Fender MX-5200
A Fender-badged eight-channel-input console whose real story is in its service manual - 100mm faders, a fan that only wakes up when the power supply gets hot, and solder-pad jumpers you cut with an iron to reroute your aux sends.
Overview
The surviving documentation for the Fender MX-5200 shows a modular, serviceable, eight-channel-input mixing console built around slide faders and a discrete-component power supply. It was designed to be opened, traced and repaired rather than replaced. The parts lists in the factory manual read like a technician's inventory: 100mm 10kA slide controls as channel faders, custom double-shot knobs color-coded by function - gray/blue for Aux and Monitor controls, gray/green for EQ, gray/dark-gray for Pan, gray/white for Trim - and gray square buttons for the Mute and Solo switches. The color coding survives in the documentation even where the panels themselves have long since gone missing.
The input panel carries eight channel faders, thirty-two EQ knobs across the eight channels, and eight trim controls. That lines up with an eight-channel-input architecture feeding a bus structure. The output/master panel is a different animal: six slide controls, main faders capped in red/black and Sub 1-4 faders in white/black, plus Return Level, Aux Level, Monitor Level, Return-to-Monitor Level, Solo, Control Room, Headphones, and Mono Level pots. A 1000µF/6.3V cap appears eight times across the input board, and the output board carries forty-three 10µF/50V electrolytics. Nobody skimped on decoupling here.
The power supply is the most interesting part of the MX-5200. The Rev "A" and Rev "B" power supply assemblies share the same capacitor lineup - two 15000µF/35V reservoir caps, a 6800µF/35V, a 2200µF/100V, four 100µF/100V, and a 1000µF/35V. The Rev "B" board swaps in TIP142 and TIP147 power transistors (five NPN TIP142s, three PNP TIP147s) alongside a 2N4401, a 2N5401, and a 2N4403 for the small-signal work. The Rev "B" supply also carries a thermal switch rated to close at 194°F, wired to kick the 3-1/8" 120V fan from low to high speed, plus a 10-ohm 5A thermistor. So the fan does not run flat-out all the time. It stages up when the supply actually gets hot.
The aux routing is configurable, and the factory default is unusual. Aux 1/3 ships as post-EQ/post-fader. Aux 2/4 ships as pre-EQ/pre-fader. Internal jumpers - PX3, PX4, and PX5, three adjacent solder pads sitting right next to the Monitor Pre/Post switches - let a technician change that to post-EQ/post-fader or post-EQ/pre-fader across all four sends, or pre-/post-fader across all four. The manual is explicit that the pads are reachable from the solder side of the board, so the panel does not have to come out. Changing the configuration means cutting a small connecting trace and bridging the pads you want with solder. That makes it easy to service, and it also means any MX-5200 you find today may or may not still be in its factory routing.
One detail in the mute circuit matters for live use. When a channel's Mute switch is engaged, the post-EQ/post-fader signal is muted, but the pre-EQ/pre-fader signal is not. That is deliberate, so a muted channel can still be cued in the PFL solo system. The Monitor 1 and Monitor 2 sends are switch-selectable between pre-EQ/pre-fader and post-EQ/post-fader, and internal jumpers can change that to post-EQ/pre-fader or post-EQ/post-fader.
The console is built as three main assemblies - an input panel, an output/master panel, and a separate power supply chassis. The power supply connects to the mixer by an interconnect cable, and a second cable runs from the PCB assembly to the rear of the chassis. The power supply chassis carries an IEC AC inlet. Panel removal is documented step by step: pull the top trim piece above the rear patch bay, remove two flathead screws at the top of the panel, slide the panel toward the patch bay until the lower edge clears its retaining slot, lift it an inch, then raise the fader end to near-vertical and prop it with a support stick "similar to the hood of an automobile."
The output I/O board carries fourteen closed-circuit stereo phone jacks and seventeen open-circuit stereo phone jacks, a dual vertical PC-mount phono jack, and four XLR male connectors. The input board is dense with film and ceramic caps - 100pF, 220pF, 47pF, and 10pF ceramics, .0033µF metalized film and .1µF ceramic disc - alongside the electrolytics. There is a 14-pin DIP socket trio on the output board, and the reference designator scheme uses X, Y, and Z suffixes to indicate channels 1-4, 5-6, and 7-8 respectively.
The surviving documentation does not establish production years, original list price, or contemporary review reception. The manual is dated only by its revision letters, and the period magazine material from the mid-1990s does not name the MX-5200 directly. Mix (1995, p.147) ran a console comparison table listing Allen & Heath, Amek, and other desks of the era but not this Fender, and Mix (1995, p.281) covered the Crest Century Series GTx rather than anything from Fender's line. What the manual does show is an eight-channel-input console with four aux sends, four sub groups, a stereo main output, and a discrete-component power supply with staged fan cooling.
The practical checks on an MX-5200 are the usual ones for a console of this vintage. Start with the electrolytics. There are a lot of them, and the 15000µF reservoir caps in the supply either hold up or they don't. The slide faders are 100mm 10kA parts, and if a fader is scratchy or dead, that is usually a replacement job rather than a repair job. The thermal switch and thermistor in the supply can fail quietly and leave the fan running at low speed forever, which is not catastrophic but is worth checking. The aux jumpers may also have been modified by a previous owner. The manual's instructions are clear enough to verify the current configuration against the schematic.
None of this is a knock on the MX-5200. It is a console that was built to be serviced, documented to a standard most modern gear never approaches, and designed with enough configurability that it could be adapted to different rooms without a soldering iron touching anything but three small pads. That is a specific kind of engineering virtue, and it is the kind that tends to keep gear alive long after the manuals go missing.
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