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Pioneer GR-408 Service Manual

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GRAPHIC EQUALIZER

GR-408
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model
Type
GR-408
KUCXCN
PIONEER ELECTRONIC CORPORATION
PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
c
PIONEER ELECTRONIC CORPORATION 1998
Power Requirement
AC120V
CONTENTS
1. SAFETY INFORMATION ...................................... 2
3. SCHEMATIC DIAGRAM ....................................... 6
4. PCB CONNECTION DIAGRAM ............................ 8
5. PCB PARTS LIST ............................................... 10
6. ADJUSTMENT .................................................... 10
7. GENERAL INFORMATION ................................ 11
7.1 IC .................................................................. 11
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
ORDER NO.
RRV2059
Remarks
T - IZK DEC. 1998 Printed in Japan

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  Summary of Contents for Pioneer GR-408

  • Page 1: Table Of Contents

    PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 PIONEER ELECTRONIC CORPORATION 1998 T –...
  • Page 2: Safety Information

    The use of a substitute replacement component which does Leakage 0.5mA current Device not have the same safety characteristics as the PIONEER tester under recommended replacement one, shown in the parts list in test this Service Manual, may create shock, fire, or other hazards.
  • Page 3: Exploded Views And Parts List

    GR-408 2. EXPLODED VIEWS AND PARTS LIST • NOTES: Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List. • mark found on some component parts indicates the importance of the safety factor of the part.
  • Page 4 GR-408 2.2 EXTERIOR SECTION...
  • Page 5 GR-408 • EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Front Cabinet 10104080-001 EQ Bracket 12904082-010 EQ Knob(Black) 12704082-010 Power Button 12804080-010 EQ On/Off Button 12804080-110 Post 13004082-000 Rear Panel 18004085-101 Bottom Cabinet • • • • • Bonnet Cover...
  • Page 6: Schematic Diagram

    GR-408 3. SCHEMATIC DIAGRAM 3.1 MAIN BOARD ASSY POWER SUPPLY 820/1W AC-2 250V/630mA AC CORD UL 02360040-006 01804083-520 AC-1 820/1W 0.22µ/500V IC1B POWER OFF/ON LA6458S (LINE OUTPUT MUTE) EQUALIZER OFF / ON POWER PCB 6.8k SW2 : EQUALIZER OFF/ON SW3 : POWER OFF/ON...
  • Page 7 GR-408 Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST". EQ PCB GRAPHIC EQUALIZER EQ ON/OFF PCB OUTPUT GRAPHIC EQUALIZER OUTPUT 6.8k GRAPHIC EQUALIZER INPUT IC1B LA6458S INPUT BUFFER AMP.
  • Page 8: Pcb Connection Diagram

    GR-408 4. PCB CONNECTION DIAGRAM 4.1 MAIN BOARD ASSY NOTE FOR PCB DIAGRAMS : 1. Part numbers in PCB diagrams match those in the schematic diagrams. 2. The parts mounted on this PCB include all necessary parts for several destinations.
  • Page 9: Main Board Assy

    GR-408 MAIN BOARD ASSY POWER CORD EQ ON/OFF PCB SIDE A...
  • Page 10: Pcb Parts List

    GR-408 Mark No. Description Part No. Mark No. Description Part No. 5. PCB PARTS LIST • NOTES: Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List. • mark found on some component parts indicates the importance of the safety factor of the part.
  • Page 11: General Information

    GR-408 7. GENERAL INFORMATION 7.1 IC • The information shown in the list is basic information and may not correspond exactly to that shown in the schematic diagrams. M5229P (MAIN BOARD ASSY : IC2, IC3) • Graphic Equalizer • Pin Arrangement IN 1 –Vcc...
  • Page 12 GR-408 LA6458S (MAIN BOARD ASSY : IC1) • Input Buffer Amplifier • Pin Arrangement Vcc VOUT1 VIN-1 VIN+1 VIN+2 VIN-2 VOUT2 • Block Diagram VIN+1 VIN+2 VIN-1 VIN-2 VOUT1 VOUT2...
  • Page 13: Panel Facilities And Specifications

    GR-408 8. PANEL FACILITIES AND SPECIFICATIONS • FRONT PANEL FACILITIES Left channel Right channel Equalizer Equalizer Equalizer ON indicator indicators indicators 1 POWER switch (POWER 3 Equalizer controls OFF / These are equalizer controls for the bands 60 Hz, 150 Hz, When this switch is set to the ON position, power is supplied 400 Hz, 1 kHz, 2.4 kHz, 6 kHz and 15 kHz.
  • Page 14: Specifications

    GR-408 • SPECIFICATIONS Input terminals (Reference input level/Input impedance) Electrical section, miscellaneous INPUT ............150 mV/50 kΩ Power requirements ........AC 120 V, 60 Hz Gain ................-2 dB Power consumption ............6 W Output terminals External dimensions (W x H x D) ..420 x 85 x 214 mm (Reference output level/Output impedance) 16-9/16 x 3-3/8 x 8-7/16 in.