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1st Edition

EDUCATIONAL AMPLIFIER

EA-80

SERVICE MANUAL

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Summary of Contents for EA-80

Page 1: ...1st Edition EDUCATIONAL AMPLIFIER EA 80 SERVICE MANUAL ...

Page 2: ...u son emploi pour tout autre but que des opérations ou entretiens de l équipement à moins d une permission écrite de Sony Corporation Das in dieser Anleitung enthaltene Material besteht aus informationen die Eigentum der Sony Corporation sind und ausschließlich zum Gebrauch durch den Käufer der in dieser Anleitung beschriebenen Ausrüstung bestimmt sind Die Sony Corporation untersagt ausdrücklich d...

Page 3: ...ation Circuit Check by an Oscilloscope 2 4 2 4 3 Indicators Audio and Communication Circuits Check by EA 80 Connected to LLC 8000 2 4 2 5 NOTES ON REPAIR PARTS 2 5 2 5 1 Notes on Repair Parts 2 5 2 5 2 Replacement of Chip Parts 2 5 3 SPARE PARTS 3 1 NOTES ON REPAIR PARTS 3 1 3 2 EXPLODED VIEW 3 2 3 3 ELECTRICAL PARTS LIST 3 3 3 4 SUPPLIED ACCESSORIES 3 4 4 SEMICONDUCTOR PIN ASSIGNMENTS DIODE 4 1 T...

Page 4: ...to blink you can start responding 2 Press the RESPONSE button 1 to 5 that corresponds to what you think is the correct answer Only the RESPONSE indicator corresponding to the pressed button keeps blinking and remaining RESPONSE indicators go off To change your answer Press another button The blinking RESPONSE indicator goes off and the RESPONSE indicator corresponding to the button just pressed st...

Page 5: ...PRINTED CIRCUIT BOARDS 1 2 1 SW 952 BOARD Switch CPU 2 AU 254 BOARD Audio 2 2 NOTE ON INSTALLING COVER When installing the cover put the harness in the notch of the AU 254 board so that the cover does not catch the harness Cover AU 254 Board Harness Notch ...

Page 6: ...SIG 7 15V 15 V D C Power Input 8 INCOM 10 dB Input 0 dB 0 775 Vrms CN3 AU 254 Board Pin No Signal name Function Specification Input Output 1 AUX L IN 10 dB Input 2 AUX R IN 10 dB Input 3 A GND GND for Audio 4 PGM OUT 10 dB Output 5 MIC OUT 10 dB Output 6 A GND GND for Audio 0 dB 0 775 Vrms 6 1 ILG Connector 6P TOP VIEW G 7 1 2 CN1 15 V Power Supply 1 Connecting a power supply to EA 80 short pin 1 ...

Page 7: ...s later all response indicators D1 through D6 on the SW 952 board flash 6 Release the SW1 SW3 SW5 and SW6 7 a Switches and indicators check Every pressing the following switches turn the indicator shown in the table to on and off Switch Indicator Reference No Display Reference No Display SW1 1 D1 1 SW2 2 D2 2 SW3 3 D3 3 SW4 4 D4 4 SW5 5 D5 5 SW6 CALL D6 CALL ATTENDANCE ATTENDANCE b Audio circuit c...

Page 8: ... same step as step 7 a in 2 4 1 Switch Indicators and Audio Circuit Check b Audio circuit check Perform the same step as step 7 b in 2 4 1 Switch Indicators and Audio Circuit Check c Communication circuit check Using an oscilloscope confirm that 55H code is transmitted to the pin 4 of CN1 With transmitting 55H code to the pin 4 of CN1 it shows the following waveform on the oscilloscope b6 bØ 1 1 0...

Page 9: ...n Replacement of Resistor and Capacitor 1 Place the soldering iron tip onto the chip part and heat it up until the solder is melted When the solder is melted slide the chip part aside 2 Make sure that there is no pattern peeling damage and or bridge around the desoldering position 3 After removing the chip part presolder the area in which the new chip part is to be placed with a thin layer of sold...

Page 10: ...hanges or standardization of genuine parts This manual s exploded views and electrical spare parts list are indicating the part numbers of the standardized genuine parts at present 3 Stock of Parts Parts marked with o SP Supply Code column of the spare parts list are not normally required for routine service work Orders for parts marked with o will be processed but allow for additional delivery ti...

Page 11: ...T 8P 5 1 572 404 11 s SWITCH PUSH 1 KEY 6 1 573 798 11 s JACK MINIATURE DIA 3 5 7 1 958 213 11 o HARNESS SUB 1 8 3 165 013 11 o KEY S TOP 9 3 747 922 21 s KNOB 10 4 937 336 32 o HOLDER LED h 4 mm for D1 through D5 11 4 937 336 91 o HOLDER LED h 6 mm for D6 12 8 719 064 85 s DIODE TLOU114 13 8 759 495 61 o IC TMP90PH EA80V100 3 2 EXPLODED VIEW 1 4 6 3 7 2 8 5 13 5 11 10 9 12 8 PS 3x6 PS 3x6 PTP3x8 ...

Page 12: ... C19 1 164 346 11 s CERAMIC 1uF 16V R30 1 216 049 91 s METAL CHIP 1k 5 1 10W C20 1 164 346 11 s CERAMIC 1uF 16V R31 1 216 049 91 s METAL CHIP 1k 5 1 10W C21 1 126 786 11 s ELECT 47uF 20 16V R32 1 216 101 00 s METAL CHIP 150k 5 1 10W C22 1 163 038 91 s CERAMIC 0 1uF 25V R33 1 216 101 00 s METAL CHIP 150k 5 1 10W C23 1 163 038 91 s CERAMIC 0 1uF 25V R34 1 216 101 00 s METAL CHIP 150k 5 1 10W C24 1 1...

Page 13: ... 1 216 073 00 s METAL CHIP 10k 5 1 10W R3 1 216 073 00 s METAL CHIP 10k 5 1 10W R4 1 216 073 00 s METAL CHIP 10k 5 1 10W R5 1 216 073 00 s METAL CHIP 10k 5 1 10W R6 1 216 073 00 s METAL CHIP 10k 5 1 10W R7 1 216 057 00 s METAL CHIP 2 2k 5 1 10W R8 1 216 057 00 s METAL CHIP 2 2k 5 1 10W R9 1 216 057 00 s METAL CHIP 2 2k 5 1 10W R10 1 216 057 00 s METAL CHIP 2 2k 5 1 10W R11 1 216 057 00 s METAL CHI...

Page 14: ...43EKA T146 R1 4 7 K R2 4 7 K RB425D RB425D T146 RD3 6SB RD3 6SB T1 RD5 1ES B2 RD5 1ESB TLOU114 ORANGE IC 1 2 3 4 8 7 6 5 VEE VCC TYPE VCC 2 to 16V 2 to 18V 3 to 20V 5 to 12V 5 to 22 5V 2 5 to 18V 1 to 3 5V 2 to 20V 5 to 16V 062 072 082 4556A M5218 BA15218 33178 34182 TYPES 4580 TYPE 5532 TYPE CXA1297 TYPE M5219 M5220 TYPES MC33077DR2 NJM2100 TYPE OP 297 TYPE OTHERS VEE _2 to _16V _2 to _18V _3 to ...

Page 15: ...10 23 7 9 8 6 1 2 3 NMI EA RESET VCC 5 V INPUT OUTPUT INPUT P00 P07 D0 D7 P10 P17 A0 A7 P20 P27 A8 A15 PROGRAM MEMORY DATA PORT 0 PROGRAM MEMORY ADDRESS PORT 1 PROGRAM MEMORY ADDRESS PORT 2 EA EXTERNAL ACCESS NMI NON MASCABLE INTERRUPT RESET RESET X1 CRYSTAL OSC 1 P31 RXD PORT31 SERIAL RECEIVE DATA P80 INT0 PORT80 INTERRUPT 0 P81 INT1 TI2 PORT81 INTERRUPT 1 TIMER 2 OUTPUT CLK CLOCK P32 SCLK PORT32...

Page 16: ...ol knob RV1 on the SW 952 board adjusts a sound level from 8 dB to 8 dB The RV1 cannot control AUX L IN and AUX R IN signals OUTPUT HS PHONE L HS PHONE R MONI PGM MIC INPUT LEVEL PGM 10 dB 19 dB 19 dB X 10 dB X Turning Q1 on makes sound mute INCOM 10 dB 19 dB 19 dB X X X HS MIC 54 dB 19 dB 19 dB 10 dB X 10 dB Turning Q2 on makes sound mute AUX L 10 dB 19 dB X 16 dB X X AUX R 10 dB X 19 dB 16 dB X ...

Page 17: ...952 A SIDE 1 667 870 11 12 SW 952 B SIDE 1 667 870 11 12 SECTION 6 BOARD LAYOUTS AND SCHEMATIC DIAGRAM B SIDE CNI1 B1 D1 A2 D2 A2 D3 B2 D4 C2 D5 C2 D6 A1 D7 A1 IC1 B1 RV1 C1 SW1 A2 SW2 A2 SW3 B2 SW4 C2 SW5 C2 SW6 A1 X1 A2 ...

Page 18: ... 25V 20k 0 1 3 9k 27k 150k 9 83MHz 10k 10k 10k 10k 10k 1 8k 2 2k 2 2k 2 2k 2 2k 2 2k 470 2 2k 2 2k 1 2k 10k RB425D T146 NJM4560M TE2 47 16V 47 16V 47 16V 33p 33p 0 1 1 NM NM NM 10 16V 10 16V NJM4560M TE2 10k 220k 220k 220k 10k 220k 68 68 100 68 RD5 1ESB 47 16V 1k 470p 470p 470p 470p 270 1 2W 5V 5V 7 5V 7 5V 1 2 3 1 3 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 3...

Page 19: ... 1 DTC143EKA T146 DTC143EKA T146 NJM4560M TE2 100p 1 1 1 1 47 16V 33p 0 1 10 16V 47 16V 47 16V 47 16V 0 1 0 1 150k 150k 150k 1 RD3 6SB T1 RD3 6SB T1 NM NM NM NM NM NM NM NM NM NM NM NM 150k 1k 1k 220k 22k 220k 22k 220k 220k 150k 10k 68k 150k 150k 68k 150k 68 150k 150k 1k 1k NJM4560M TE2 1k 150k 220 NJM4560M TE2 10k 2 2k 22k 22k 22k 1 100p 1 220 470p 470p 470p 470p 470p 470p 7 5V 7 5V 7 5V 7 5V 7 5...

Page 20: ...6 4 EA 80 AU 254 EA 80 SY S N 50001 and higher AU 254 A SIDE 1 667 869 12 AU 254 B SIDE 1 667 869 12 B SIDE CN1 A2 CN2 B4 CN3 E2 D1 A4 D2 B3 D3 B3 IC1 B2 IC2 C4 IC3 D4 J1 C2 J2 D2 Q1 B3 Q2 B3 ...

Page 21: ...6 5 EA 80 AU 254 AU 254 A SIDE 1 667 869 11 AU 254 B SIDE 1 667 869 11 EA 80 E S N 40001 through 41500 B SIDE CN1 A2 CN2 B4 CN3 E2 D1 A4 D2 B3 D3 B3 IC1 B2 IC2 C4 IC3 D4 J1 C2 J2 D2 Q1 B3 Q2 B3 ...

Page 22: ...Sony Corporation Image Sound Communication Company EA 80 E SY 9 955 136 01 Printed in Japan 1997 11 04 1997 Published by Engineering Services Dept ...

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