DM588 Service Manual
GPS
TTFF (Cold Start)
< 1 min
TTFF (Hot Start)
< 10s
Horizontal Positioning
Precision
< 10m
9. Devices for Maintenance and Test
Device
Specification
Standard Signal Generator
Frequency range: 10MHz~3GHz
Modulation: Frequency modulation and external modulation
Output: -127dBm/0.1uV to > -47dBm/1mV
Power Meter
Input impedance
: 50Ω
Operating frequency: 100MHz~1000MHz
Measurement range: About 50W
Frequency Deviation Meter
Frequency range: 100MHz~1000MHz
Digital Voltmeter
Measurement range: DC 10mV~20V
Input impedance: High input impedance of minimum circuit
load
Oscilloscope
30MHz~100MHz
High-Sensitivity Frequency
Counter
Frequency range: 100MHz~1000MHz
Frequency stability: 0.2ppm or lower
Ammeter
20A
Audio voltmeter
Frequency range: 50Hz~10KHz
Voltage range: 1mV~10V
Audio Sweep Generator
Frequency range: 50Hz~5KHz or higher
Output: 0V~1V
Distortion Tester
Capability: 3% or lower at 1KHz
Input level: 50mV~10Vms
Spectrum Analyzer
Measurement range: 100Hz~3GHz or higher
16Ω Load Simulator
About 16Ω, 5W
Stabilized Voltage Supply
Output voltage: 5V~30V
Current: 20A
10.Troubleshooting
SN
Failure Description
Troubleshooting
1
Startup failure
A. Check remaining battery. For low battery, charge or
replace it.
B. Poor contact of On/Off key. Clean metal dome arrays
with alcohol.
C. Poor contact between binding post and power supply.
Install power supply again.
D. Open fuse due to reverse connected power supply.
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Summary of Contents for DM588
Page 142: ...DM588 Service Manual Figure 4 Top Layer Layout Drawing of Main Board B Board 139 ...
Page 143: ...DM588 Service Manual Figure 5 Bottom Layer Layout Drawing of Main Board B Board 140 ...
Page 144: ...DM588 Service Manual Figure 6 Top Layer Layout Drawing of Main Board D Board 141 ...
Page 145: ...DM588 Service Manual Figure 7 Bottom Layer Layout Drawing of Main Board D Board 142 ...
Page 147: ...DM588 Service Manual Figure 9 Top Layer Layout Drawing of LCD Board 144 ...
Page 148: ...DM588 Service Manual Figure 10 Bottom Layer Layout Drawing of LCD Board 145 ...
Page 150: ...DM588 Service Manual Figure 12 Top Layer Layout Drawing of Key Board 147 ...
Page 151: ...DM588 Service Manual Figure 13 Bottom Layer Layout Drawing of Key Board 148 ...