UPS power failure phenomenon: a Maipu 1KVA-line UPS power supply, output bypass the normal boot, press ON button, the inverter can be transferred from the bypass, but then immediately jump pass and the fault lights, bee buzzer sounding the alarm, press the OFF button to stop the buzzer alarm, bypass the normal output toshiba pa3820u-1brs battery, toshiba pa3821u-1brs battery.
UPS Power Failure Analysis and Maintenance: According to the symptoms, the initial part of the work that the normal control circuit, because, according to ON button, the delay of 1 to 2 seconds, the inverter automatically jump to the working state, but the fault immediately, by the This may largely determine the fault circuit is:
(1) soft-start control circuit short-circuit fault;
(2) power amplifier circuit board output short-circuit fault; aluminum spot welding
(3) The above two are short-circuit fault. Because the bypass output normal, basically ruled out the computer, plug an external device such as the possibility of short circuit. Open the case and found that soft-start sealant deformation has been burned, the lead wire cut, the soft-start with a multimeter measuring each a component of each block, have been burned, replaced by a new soft-start block, connect the power, Press ON switch, the fault still prove that there exist short-circuit fault.
Turn off the power amplifier with a multimeter to measure the output circuit board part of the diode Q13, Q14, Q19, Q20 are normal, the measured power MOS tube (YTFP250) Q7, Q22, Q23 is also normal, measuring the other arm of the MOS power management Q5 , Q17, Q18, Q17 and Q18 that the D asus a32-u6 battery, asus a33-u6 battery between the pole and S pole resistance 0Ω, Q5 is not abnormal. For Q17, Q18, D Two power tube is a pole and S pole in parallel, so the Q17, Q18 welding down a single measurement, Q18 normal, Q17, D and S pole indeed extremely short-circuit breakdown.
Difficult for the market to buy YTFP250, check the manual that IRFP250 YTFP250 almost the same parameters. IRFP250 replaced with one after, and then multimeter test the online arms of equal resistance value, connected to power after the turn, press ON switch, the inverter can work, but the output is 230V or so, adjust the output micro-adjust potentiometer VR3, the output is 220V, sealed with wax or sealant VR3, connected load, the boot after all the normal troubleshooting.
UPS power failure phenomenon: a Maipu 1KVA-line UPS, power bypass is working, according to ON switch, no response, the relay is not closed, the inverter can not work.
UPS Power Failure Analysis and Maintenance: According to the symptoms can be broadly determine the fault in the panel circuit or relay circuit. Open the case, remove the panel, measured with a multimeter first relay, normal. Press ON switch does not work because suspected ON switch is damaged, with a multimeter red, black two pen are the two ends connected to the dell latitude e6400 battery, dell latitude e6500 battery ON switch, press the ON switch, the resistance is 0Ω, prove that ON switch is good.
Connected to the power supply, DC voltage with a multimeter measured the ON switch file at both ends of the DC voltage on the ground and found one end of the voltage, the other side of no voltage, no voltage terminal through a resistor R99 and resistor R100 is connected, and then were measured R99 multimeter both ends of the ground voltage, the voltage at one end, and with one end connected to non-ON voltage. Turn off the power, measured resistance is infinite line R99, and R99 of the resistor value should be 100KΩ, 100KΩ resistor for one, by the power, press the ON switch, the inverter can work in a 220V AC output voltage, then on the load, can work, troubleshooting.
UPS power failure phenomenon: a SANTAK1000VA square wave back style power supply, electricity supply is operating normally, the inverter, the buzzer sounding the alarm long bright light, no output.
UPS Power Failure Analysis and Maintenance: User reflect two days before submission of the UPS, inverter in the sony vgp-bps9 battery, sony vgp-bpl9 battery city when the power switch can be heard inside the machine issued a "snore snore" abnormal sounds, and sounds great, but the output, over a period of time After these symptoms appeared. Open the case, no electricity in the case of no-load power, that the moment you open the switch, UPS with output, the fan can be turned up (the fan using the UPS output voltage 220V). About 2 seconds, the inverter has no output, the above symptoms, the last stage with a multimeter to measure the drive circuit and found that the breakdown Q1 ~ Q3 had been short (Q1 ~ Q3 in parallel connection.)
Can be seen that failure occurred in the city before the UPS inverter when the power switch to issue a "snore snore" sound, is the final stage UPS driver circuit causes transformer arms imbalance in the sound output exception, that is, Q1 ~ Q3 (or Q4 ~ Q6) are part of the damage, the absence of timely maintenance, leading to the end of the arm-driving circuit Q1 ~ Q3 all the damage, cause a short circuit, over-current protection circuit so that actions to block the work of pulse inverter output, so that no output inverter. Replace Q1 ~ Q3, and no damage to other components measured after the power switch, UPS inverter output returned to normal troubleshooting.
UPS power failure phenomenon: a sine wave backup power SANTAK600VA, no electricity when the switch inverter output, buzzer sounding, LDE LED long light.
UPS Power Failure Analysis and Maintenance: As a rule, this failure should first check if the battery is normal dell studio xps 1645 battery, dell studio xps 1647 battery. The power supply uses two YUASANP7-12 (12V, 7.0AH) battery powered in series. Static measurements, a battery voltage of 12V, the other battery voltage 10V, it seems the battery without any problems. Check the 30A fuse, inverter output power Darlington composite pipe MJ11033, before the class to promote the management TIP41C and pulse width modulator inverter circuit (SG3524) the static resistance value of each foot, were not found anything unusual.
Power tests repeated several times, failure remains the same, only occasionally found several times in the no-load, the inverter output can be maintained for about 10 seconds. Inadvertently with a multimeter to detect the relevant parts of the voltage, we found a battery failure when the voltage is 12V, while the other only a 5V battery voltage of about (static measurements only when the battery voltage is 10V .) Replacement of the battery, troubleshooting.
UPS power failure phenomenon: a SANTAK500VAUPS power supply, electricity supply is normal, but the inverter output when the output voltage is low, while the transformer associated with noise. Failure Analysis and Maintenance: When inverter is not working properly, should focus on checking the power of the inverter circuit. A voltage output that the last stage transistor amplifier circuit to promote the work properly, that the last stage transformer noise amplifier circuit to promote the work of the arms are not symmetrical (less likely to damage the transformer itself) is estimated to be two hp probook 5310m battery, hp probook 5320m battery amplifier tubes MJ11033 damage. Multimeter test positive emitter resistance of two transistors, one of which is approximately 50Ω, the other resistance values very large, that has burnt out. After the replacement, troubleshooting.
UPS power failure phenomenon: a SANTAK500VAUPS power, electricity is normal, inverter power supply only works in the state.
UPS Power Failure Analysis and Maintenance: normal mains power supply inverter only work in the state, can not return to the status of electricity supply. In this case, you should first check the AC input fuse. When the fuse is good, and then check the mains power supply ─ ─ inverter switching control circuit. Sampling with a multimeter measuring electricity transformer T1 and the voltage comparator component LM339, found that the mains transformer T1 primary winding open-circuit sampling. After the replacement, troubleshooting.
UPS power failure phenomenon: the electricity supply and the inverter state are working properly, but the inverter, the shutdown is still out.
UPS Power Failure Analysis and Maintenance: As we all know, UPS mains power switch control input and battery positive. Under normal circumstances, both in the electricity supply or the inverter state, the shutdown should be no voltage output. Detection of the power switch with a multimeter and found positive with the battery switch is connected to a group of deformed, not connected well dell latitude d630 battery, dell latitude d830 battery. After the replacement (purchase less than the same type of power switch, can be deformed reed carefully smoothed with fine emery cloth to wear a good contact), troubleshooting.
UPS power failure phenomena: computer configuration: Pentium 133,16 MB RAM, 3GB hard drive, graphics card is S3VIRGE. Recently upgraded to MMXP166, motherboard replacement VXPRO. After the upgrade, start WIN95, it is often inexplicably crash. Restart the report "illegal instruction execution", "Exception error", etc., in DOS, WINDOWS3.2 often crash the next
UPS Power Failure Analysis and Maintenance: First of all, repeatedly installing WIN95, WINDOWS3.2, DOS are not resolved, the virus scan found and removed GRAVE, the option of BIOSSETUP done in a number of adjustments, but the problem persists. Next, consider a hardware failure. First consider the new part, because only the CPU and the motherboard is new for, and then replace the two pieces of the same type of motherboard, the failure still exist.
CPU found in replacing the memory, were normal. And put on ASUS TXP4 motherboard, not only can not, and can not be started from the hard drive. Replace the hard drive, motherboard IDE interfaces that is normal. The hard drive in another machine is working. So far, it seems that each part is normal hp pavilion dm3 battery, hp pavilion dm4 battery, and assembled together they behave properly. Careful observation, that the host power supply is 200 watts, 230 watts of power changed, the ASUS motherboard boot normally.
To confirm, then replace the VXPRO motherboard and found still fail. And for the other 200-watt power supply, but also a failure. An explanation is indeed a problem of power supply and motherboard. Summary: This case is the first cause of the malfunction of the power of the old 200 watt power supply is too low, MMXCPU need more current. Also VXPRO motherboard can not well support multi-Pentium. And that brings me, computer upgrades into account when the relationship between the various components, comprehensive design upgrade program. In addition to a Pentium computer "core" outside, but also to prevent the phenomenon of a small horse-drawn carts .
UPS power failure phenomenon: a SANTAK500VAUPS power supply, electricity supply is normal, when inverter output, but the output voltage is high, rising to 265V.
UPS Power Failure Analysis and Maintenance: According to the UPS power supply works known, and only when the supply of high-voltage protection circuit and the electricity regulator circuit fails, there will be more failures. We can see from the schematic, power supply output voltage sampled by the T2 toshiba pa3395u-1brs battery, toshiba pa3421u-1brs battery, rectifier, filter, add to the voltage comparator U7, 8 feet, 9 feet, and then take the reference voltage terminal. Only when the 8-pin voltage is higher than the 9 pin voltage, the output will jump 4 feet into a low, to control the protection circuit action.
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