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Beijing Pusanda Instrument Technology Co., Ltd
No response when starting up? Gradual troubleshooting approach for power supply faults in cold and hot temperature shock test chambers
Date: 2025-10-20Read: 0
Cold and hot temperature shock test chamberUsed to simulate the performance stability of products in high and low temperature transient conversion environments (such as -55 ℃ →+150 ℃), but if encountering a power failure of "no response when starting up", it may cause experimental interruption or even equipment damage. Master the troubleshooting ideas of the system, be able to quickly locate problems and restore device operation.
Step 1: Basic power supply inspection
This is a crucial but easily overlooked aspect. Firstly, check the power socket at the location of the test chamber: use a mobile phone charger or an electric pen to test whether the socket is powered on (the indicator light is on or the neon tube of the electric pen is on); Confirm whether the connection between the power cord, socket, and device plug is secure (long-term use may cause the plug to oxidize or loosen). If it is a three-phase electrical equipment (commonly found in high-power test chambers), it is necessary to check whether the phase sequence of the three-phase power supply is correct (phase sequence errors may cause the compressor to reverse or not start), and determine through the phase sequence protector indicator light (if the indicator light is abnormal, the phase sequence needs to be adjusted). Some test chambers are equipped with leakage protection switches or air switches. Check if they are in the "ON" state (if tripped, investigate the cause of short circuit or overload before resetting).
Step 2: Equipment power switch and fuse
After confirming that the external power supply is normal, check the power switch of the test box itself: some equipment is equipped with a main power switch (usually located on the side or back of the box), ensure that it is in the "ON" position (the switch indicator light is on); Open the back cover of the equipment control cabinet (power-off operation is required!), find the fuse box labeled "FUSE" (commonly found at the power circuit board or main power supply entrance), and observe whether the fuse is blown (the metal wire inside the blown fuse is broken, or the shell is blackened). If the fuse is blown, it is necessary to replace it with a fuse of the same specification (the specification parameters are usually marked on the fuse box or manual, such as 2A/250V or 5A/250V), and the use of copper wire or other substitutes is prohibited (otherwise it may cause larger faults). If the fuse frequently blows, it may be due to an internal circuit short circuit (such as damage to the power module or aging of the circuit), and professional personnel should be contacted for maintenance.
Step 3: Control the circuit board and power module
If the external power supply and fuse are normal, but the device still does not respond (the display screen does not light up, the buttons do not respond), the problem may be on the control circuit board or power module. The control circuit board is the "brain" of the device, responsible for receiving power on signals and distributing power to various components such as compressors and refrigeration systems; The power module converts the mains power (220V/380V) into the DC power required by the equipment (such as 12V, 24V). Check the indicator lights on the control circuit board (if any): If there are no lights, it may be that the circuit board is not powered on (check if the power input interface is loose) or the motherboard is faulty; Measure the output voltage of the power module with a multimeter (such as+5V,+12V, and other common voltage values). If the output is abnormal (such as 0V or far below the nominal value), it indicates that the power module is damaged (and needs to be replaced with a module of the same model). Some test chambers are equipped with a "power failure self-test function", which can view error codes (such as "E01: power module abnormality") through the operation panel and directly locate the problem point.
Step 4: Special Scene Investigation
If the above steps do not solve the problem, special scenarios need to be considered: firstly, if the equipment is not used for a long time (such as more than 3 months), it may cause the capacitor to age (unable to store energy normally) or the circuit board to become damp (decreased insulation performance). You can try to preheat it with power for 10-15 minutes (some devices need to activate the power management system); The second issue is unstable power supply voltage (such as laboratory voltage fluctuations>± 10%), which may cause protective shutdown of the control circuit board (check if the voltmeter displays within the range of 220V ± 10%, and if it exceeds, install a voltage regulator); The third issue is that the connection wires between the control panel and the motherboard are loose (often after transportation or vibration). Open the equipment door to check if the cable interface is securely plugged in (re plug and fix).
Cold and hot temperature shock test chamberAlthough the power failure may manifest as a single issue (no response upon startup), it may involve multiple links such as external power supply, internal circuits, and control modules. Through a gradual investigation from the outside to the inside, from simple to complex, not only can problems be quickly solved, but secondary damage caused by misoperation can also be avoided, ensuring the safe and stable operation of the equipment.