108.0MHz0 1 AM531kHz9kHz+450kHz9kHz 1602kHz

17、FM87.5MHz50kHz+10.7MHz25kHz E3108.0MHz1 0 (RDS)AM531kHz9kHz+450kHz9kHz 1602kHz ME1 changes by only setting DSW1. (DSW10,E1) X 1 *DIODE SW(DSW) : 0 Without diode(when static, input low) 1With diode(when static, input high) XSwitching transistor R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 6 RadioFans.CN 收

18、音机爱 好者资料库 R-SG7/SG7G 4 CIRCUIT DESCRIPTION 5. TEST MODE 5-1 AMP test mode using main units keys Entering the AMP test mode Turn on the power while pressing theBAND key. Canceling the AMP test mode By turning off the power, the systen is initialized and the test mode is canceled. 5-1-1 Contents of AM

19、P test mode (1) Automatic on/standby ON The POWER ON state is entered when the power is turned on whille pressing the BANDkey. All functions are then initialized and activated in the all-lighting mode. Sub-clock oscillation diagnosis function The oscillation diagnosis (existence of oscillation and m

20、easurement of period) of a sub-clock is performed before the test mode is entered. If the diagnosis result is OK,the system enters the test mode. If the diagnosis result is NG,the oscillation of the sub-clock is diagnosed again. If the result is OK, the system enters the test mode. If the diagnosis

21、result is continuously NG five times, the system stops with ERR1 and ERR2 displayed. (2) All- lighting mode All the fluorescent display indicators and LED lamps light when the power is turned on while pressing the BAND key. After that, all- lighting mode is canceled when any main units key is presse

22、d. The normal display is obtained when the selector is set to TUNER then appears. (3) Others The AMP test mode is not terminated even if the selector is set to positions other than TUNER. In the AMP tesst mode,the muting during mode selection is not controlled. However, the operation during the powe

23、r-on sequence is the same as the normal operation. The SP protection operation is also the same as the nor- mal operation. In the AMP test mode using main units keys,the keys below provide a special operation according to the posi- tion where the selector is set. The main unit keys except described

24、below and the rotary encoder provide the nor- mal operation. (4) When selector is set toTUNER 1 Write data in the unused area of E2PROM, then read the written data. If the read data is the same as the written data, RAM OK is displayed in the fluorescent display indi- cator. If the former is the diff

25、erent from the later, RAM NG is displayed. 2 Set the TUNER ATT to OFF and display the S level in hexadecimal when the ENTER key is pressed . (ATT OFF 8 8 is displayed in the fluorescent display indicator.) 3 Set the TUNER ATT to ON and the display S level in hexadecimal when the ENTER key is pressed

26、. (ATT ON 8 8 is displayed in the fluorescent display indicator.) * The special display using the ENTER key is continued until the next operation is carried out. ( 8 8 : S LEVEL) When keys other then ENTER are pressed in items 1 to 3 above, the TUNER ATT is set to OFF and the normal display appears.

27、 The operation corresponding to the key that has been pressed performed in this case. (5) When selector is set to positions other than TUNER. 1 ENTER and PURE A keys. The master volume level is selected cyclically, while press- ing the ENTER key. 2 AUTO/MONO key. Selects the mute operation and equal

28、izer cyclically in the order below for operation display every time this key is pressed. *In the operation for except the AUTO key, become pre- condition equalizer. *Pre -condition : The equalizer becomes the condition to be pushed the AUTO key before (include N.B. circuit). 3 ? BAND and tuning UP/D

29、OWN keys. KeysOperation PURE AIncrease the P.CALL every time this key is pressed. N.B./TONEDecrease the P.CALL every time this key is pressed. ENTERSelects the display cyclically in the order below every time this key is pressed. Value of MasterPress the Press the PURE A key, volume.ENTER key. then

30、press the ENTER key. MAX8616.00 MID408.00 MIN10.20 KEYOPERATION AUTO/MONO KEYSOPERATION BANDEvery time this key is pressed, all the displays go off and the normal display is selected cyclically. TUNING UP/DOWN R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 7 R-SG7/SG7G 5 CIRCUIT DESCRIPTION 6. Microprocess

31、or : uPD78045FGF071(X09-IC11) 6-1 Microprocessor periphery block diagram X09,ED1 FL DISPLAY(FIP9GM6R) RESET CE REMOCON KEY MATRIX LEVEL IN CLASS A LED FL GRID43 916 BIAS MIDIC113X05,IC2 BIAS HI PLL IC LOW RELAY (LC72131) HI RELAY1 SPEAKER RELAYuPD78045FGF071X09,IC1 (u-COM)3 SELECTOR ANALOG X09,J4 SW

32、 CONTROL IC SERIAL DATA (NJU7313AM) BUSY X09,IC3 X09,S5162 E.VOL.IC VOLUME (M62421SP) ROTARY ENCODER 2 ENC-A SD ENC-B STEREO HEADPHONES PROTECTION A MUTE T MUTE H.P. MUTE ATT A CLASS ON Key matrix bsignifies pin number of microprocessor. KR0KR1KR2 KS0DSW1(D519)DSW2(D518) KS1POWERAUTO/MONOBAND KS2N.B

33、. CIRCUITINPUT SEL.TUNING UP KS3pure AENTERTUNING DOWN 5960 64 63 62 61 58 R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 10 Pin No.Pin NameI/ODescriptionActive 177G1GOFL grid71. 8VDD-Microprocessor power supply (+5V). 9E2PROM SCLIE2PROM control clock. 10E2PROM SDAI/OE2PROM control data. 11,12NC-Unused. 13

34、A CLASS ONOPOWER ON/OFF control signal.H : ONL : OFF 14SEL STBOStrobe signal of selector IC. 15SEL/PLL/CLKOControl clock of SEL/PLL IC. 16SEL/PLL/DATAOControl data of SEL/PLL IC. 17RESETIReset signal of microprocessor.L : Reset 18CEIDetection signal input for AC OFF. 19PLL DOIPLL IF count data. 20AV

35、ss-A/D power supply(GND). 21PLL CEOChip enable control of PLL IC. L : ON 22T MUTEOOutput terminal of muting signal for TUNER.L : ON 23STEREOIStereo signal input for TUNER.L : Stereo ON 24SDISynchronized signal detection input. 25VOL SCLOControl clock of E. volume IC. 26VOL DATAOControl data of E. vo

36、lume IC.L : CE 27LEVEL INIVolume level input.H : ONL : OFF 28S LEVELISignal level input.(E/T type only) 29A Vdd-A/D power supply(+5V). 30A VREF-A/D reference voltage(+5V). 31CLOCK-32.768kHz oscillator. 32CLOCK-32.768kHz oscillator. 33Vss-Microprocessor power supply(GND). 34MAIN COLCK-4.19MHz oscilla

37、tor. 35MAIN COLCK-4.19MHz oscillator. 36S DATAI/O16 bit system data. 37S BUSYI/O16 bit system busy.H : BUSYL : READY 38H.P. MUTEOMuting signal input of headphones.L : ON 39ATTOAttenuator control.L : ON 40A MUTEOAudio muting signal control.L : ON 41LOW RELAYOAmplifier low relay control.H : ONL : OFF

38、42HI RELAYOAmplifier high relay control.H : ONL : OFF 43SP RELAYOSpeaker relay control. 44,45NCIUnused. 46PROTECTIONIDetection signal input of protection.H : ONL : OFF 47REMOCONIRemote control input. 48IC(VPP)GND-Connected to VSS. 49CLASS A LEDOControl signal output of class A LED. L : ON 50BIAS A M

39、IDOBias control signal(MID) output. 51BIAS B HIOBias control signal(HI) of class A LED. 52Vdd-Microprocessor power supply(+5V). 53ENC AIVolume encoder (A) input. 54ENC BIVolume encoder (B) input. 55HEAD PHONESIDetection signal input of headphones.H : ONL : OFF 56,57-OUnused. 5860KR2KR0IKey return in

40、put(KR2KR0).H : Key ON 6164P1613/KS30OFL segment(613)/key scan(KS3KS0).H : ON 6570P12P7OFL segment(127) control.H : ON 71VLOAD-FL driver power supply(-30V). 7277P6P1OFL segment(61) control.H : ON 78NC-Unused. 79,809G,8GOFL grid(9G,8G) control. 6-2 Pin description R-SG7/SG7G 6 CIRCUIT DESCRIPTION R-S

41、G7(K) COVER1,1P( 99.10.30 0:17 PM yW 11 R-SG7/SG7G 7 ADJUSTMENT NO.ITEM INPUT SETTINGS OUTPUT SETTINGS TUNER SETTINGS ALIGNMENT POINTS ALIGN FORFIG. 1 DISCRIMINATOR (A) 98.0kHz 1kHz, 75kHz dev. 60dB(ANT input) Connect a DC voltmeter between Pin 1 and Pin 2 of CN 2. MONO 98.0MHz L 310V (a) L 32Minimu

42、m distortion. 2 DISTORTION (STEREO) (C) 98.0MHz 1kHz, 68.25kHz dev. Pilot: 6.75kHz dev. 60dB(ANT input) (B) AUTO 98.0MHz IFT (A1)Minimum distortion.(a) NO.ITEM INPUT SETTINGS OUTPUT SETTINGS AMP SETTINGS ALIGNMENT POINTS ALIGN FORFIG. POWER: ON SELECTOR : AUX 1 B CLASS IDLE CURRENT Connect a DC volt

43、meter across CN1(L) CN2(R) (X09, A/7) PURE A : OFF Volume : 0 VR1(L) VR2(R) (X09, A/7) 20mV(b) SPEAKER (6 16 ) RL SUB WOOFER PRE OUT FM75 FM300GND AM ANTENA SYSTEM CONTROL R L ININ CDAUX REC OUTPLAY OUTREC OUTPLAY OUT TAPEMD Oscilloscope Distortion meter AC voltmeter Dummy antenna (A) (B) (C) (D) AG

44、 AG FM SG MPX AG FM SG AM SG (a)(b) CN1(L) CN2(R) Dc voltmeter 20mV FM SECTION SELECTION :FM X05-4882-70 (E/T TYPE) AUDIO SECTION (X09-496x-xx) SYSTEM CONNECTIONS No.ITEMINPUT SETTING OUTPUT SETTING TUNER SETTING ALIGNMENT POINTS ALIGN FORFIG. 1 TUNED LEVEL (A) 98.0MHz MONO 1 kHz, 75 kHz dev. 30dBu

45、10 dB (ANT input) (B) MONO 98.0MHz VR1 Adjust VR1 and stop at the point where EDI (TUNED) goes ON. (a) X05-488X(E/T)/486X(M) R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 14 8 ABDCE 2 1 3 5 7 4 6 Refer to the schematic diagram for the value of resistors and capacitors. PC BOARD (Component side view) TUNER

46、 UNIT (X05-4860-71) : M TUNER UNIT (X05-4882-70) : ET R-SG7(K) COVER1,1P( 99.10.30 0:17 PM yW 15 FHJLNGIKMO 2 1 3 5 7 4 6 R188 C53 C48 C50 C52 C51 C54 C119 C115 C118 C47 C11 C9 C12 C17 C16 C15 C8 C3 C2 C1 C4 C7 C6 C5 C43 C44 C18 R125 R118 R124 R187 R171 R52 R53 C145 C146 W221 R26 R25 W209 C46 R17 R20 R18 R28 R19 R13 R12 W215 R5 R16 R14 R7 C120 R127 R8 R6 R3 R1 R4 R11 C116 C117 W216 R27 C55C56C140 R99 R67 R79 R77 R81 R