⚙️ Product Description

The General Electric DS3800HLOC1A1B is a Logic Output Board for the GE Mark IV Speedtronic turbine control system. The HLOC board is designed for logic-level output functions within the Mark IV control architecture. The board features a rear-edge backplane connector, two extractor clips, multiple board stiffeners, and a front-edge indicator section containing 16 red LEDs and 1 yellow LED, together with a switch. The PCB also contains integrated circuits, diodes, resistors, and capacitors. The exact output assignments and system wiring are application-dependent, so the complete part number and board revision should be matched with the original installation before replacement.

📋 Product Datasheet

🔧 Functional Features

• Designed specifically for the GE Mark IV Speedtronic control platform.

• Provides logic output circuitry for compatible Mark IV system applications.

• The front edge contains a dedicated status-indicator array with 17 LEDs: 16 red and 1 yellow.

• A rear-edge backplane connector provides the board’s connection to the Mark IV rack and control system.

• Two extractor clips assist with board removal and installation.

• Multiple stiffeners reinforce the PCB for rack-mounted industrial service.

• Exact output channel assignments should be confirmed from the applicable Mark IV system documentation rather than inferred solely from the board number.

❓ FAQ

Q: What is the GE DS3800HLOC1A1B?

A: It is a General Electric Mark IV Speedtronic Logic Output Board with the functional acronym HLOC.

Q: What does the HLOC board do?

A: It provides logic-level output functions within compatible Mark IV control-system configurations. The specific output assignments are system-dependent.

Q: How many LEDs are on the board?

A: The documented board configuration has 16 red LEDs and 1 yellow LED, for a total of 17 front-edge LEDs.

Q: Does the board have a backplane connector?

A: Yes. The board has one rear-edge backplane connector for connection to the Mark IV system rack.

Q: Can DS3800HLOC1A1B replace another HLOC board?

A: Replacement should be based on the complete part number, revision, connector arrangement, system configuration, and original application. Do not assume all HLOC variants are interchangeable.

Q: Is this a current-production GE board?

A: It is a legacy Mark IV component and is generally sourced as a replacement, surplus, or refurbished industrial control part.

🛠️ Troubleshooting & Safety

• Confirm the complete DS3800HLOC1A1B marking before installation.

• Compare the replacement board’s LED arrangement, switch, connector, extractor clips, and component layout with the original.

• Verify output channel assignments and wiring against the applicable Mark IV documentation.

• Inspect the backplane connector for bent contacts, oxidation, contamination, or mechanical damage.

• Check the front-edge LEDs and associated circuitry when troubleshooting output-status indications.

• De-energize the Mark IV cabinet and follow site lockout/tagout procedures before removing or installing the PCB.

• Use appropriate ESD protection when handling the exposed circuit board.

• Do not apply external signals or power to the board until the system wiring and connector assignments have been verified.

⭐ Recommended GE Mark IV Models

1. DS3800HLIA1A1B — Logic Input Board
2. DS3800HLEA1B1B — Logic Element Card
3. DS3800HLOA1D1B — Logic DR Bus Interface Board
4. DS3800HLOA1E1C — Logic DR Bus Interface Board
5. DS3800HLSC1C1B — Data Link Control Board
6. DS3800HLSD1A1A — Data Link Slave Board
7. DS3800HLXA1C1E — High-Speed Data Link Board
8. DS3800HLXB1B1C — Link Master Transmit/Receive Board
9. DS3800HLIC1A1A — Group Isolated Logic Input Board
10. DS3800HITA1E1E — I/O Control Board
11. DS3800HIOA1B1A — Input Isolator Board
12. DS3800HIOD1G1E — Digital Input/Output Board
13. DS3800HMPF — Microprocessor Board
14. DS3800HMCA1B1A — Dual Communication Control Board
15. DS3800HSPC — Speed/Position Input Board