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ORDER NO.
RRV2059
GRAPHIC EQUALIZER
GR-408
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type
KUCXCN
Model GR-408
AC120V
Power Requirement
Remarks
CONTENTS
1. SAFETY INFORMATION ...................................... 2 2. EXPLODED VIEWS AND PARTS LIST ................ 3 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 8. PANEL FACILITIES AND SPECIFICATIONS .... 13 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
c PIONEER ELECTRONIC CORPORATION 1998
T IZK DEC. 1998 Printed in Japan
GR-408
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians ; it is not meant for the casual do-ityourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a qualified service technician.
WARNING This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause cancer, birth defects or other reproductive harm. Health & Safety Code Section 25249.6 Proposition 65
NOTICE (FOR CANADIAN MODEL ONLY) Fuse symbols (fast operating fuse) and/or be of identical designation.
(slow operating fuse) on PCB indicate that replacement parts must
REMARQUE (POUR MODÈLE CANADIEN SEULEMENT) Les symboles de fusible (fusible de type rapide) et/ou de remplacement doivent avoir la même désignation.
(fusible de type lent) sur CCI indiquent que les pièces
(FOR USA MODEL ONLY)
1. SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester such as Simpson Model 229-2 or equivalent between the earth ground and all exposed metal parts of the appliance (input/output terminals, screwheads, metal overlays, control shaft, etc.). Plug the AC line cord of the appliance directly into a 120V AC 60Hz outlet and turn the AC power switch on. Any current measured must not exceed 0.5mA.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance have special safety related characteristics. These are often not evident from visual inspection nor the protection afforded by them necessarily can be obtained by using replacement components rated for voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service Manual. Electrical components having such features are identified by marking with a on the schematics and on the parts list in this Service Manual. The use of a substitute replacement component which does not have the same safety characteristics as the PIONEER recommended replacement one, shown in the parts list in this Service Manual, may create shock, fire, or other hazards. Product Safety is continuously under review and new instructions are issued from time to time. For the latest information, always consult the current PIONEER Service Manual. A subscription to, or additional copies of, PIONEER Service Manual may be obtained at a nominal charge from PIONEER.
Device under test Test all exposed metal surfaces
Reading should Leakage not be above current 0.5mA tester
Also test with plug reversed (Using AC adapter plug as required)
Earth ground
AC Leakage Test
2
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. · The mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. · Screws adjacent to mark on the product are used for disassembly.
2.1 PACKING
7 4
· PACKING PARTS LIST
Mark No.
1 2 3 4 5
Description
Pin Plug Cords (L = 1m) Polyform L Polyform R Polybag 20×26 Operating Instructions (English/French) Carton Box Warranty Card Packing Sheet
Part No.
PDE1248 14904081-000 14904082-000 15020026-510 15204080-0297 15304080-099 ····· ·····
5
3 1 1
NSP NSP
6 7 8
8
2
6
3
GR-408 2.2 EXTERIOR SECTION
18 18
18 18
18
9 18 19
18 20 18 20 19 19
10 2 18 12 5 1
2
19 18
18
11
4 3 3 3 6 6 3 6
15 6 18 18 7 18
6 6 6 6
17
8 16
18 18 18 13 18 18 18 18 13 18 13 18 18 13
18
14
4
GR-408
· EXTERIOR SECTION PARTS LIST
Mark No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 NSP 15 16 17 18 19 20
Description
Front Cabinet EQ Bracket EQ Knob(Black) Power Button EQ On/Off Button Post Rear Panel Bottom Cabinet Bonnet Cover Main Bord Assy (1/4) (EQ PCB) Main Bord Assy (2/4) (POWER PCB) Main Bord Assy (3/4) (EQ ON/OFF PCB) Foot(Black)W/O H/S Main Bord Assy (4/4) (JACK PCB) AC Cord UL Bushing Name Plate Screw Screw Screw
Part No.
10104080-001 12904082-010 12704082-010 12804080-010 12804080-110 13004082-000 18004085-101 ····· 18004083-010 GR408-A GR408-A GR408-A 13821007-010 GR408-A 02360040-006 ····· PAM1776 BBZ30P080FZK IBZ30P080FMC BPZ26P080FMC
NSP
5
1
2
3
4
GR-408
3. SCHEMATIC DIAGRAM
3.1 MAIN BOARD ASSY
POWER SUPPLY
A
AC-2
-29
R22 820/1W
-12
AC CORD UL 02360040-006
250V/630mA AC-1 01804083-520
+29 +12
R21 820/1W
C51 0.22µ/500V
0 INPUT
VC IC1B LA6458S
POWER OFF/ON (LINE OUTPUT MUTE)
A 2/4
POWER PCB
B
OFF ON
EQUALIZER OFF / ON
0
B
R6 6.8k
SW2 : EQUALIZER OFF/ON SW3 : POWER OFF/ON
VR KNOB LED GRAPHIC EQUALIZER ON/OFF
JACK PCB
C
OUTPUT
A 4/4
INPUT
IN BUF AM
0
0
D
A
MAIN BOARD ASSY (GR408-A)
6
A
1
2
3
4
5
6
7
8
GR-408
Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".
GRAPHIC EQUALIZER OUTPUT
A 1/4 EQ PCB A 3/4 EQ ON/OFF PCB
GRAPHIC EQUALIZER OUTPUT
A
R36 6.8k +12 0 VCC IC1B LA6458S GRAPHIC EQUALIZER INPUT 0 -12
GRAPHIC EQUALIZER OUTPUT
0
INPUT BUFFER AMP.
EQUALIZER OFF / ON
GND
VCC
VEE
GRAPHIC EQUALIZER
GRAPHIC EQUALIZER OUTPUT
0
+12
0
0
0
0
0
0
0
B
0 0 0 0 0 0 0 0 0
R6 6.8k
INPUT BUFFER AMP. OUTPUT (EQUALIZER OFF)
GRAPHIC EQUALIZER OUTPUT
GRAPHIC EQUALIZER INPUT
C19
0
OUTPUT GRAPHIC EQUALIZER INPUT
INPUT BUFFER AMP.
0 IC1A LA6458S
GRAPHIC EQUALIZER OUTPUT +12 VCC
VR1-VR14 : 01110203-230
GRAPHIC EQUALIZER OUTPUT
0 -12
0
0
0
0
0
0
0
0
GND
EQUALIZER OFF / ON
VCC
VEE
-12
GRAPHIC EQUALIZER
0
0
0
0
0
0
0
0
0
R7 6.8k
0
0
VEE
+12
6.8k
C
D
VR8
5
6
7
A
8
7
1
2
3
4
GR-408
4. PCB CONNECTION DIAGRAM
4.1 MAIN BOARD ASSY
A
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. For further information for respective destinations, be sure to check with the schematic diagram. 3. View point of PCB diagrams.
Connector
Capacitor
WHITE
SIDE A
P.C.Board
B
Chip Part
SIDE B
A 2/4 POWER PCB
NEUTRAL
A 4/4 JACK PCB
C
A 1/4 EQ PCB
D
8
A
1
SIDE A
2 3 4
LIVE
5
6
7
8
GR-408
A
A MAIN BOARD ASSY
POWER CORD AC
A 3/4 EQ ON/OFF PCB
IC3 IC2 IC1 B
B
C
D
SIDE A
5 6 7
A
8
9
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. · The mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. · When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%, and K=10%). 561 ........................................................ RD1/4PU 5 6 1 J 560 56 × 101 473 ........................................................ RD1/4PU 4 7 3 J 47k 47 × 103 0.5 R50 ..................................................................................... RN2H R 5 0 K 1 1R0 ..................................................................................... RS1P 1 R 0 K Ex.2 When there are 3 effective digits (such as in high precision metal film resistors). 5621 ...................................................... RN1/4PC 5 6 2 1 F 5.62k 562 × 101
Mark No.
Description
Part No.
GR408-A ····· ····· ····· ·····
LIST OF ASSEMBLIES
NSP NSP NSP NSP MAIN BOARD ASSY EQ PCB POWER PCB EQ ON/OFF PCB JACK PCB
A MAIN BOARD ASSY
SEMICONDUCTORS
IC2,IC3 AUDIO IC IC1 IC LA6458SS LED1 LED M5229P 00206458-040 01912000-110
SWITCHES
SW SK-22F03G5 SW PBS-42H03-F18 02012205-110 02014218-110
RESISTOR
VR1-VR14 SLIDE VR. 01110203-230
OTHERS
T1 TRANSFORMER EI-35 01804083-520
6. ADJUSTMENT
There is no information to be shown in this chapter.
10
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 1 NF 1 2 IN 2 3 NF 2 4 IN 3 5 NF 3 6 IN 4 7 NF 4 8 IN 5 9 NF 5 10 20 Vcc 19 GND 18 +Vcc 17 OUTPUT 16 INVERTING INPUT 15 NON-INVERTING INPUT 14 NF 7 13 IN 7 12 NF 6 11 IN 6
·Block Diagram
Vcc GND +Vcc OUTPUT
NONINVERTING INVERTING INPUT INPUT
NF 7
IN 7
NF 6
IN 6
20
19
18
17
16
15
14
560
13
12
560
11
10k
10k
47k
47k
47k
47k
47k
47k
47k
47k
560
560
560
560
560
1
IN 1
2
NF 1
3
IN 2
4
NF 2
5
IN 3
6
NF 3
7
IN 4
8
NF 4
9
IN 5
10
NF 5
·Pin Function
No. 1 2 3 4 5 6 7 8 9 Pin Name IN 1 NF 1 IN 2 NF 2 IN 3 NF 3 IN 4 NF 4 IN 5 Compose the bandpass filter by connecting a capacitor with IN terminals and NF terminals located next to each other, and the gain can be set up by connecting a variable resistor (slide volume). Function No. 11 12 13 14 15 16 17 18 19 20 Pin Name IN 6 NF 6 IN 7 NF 7
Non-inverting input Inverting input
Function Compose the bandpass filter by connecting a capacitor with IN terminals and NF terminals located next to each other, and the gain can be set up by connecting a variable resistor (slide volume). Non-inverting input pin for output OP amp. Inverting input pin for output OP amp. Output pin for output OP amp. Positive power supply pin Ground pin Negative power supply pin
OUTPUT +Vcc GND Vcc
10 NF 5
11
GR-408
LA6458S (MAIN BOARD ASSY : IC1)
· Input Buffer Amplifier ·Pin Arrangement
1
2
3
4
5
VEE
6
7
8
9
Vcc VOUT1 VIN-1 VIN+1
VIN+2 VIN-2 VOUT2 Vcc
·Block Diagram
Vcc 1,9
VIN+1 4 VIN-1 3
6 VIN+2 7 VIN-2
VEE 5 2 VOUT1 8 VOUT2
12
GR-408
8. PANEL FACILITIES AND SPECIFICATIONS
· FRONT PANEL FACILITIES
3
Left channel Equalizer indicators
Right channel Equalizer indicators
Equalizer ON indicator
1
2
1 POWER switch (POWER OFF / ON) When this switch is set to the ON position, power is supplied to the unit's main circuits (Equalizer indicators lights).
NOTE: Even when performing playback without using the functions of this component, be sure that its power switch is ON. If the power switch is OFF, no sound will be produced from the speakers.
3 Equalizer controls These are equalizer controls for the bands 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz, 6 kHz and 15 kHz. When the equalizer button has been set to ON, these controls may be adjusted. When a control is raised upwards from the "0" position, the frequency band corresponding to that control will be emphasized; when the controls is lowered, the frequency band will be attenuated. These controls can be used independently for right and left channels.
2 EQUALIZER button (EQUALIZER OFF / ON) When this button is pressed, the equalizer ON indicator lights and its functions become operative. When pressed once again, this indicator go out and the unit's functions are turned OFF, Use this button in the following manner: ON: When using the equalizer to add sound compensation while performing mixing operations with program sources (FM broadcasts, CD play, tape playback, etc.). OFF: When not using the equalizer, but playing back or recording program sources without compensation.
NOTE: In order to protect your speakers from damage resulting from excessively large inputs, whenever augmenting highfrequency sound over a wide range, be sure not to raise your amplifier's sound volume too high.
13
GR-408
· SPECIFICATIONS
Input terminals (Reference input level/Input impedance) INPUT .......................................................... 150 mV/50 k Gain ............................................................................. -2 dB Output terminals (Reference output level/Output impedance) OUTPUT ..................................................... 150 mV/3.3 k Harmonic distortion (20 Hz ~ 20 kHz, Output 1V) .................................................................................. 0.03 % Frequency response INPUT ................................................... 20Hz~20kHz +0 dB 3 Equalizer bands Center frequencies ................................................ 60 Hz, 150 Hz, 400 Hz,1 kHz 2.4 kHz, 6 kHz, 15 kHz Variable range .......................................................... ±10 dB SN ratio (IHF, A network, short circuit, 1V) INPUT ...................................................................... 106 dB Electrical section, miscellaneous Power requirements ................................... AC 120 V, 60 Hz Power consumption ......................................................... 6 W External dimensions (W x H x D) .......... 420 x 85 x 214 mm 16-9/16 x 3-3/8 x 8-7/16 in. Weight ................................................... 2.2 kg (4 lb. 14 oz.) Accessories Pin-plug cords .................................................................... 2 Operating Instructions ........................................................ 1
NOTE: Specifications and the design are subject to possible modifications without notice, due to improvements.
Accessories Pin-plug cords : PDE1248 (L=1m) × 2 White Red Red
White
14