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Technics SA-EH780E Service Manual

Tuner/amplifier
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AD0202025C2
Tuner/Amplifier
SA-EH780E / SA-EH780EB / SA-EH780EE / SA-EH780EG / SA
-EH780EP
Colour
(N)...................Gold Type
SPECIFICATIONS
2002 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
1

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Summary of Contents for Technics SA-EH780E

  • Page 1 AD0202025C2 Tuner/Amplifier SA-EH780E / SA-EH780EB / SA-EH780EE / SA-EH780EG / SA -EH780EP Colour (N)....Gold Type SPECIFICATIONS 2002 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
  • Page 2 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. 2. Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make sure that the consumed current at 50 Hz in NO SIGNAL mode should be shown below with respectto supply...
  • Page 3 - AC power supply cord for SA-EH780E, SA-EH780EE, / SA- EH780EG, SA-EH780EP / (RJA0019-2X)........1 pc. - AC power supply cord for SA-EH780EB / (RJA0053- 3X)........1 pc. - AM loop antenna set / (RSA0022-L)........1 pc. - FM indoor antenna / (RSA0007)........1 pc.
  • Page 4 - Remote control batteries / (R6/LR6, “AA”, UM-3)....2 pcs. Note: These are available on sales route. - Antenna plug adaptor for SA-EH780EB only / (SJP9009)........1 pc. 4. Caution for AC Mains Lead...
  • Page 5 5. Location of Controls 6. 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 6 described only when required. 6.1. Checking for the AC IN P.C.B. - Check the AC IN P.C.B. as shown below. 6.2. Checking for the operation P.C.B. - Follow the (Step 1) - (Step 3) of item 6.1.
  • Page 7 - Check the operation P.C.B. as shown below. 6.3. Checking for the main P.C.B. - Follow the (Step 1) - (Step 3) of item 6.1. - Follow the (Step 1) - (Step 6) of item 6.2.
  • Page 9 - Check the main P.C.B. as shown below. 6.4. Replacement for the regulator transistor - Follow the (Step 1) - (Step 3) of item 6.1.
  • Page 10 6.5. Replacement for the power IC - Follow the (Step 1) - (Step 3) of item 6.1. - Follow the (Step 1) - (Step 6) of item 6.2. - Follow the (Step 1) - (Step 11) of item 6.3. 7. To Supply Power Source This unit is designed to operate on power supplied from system connected.
  • Page 11 When the unit 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. 7-2. 2. Connect this unit to an AC power supply cord. / (This unit come to stand-by mode.) 3.
  • Page 12 automatically displays a code indicating the nature of the malfunction. Use this self-diagnostic function when servicing the unit. 8.1. To display the malfunction code U70 CD: / U70 DECK: Automatically displays on the tuner/amplifier when a malfunction occurs. Refer to Fig.
  • Page 13 and the power will automatically switch off. 8.3. Display contents 8.3.1. U70 CD/U70 DECK / (displayed automatically) - Problem or condition A bus-line communications error has occurred as a result of the flat cables being inserted incorrectly, thus preventing the system from operating.
  • Page 14 RS-DV280: IC701 (M38503M2406F) Check these ICs and replace. 8.3.2. F61 - Problem or condition 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-EH780) output IC (IC601). (When a DC voltage is applied to speaker terminals.) 9.
  • Page 15 S910: Tuning down switch (TUNING, S911: Tuning up switch (TUNING, S912: Tuner/band switch (TUNER/BAND) S913: Digital super woofer switch / (DIGITAL S.WOOFER) 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...
  • Page 16 : Positive voltage line : Negative voltage line : AM signal line : AM OSC signal line : FM signal line : FM OSC signal line : Audio signal line Caution! IC and LSI are sensitive to static electricity. Secondary trouble can be prevented by taking care during repair. Cover the parts boxes made of plastics with aluminum foil.
  • Page 17 15.1. IC901 (C2BBFD000317): / System Control/FL Drive Terminal Function Name CHECK Clock check signal input 2 LC72 DO O PLL data signal output for tuner unit (Z120) 3 LC72 CE O Chip enable signal output for tuner unit (Z120) 4 LC72 DI/ IF count data/stereo detect signal input from tuner unit (Z120)
  • Page 18 Terminal Function Name 29 REMO / Remote control signal input Grid signal output Segment signal output Power supply terminal Segment signal output Power supply terminal (Negative) Segment signal output Power supply terminal Segment signal output 79 REGIN0 Not used, connected to GND 80 REGIN1 81 STANDBY O LED (STANDBY) drive signal output...
  • Page 19 Terminal Function Name 91 MUTE2 O Muting signal output Not used, open 93 MUTE3 O Muting signal output SH CS I/O Chip select signal input/output for Sound Processor SH DO O Serial communication signal to Sound Processor (Data signal output) SH DI Serial communication signal to Sound Processor (Data signal...
  • Page 20 (E): SA-EH780E (EB): SA-EH780EB (EE): SA-EH780EE (EG): SA-EH780EG (EP): SA-EH780EP - The marking [RTL] indicates the retention time is limited for this item. After the discontinuation of this assembly in production, it will no longer be available. - All parts are supplied by MESA.
  • Page 21 Ref. No. Part No. Part Name & Description Remarks RQT6300-E OPERATING INSTRUCTIONS <IA>(E) RQT6301-B OPERATING INSTRUCTIONS <IB> / (EB,EP,EE) RQT6299-D OPERATING INSTRUCTIONS <IC>(EG) RQT6302-R OPERATING INSTRUCTIONS <ID>(EP,EE) RSA0007 FM INDOOR ANTENNA N1EAYY000002 RSA0022-L AM LOOP ANTENNA N1DAEYA00008 C151 ECA1CAK100XB 16V 10U C152 ECBT1H331KB5 50V 330P...
  • Page 22 Ref. No. Part No. Part Name & Description Remarks C714 ECBA1H102KB5 50V 1000P C715 ECA1EAM472XE 25V 4700U C717 ECA1CAK330XB 16V 33U C718 ECA1EAM101XB 25V 100U C719,20 ECBT1H473KB5 50V 0.047U F1D1H473A012 C721 RCE1AKA101BG 10V 100U F2A1A1010020 C722 ECA1EAM101XB 25V 100U C723,24 ECBT1H473KB5 50V 0.047U F1D1H473A012...
  • Page 23 Ref. No. Part No. Part Name & Description Remarks D151 MA4051M DIODE MAZ40510M D201 MA4056-M DIODE MAZ40560M D306 SELS5223C B3AAA0000486 D500 MA165 DIODE MA2C165 D551,52 MA165 DIODE MA2C165 D553 MA700 DIODE MA2C700 D554 MA165 DIODE MA2C165 D555 MA4100M DIODE MAZ41000MF D558 MA165 DIODE...
  • Page 24 IC601 RSN311W64B...
  • Page 25 Ref. No. Part No. Part Name & Description Remarks IC901 C2BBFD000317 JK551 SJT3213 CONNECTOR(2P) K1KA02A00008 JK601,02 K4BC04B00028 JK,SPEAKERS JK603 K2HA103B0015 JK,SPEAKERS JK701 SJS9236-1 JK,AC INLET / K2AA2B000002 JK903 RJJ37TN02-C JK,HEADPHONES K2HC103A0009 L151,52 ELEXT101KA9 COIL L153 RLQA1R0JT1-Y COIL G0C1R0JA0019 L601-06 RLQYR73MW1-0 COIL G0ZZ00001606 L701...
  • Page 26 Q711 2SB1548PQAU TRANSISTOR 2SB15480J1AU...
  • Page 27 Ref. No. Part No. Part Name & Description Remarks Q723 2SC3940AQSTA TRANSISTOR 2SC3940ARA Q725 2SC5398RSTA TRANSISTOR B1AACF000059 Q726 2SC3940AQSTA TRANSISTOR 2SC3940ARA Q791 2SD2144S TRANSISTOR B1AAGC000006 Q901 UN4212TA TRANSISTOR UNR421200A Q902 UN411FTA TRANSISTOR UNR411F00A R151,52 ERDS2FJ102 1/4W 1K R153,54 ERDS2FJ104 1/4W 100K ERDS2TJ104T R155 ERDS2FJ121...
  • Page 28 Ref. No. Part No. Part Name & Description Remarks R645,46 ERDS2FJ100 1/4W 10 R647 ERDS2FJ391 1/4W 3.9K ERD25FVJ391T R648 ERD2FCG121 1/4W 120 R649-52 ERDS1FJ100 1/2W 10 ERDS1FVJ100T R683-86 ERDS2FJ102 1/4W 1K R687,88 ERDS2FJ152 1/4W 1.5K R691 ERDS1FJ151 1/2W 150 ERDS1FVJ151T R692,93 ERDS2FJ102 1/4W 1K...
  • Page 29 Ref. No. Part No. Part Name & Description Remarks R914 ERDS2FJ102 1/4W 1K R915 ERDS2FJ122 1/4W 1.2K ERDS2TJ122T R916 ERDS2FJ152 1/4W 1.5K R918 ERDS2FJ103 1/4W 10K R919 ERDS2FJ153 1/4W 15K ERDS2TJ153T R921,22 ERDS2FJ103 1/4W 10K R924,25 ERDS2FJ102 1/4W 1K R926 ERDS2FJ222 1/4W 2.2K ERDS2TJ222T...
  • Page 30 Ref. No. Part No. Part Name & Description Remarks X901 EF0EC6004T4 OSCILLATOR EFOEC6004T4 X902 RSXD32K7S02 OSCILLATOR H0A327200027 Z120 RAN0005EM-2 TUNER UNIT Z701 ENC471D5A / J0LG00000008 Z901 B3RAD0000028 REMOTE SENSOR 17. Cabinet Parts Location...
  • Page 31 18. Packaging 19. Schematic Diagram for printing with letter size F020200000YM/KH...
  • Page 32 SCHEMATIC DIAGRAM-2 : NEGATIVE VOLTAGE LINE : FM SIGNAL LINE MAIN CIRCUIT OPERATION CIRCUIT : POSITIVE VOLTAGE LINE : AM SIGNAL LINE :AUDIO SIGNAL LINE 7.6V -10.4V W501 TUNER Lch/C TUNER Rch R511 R509 R597 C659 R631 A.GND 2.2K 16V10 3.9K Lch IN R512...
  • Page 33 SCHEMATIC DIAGRAM-3 : POSITIVE VOLTAGE LINE FAN MOTOR MAIN CIRCUIT : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE 7.6V 7.6V -10.4V Q556 JK551 IC601 2SC5398RSTA RSN311W64B SWITCHING R566 POWER AMP 4.7V 0.5V FAN ON:0V FAN ON:0V R568 C556 R570 0.5V 16V10 2.2M Q557 C552...
  • Page 34 SCHEMATIC DIAGRAM-4 : POSITIVE VOLTAGE LINE AC IN CIRCUIT MAIN CIRCUIT : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE CN601 L605 SPEAKERS JK603 R649 JK601 C OUT CENTER(8 ) C OUT L604 HF(6 L602 R644 SPEAKERS R ch R640 SUR L IN L603 SUR L IN SURROUND(8 )
  • Page 35 SCHEMATIC DIAGRAM-5 :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 10P ~ 270K ~ 6 ~ 220 270K ~ 680K 680K RF AMP 1000P 2SC2413 2SC2413 FM ANT...
  • Page 36 SCHEMATIC DIAGRAM-1 NOTE: The number which noted at the connectors on the schematic diagram as "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 53 54 R996...
  • Page 37 HEMATIC DIAGRAM-2" : POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE -30.1V A B C D E F G H I J K L M N O P Q R S T U V W X 5.1V Q901 UN4212TA RESET -30.1V...
  • Page 38 SCHEMATIC DIAGRAM-2 : NEGATIVE VOLTAGE LINE : FM SIGNAL LINE OPERATION CIRCUIT : POSITIVE VOLTAGE LINE : AM SIGNAL LINE :AUDIO SIGNAL LINE TUNER Lch/ TUNER Rc A.GN Lch I +B(10V R941 5.1V SOUND VR901 EVQVBXFK124B PROCESSOR -B(-10V Z901 (VOLUME) (SH-EH780) B3RAD0000028 Q902...
  • Page 39 MAIN CIRCUIT LINE 7.6V -10.4V W501 TUNER Lch/C TUNER Rch R511 R509 R597 C659 R631 A.GND 2.2K 16V10 3.9K Lch IN R512 47 R510 Rch IN C660 R632 +B(10V) R598 10.4V 16V10 3.9K 2.2K SUR L C202 SUR R SOUND PROCESSOR -B(-10V) -10.4V...
  • Page 40 SCHEMATIC DIAGRAM-3 : POSITIVE VOLTAGE LINE MAIN CIRCUIT : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE 7.6V -10.4V IC601 RSN311W64B POWER AMP -51.4V 54.1V -29.7V 29.4V -0.2V -29.3V 28.9V -59.5V 59.5V C648 1000P R612 R620 C610 120K R611 C609 R619 120K R610 150K C612...
  • Page 41 FAN MOTOR 7.6V Q556 JK551 2SC5398RSTA SWITCHING R566 4.7V 0.5V FAN ON:0V FAN ON:0V R568 C556 0.5V R570 16V10 2.2M Q557 C552 R559 7.6V 2SA1995RSTA 0.01 4.7K -10.4V MOTOR DRIVE -10.4V -10.4V R558 0.3V R591 Q555 2.2K 4.7K 2SD2144STA Q551 Q554 SIGNAL LEVEL DET.
  • Page 42 SCHEMATIC DIAGRAM-4 : POSITIVE VOLTAGE LINE MAIN CIRCUIT : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE L605 SPEAKERS R649 JK601 C OUT C OUT HF(6 L602 R640 SUR L IN SUR L IN LF(8 SUR R IN SUR R IN L606 R650 JK602 HF(6...
  • Page 43 AC IN CIRCUIT CN601 JK603 C OUT CENTER(8 ) C OUT L604 R644 SPEAKERS R ch SUR L IN L603 SUR L IN SURROUND(8 ) SUR R IN R643 SUR R IN L ch R795 3.9K CN602 R712 2.2K SH SYNC SA SYNC D.GND Q726...
  • Page 44 SCHEMATIC DIAGRAM-5 :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 45 GNAL LINE C SIGNAL LINE 10P ~ 270K ~ 270K ~ 680K 680K 1000P 2SC2413 2SC2413 FM IF AMP FM IF AMP DTA114 POWER SUPPLY (FM:ON) LA1833MN FM/AM IF AMP, DET/AM OSC,MIX/FM MPX 3.3K 0.47 2.7K 2SC2712 SWITCHING MAIN CIRCUIT(CP101) on SCHEMATIC DIAGRAM-2/19-A,B SA-EH780(E,EB,EE,EG,EP) TUNER UNIT CIRCUIT DIAGRAM...
  • Page 46 BU4053BCFE2 C2BBFD000317 RSN311W64B UN411FTA 2SB1417PQTA 2SD2144STA C1BB00000527 UN4211TA 2SD2137PQTA UN4212TA ....... 2SA1995RSTA 2SC3940AQSTA 2SB1548PQAU...
  • Page 47 To SOUND PROCESSOR SPEAKERS JK551 Z120 CP601 TUNER UNIT CP101 FAN MOTOR MAIN P.C.B. CP602 ..W501 ..W722A ..W901A .
  • Page 49 Z120 TUNER UNIT (RAN0005EM-2) FM ANT AM ANT +B(FM) Q607 (Q608) RF AMP MIXER COIL COIL W501 MUTING +B(FM) FM IF TUNER L/C FM / AM I F AMP, +B(FM) BUFFER DET / AM OSC, FM OSC MIX / FM MPX TUNER Rch (LA1833MN) A.GND...
  • Page 50 PHONES R ch RSN311W64B IC601 Q609 POWER AMP (18) (Q610) MUTING Q606 MUTING D974 D601 POWER CONTROL CIRCUIT (25) SURROUND Ω C1BB00000527 IC151 RDS SIGNAL DEMODULATOR CENTER Ω 3,11 SPEAKERS Q612 VREF FLOUT (12) VDDA/D MUTING CLOCK CONT. RECOVERY REFERENCE (57kHz) Ω...
  • Page 51 Q702,705 REGULATOR T701 /STABILIZER D702,704, 752,754,755 D701,703, 751,753,761 Q703,704 REGULATOR Q723 NOTES : SIGNAL LINE L701 : FM SIGNAL REGULATOR : AM SIGNAL Q701 AC IN : FM OSC SIGNAL REGULATOR RL702 : AM OSC SIGNAL : AUDIO SIGNAL Z701 ) indicates pin No.
  • Page 52 Note: This printed circuit board diagram may be modified at any time with the development of new technology. MAIN P.C.B. OPERATION P.C.B. Q723 C740 D737 VR901 (VOLUME) W902A CP101 W902B CN781 Q609 R693 E C B R692 W501 S913 E C B R597 DIGITAL Q557...
  • Page 53 Note: This printed circuit board diagram may be modified at any time with the development of new technology. POWER TRANSFORMER (A) P.C.B. POWER TRANSFORMER (B) P.C.B. T701(Power transformer) CN701 AC IN P.C.B. CN702 CN711 R794 R795 R793 Q791 D740 E C B CN703 RL702 T702(Power transformer)
  • Page 54 SCHEMATIC DIAGRAM-1 NOTE: The number which noted at the connectors on the schematic diagram as "SCHEMATIC DIAGRAM-1" or "SCHEMATIC DIAGRAM-2" OPERATION CIRCUIT : POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE :AUDIO SIGNAL LINE indicates the schematic diagram serial number located on the left corner in the schematic diagram. -30.1V FL901 (A2BB00000084) FL DISPLAY...

This manual is also suitable for:

Sa-eh780ebSa-eh780eeSa-eh780egSa-eh780ep