HP/惠普 P75050 P77740 P77750 P77760 页宽打印机英文维修手册
HP/惠普 P75050 P77740 P77750 P77760 页宽打印机英文维修手册HP PageWide Pro 750 and MFP 772, 777HP PageWide Managed P75050
HP PageWide Managed MFP P77740, P77750, P77760
语言：英文维修手册+拆机手册，里面有两册是中文维修手册页数：320+1256页格式：PDF电子版AC control moduleThe AC control module performs the following functions related to the heating elements in the air flow assembly:● Low-cost voltage monitora. The voltage of the outlet, which the printer is attached, is monitored to ensure the printer remains operational, even in a low-quality-power environment. This is done by instantly shutting off heater power until the minimum voltage threshold is met. Hysteresis is included to avoid rapid fluctuations in voltage.b. This circuit generates a frequency modulated signal that is sent across the isolation barrier, and interpreted by firmware in the engine.● Isolation– Isolates the low voltage heater control signals from the high voltage AC power that is applied to the heater. This is a safety feature to ensure line transients (i.e. lightning) aren’t coupled into the low voltage system, which could cause damage to the printer or user.● AC switch– Switches AC power on/off to the heater using TRIACs.● Heating Element Configuration– Using relays, the heating element configuration is changed between series and parallel, in coordination with applied voltage. This is done to have a predictable temperature profile that is functional across the full range of worldwide voltages (90-240VAC).
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