The Grass Valley NV8500 and NVision router family are the backbone of dozens of broadcast studios worldwide. This guide explains how the system is built up, which modules perform which function, and where you can find original spare parts now that Grass Valley no longer supplies this line.
The Grass Valley NV8500 is a modular SDI video router available in various configurations — from small systems to large multi-frame routers with configurations ranging from 64x64 to 576x576. The system is built around a central frame (chassis) into which input and output modules are inserted.
The strength of the NV8500 system lies in its hot-swap modularity: individual boards can be replaced without shutting down the system. This made the system extremely reliable for 24/7 broadcast environments — and it is also why so many installations are still running today.
Originally developed by NVision and later integrated into the Grass Valley portfolio, the NV8500 became one of the most widely deployed SDI router platforms in broadcast facilities worldwide. Introduced in the mid-2000s, Many installations from that period are still running today — more than 20 years later. The modular design makes maintenance and repair relatively straightforward when the right parts are available.
EMO (Electrical Module Output) boards are the output cards of the NV8500. Each EMO board handles a certain number of SDI outputs. The most common are the EMO-783, EMO-785, EMO-814 and EMO-819.
The NV9000 System Controller handles routing decisions, communication with control panels and redundancy switching. A faulty System Controller is critical — but replaceable if the correct board is available.
Power supplies are the most commonly replaced components in a router of this age. The NV8500 uses redundant power supplies so that one faulty PSU does not cause a failure — but both must be functional for full redundancy.
Grass Valley has officially declared the NV8500 and the broader NVision router family EOL. This means Grass Valley itself no longer supplies spare parts for this system. For broadcasters wishing to continue operating their NV8500, there are now two sources for spare parts: the second-hand market and specialist dealers such as MOZCAN who have actively built up EOL stock.
The practical impact on your installation depends on your specific configuration. Large routers with plenty of redundancy have more margin: one faulty board is not a crisis. Smaller installations without redundancy are more vulnerable — here it is wise to keep critical modules in reserve.
Recommendation for NV8500 administrators: make an inventory of your critical boards (controller, power supplies, busiest output modules) and establish a minimum reserve. One set of spare modules is a fraction of the cost of a new router installation.
MOZCAN has a selection of original NV8500 and NVision router modules in stock. All parts come from controlled sources — decommissioned or replaced installations at European broadcasters — and are tested before shipping.
Do you need a specific part that is not in our online list? Get in touch — we have more in stock than is visible online, and we have a network of partners with whom we can trace rare parts.
→ View all Grass Valley spare parts in stock
Router gives no signal on specific output. First check the EMO output board for those specific outputs. Swap with an identical board to isolate the problem. If the new board works, the original board is faulty.
Controller does not respond or does not boot correctly. Check the power supply to the controller slot and the connections. System Controller failures are less common than PSU failures but can have a significant impact — keep a spare board if your installation is mission-critical.
Intermittent signal interruptions. Often caused by PSU instability, oxidised connectors, a defective output board or inadequate cooling — not typically a crosspoint card failure. Swap the EMO output board for the affected outputs to isolate the fault.
Power alarm but system is still running. Probably one of the redundant power supplies is faulty. Replace quickly — if the second one also fails, the system goes offline.
Send us the module number — we check the availability immediately.