The power indicator light is off
1. The fuse is blown, and the voltage has no output. Just replace the fuse.
2. If the indicator light fails, the machine can work normally.
3. The machine cannot work normally, and the power supply part is faulty.
Single extension phone has no sound when it is lifted up
1. The indicator light of the extension user board is off, and the extension lead line is disconnected.
2. The extension user board indicator light is on, and the extension lead wire is short-circuited.
3. The telephone is faulty.
4. The extension circuit of the user board is damaged.
Extension phone pick-up noise
1. When all the phones are noisy, check the power supply voltage and the grounding of the switch.
2. When a single unit is allowed to check the noise, check whether the extension phone and extension line are grounded or crossed.
3. The extension circuit of the switch user board is faulty.
The extension does not ring, you can make calls and make calls
1. A single phone does not ring: a phone is faulty. b The contact of the ringing relay of the extension circuit is closed, and it cannot jump up normally. It can be restored by tapping the relay on the user board with your finger.
2. All extensions do not ring: a The internal ringing circuit of the power box is faulty and needs to be repaired by a special person. b The ringing current power output line is in poor contact with the motherboard, and it can be restored after replaying the power after power off.
Extension phone makes outgoing and incoming one-way calls
1. The phone is faulty.
2. The input and output transformers of the extension circuit are disconnected.
3. The user board is not inserted tightly.
Extension occupied outside line without sound
1. The outside line is open circuit or short circuit.
2. Replace the interrupted line with an internal extension, and use the extension number to call out the test. If the same, the switch trunk board is faulty.
All extensions of the switch have no sound when picked up
1. The switch is due to a circuit failure.
2. The switch power supply voltage element
3. The main clock crystal oscillator of the switch is stopped and there is no clock output. Most of them are caused by factors such as the sudden drop in ambient temperature. After power off, touch the clock crystal of the motherboard with your hand, and then turn it on to restore.
The switch and the computer cannot be connected normally
1. The serial port of the computer is faulty. Replace the computer serial port or computer.
2. The connection between the serial port of the switch and the computer is short-circuited or open-circuited. Use a multimeter to measure and judge or replace the connection line between the switch and the computer.
3. The serial port of the switch is protectively locked, and it can be recovered by resetting the switch.
4. The serial port of the switch is faulty. Professionals are required to repair or replace the motherboard.
The extension cannot make calls
1. The extension line is short-circuited or open-circuited.
2. The extension phone cannot issue numbers normally.
3. The extension number level is level 6, which can only make incoming calls, but not outgoing calls.
4. The extension user uses a password lock.
The extension cannot make incoming calls
1. The level of extension A is level 7. You can only call out, not call in.
2. The extension line is short-circuited or open-circuited.
3. The extension phone will not ring.
4. The extension number is repeated. Each time an extension is called, the extension with the preceding serial number will ring.
What will be transferred to the switchboard when an extension is directly dialed from an outside line?
1. After an outside line user dials the trunk number of the switch, if it exceeds a certain period of time (outline direct dialing interval) time) without dialing.
2. When the outside line user dials the extension number by pulse, the pulse numbering is uneven, and the pulse speed is less than 8 times/sec, or more than 13 times/sec.
3. The line of the outside user is faulty.
4. The extension of the outside caller is busy.
5. The extension called by the outside user has the Do Not Disturb function.
6. The audio frequency deviation of the outside line user’s phone is greater than 3%, which is beyond the normal receiving range of the switch.
The incoming switch of the loop relay does not receive it
1. The ringing frequency of the loop relay is non-international 25HZ, and the local ringing can be adjusted frequency parameter.
2. The ratio of ringing to non-international 1:4 for loop trunk ringing can be adjusted;
3. The trunk line is not well connected to switch.
4. The switch trunk switch is turned on.
Internal line cross-line, single-external line cross-line, cross-talk
1. Whether the internal wiring is reasonable, check whether there are other interference sources affecting the line, and whether the grounding Correct etc.
2. The motherboard chip (simulator 3494) first disconnects the outside line from the machine, and checks whether the outside line is faulty. You can replace it with another trunk line to check.
3. The relay board or motherboard is faulty.
The call is normal, but the number cannot be dialed
The call is normal, which means that the startup circuit of the dial-up chip is working normally. The main reasons are:
1. The dial chip cannot get normal working current. After the dial chip is activated under normal circumstances. The voltage output by the pulse pin makes the electronic gate saturate and find through. At this time, the main current of the dial chip works through the voltage regulator filter circuit from the electronic gate tube. If the current-limiting resistor or isolation diode of the voltage-stabilizing filter circuit is open or soldered, the dial-up chip will get a normal working current.
2. The clock oscillation circuit does not work. After short-circuiting the fifth vertical input line of the dial chip with the fifth horizontal line, measure the voltage of the crystal oscillator output terminal of the component to the ground, which is about 1.5V in normal conditions. If it is not normal, you should first check whether the timing components are in good condition and whether the pins are desoldered. If it is normal, it means that the chip is damaged.
3. The circuit of the dial-up keyboard is abnormal. No pulse dialing, no dual frequency dialing.
Check if the T/P conversion header is connected well. If the b pole of the dual audio amplifier tube has no voltage, it can be judged that the amplifier components are soldered or the printed circuit is broken.
4. The handle cannot send a message. Check whether the handle is disconnected, and whether the resistance of the DC bias resistor of the microphone becomes large or is soldered.
5. The voice sent by the handle is small. If the bias voltage of the receiver is about 2V, it is mostly caused by the reverse connection of the receiver’s lead or moisture. At the same time, check the bias resistance of the microphone, whether there is deterioration, whether the capacitor is defective, etc.
6. The handle cannot be spoken. Touch the b pole and c pole of the preamplifier tube with tweezers. If there is a “click” sound in the handset of the telephone, check whether the spring handle is disconnected, and whether the preamplifier tube and power amplifier tube are in good condition. Whether the output coupling capacitor of the power amplifier is defective. If there is a “click” sound in the earpiece, it should be checked that the components of the side-tone cancellation circuit are defective.
Declare: The above methods are derived from the program system index or shared by netizens. They are for your reference only and do not represent the research views of this website. sex and authority.
