A20B-3300-0552 Fanuc PCB Board A20B33000552 A2OB-33OO-O552

A20B-3300-0552 | FANUC A20B-3300-055x Series Module — Adjacent to GUI Module 0551 / CNC Display and Interface Function

A20B-3300-055x — The GUI and Display Module Range

The A20B-3300-055x range within the broader A20B-3300 series is anchored by the confirmed A20B-3300-0551 (GRAPHIC USER INTERFACE MODULE W/128 MB DRAM) — the dedicated GUI processor for FANUC CNC systems with advanced display and PC function capability.

The A20B-3300-0552, immediately adjacent, belongs to the same 055x range. In the A20B-3300 series, closely numbered boards consistently serve related functions within the same application category. Paired boards in this series:

• A20B-3300-0602 / 0603: 21i-B Pentium MMX modules, 16MB and 32MB variants
• A20B-3300-0635 / 0638: Axis Card A1 and A2 variants
• A20B-3300-0551 / 0552: GUI module and its 055x companion

The 0551/0552 pairing likely represents related display or GUI function boards — either different memory or specification variants, or complementary modules within the same display architecture.

Key Product Information

The GUI Architecture — Where 0552 Fits

FANUC's GUI processor architecture separates display and PC function processing from the main CNC CPU module. The A20B-3300-0551 is confirmed as the primary GUI module in this architecture — providing the 128MB DRAM workspace for display rendering, tool path graphics, and PC function applications.

The A20B-3300-0552's role within this same 055x range suggests it participates in the same display or GUI function domain:

Higher-memory GUI variant: A 0552 GUI module with more DRAM than the 0551 — serving CNC configurations with more intensive PC function software or higher-resolution display requirements.

Different platform GUI module: A GUI module matched to a specific CNC platform variant, where the 0551 and 0552 serve different hardware generations or main board configurations.

Display interface companion: A separate board within the display chain — working alongside the 0551 to provide specific display output or controller interface functions.

Confirm the exact function from the installed module's label and the applicable FANUC CNC maintenance manual.

Application Scenarios

CNC display system fault: A FANUC CNC develops display-related faults — the operator panel shows corrupted graphics or display function fails. The A20B-3300-0552 is identified from its label as the fault. Replacement restores display function.

GUI module system spare: A production facility running FANUC CNCs with 055x-range display modules stocks A20B-3300-0552 alongside A20B-3300-0551 as display system spares.

FAQ

Q1: How do I confirm A20B-3300-0552 is the correct module for my CNC?

Read the part number from the installed module's label. If it reads A20B-3300-0552, this is the confirmed replacement. Cross-reference with the applicable FANUC CNC maintenance manual's spare parts table to confirm the module's exact function.

Q2: Is A20B-3300-0552 interchangeable with A20B-3300-0551?

Both are in the same 055x range and serve related display/GUI functions. Whether they are directly interchangeable depends on whether they are variants of the same module or distinct boards with different specifications. Confirm from the hardware documentation before substituting one for the other.

Q3: Does replacing A20B-3300-0552 affect CNC parameters or programmes?

No. CNC parameters and programmes reside in SRAM and FROM modules on the CNC main board — not in GUI or display modules. Replacing A20B-3300-0552 does not affect any stored machining data.

Q4: If A20B-3300-0552 fails, does the CNC continue machining?

As with the GUI module A20B-3300-0551, a display module failure affects operator visibility but not the CNC's core machining function. The main CPU continues executing programmes and controlling servo axes. The safe approach is to allow the current programme to reach a controlled stop before addressing the module fault.