JRCS SMS-22 SGD-640 LCD Graphic Terminal – Alarm & Monitoring System Display (SGD-640-AF / SGD-640-AB / SGD-640-A Series)

Product Information

Manufacturer	JRCS – Japan Radio & Electric Mfg. Co., Ltd. (Japan)
System	SMS-22 Alarm & Monitoring System (JMC-SMS-22)
Product Type	LCD Graphic Terminal (operator display / HMI panel)
Type (nameplate 1)	SGD-640-AF
Serial No. (nameplate 1)	LDIH060557
Type (nameplate 2, rear of unit shown)	SGD-640-AB (small label, low resolution – reading not fully certain)
Serial No. (nameplate 2)	2011.05.05
Power Supply	DC 24V, 50W (as marked on SGD-640-AF nameplate)
Class Approval (front label)	NK Type Approved No. 94A118 – JMC-SMS-22
Rear Panel	FG / E earth terminals, DC24V IN (– / +) terminal block, POWER ON/OFF switch, 10A fuse, MD connector (15-pin D-sub), HC connector (9-pin D-sub), card slot
Condition	Refurbished
Country of Manufacture	Japan (Not clearly visible in the supplied photograph)
Supplier	SM MARINE SERVICE™, Chattogram, Bangladesh

Product Introduction

The JRCS SGD-640 LCD Graphic Terminal is the operator display used with the JRCS SMS-22 Alarm & Monitoring System (JMC-SMS-22) on board merchant ships. It is installed in the engine control room and, in many vessels, on the bridge or in engineers' accommodation, where it shows machinery alarm lists, graphic mimic pages, trend values and system status from the SMS-22 network.

SM MARINE SERVICE™ (https://www.smmarineservice.com/) supplies refurbished JRCS SGD-640 graphic terminals and related SMS-22 spare parts to ship owners, ship managers and repair yards worldwide. The SGD-640 family includes several versions – for example SGD-640-A, SGD-640-AF, SGD-640-AB, SGD-640-N2, SGD-640-N3, SGD-640-X3C, SGD-640-X4B and larger 15-inch versions such as SGD-640-X4G-2A – so please always send us your nameplate photo for an exact match.

What Is This Equipment?

The SGD-640 is a panel-mounted LCD graphic terminal. In the SMS-22 system, field signals (temperatures, pressures, levels, running/stop and alarm contacts) are collected by local units and the CTA unit, and the graphic terminal presents this information to the engineer. Through the terminal the duty engineer can see and acknowledge alarms, view group and point lists, and check analog values for the main engine, auxiliary engines, boilers, pumps, tanks and other machinery.

The SGD-640 series exists in different sizes and hardware revisions. The unit shown in our photographs is a compact black-housing terminal with the JRCS logo and red line on the front bezel, a protected front access cover and the "NK Type Approved No. 94A118 JMC-SMS-22" label. JRCS also produced larger SGD-640 versions with a 15-inch LCD for the same family of monitoring systems.

Main Features

• Dedicated LCD graphic display for the JRCS SMS-22 alarm and monitoring system
• Shows alarm lists, mimic graphics, measured values and system status
• 24V DC ship's supply with on/off switch and 10A fuse on the rear panel
• Separate FG / E earth terminals for proper marine grounding
• MD (15-pin) and HC (9-pin) D-sub connectors for system communication and peripheral connection
• Card slot on the rear housing (used for a memory/program card in this family – function to be confirmed per unit)
• Ventilated metal housing for flush/panel mounting in console
• NK (ClassNK) type approved as part of JMC-SMS-22
• Made by JRCS, a well-known Japanese marine automation manufacturer

JRCS SGD-640 LCD Graphic Terminal (front) – SMS-22 Alarm & Monitoring System, NK Type Approved 94A118

Main Technical Specifications

Model / Type	SGD-640-AF (also SGD-640-AB, SGD-640-A and other SGD-640 versions)
System	JRCS SMS-22 / JMC-SMS-22
Display	LCD graphic display (size depends on version; 15-inch versions exist in the SGD-640 range)
Power Supply	24V DC
Power Consumption	50W (SGD-640-AF nameplate)
Protection	10A fuse on rear panel
Interfaces	MD port (15-pin D-sub), HC port (9-pin D-sub)
Grounding	FG and E terminals
Approval	NK Type Approved No. 94A118
Resolution / Dimensions / Weight	Not verified – please ask us with your nameplate

Inside the Unit: PCBs, Modules & Part Numbers

JRCS does not publish a public parts list for the SGD-640 graphic terminal, and no PCB numbers are visible in the supplied photographs. Based on the design of this type of terminal and on market listings, the following internal assemblies are present. Board codes below are given only where we found them in a source; everything else is marked "Not verified".

Main CPU / Controller Board

Runs the terminal software, draws the graphic pages and handles communication with the SMS-22 system. PCB number: Not verified.

Display Interface / LCD Driver Board

Drives the LCD panel and backlight. PCB number: Not verified.

Power Supply Unit (24V DC input)

Converts the 24V DC ship's supply to the internal voltages for the CPU and display. Several suppliers list the SGD-640-AF as "graphic terminal panel power supply DC24V 50W". PCB number: Not verified.

I/O and Communication Interface Board

Connects the MD (15-pin) and HC (9-pin) ports to the CPU. PCB number: Not verified.

LCD Panel and Backlight Inverter

The LCD module and its backlight (CCFL inverter on older versions). Panel part number: Not verified.

Memory / Program Card

The rear card slot is used for a program/memory card in this family. Related JRCS graphic memory card numbers found on the market are GDT-M302B-1 and GDT-M302B-2 (compatibility with SMS-22 SGD-640: Not verified).

Other Codes Seen on SGD-640 Units

The code SGD-ME-FL2 appears on several SGD-640 terminals offered on the market (exact function: Not verified). Some SGD-640-N2 units show the software label "SGD-640AF V1.1".

Tip: If one board in your terminal fails, send us a clear photo of the board label – SM MARINE SERVICE™ can check the exact PCB number against our stock in Bangladesh and China.

Main Components & Related Units

• SGD-640-A / SGD-640-AF / SGD-640-AB – LCD graphic terminals for SMS-22
• SGD-640-N2, SGD-640-N2E, SGD-640-N3 – later SGD-640 graphic terminal versions
• SGD-640-X3C, SGD-640-X4B – SGD-640 graphic terminal versions
• SGD-640-X4G-2A, SGD-640-X4G-3, SGD-640 X20-88075 – 15-inch LCD versions
• SMS-U500, SMS-U500-1, SMS-U500-10 – CTA Unit, SMS-22 Alarm & Monitoring System
• SMS-U650A-11 – Local Unit, SMS-22 Alarm & Monitoring System
• SMS-U19A-17L-3 – JRCS LCD graphic terminal (related JRCS monitoring system)
• SMS-32 / SMS-U920 – newer JRCS alarm monitoring and control system (related family)
• GDT-M302B-1 / GDT-M302B-2 – JRCS graphic memory cards (compatibility Not verified)

Marine & Industrial Applications

• Engine control room alarm and monitoring display
• Bridge and accommodation alarm display (where fitted)
• Bulk carriers, tankers, container ships, general cargo and car carriers built in Japanese, Korean and Chinese yards
• Unmanned machinery space (UMS / M0) alarm monitoring
• Replacement for failed or damaged SMS-22 graphic terminals during repairs and dry dock

Rear view: DC24V IN terminals, POWER switch, 10A fuse, MD and HC connectors and SMS-22 nameplate

Nameplate: JRCS SMS-22 Alarm & Monitoring System – LCD Graphic Terminal Type SGD-640-AF, DC24V 50W

Common Problems & Troubleshooting

• Blank or dark screen: check the 24V DC supply at the terminal block, the POWER switch and the 10A fuse. A dim but working screen often points to an aged backlight or inverter.
• No communication / data not updating: check the MD/HC connectors and cables, and the status of the CTA unit and network.
• Lines, spots or flicker on display: usually a failing LCD panel, display cable or driver board.
• Unit restarts or freezes: check the supply voltage under load, cooling vents and the internal power supply unit.
• Overheating: keep ventilation slots clean and free from dust.

Safety note: Always isolate the 24V DC supply before opening the unit or disconnecting cables. Inform the duty engineer, because the alarm display will be out of service. Work should be done by qualified personnel only, following the ship's procedures and the maker's documentation.

Common Alarms

Alarm codes and messages for the SGD-640 terminal are documented in the JRCS SMS-22 instruction manual for each ship. We do not publish undocumented alarm codes. Please check your vessel's manual or contact us with a photo of the message shown on screen.

Maintenance Tips

• Clean the screen with a soft dry cloth – no solvents.
• Keep ventilation openings clean; check for dust during regular maintenance.
• Check tightness of the DC24V terminals and earth (FG/E) connections.
• Check D-sub connectors (MD/HC) for loose screws and corrosion.
• Keep a spare terminal or spare boards on board for older SMS-22 installations.

Spare Parts & Replacement Availability

SM MARINE SERVICE™ supplies refurbished JRCS SGD-640 LCD graphic terminals and SMS-22 alarm and monitoring system spare parts. For a fast and accurate quotation, please send:

• Clear photo of the nameplate (Type, e.g. SGD-640-AF / SGD-640-AB, and Serial No.)
• Photo of the front and rear of your unit
• Board/PCB number if you need a single board
• Vessel name/IMO (optional) and delivery port

We ship worldwide by courier and air freight. Availability and condition are confirmed at the time of quotation.

Why This Equipment Is Still Used

The JRCS SMS-22 system was installed on a large number of ships, and it still performs reliably. Replacing a full alarm and monitoring system means new cabling, software and class approval, which is expensive. Replacing only the failed SGD-640 graphic terminal with a compatible refurbished unit keeps the vessel running at much lower cost and with very short downtime.

FAQ

1. What is the JRCS SGD-640-AF?
It is an LCD graphic terminal for the JRCS SMS-22 alarm and monitoring system, powered by 24V DC, 50W.

2. Which system does the SGD-640 belong to?
The units shown are labelled SMS-22 / JMC-SMS-22 Alarm & Monitoring System by Japan Radio & Electric Mfg. Co., Ltd. (JRCS).

3. Are SGD-640-A, SGD-640-AF and SGD-640-AB interchangeable?
Not always. Versions can differ in hardware and software. Send us your nameplate so we can match the exact type.

4. Do you have the larger 15-inch SGD-640 version?
Larger SGD-640 versions (e.g. SGD-640-X4G-2A) exist. Please ask us for current availability.

5. Can you supply individual PCBs for the SGD-640?
Yes, subject to availability. Send a photo of the board and its PCB number.

6. What PCB numbers are inside the SGD-640?
JRCS has not published a public parts list. No PCB numbers are visible in our photographs, so please send us the number printed on your board for checking.

7. What is the GDT-M302B memory card?
GDT-M302B-1 and GDT-M302B-2 are JRCS graphic memory cards seen on the market; compatibility with your SGD-640 must be confirmed.

8. What power supply does it need?
24V DC; the SGD-640-AF nameplate states 50W.

9. What are the MD and HC connectors?
They are the rear communication/peripheral ports (15-pin and 9-pin D-sub). Exact pin use is in the SMS-22 manual.

10. Is the unit class approved?
The front label shows NK Type Approved No. 94A118 for JMC-SMS-22.

11. Do you also supply the SMS-U500 CTA unit and SMS-U650A local unit?
Please contact us with your part number – we source SMS-22 system units on request.

12. Do you ship worldwide?
Yes, SM MARINE SERVICE™ ships worldwide from Bangladesh and China.

Short Product Description

The JRCS SGD-640 LCD Graphic Terminal (types SGD-640-AF, SGD-640-AB and other SGD-640 versions) is the operator display of the JRCS SMS-22 / JMC-SMS-22 Alarm & Monitoring System made by Japan Radio & Electric Mfg. Co., Ltd. It runs on 24V DC (50W on the SGD-640-AF nameplate) and shows machinery alarms, graphic mimics and measured values in the engine control room. The rear panel has DC24V input terminals, a power switch, a 10A fuse and MD and HC D-sub connectors, and the front label shows NK Type Approval No. 94A118. SM MARINE SERVICE™ supplies refurbished units and SMS-22 spare parts with worldwide shipping.

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SM MARINE SERVICE™ – Marine Automation & Navigation Equipment Supplier

Available Equipment Conditions: New • Used • Refurbished • Reconditioned (Specific product condition and availability are subject to confirmation.)

Stock Locations: Bangladesh • China

Services: Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: https://www.smmarineservice.com/

Need a JRCS SGD-640 LCD graphic terminal or SMS-22 spare part? Send us your nameplate photo today for a fast quotation.

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