Customer: shenzhen longgang a second-hand printer business

Brand: Heidelberg

Power: 37 kw / 380 v inverter

Fault phenomenon: after press start inverter show abnormal, can‘t operate.

Barrier analysis: this printer for more old-fashioned inverter terminal connections, Heidelberg control section for Fuji PLC control. Open the power inverter high voltage LED indicator, main control board on the LED indicator is on, the inverter switch power supply is normal. Dc voltage on the main board and main control board is like normal (5 v, 10 v, 15 v, 24 v). Later detected using oscilloscope main control board, found that there is a chip HC245 with input voltage and signal, without output signals, may be it is damaged

The cause of the problem: the printer using time is longer, after a lot of disassembling and component aging, main control board chip HC245 damage.

Troubleshooting: replace aging capacitance and the mainboard chip HC245 can.

Hong wei repair service hotline: 0755-28916839, 13640994287, Mr. Shaw