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GX-A422SI
Power Amplifier
OWNER'S MANUAL
SET BLOCK DIAGRAM
SET WIRING DIAGRAM
SCHEMATICS DIAGRAM S
Released Global Quality 2015
CONTENTS
LAYOUT DIAGRAMS
2
MECHANICAL EXPLODED VIEW
16
PACKAGING INSTRUCTIONS
17
18
Harman Consumer Group, Inc.
8500 Balboa Boulevard
Northridge, California 91329
Service Manual
Rev 1.0, 03/2015
22
26
27
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Summary of Contents for Harman JBL GX-A422SI
- Page 1 Service Manual GX-A422SI Power Amplifier CONTENTS LAYOUT DIAGRAMS OWNER’S MANUAL MECHANICAL EXPLODED VIEW SET BLOCK DIAGRAM PACKAGING INSTRUCTIONS SET WIRING DIAGRAM SCHEMATICS DIAGRAM S Released Global Quality 2015 Harman Consumer Group, Inc. Rev 1.0, 03/2015 8500 Balboa Boulevard Northridge, California 91329...
- Page 2 GX-A422SI power amplifi er OWNER'S MANUAL...
- Page 3 INTRODUCTION THANK YOU for purchasing a JBL GX-A422SI amplifier. So we can better serve you should you require warranty service, please retain your original ® sales receipt and register your amplifier online at www.jbl.com. INCLUDED ITEMS GX-A422SI Amplifier (x 1) Speaker-level input harness LOCATION AND MOUNTING Although these instructions explain how to install the GX-A422SI in a general sense, they do not show specific installation methods that may be...
- Page 4 INSTALLATION LOCATION Amplifiers need air circulation to stay cool. Select a location that provides enough air for the amp to cool itself. • Suitable locations are under a seat (provided the amplifier doesn’t interfere with the seat adjustment mechanism), in the trunk, or in any other location that provides enough cooling air.
- Page 5 POWER AND GROUND CONNECTIONS IMPORTANT: Disconnect the vehicle's negative (–) battery terminal before beginning the installation. The GX A422SI amplifier is capable of delivering high power levels, and requires a heavy-duty and reliable connection to the vehicle’s electrical system to achieve optimal performance. Please adhere to the following instructions carefully. USING THE CONNECTORS the GX-A422SI uses the same type of screw terminals for power and speaker connections.
- Page 6 GROUND (GND) CONNECTION Power Connectors Connect a wire (minimum 10AWG – 5.3mm from the amplifier’s GND terminal directly to a solid point on the vehicle’s chassis. • For a good connection, use sandpaper to clear the paint from the metal surface at this chassis location.
- Page 7 SPEAKER AND INPUT CONNECTIONS Always connect the (+) speaker terminal on the amplifi er to the (+) terminal on the speaker and the (–) speaker terminal on the amplifi er to the (–) terminal on the speaker. IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier terminals and speaker terminals.
- Page 8 INPUT CONNECTIONS Connect your source unit or processor's line outputs as shown in the illustration below. L+L–R–R+ Line Outputs Source Unit See Set The Crossover Controls, on page 10, for information about setting the amplifier's controls. USING THE SPEAKER-LEVEL INPUTS If your source unit doesn't have line-level outputs you can use the included speaker-level input harness to connect the amplifier to the source unit's speaker outputs.
- Page 9 SPEAKER CONNECTIONS: BRIDGED OPERATION Bridged operation provides a single high-power channel for a subwoofer Minimum speaker impedance: 4 ohms Connect the subwoofer to the RL (+) and RR (–) terminals.) NOTE: You can connect two 2-ohm subwoofers in series to maintain the required 4-ohm impedance for bridged operation.
- Page 10 INPUT CONNECTIONS: BRIDGED OPERATION Connect your source unit or processor's subwoofer line output to the amplifier's left input, as shown in the illustration below. NOTE: Use a "Y"-adapter to connect the source unit to the amplifier's left and right input jacks. L+L–R–R+ Subwoofer "Y"-Adapter...
- Page 11 CONTROLS, INPUT CONNECTIONS AND INDICATORS L+L–R–R+ Speaker-Level Crossover Bass Boost Line-level Protection Input Connectors Input Connector Filter Switch Switch Indicator Level Power Control Indicator SET THE CROSSOVER CONTROLS 2-CHANNEL OPERATION Crossover Filter switch: • If you have connected the amplifier to a pair of 6" or smaller full-range speakers, set the Crossover Filter switch in the “HP” (high-pass) position. This will limit the amount of low-frequency energy sent to the speakers, significantly reducing distortion and preventing the speakers from damage.
- Page 12 BRIDGED OPERATION Crossover Filter switch: When operating the amplifier in bridged mode into a subwoofer, set the Crossover Filter switch in the “LP” (low-pass) position. This will limit the amount of high-frequency energy sent to the subwoofer. SET THE INPUT LEVEL 1.
- Page 13 TROUBLESHOOTING If your amplifier isn't performing the way you think is should, check to see if the problem is covered in this section before calling your dealer or contacting JBL customer service. PROBLEM CAUSES AND SOLUTIONS No sound (the amplifier's Power LED is off) •...
- Page 14 PROBLEM CAUSES AND SOLUTIONS Sound only comes from some of the speakers • Check that the vehicle audio system's source unit's balance and fader controls are set to their connected to the amplifier center (midpoint) positions. Sound is too quiet, even with the vehicle audio •...
- Page 15 SPECIFICATIONS GX-A422SI Peak power 600W Rated power output @ 4 ohms 40W x 2 Bridged power output (4 ohms, 1% THD) 110W x 1 THD+N at rated power <1% Signal-to-noise ratio (rated output @ 4 ohms) >93dB Effective damping factor (4 ohms) >50 Frequency response (±1dB) 20Hz –...
- Page 16 SET BLOCK DIAGRAM Class AB Audio Power Amplifier HP/LP pass variable crossover bass boost crossover INPUT SENS 0.2V-4V FLAT 10Hz 80Hz ＞ 40KHz input selector L input 80Hz 12dB/ oct 45Hz 0-12dB L -out 2Ω/4Ω HI IN Pitch 2.5mm Class AB Audio Power Amplifier HP/LP pass variable crossover bass boost...
- Page 17 2 channel 2Ω ） ） 1.GX-A422SI (4Ω...
- Page 18 SCHEMATICS DIAGRAM - FRONT END BOARD 100P 681(NC) R13A C11A 220R 10U/16V SW2A FL LP 80Hz 5.6K SW2P3T 10U/16V ESD1 FL FULL R20A 1.6K NJM4560 R12A 4560 R10A NJM4560 4560 10U/16V 4560 10U/16V FL HI 80Hz FL1 LP 180Hz C23A R22A R21A 8.2K...
- Page 19 SCHEMATICS DIAGRAM - MAIN BOARD - POWER PART +15V 104P -AMP1 P+12V R10P CN1B -15V 10mm 220K 4.7R +BATT 2.5MH U2PA 4560 W1500/25V R11P C124 C125 +12V -AMP C111 -15V U2PB 4560 +15V R16P C152 PGND 2.2K 2SC1815 30mm RCA-PRO 10mm POWER CC104...
- Page 20 SCHEMATICS DIAGRAM - MAIN BOARD - AMPLIFIER PART +VCC R246 C300 15mm 100p D203 R269 PROT Q211 Q209 IN4148 R256 Q206 Q213 2N5401 R275 680R 2SC1815 C231 R266 R259 R251 -AMP1 220R/0.5W CW 10u/50V 100P C192B PTC NC R231 Q203 C236 R247 Q202...
- Page 21 SCHEMATICS DIAGRAM - TEMPERATURE PROTECTION PART 的 脚 to7/7 TL494 LP 8.5 47uF/16V 2N3906 2.2K ℃ A:62 1.5V 1.5V LM393 680R 2SC1815 2.2K LM393 2.2K 3.3M 2.7K 8.2K 100uF/16V 83-pro;66-huifu 2SC1815 560K 7.5K 2.7K 080523000012 NTC1...
- Page 22 PCB LAYOUT DIAGRAM - FRONT END BOARD (TOP VIEW)
- Page 23 PCB LAYOUT DIAGRAM - FRONT END BOARD (BOTTOM VIEW)
- Page 24 PCB LAYOUT DIAGRAM - MAIN BOARD (TOP VIEW)
- Page 25 PCB LAYOUT DIAGRAM - MAIN BOARD (BOTTOM VIEW)
- Page 26 SET MECHANICAL EXPLODED VIEW Front End Board Amplifier Board Screw PM3*4MM Screw PT3*8MM Screw 3*6MM Screw Mica Sheet Rear Panel Front Panel Logo Plate Decorative Plate Heat Sink Item Part Number Description...
- Page 27 Packaging Instructions Part Number Description Main Unit Label S/N Label EPE Foam Bag PE Foam PE Foam Cable Screws PE Bag User Manual PE Bag Beauty Box Carton Box...
- Page 28 Spare Part List Item Part Number Description 88FA03200352 FRONT-END PCBA GX-A422SI 010103000885 Resistor 0 1/8W-0805 ±5% 010103000551 Resistor 0 1/4W ±5% 1206 010103000121 Resistor 220 1/10W ±1% 0603 010103000017 Resistor 1K 1/10W ±1% 0603 010103000031 Resistor 1.1K 1/10W ±1% 0603 010103000077 Resistor 1.6K 1/10W ±1% 0603 010103000003...
- Page 29 010103000885 Resistor 0 1/8W-0805 ±5% 010103000514 Resistor 4.7 1/8W ±1% 0805 010103000624 Resistor 4.7 1W-2512 ±5% 010103000571 Resistor 22 1/4W ±5% 1206 010103000645 Resistor 22 1/3W ±5% 1210 010103000261 Resistor 47 1/10W ±1% 0603 010103000448 Resistor 220 1/8W ±1% 0805 010103000652 Resistor 22 1W ±5% 2512 010103000340...
- Page 30 020113000070 Capacitor 102/50V 0805 NPO ±5% 020123000171 Capacitor 103/50V 0603 X7R ±5% 020123000164 Capacitor 104/50V 0603 X7R ±10% 020123000059 Capacitor 104/50V 0805 X7R ±10% 020133000039 Capacitor 107/6.3V 1206 X5R ±20% 020123000011 Capacitor 122/50V 0603 X7R ±10% 040203000043 Zener diode 3.9V DO-213AA 0.5W 040103000020 diode LL4148 DO-213AA ST 050103000003...
- Page 31 EVA gasket 8*8*5mm LS0201000083 screw PA4*20MM LS0101000086 screw 3*6MM BZ0302000021 PE bag 240*175*0.05MM BZ0102000185 pearl cotton bag 270*260*0.5MM EPE CH0102000540 gift box L220*W250*H90mm Harman GX-A422SI LP0102000939 OM 210m*140mm Harman GX-A422SI WX0302000611 master carton Harman GX-A422SI 170103000883 Wire 1007# 24AWG 4P L=200mm P=2.5...
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