负载供电电压过低，有三个故障可能：1、负载过重，使输出电压下降；2、稳压回路元件不良，导致电压反馈信号过大；3、开关管低效，使电路（开关变压器）换能不足。
检查与修复方法：
a、将供电支路的负载电路逐一解除（注意！不要以开路该路供电整流管的方法来脱开负载电路，尤其是接有稳压反馈信号的+5V供电电路！反馈电压信号的消失，会导致各路输出电压异常升高，而将负载电路大片烧毁！）判断是否由于负载过重引起电压回落；如切断某路供电后，电路回升到正常值，说明开关电源本身正常，检查负载电路；输出电压低，检查稳压回路。
GE 1600 AMP CIRCUIT BREAKER AKR-5A-50 W/SST TRIP DEVICE
GE AKR-4A-30 800A FRAME LOW VOLTAGE POWER BREAKER
GE AKR-6D-50 1600 A Amp Air Breaker NO TRIP 635V
GE AKR-10D-125 5000 A Amp Breaker MVT Plus Trip 635 V
UNUSED GE TR8S400 400A RATING PLUG FOR AKR BREAKER
GE 1600 AMP CIRCUIT BREAKER AKR-3A-50 635V W/SENSOR
GE AKR-7D-50 1600 A Amp Air Breaker AC RPO LSIG EO
GE AKR-6D-30H 800 A Amp Air Breaker Versa Trip LSG 635V
10 UNUSED GE TR8S400 400A RATING PLUG FOR AKR BREAKER
GE AKR-6D-30H 800 A Amp Air Breaker Versa Trip LSG 635V
GE AKR-6D-50 1600 A Amp Air Breaker MVT Trip LI 635 V
GE AKR-6D-50 1600 A Amp Air Breaker MVT Trip LSIG 635 V
GE AKR-6D-50 1600 A Amp Air Breaker Versa Trip LSG 635V
GE AKR-6D-30H 800 A Amp Air Breaker Versa Trip LSG 635V
GE AKR-10D-75 3200 A Amp Air Breaker MVT Plus Trip 635V
GE AKR-7D-75 3200 A Amp Low Voltage Air Breaker 635 V
GE AKR-10D-100 4000 A Amp Low Voltage Air Breaker 635V
GE AKR-7D-50 1600 A Amp Air Breaker RMS-9 MVT LS 635 V
