1. General

• Part Numbers: JANCD‑SP20B‑01, JANCD‑SP20B‑02（commonly called SP20B）

• Manufacturer: Yaskawa Electric / Motoman Robotics

• Function: Keyboard/CRT display controller（operator panel I/F, MDI interface）

• Applicable Systems:

  • Motoman ERC robot controller

  • YASNAC LX3 / MX3 CNC（with MDT‑948B‑3 monochrome CRT）

• Status: Discontinued（only used / refurbished / surplus available）

• Origin: Japan

2. Specifications

• Power: +12 V DC（from controller backplane）

• Current: ~0.5 A

• Operating Temp: 0 °C to 55 °C

• Storage Temp: −20 °C to 60 °C

• Humidity: ≤95% RH（non‑condensing）

• Key Interfaces:

  • 20‑pin flat cable: connects to JANCD‑SP19 external keypad

  • CRT video port: drives monochrome CRT monitor

  • System bus: communication with ERC / LX3 / MX3 main CPU

3. Main Functions

• Keyboard scanning & encoding: Reads SP19 key matrix, debounces, converts to key codes

• CRT video control: Outputs text, parameters, and status to CRT display

• Front‑panel I/O: Processes mode switches, LEDs, and operator controls

• System bridge: Transfers data between man–machine devices and main controller

4. SP20B‑01 vs SP20B‑02

• JANCD‑SP20B‑01:

  • Early revision; mainly for YASNAC LX3 CNC CRT/keyboard only

  • Limited compatibility; not fully optimized for ERC robots

• JANCD‑SP20B‑02:

  • Standard Rev B version（most common）

  • Fully compatible with Motoman ERC + YASNAC LX3/MX3

  • Optimized for use with JANCD‑SP19 keypad

5. Compatibility

• ✅ Motoman ERC robots

• ✅ YASNAC LX3 / MX3 CNC（MDT‑948B‑3 monitor）

• ❌ Not compatible: XRC, NX100, DX100, DX200 and later Motoman controllers

6. Common Issues & Troubleshooting

• Keypad no response: Check 20‑pin cable, SP19 membrane, and board fuse

• Key jitter / multiple triggers: Worn SP19 keypad or scanning circuit fault

• CRT no display: Verify +12 V supply, CRT cable, and video driver circuits

• Board not recognized: Clean gold‑finger contacts; re‑seat in backplane slot

7. Installation Notes

• Power off and wait 5 minutes for capacitor discharge

• Use ESD protection（wrist strap）

• Insert into designated backplane slot and secure

• Connect SP19 flat cable and CRT monitor cable

• Power on and test keypad input, CRT display, and panel LEDs