Troubleshooting of HJD04 Programmable switch

Fault description: The HJD04 program-controlled switch and the public network of Posts and Telecommunications adopt the DOD1 loop relay network. All users cannot make an external phone call and are busy. At this time, observe the MFP on the Multi-frequency signaling processing board. The lamp used by the multi-frequency generator is always on a certain position.

Analysis and maintenance of this fault is mostly because the MFP board is suspended and crashed after a set of recorder is occupied ). Troubleshooting method: first, reset and press the RST key, but this method is used with caution during system operation ). Second, the command is reset. In the operation on the part, execute the reset multi-frequency processor command. After the reload, the outgoing loop relay returns to normal.

Fault description when any user in this Bureau calls the 61XXX number, there is often a wrong number, and there is a regular number, all errors to the 65XXX number layer for the mobile phone board ). Observe that the indicator lights of the dual-Tone Multi-frequency processor panel Flash 7 and configure a dual-tone processing board for normal operation ).

This fault is caused by the dual-Tone Multi-frequency processor (DTMP) Board Fault. One of the DTMP board functions is to send dial-up and dual-audio signals to user phones through the system network. The user listens to the dial-up sound normally and the error number does not appear the next time. Therefore, the user can eliminate common circuit faults such as The number generator in DTMP. Generally, the problem occurs on a set of Dual-sound generators. D-host 32 dual-sound generators per Board ). Remove the fault after replacing the DTMP board.

A fault occurs when the call from a digital relay circuit is normal, and the digital access to the relay group circuit fails. No alarm is reported for the maintenance station and the total alarm box. After receiving the user report, go to "querying the current status of the relay circuit by Bureau" and observe that this group of digital relay circuits is closed.

Analysis and maintenance is generally caused by channel or transmission terminal equipment interference or transient changes in the terminal voltage caused by fluctuations in the interface level value and other reasons, the Bureau automatically blocks the relay circuit. The solution is to run the release command on the maintenance platform.

Fault: at most bureaus, digital relay circuits, or digital relay circuits are unavailable. After entering "service operations-querying the current status of the relay circuit by Bureau", no reports are displayed and no alarms are reported.

Some data is lost during maintenance switch. After the data is loaded again, it returns to normal.

Fault symptom Module 1 and module 2 are highlighted with a yellow light on the top and an alarm buzzer is triggered. Go to "Environment query" to observe the running status of the power supply. The screen shows that the power supply blocks 0, 1, 2, 4, and 6 are normal green. The power supply Blocks 1, 3, and 5 generate alarms. The switch runs normally.

If the maintenance switch runs normally, an alarm can be generated for the DDBC secondary power board. First, use a multimeter to measure the bus bar terminal on the DCB1 backplane of the rack. The output voltage is normal. At this time, the DDBC board reset key RT two needle seat) transient, the occurrence of a short harsh scream after the light off the bell. Transient RT initializes the DDBC board to eliminate error alarms. If an alarm is reported after the above operations are performed, the DDBC board fault should be considered and the DDBC board should be replaced.

Fault Phenomenon switch communication relay, the entire machine stops working. Observe the power frame and find that the "undervoltage warning light" is on. The input voltage of a power supply is-42V, and the allowable range of power supply is-43V ~ -56 V ).

Analysis and repair of the fault is caused by the undervoltage protection measures of the battery of the Power rack when the basic power supply voltage of the system exceeds the permitted range. Solution: Check and adjust the basic power supply voltage to the normal value, press the power record of the power rack, and manually press the rst key of the adtn board to reset, and then follow the detailed operation steps of HJD04 system startup and loading. After loading, the entire switching system resumes normal communication.

The audible and visual alarm signals and the current system clock of the fault alarm box are not displayed at all. The maintenance station enters the "service operation" menu for observation, and the "module power supply operation diagram" is blank. The switch device runs normally.

You can perform online operations on the analysis, repair, and maintenance stations, and switch operations are normal. This phenomenon should be caused by the failure to collect data such as the current clock, alarm information, and power running status in the maintenance station and the overall alarm box. Two faults are found to occur at the same time. 1) The overall alarm box TAB is used to indicate that the RS232 chip is broken when the serial communication is maintained. 2) Module 1 controls the DDBC board K2 to maintain the serial communication of the RS232 chip. After the two chips are replaced, the fault is eliminated after the program is loaded.

A digital relay of a Mobile Communications Bureau frequently reports a "component alarm-a general mistake" alarm, but the communication is normal.

The equipment and signal channels at both ends of the analysis and maintenance check are normal, and false alarms are suspected to be caused by incorrect information of the digital relay signaling processing board. Manually reset the DTP board of the digital relay signaling processor. After the reload, the fault disappears.

Fault Cause: The HJD04RM maintenance station displays "poor communication". observe that the indicator light of the ICP Board of the control frame is located at S0.1, and the indicator light of the MP board 0-7 is flashing. The ICP Board and PC reset are invalid. Switch communication is normal.

The Analysis and overhaul ICP Board is connected to the maintenance station through ports 2B + D to realize communication between the system and the maintenance station. The switch communicates smoothly, indicating that the system runs normally. The fault point should be between the ICP and the maintenance platform. After investigation, the fault is caused by the disorder of the ICP program due to the large power shock wave during the maintenance and maintenance of the protection station. Processing Method: plugging the ICP Board out so that it is completely powered off) and then inserting it. Then, reset the board and PC to eliminate the fault.

Fault Cause: HJD04RM has no bell output. Check the user cabinet. users in the same frame are not sent by Bell.

The Analysis and maintenance adopts the segmented compression method. First, the bell output voltage is measured on the RMDCB2 backplane ll with a multimeter, But the bell current voltage is not measured on the UC16/UCI terminal of the PCMB20C board, it is determined that the 1A fuse pipe of the board is broken. After the fuse pipe is replaced, it will return to normal.

When the room temperature is as low as 10 degrees, the "-5 V + 12 V" power plug-in of the HJD04RM power control cabinet sends an alarm. At this time, the host is yellow, the plug-in "over-current" alarm light is on, the total alarm desk white light is on, and the component alarm is displayed.

Analysis and overhaul of the power supply plug-in voltage output control end over-current protection circuit using a thermal device parameters change, sensitive to temperature reflection. Once the room temperature drops, the system will work and cut off the output. If an alarm is generated, this is not a real power plug fault ). Troubleshooting method: After the room temperature is increased, the alarm will be cleared to return to normal.

1. Analysis and Handling of Common Faults of HICOM programmable Switches