• Index & Warnings PS 2500 Opening Instructions - KeyboardDisassembling GPS 2500 Opening Instructions - Keyboard Disassembling PS 2500 Cabinet Assembly 1 PS 2500 Stand & Controls Assembly 2 GPS 2500 Cabinet Assembly Block Diagram Power Amplifier & Supply, Phones, Cross Over and Control & Midi I/O Schematic Diagrams Power Aamplifier. • Remove the two locking plates (A) from the sides. PS2500 - To Open the Instrument Remove the keyboard cover (slide it through the lateral guides). To unlock the controls panel unscrew the three screws (B). Disconnect the instrument from the mains. Unscrew the four screws at the rear of instrument. • To easy access to the internal circuitry, you must remove the controls panel.

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On Mason & Hamlin upright pianos the serial number can be located on the cast iron plate when you open the lid. This will be stamped on the plate of the piano. If you do not find the serial number in this location, look for an oval opening in the plate – just left of the center of the piano. Mason hamlin pump organ serial numbers. The company was renamed Mason & Hamlin Organ & Piano Co. It was founded by Henry Mason and Emmons Hamlin with funds provided by Oliver Ditson and Henry's father, Lowell Mason. They built about 450 organs per year from 1855-1861. Use the following chart of Mason & Hamlin serial numbers to help determine the age of your piano. The serial number of your Mason & Hamlin piano can be found in several locations, depending on what model of Mason & Hamlin you are trying to date. Mason & Hamlin Serial Number Locations 1. Model B, A, AA and BB grand pianos. First, sit at your piano like you are playing it. Then look into the piano plate and to the left of the centre of the piano.

Unscrew the three screws (A), disconnect the three grounding jumpers (B), GPS2500 - To Open the Instrument pull the controls panel toward you and raise it. Disconnect the instrument from the mains. Lift the cover and unscrew the three screws (A). To install the optional accessories it is not necessary to disconnect other Remove the protection panel by lifting it from the rear (B). • View A View B CONTROLS PANEL (see next page) AUDIO/VIDEO INTERFACE BOARD HARD DISK BRACKET View A View B HARD DISK AUDIO/VIDEO INTERFACE BOARD & H. SUPPORT TWEETER TWEETER SUPPORT DISK DRIVE GROUP SUPPORT 3.5' DISK DRIVE DISK-DRIVE SUPPORT CPU &.

• COVER KEYBOARD COVER CABINET SPEAKER BOX LEFT SIDE LEG RIGHT SIDE LEG MUSIC STAND PEDAL CROSS-BAR TRIPLE PEDAL ASSEMBLY AC-DC ADAPTER SCREEN CONTROL PANEL INTERFACE BOARD BOARDS SUPPORT DIAL KNOB SLIDER POTENTIOMETER KNOB SLIDER POTENTIOMETER FRAME RED FELT (1230x12x1.5) RIGHT CONTROLS PANEL BOARD LEFT CONTROLS PANEL BOARD SLIDERS BOARD.