Yamaha disklavier DS4M4 PRO Maintenance Handbook - Page 26

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7. Replacing gray-scale hammer / key shutters

Gray scale shutters replacement

Since both gray scale hammer shutters and key shutters are optical transmission type, replace-

ment might be necessary when there comes an error message with certain key numbers dis-

played during sensor calibration. Some of them might have optical transmission problem and they

might be dusty or broken for some reason.

* Key gray scale shutters

Key shutter is the assembly of white shutter base block and gray scale shutter.

Gray scale shutter is provided as service part WC368200 ( 1 / piece)

* Hammer gray scale shutters

Hammer shutter is glued on the side of the hammer shank. When you replace it, there are guide lines for both

vertical - hammer roller butt plate, and horizontal - upper edge of hammer shank.

See the drawing as shown at right bottom. Service part - WE105700 ( 4 / set)

Be careful to avoid getting fingerpronts on the shutters !

Execute piano calibration (Full) after replacing shutters. See 6-4. bottom.

* Shutter replacement procedure

KEY SHUTTER

REPLACE

SENSOR MEASUREMENT IN THE SERVICE MAINTENANCE MODE ‑ PIANO CALIBRATION (FULL)

HAMMER SHUTTER

REPLACE

MHB23 MKIV/PRO DIOV1.05, SCV.1.01 PAGE.24