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36
GROUND ZERO
TROUBLESHOOTING
General
Symptom Cause Remedy
Power does not
turn on.
(No sound is
produced.)
Fuse is blown
Replace with a fuse of the
same rating amperage. If the
fuse blows again, consult your
local retailer.
Incorrect wiring Consult your local retailer.
No sound comes
from the unit or its
external amplifier
Wiring for amplifier output is
incorrect, or there is a short
circuit among the output
wiring.
Refer to the unit wiring
diagram to check proper
connections, make sure the
wiring is done correctly.
The unit is in MUTE mode. Turn off the MUTE function.
RCA output wiring is incorrect
Check and properly connect
the RCA output with the
external amplifier.
Wiring between external
amplifier’s REM terminal and
the unit’s antenna lead is
incorrect, or antenna output
lead of the unit is short circuit
to ground.
Properly connect the REM
terminal of the external
amplifier and the unit’s
antenna output lead.
Nothing happens
when buttons are
pressed. Display is
not accurate.
Panel or main unit connectors
are dirty.
Wipe the dirt off with a soft
cloth moistened with cleaning
alcohol.
Sound skips or is
noisy
Compact disc is dirty
Clean the compact disc with a
soft cloth to avoid scratching
the surface of the disc.
CD
Sound is poor
directly after
power is on.
Compact disc is heavily
scratched or warped.
Replace with a compact disc
without scratches.
Water or moisture may have
formed on the internal lens.
Let it dry for about 1 hour
with the power on.
37
GROUND ZERO
SPECIFICATIONS
GENERAL
Operation Voltage: DC 12V
Operation Voltage Range: 10-16.0V DC
Maximum Operation Current: 10A
Grounding System: Car Battery Negative
Pole
Installation Dimension (W x H x D) :
178 x 50 x (165+25) mm
Installation Angle: Vertically 0°~+30°
Horizontally ±15°
Net Weight: 2.5Kg
AUDIO
Audio Output Impedence: 10K
Audio Output Level: 4 Vrms
( under normal audio input level at
maximum output volume)
FM RADIO
Signal Noise Ratio: 60 dB
Useable Sensitivity (S/N 30 dB) 10 dB
Frequency Response (± 3 dB):
40Hz~ 12,5Khz
Station Seeking Level: 20~30 dBuV
Distortion: 1.5%
Stereo Separation (1 KHz): 30 dB
Antenna Impedance:75
VIDEO
Normal Video Input Level: 1.0±0.2V (CVBS),
Video Input Impedance: 75
Video Output Impedance: 75
Video Output Level: 1.0±0.2V
(under normal video input level)
AM RADIO
Usable Sensitivity (S/N 20 dB): 30 dB
Distortion: 1.5%
TFT MONITOR
Screen Diagonal: 7 inch
Usable Display Area: 154.08(W) x 86.58(H)
Resolution: 1440(W) x 234(H)
Brightness: 400cd/m
(measure the center brightness after 30
minutes)
Contrast: 60(minimum)
Response Time: Rise = 30ms,
Decline = 50ms
Viewing Angle: From Top = 65 /
From bottom = 40
LED Life Cycle: 20000 hours (at 25°C)
DVD PLAYER
Signal / Noise Ratio: 90 dB
Dynamic Range: 90 dB
Distortion (line out): 0.1%
Frequency Range (± 3 dB): 20Hz~ 20KHz
Maximum Output Power: 40Wx4
Loaded Impedance: 4
AUX IN
Distortion: 0.5%
Frequency Response (± 3 dB): 20Hz~
20KHz
Audio Input Level:1 Vrms
ENVIRONMENT
Operating Temperature: -20°C ~+60°C
Storing Temperature: -30°C ~+80°C
Operating Humidity: 45°C ~80°C RH
Storing Humidity: 30°C ~90°C RH
41


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