This paper gives a detailed analysis of the principle of the phase lock circuit, one of the most important parts of the QF1052B Standard Signal Generator and provides some methods of checking it.

本文详细分析了QF1052B型标准信号发生器锁相环部分的基本组成及其工作原理，并提出了对此部分电路的检测方法。

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Rather than pay for the full fix itself, which requires a new circuit board for every affected lock, Onity has asked its hotel customers to cover the cost of those hardware replacements.

FORBES: Security Flaw In Common Keycard Locks Exploited In String Of Hotel Room Break-Ins

As communicated in the July 30 Franchise Weekly Update , a hacker claims to have compromised the Onity brand guestroom lock system with a device containing a circuit board with several wires attached.

FORBES: Lock Firm Onity Starts To Shell Out For Security Fixes To Hotels' Hackable Locks