Mitsubishi Elevator KCZ-910B (YX401B062A-01) Voice Annunciation System Board

KCZ-910B (YX401B062A-01) is commonly used in Mitsubishi elevator voice announcement and passenger information systems.

This board is generally associated with:

• floor voice announcement
• arrival indication
• passenger voice prompts
• elevator audio communication
• COP information systems

Usually installed inside the elevator control cabinet or audio communication assembly.

A Typical Issue Found During Inspection

In some older Mitsubishi elevators in Thailand and Hungary, voice announcement problems may gradually appear after long-term operation, especially in commercial buildings with continuous daily use.

Typical situations may include:

• intermittent floor announcements
• distorted speaker sound
• delayed voice response
• missing arrival prompts
• unstable audio playback

During troubleshooting work, technicians sometimes inspect the voice board together with the speaker module and communication wiring.

What Technicians Inspect Next

The voice announcement board commonly works together with:

• floor display systems
• communication boards
• COP modules
• audio amplifiers
• controller signal circuits

If communication signals become unstable, voice synchronization with floor indication may also be affected.

Some Mitsubishi systems use different voice modules depending on controller generation and language configuration.

Why Voice Systems Become Unstable

In older elevator systems, voice announcement instability may be related to:

• aging electronic components
• speaker degradation
• unstable communication signals
• connector oxidation
• cabinet humidity conditions

Because of this, some modernization projects replace both the announcement board and speaker assembly during refurbishment work.

FAQ

Why does the elevator stop announcing floor information?

In some Mitsubishi systems, unstable communication signals or aging audio boards may affect voice announcement response.

Can communication problems affect voice synchronization?

Yes. If signal transmission becomes unstable, the voice system may not synchronize correctly with floor indication and arrival status.

Maintenance Reminder

Before replacement:

• board version should match original controller configuration
• audio connector layout must be confirmed
• speaker wiring should be checked carefully

Some Mitsubishi voice systems use similar PCB structures with different language or communication settings.