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A
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SKU: N90QBLK
SKU: N90QGLD
Safety Information
Disassembly Instruction
Set Block Diagram
Schematics Diagram
Layout Diagram
Accessories
Mechanical Exploded View
Mech. & Elec. Parts List
Released by Global Quality, Rev.1.2, Jan./2016
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SPECIFICATION
• Frequency response : 10-25kHz
• Sensitivity : 110dB SPL @ 1kHz/100mV
• Driver impedance : 32ohms
CONTENTS
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Summary of Contents for AKG N90
- Page 1 SKU: N90QBLK SPECIFICATION • Frequency response : 10-25kHz SKU: N90QGLD • Sensitivity : 110dB SPL @ 1kHz/100mV • Driver impedance : 32ohms CONTENTS Safety Information Disassembly Instruction Set Block Diagram Schematics Diagram Layout Diagram Accessories Mechanical Exploded View Mech. & Elec. Parts List Released by Global Quality, Rev.1.2, Jan./2016...
- Page 2 Important Safety Instructions 1. Read these instructions. CAUTION 2. Keep these instructions. 3. Heed all warnings. RISK OF ELECTRIC SHOCK. DO NOT OPEN. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7.
- Page 3 Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1.
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Page 4: Safety Precautions
SAFETY PRECAUTIONS The following check should be performed for the continued protection of the customer and service technician. LEAKAGE CURRENT CHECK Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester between the earth ground and all exposed metal parts of the appliance (input/output terminals, screwheads, metal overlays, control shaft, etc.). -
Page 5: Disassembly Instruction
DISASSEMBLY INSTRUCTION 1.Put the headphone on 2.Separate the ear cushion 3.Disassemble ear cushion. table . from the headphone. 4.Remove the screws from left/right 6. Separate the left/right 5.Separate the left/right speaker cover by electric screw driver, speaker wire by soldering tool , Mic wire by soldering tool. - Page 6 Need clear Need clear the glue the glue firstly. firstly 7. Remove the screws from the 8. Take the left earcup 9. . Take the right earcup left /right earcup by electric down. down. screw driver, 12pcs in total. Loosen the FPC button.
- Page 7 14. Remove the stir-button screw 13. Remove the USB screw and by electric screw driver , put out socket screw by electric screw the button and stir part by tweezers. driver. 15. Remove every core wire on I/O Board in order by soldering tool.
- Page 8 16. Put the lithium battery 17. Put the lithium Convert out of left earcup. Board out of left earcup. Remove battery wire. 18. Remove every core wire on Convert 19. Remove every battery wire in order Board in order. by soldering tool.
- Page 9 Remove screws Logo Volume Badge Ring 20. Remove the screw which fix logo badge and volume ring by electric screw driver. Left Earcup Bolt Right 21. Separate the left/right earcup. Stop part Earcup...
- Page 10 AKG N90 Block Diagram(IO Board) D+/D- CH_Prog BAT_FULL Micro- VBAT MCP73837 3.3V m for MCU (Charging) E-Switch TPS73633 Battery Battery 15 Pin Connector to Main On/off Board Power Button On/off Slide Button LED1/LED2 LED1/LED2 Mode Button Mode Button Mode Button...
- Page 11 AKG N90 Block Diagram(Main Board) +3.3Vm ACP2.0C VBAT Headback sensor D+/D- TPS73633 max21000 max21000 +3.3V HP CH_Prog (PIC32MX450) BATT Full 15 Pin +2.5V LED1/2 Signal selection I2S data Switch Connec TPS78225 (SN74LVC2G04) (SN74HC125) Flash tor to (SST25VF064C) (SST25VF064C) Main Board Voltage -2.5V...
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Page 21: Main Board - Top View
MAIN BOARD - TOP VIEW... -
Page 22: Main Board - Bottom View
MAIN BOARD - BOTTOM VIEW... - Page 23 IO BOARD...
- Page 24 ENCODER BOARD - TOP VIEW...
- Page 25 ENCODER BOARD - BOTTOM VIEW...
- Page 26 BATTERY CONVERT BOARD - TOP VIEW...
- Page 27 AUX IN BOARD - TOP VIEW...
- Page 28 AUX IN BOARD - BOTTOM VIEW...
- Page 29 ANC BOARD - TOP VIEW...
- Page 30 ANC BOARD - BOTTOM VIEW...
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Page 31: Accessories Parts List
Pouch for Headphone Battery Bank Pouch for Power Bank Audio Cable, Flight Adaptor, D6.3 Adaptor, USB Cable ACCESSORIES PARTS LIST Part Number Description 87.00210454 MICRO USB CHARGING CABLE L1200MM 87.00210455 ANDROID CABLE W/REMOTE CONTROL D3.5 TO D2.5 1.2M 34.119302 FLIGHT ADAPTER D3.5MM PLUG 87.00210451 MFI CABLE W/REMOTE CONTROL D3.5 TO D2.5 1.2M 87.00210452... - Page 32 SET MECHANICAL EXPLODED VIEW HEADBAND RIGHT EARPHONE LEFT EARPHONE...
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Page 33: Spare Parts List
SPARE PARTS LIST Pos. No. Part Number Description 86.10456009 Headband Shrapnel SUS301 86.10458009 Encode Board PCBA 86.10458006 IO Board PCBA 86.10458007 Aux in Board PCBA 86.10458004 Main Board PCBA 86.10458005 ANC Board PCBA 86.10458011 Right Earcup w/Lamp leather 93.41045003 Right Ear Cushion Module 86.10458008 MIC Board PCBA 74.242038...