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Technics SA-EH670 Service Manual

Tuner/amplifier
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AD0105109C2
Tuner/Amplifier
SA-EH670
Colour
(S)...................Silver Type
Areas
(E)...................Europe.
(EG).................Germany, Italy, France, Netherlands and Denmark.
(EP).................East Europe.
SPECIFICATIONS
1

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Summary of Contents for Technics SA-EH670

  • Page 1 AD0105109C2 Tuner/Amplifier SA-EH670 Colour (S)....Silver Type Areas (E)....Europe. (EG)....Germany, Italy, France, Netherlands and Denmark. (EP)....East Europe. SPECIFICATIONS...

  • Page 2: Before Repairs

    2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. Before Repairs 1. Turn off the power supply. Using a 10 , 10 W resistor, connect both ends of power supply capacitors (C701, C703 and C702, C704) in order to discharge the voltage.
  • Page 3 3. Accessories - AC power supply cord / (RJA0019-1X)........1 pc. - AM loop antenna set / (RSA0022-L)........1 pc. - FM indoor antenna / (RSA0007)........1 pc. - Speaker cords / (REE1057)........2 pcs. - Remote control transmitter / (EUR7702170)......1 pc. - Remote control batteries / (R6/LR6, “AA”, UM-3)....2 pcs. Note: These are available on sales route.
  • Page 4 4. Location of Controls 5. Operation Checks and Component Replacement / Procedures - This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. - For reassembly after operation checks or replacement, reverse the respective procedures.
  • Page 5 - Follow the (Step 1) - (Step 3) of item 5.1. - Check the operation P.C.B. as shown below. 5.3. Checking for the main P.C.B. - Follow the (Step 1) - (Step 3) of item 5.1. - Follow the (Step 1) - (Step 6) of item 5.2.
  • Page 7 - Check the main P.C.B. as shown below. 5.4. Replacement for the regulator transistor - Follow the (Step 1) - (Step 3) of item 5.1.

  • Page 8: To Supply Power Source

    - Follow the (Step 1) - (Step 6) of item 5.2. - Follow the (Step 1) - (Step 10) of item 5.3. 6. To Supply Power Source This unit SA-EH670 is designed to operate on power supplied from system connected. / For system connection, refer to Fig. 6-1.

  • Page 9: Self-Diagnostic Function

    When the unit SA-EH670 has to test and service alone, use the following method to supply power source. 1. Short the section between W902A Pin 3 and C740 (-) (GND). (Refer Fig. 6-2. 2. Connect this unit to an AC power supply cord. / (This unit come to stand-by mode.)
  • Page 10 This unit is equipped with a self-diagnostic function which, in the event of a malfunction, automatically displays a code indicating the nature of the malfunction. Use this self-diagnostic function when servicing the unit. 7.1. To display the malfunction code U70 CD: / U70 DECK: Automatically displays on the tuner/amplifier when a malfunction occurs.
  • Page 11 Make sure the white side of the cables is on your right side. Refer to Fig. 7-3. Fig. 7-2. Fig. 7-3. 2. Breakage of flat cables. (Check and replace.) 3. If the problem is not corrected by items 1 and 2 above, this indicates a faulty IC. SA-EH670: IC901 (C2BBFD000317) SL-EH570:...

  • Page 12: Schematic Diagram Notes

    When the power switch is switched on, it automatically switches back off, making it impossible to switch power on. - Correction procedure Faulty Tuner/Amplifier (SA-EH670) output IC (IC601). (When a DC voltage is applied to speaker terminals.) 8. Schematic Diagram Notes - This schematic diagram may be modified at any time with the development of new technology.
  • Page 13 Tuning down switch (TUNING, S911: Tuning up switch (TUNING, S912: Tuner/band switch (TUNER/BAND) S913: Muting switch (MUTING) S914: RDS display mode PS switch / (RDS DISP MODE-PS) S915: RDS display mode PTY switch / (RDS DISP MODE-PTY) VR901: Volume control VR (VOLUME) - Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the chassis taken as standard.
  • Page 14 Ground the soldering iron. Put a conductive mat on the work table. Do not touch the legs of IC or LSI with the fingers directly. - Voltage and signal line : Positive voltage line : Negative voltage line : AM signal line : AM OSC signal line : FM signal line : FM OSC signal line...
  • Page 15 Terminal Function Name CHECK I Clock check signal input LC72 DI O PLL data signal output for tuner unit (Z120) LC72 CE O Chip enable signal output for tuner unit (Z120) LC72 DI/ I IF count data/stereo detect signal input from tuner unit (Z120) LC72 CK O Clock signal output for tuner unit (Z120)
  • Page 16 Terminal Function Name O Grid signal output O Segment signal output I Power supply terminal O Segment signal output I Power supply terminal (Negative) O Segment signal output I Power supply terminal O Segment signal output 79 REGIN0 - Not used, connected to GND 80 REGIN1 81 STANDBY O LED (STANDBY) drive signal output...

  • Page 17: Replacement Parts List

    Terminal Function Name SH DO O Serial communication signal to Sound Processor (Data signal output) SH DI I Serial communication signal to Sound Processor (Data signal input) SH CK I Serial communication signal to Sound Processor (Clock signal input) E DET I Unusual condition detect signal input - Not used, open...
  • Page 18 GASKET RGW0317-S KNOB,VOLUME RHN90001 RKA0106-N FOOT RING RKF0606Q-K BACK GRILL RKW0581-1V FL WINDOW RMN0427A CABLE HOLDER RYP1046-S FRONT PANEL ASS'Y 12-1 RGB0025-A TECHNICS BADGE SHG1654 RUBBER XTB3+10JFZ SCREW XTB3+8JFZ SCREW XTW3+15T SCREW XTBS3+8JFZ1 SCREW RLBT4001-N FERRITE CORE RMN0582 HOLDER XTB3+12FFZ...
  • Page 19 Ref. No. Part No. Part Name & Description Remarks C160 ECBT1H102KB5 50V 1000P F1D1H102A012 C395,96 ECBT1H473KB5 50V 0.047U C509,10 ECBT1H103KB5 50V 0.01U C550 ECBT1H103KB5 50V 0.01U C551 ECA1HAK2R2XB 50V 2.2U C552 ECBT1H103KB5 50V 0.01U C553 RCE1HKAR47BG 50V 0.47U F2A1HR47A015 C554 ECA1CAM221XB 16V 220U C601,02...
  • Page 20 Ref. No. Part No. Part Name & Description Remarks C753 ECKR1H103ZF5 50V 0.01U F1B1H1030001 C754 ECBT1H103KB5 50V 0.01U C755 ECA1CAM102XB 1000U C758 ECBT1H103KB5 50V 0.01U C759 RCE1AKA470BG 10V 47U F2A1A470A011 C761 ECQE1104KF3 100V 0.1U C791 ECKWRS102MBC 1000P C901 EEAFC0J101B 6.3V 100U C902 RCE1AM102BV 10V 1000U...
  • Page 21 Ref. No. Part No. Part Name & Description Remarks D711 RL1N4003N02 DIODE D717-20 RL1N4003N02 DIODE D721 MA4300M DIODE MAZ43000M / D723 MA4150M DIODE MAZ41500M / D725 MA4082LTA DIODE MAZ40820LF / D730 MA4091H DIODE MAZ40910HF / D737 MA4082LTA DIODE MAZ40820LF / D738-40 MA165 DIODE...
  • Page 22 Ref. No. Part No. Part Name & Description Remarks RPG5521 PACKING CASE / (SYSTEM) (EP) RPQ0951 PAD(SYSTEM) RPG4397 PACKING CASE(RS) RPG4396 PACKING CASE(SA) RPG4398 PACKING CASE(SH) RPG4399 PACKING CASE(SL) RPN1195-2 PAD(RS) RPN1194 PAD(SA) RPN1196 PAD(SH) RPN1203 PAD(SL) RPF0139-1 PROTECTION BAG / (F.B.) SPP740-1 SHEET PCB1...
  • Page 23 Ref. No. Part No. Part Name & Description Remarks R558 ERDS2FJ102 1/4W 1K R559 ERDS2FJ472 1/4W 4.7K R561 ERDS2FJ104 1/4W 100K R563,64 ERDS2FJ272 1/4W 2.7K R570 ERDS2TJ225 1/4W 2.2M ERDS2TJ225T R572 ERDS2FJ153 1/4W 15K R591 ERDS2FJ472 1/4W 4.7K R597,98 ERDS2FJ222 1/4W 2.2K R601,02 ERDS2FJ222...
  • Page 24 Ref. No. Part No. Part Name & Description Remarks R767 ERD2FCJ4R7 R768 ERDS2FJ101 1/4W 100 R769 ERD25V0R00T 1/4W 0 R771 ERDS2FJ222 1/4W 2.2K R772 ERDS2FJ223 1/4W 22K R773,74 ERDS1FJ180 ERDS1FVJ180T / R776 ERDS2FJ103 1/4W 10K R777 ERDS2FJ102 1/4W 1K R791,92 RSFMB40KT-L PROTECTOR K5G402A00010 /...

  • Page 25: Cabinet Parts Location

    Ref. No. Part No. Part Name & Description Remarks R960 ERDS2FJ152 1/4W 1.5K R961,62 ERDS2FJ223 1/4W 22K R965,66 ERDS2FJ392 1/4W 3.9K R969 ERDS2FJ272 1/4W 2.7K R974 ERDS2FJ102 1/4W 1K R975 ERDS2FJ223 1/4W 22K R976 ERDS2FJ104 1/4W 100K R986 ERDS2FJ152 1/4W 1.5K R987,88 ERDS2FJ102 1/4W 1K...
  • Page 26 17. Packaging...
  • Page 27 F010500000YM/KH...
  • Page 28 MAIN P.C.B. Q723 C740 D737 W902A CP101 CN781 Q609 R693 E C B R692 W501 E C B R597 Q610 R598 R558 R605 R606 R617 R618 Q601 W901A Q602 Q554 Q612 C601 E C B C725 C664 R604 R561 C622 D611 R603 R686...
  • Page 29 AC IN P.C.B. R794 R795 Q791 D740 E C B RL702 T702(Power transformer) D500 R773 R774 Q726 E C B C754 C758 C791 R777 CN602 C753 Z701 CN601 L701 C644 C651 C646 C652 JK701 JK603 (REP3116G-S) AC IN CENTER/ (230V 50Hz) SURROUND SPEAKERS POWER TRANSFORMER...

  • Page 30: Schematic Diagram

    NOTE: SCHEMATIC DIAGRAM-1 The number which noted at the connectors on the schematic diagram as :AUDIO SIGNAL LINE "SCHEMATIC DIAGRAM-1" or "SCHEMATIC DIAGRAM-2" OPERATION CIRCUIT indicates the schematic diagram serial number located on the left corner in the schematic diagram. FL901 (A2BB00000084) FL DISPLAY 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50...
  • Page 31 SCHEMATIC DIAGRAM-2 : POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE -30.1V A B C D E F G H I J K L M N O P Q R S T 5.1V Q901 UN4212TA RESET -30.1V -25.6V FM / AM -29.3V 5.1V REMOCON...
  • Page 32 SCHEMATIC DIAGRAM-3 OPERATION CIRCUIT : POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE R941 5.1V VR901 EVQVBXFK124B Z901 (VOLUME) B3RAD0000028 Q902 (REMOTE SENSOR) UN411FTA MUTING CONT. R974 3.3V 3.3V R946 A B C W902B IC151 C1BB00000527 RDS SIGNAL DEMODULATOR C151 16V10...
  • Page 33 SCHEMATIC DIAGRAM-4 : POSITIVE VOLTAGE LINE : FM SIGNAL LINE MAIN CIRCUIT : NEGATIVE VOLTAGE LINE : AM SIGNAL LINE :AUDIO SIGNAL LINE 7.6V -10.4V W501 TUNER Lch/C TUNER Rch R511 R509 R597 C601 R603 A.GND 2.2K 16V10 3.3K Lch IN R512 47 R510 Rch IN...
  • Page 34 SCHEMATIC DIAGRAM-5 : POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE 7.6V -10.4V IC601 RSN309W44B POWER AMP -47.2V 47.2V -29.7V 29.4V -0.2V -29.3V 28.9V -59.5V 59.5V C648 1000P R610 C612 R622 120K R609 R602 C611 R621 150K 2.2K R608 R601 C614...

  • Page 35: Power Supply Circuit

    SCHEMATIC DIAGRAM-6 : POSITIVE VOLTAGE LINE MAIN CIRCUIT : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE 7.6V L601 Q555 2SD2144STA R570 R558 R639 JK601 2.2M SIGNAL LEVEL DET. Q554 Lch(6 C552 R559 7.6V 2SA1995RSTA 0.01 4.7K L602 -10.4V SIGNAL LEVEL DET. SPEAKERS -10.4V R640...
  • Page 36 SCHEMATIC DIAGRAM-7 : POSITIVE VOLTAGE LINE AC IN CIRCUIT : NEGATIVE VOLTAGE LINE C635 L605 0.047 CP601 CN601 R649 JK603 CENTER(8 ) SPEAKERS R ch CP602 CN602 SURROUND(8 ) R712 2.2K L ch Q726 2SC3940AQSTA D746 REGULATOR RL1N4003N02 10.7V R777 6.7V D711 R773...
  • Page 37 SCHEMATIC DIAGRAM-8 :FM SIGNAL LINE :AM SIGNAL LINE Z120 TUNER UNIT(RAN0005EM-2) :POSITIVE VOLTAGE LINE :FM OSC SIGNAL LINE :AM OSC SIGNAL LINE 2SC2059 FM MIXER 2SK360 6 ~ 220 RF AMP FM ANT (75 ) 0 ~ 220 2SK360 FM OSC 2SC2413 BUFFER AMP AM ANT...
  • Page 38 SCHEMATIC DIAGRAM-9 :POSITIVE VOLTAGE LINE :FM SIGNAL LINE :AM SIGNAL LINE :AM OSC SIGNAL LINE 10P ~ 270K ~ 270K ~ 680K 680K 1000P 2SC2413 2SC2413 DTA114 FM IF AMP FM IF AMP POWER SUPPLY (FM:ON) LA1833MN FM/AM IF AMP, DET/AM OSC,MIX/FM MPX 3.3K 0.47...
  • Page 39 C1BB00000527 C2BBFD000317 RSN309W44B UN411FTA 2SB1417PQTA 2SD2144STA UN4211TA UN4212TA ....... 2SA1995RSTA 2SC3940AQSTA 2SB1548PQAU 2SD1859QRTV2...

  • Page 40: Power Supply Pcb

    To SOUND PROCESSOR SPEAKERS Z120 CP601 TUNER MAIN P.C.B. UNIT CP101 CP602 ..W501 ..W722A ..W901A ..
  • Page 41 Tuner/amplifier 1 Standby/on switch ( Í/I) Press to switch the unit from on to standby mode or vice versa. In 2 345 6 standby mode, the unit is still consuming a small amount of power. 2 Standby indicator ( Í) When the unit is connected to the AC mains supply, this indicator lights MUTING VOLUME...
  • Page 42 Z120 TUNER UNIT (RAN0005EM-2) FM ANT AM ANT +B(FM) RF AMP MIXER COIL COIL +B(FM) FM IF FM / AM I F AMP, +B(FM) BUFFER DET / AM OSC, FM OSC MIX / FM MPX (LA1833MN) +B(FM) FM:ON DECODER BUFEER PHASE STEREO PILOT...
  • Page 43 Q607 (Q608) W501 TUNER L/C MUTING TUNER Rch A.GND Lch IN Rch IN +B(10V) SUR L SUR R To SOUND PROCESSOR (SH-EH670) BLOCK DIAGRAM Q902 -B(-10V) MUTING V.GND CONT. D.GND CE/REQ DATA CT.GND SH FL1 From POWER TRANSFORMER SH FL2 SYNC C2BBFD000317 IC901...
  • Page 44 Q609 (Q610) MUTING C1BB00000527 IC151 RDS SIGNAL DEMODULATOR 3,11 VREF FLOUT Q612 VDDA/D MUTING CLOCK CONT. RECOVERY REFERENCE (57kHz) (1187.5kHz) VOLTAGE 4,10 VssA/D VREF 57kHz DATA MPX IN SMOOTHING DATA ANTIALIASING DECODER FILTER FILTER (SCF) CLK(4.332MHz) RDS-ID TEST TEST DETECT/ OSC/DIVIDER MODE XOUT...
  • Page 45 PHONES R ch RSN309W44B IC601 POWER AMP (22) Q671,672 STABILIZER D974 D601 POWER CONTROL CIRCUIT CENTER SURROUND SPEAKERS Q503,D558 SWITCH- POWER CONTROL/ PROTECTION CIRCUIT D907 Q673 D602 D906 STABILIZER Q551,554,555 SIGNAL LEVEL DET. Q601,602 PRO- TECTOR C2BBFD000317 IC901 SYSTEM CONTROL / FL DRIVE Q901, RESET SWITCH...
  • Page 46 Q702,705 REGULATOR T701 /STABILIZER D702,704, 752,754,755 D701,703, 751,753,761 Q710 REGULATOR Q723 AC IN L701 REGULATOR Q701 RL702 Z701 REGULATOR AC IN D717~720 Q711,725 Q791 REGULATOR RELAY /STABILIZER DRIVE Q707 D705 REGULATOR Q708,709 SWITCH- SHSYNC FL DISPLAY (FL901) POWER D740 SASYNC T702 D741~744 Q726...
  • Page 47 OPERATION P.C.B. VR901 (VOLUME) W902B S913 MUTING R918 C902 C915 R932 R956 R957 R919 R987 Q902 D961 D973 W901B POWER SUPPLY P.C.B. C903 FL901 S915 R725 (RDS Q701 C717 DISP MODE R723 R960 R939 PTY) R986 W701B Q705 E C B S914 (RDS Q702...

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