DR600 Service Manual
When AC power supply is off, the electric relay (U1) is released. The DC is connected to U2 via the
electric relay (U1) contact. If the panel switch (J5) is on, the electric relay U2 will be switched on, so is the
repeater.
The panel switch (J5) is off, and U2 is released, which cut off the baseband DC power supply B13V
including the RF power supply R13V.
Over-voltage Protection
Figure 3-9 Over-voltage Circuit Protection
As the Figure 3-9 shows, the breakdown voltage of the voltage stabilizing diode is 18V+/-0.5V. If the input
DC volatage is over 18V+/-0.5V, the Q1 breaks over with Q2 being cut off, and the electric relay U2 will be
released to cut off the DC power supply B13V, including the RF power supply R13V.
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Summary of Contents for DR600
Page 1: ......
Page 37: ...DR600 Service Manual 33 ...
Page 110: ...DR600 Service Manual Figure 2 Rx Module Bottom Board PCB View 106 ...
Page 111: ...DR600 Service Manual Figure 3 Tx Module Top Board PCB View 107 ...
Page 113: ...DR600 Service Manual Figure 6 Baseband Mainboard Top Board PCB View 109 ...
Page 114: ...DR600 Service Manual Figure 7 Baseband Mainboard Bottom Board PCB View 110 ...
Page 116: ...DR600 Service Manual Figure 10 Power Board Top Board PCB View 112 ...
Page 118: ...DR600 Service Manual Figure 13 Enternet Board Top Board PCB View 114 ...
Page 119: ...DR600 Service Manual Figure 14 Enternet Board Bop Board PCB View 115 ...
Page 150: ...DR600 Service Manual Figure 21 Baseband Mainboard Schematic Diagram 146 ...