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SERVICE MANUAL
7 S ERVICE MANUAL
XC063
2007
HA-NC250-J, HA-NC250-C,
HA-NC250-E
COPYRIGHT © 2007 Victor Company of Japan, Limited
Frequency response
Noise reduction
Sensitivity
Input impedance
Driver unit
Power supply
Battery life
Cord length**
Mass
Accessories
Designs and specifications are subject to change without notice.
STEREO HEADPHONES
Model No.
SPECIFICATION
8 Hz - 24, 000 Hz(Power-ON)
More than 16.5 dB at 150 Hz
102 dB/1 mW (power - ON)
100 dB/1 mW (power - OFF)
Ω
40
(power - ON), 96
Ø40 mm
AAA battery (DC 1.5 V) x 1
Approx. 20 hours* (using Manganese AAA battery)
Approx. 50 hours* (using Alkaline AAA battery)
* Varies depending on operating conditions.
* Without ambient noise.
1.2 m (3.9 ft) (detachable)
150 g (5.30 oz) (incl. battery)
140 g (4.94 oz) (excl. battery)
Carrying case x 1, Manganese AAA battery (R03) x 1,
Cord x 1(1.2 m Ø3.5 Stereo plug
Stereo phone plug adapter 6.3 mm (1/4 inch) x 1
COPYRIGHT © 2007 Victor Company of Japan, Limited
(Lch)
Ω
(power - OFF)
↔
Ø3.5 Stereo plug, Dual plug adapter (for in-flight use) x 1,
No.XC063
2007/7
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Summary of Contents for JVC HA-NC250-J
- Page 1 SERVICE MANUAL STEREO HEADPHONES XC063 2007 7 S ERVICE MANUAL HA-NC250-J, HA-NC250-C, HA-NC250-E Model No. (Lch) COPYRIGHT © 2007 Victor Company of Japan, Limited SPECIFICATION Frequency response 8 Hz - 24, 000 Hz(Power-ON) Noise reduction More than 16.5 dB at 150 Hz...
- Page 2 SECTION 1 PRECAUTION This service manual does not describe PRECAUTION. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. SECTION 3 DISASSEMBLY Head band Hanger cover (R) Ear pad (R) Hanger (R) Microphone (R) Speaker unit (R) Ear pad holder (R) Rch board Seal...
- Page 3 Removing the housings(L)/(R) (1) Remove the ear pads(L)/(R) and ear pad holders(L)/(R). * When attaching the ear pad holders, be careful as the left and right parts are different. (2) Remove the eight screws A attaching the housings(L)/(R). Removing the Lch board / Rch board * Remove the housings(L)/(R).
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Page 4: Troubleshooting
SECTION 4 ADJUSTMENT Adjustment of volume (1) When replacing the "Lch board" or "Rch board", first, check if VR1 is in the "Medium" position as shown in the figure below. (2) If VR1 is not in the "Medium" position, adjust it to "Medium". Minimum Medium Rch board and Lch board...