I. Model and Positioning

Model: JANCD-MB20C (Part Number is the same as MB20/B: DF8101356)

Series: JANCD → YASNAC J300 (Numerical Control) / JZNC-RK20 (Robot)

Version Evolution: MB20 (A) → MB20B → MB20C (Final Version)

Current Status: The original factory has discontinued production. The market mainly consists of disassembled / refurbished spare parts.

II. Core Improvements (Compared with MB20B)

Hardware Enhancement

Power Supply Circuit: 24V load capacity has been increased to 200mA, 10V to 30mA, with dual-channel redundant power supply.

Component Grades: Key components (rectifier bridge, capacitors, power modules) have been reduced to 2.5 times the original rating, with a temperature resistance of -40°C to +85°C.

Interference Resistance: The PCB has been re-designed, with multiple layers of ground and shielding added, significantly improving EMI/ESD performance.

Stability and Lifespan

Operating Temperature: 0 to 55°C (Version B: 0 to 50°C, Version A: 0 to 45°C).

Fault Probability: Alarm for ALM01 (Bus Error) and ALM02 (Low Battery) has been significantly reduced.

Lifespan: MTBF has been increased to 100,000 hours (Version B: approximately 60,000 hours). Compatibility

Fully compatible with all J300 daughter boards: PC20, MM20, JIF10, JSP02/04/11, etc.

Direct replacement of MB20(A)/MB20B, no rewiring required, no parameter reset needed.

III. Technical Specifications (Version C)

Power supply: DC24V ±10%, power consumption approximately 55W (slightly higher than Version B).

Backplane slots: 6 (CPU / Memory / Communication / Spindle ×2 / Reserved).

Interfaces: CN1 (24V), CN2 (5.5V battery), CN3 (MDI), CN4 (RS-232C), CN5 (I/O), CN6-CN8 (Expansion).

Battery: NEC 5.5V lithium battery (data backup, lifespan 3-5 years).

Size / Weight: Approximately 250×220×30mm, 2.6kg.

IV. Key Differences from MB20 (A)/B Table

ProjectMB20(A)MB20BMB20C

Temperature range0–45℃0–50℃0–55℃

24V load-bearing100mA150mA200mA

Interference resistanceGeneralStrongExtremely strong

ALM01 alarmCommonLessRare

Life (MTBF)3–40,000 hours60,000 hours100,000 hours

StatusOut of productionOut of productionOut of production (final version)

V. Adapter systems and typical configurations

Numerical control: YASNAC J300 lathe / machining center.

Robot: JZNC-RK20 arc welding / handling / painting control cabinet.

Standard configuration:

MB20C (motherboard) + PC20 (CPU) + MM20 (memory)

JIF10 (communication) + JSP04/JSP11 (spindle).

VI. Common alarms and handling

ALM01 (bus error): Version C rarely occurs; check that the daughter board is securely plugged in, the gold fingers are clean, and there is no oxidation on the back panel.

ALM02 (low battery): BAT light on → Replace with NEC 5.5V lithium battery.

ALM03 (CPU abnormal): Reinsert PC20, check if the 24V power supply is stable.

VII. Replacement suggestions

Prioritize Version C: Best stability and lifespan, suitable for equipment with 24-hour continuous operation.

Replacement sequence: Version C can replace Version B/A; Version B can replace Version A; Version A cannot replace Version B/C.

Spare parts status: Original factory has stopped production, market mainly offers OK after disassembly testing / refurbished with warranty.