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.
38
Содержание DM588
Страница 142: ...DM588 Service Manual Figure 4 Top Layer Layout Drawing of Main Board B Board 139 ...
Страница 143: ...DM588 Service Manual Figure 5 Bottom Layer Layout Drawing of Main Board B Board 140 ...
Страница 144: ...DM588 Service Manual Figure 6 Top Layer Layout Drawing of Main Board D Board 141 ...
Страница 145: ...DM588 Service Manual Figure 7 Bottom Layer Layout Drawing of Main Board D Board 142 ...
Страница 147: ...DM588 Service Manual Figure 9 Top Layer Layout Drawing of LCD Board 144 ...
Страница 148: ...DM588 Service Manual Figure 10 Bottom Layer Layout Drawing of LCD Board 145 ...
Страница 150: ...DM588 Service Manual Figure 12 Top Layer Layout Drawing of Key Board 147 ...
Страница 151: ...DM588 Service Manual Figure 13 Bottom Layer Layout Drawing of Key Board 148 ...