Changes
drive speed adjustment
* Head and drive motors changed for 5V version.
* Main PCB (Z80425) slightly smaller than EME-156 V one. It cannot be fully removed without de-soldering some wires or un-mounting index sensor and track 0 sensor. Track 0 sensor has to be calibrated when mounted.
* White face to match Plus range coulorcolour.
* Minor modification of the brass chassis near the drive motor
* <span style="color:#FF0000">The write protection sensing is done using a [[Writepin|switch / pin assembly]].</span>
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== Drive maintenance ==
=== Rotation speed adjustment ===
3 inch drive spins at 300 RPM, giving a 200ms index pulse period. Rotation speed is factory adjusted, but may drift with time and cause read problem when drift is too large.
On EME 150A, the drive motor speed regulation is done on the main unit PCB, and is adjusted using VR201.
On Other model (155/156/156V/157), the drive motor includes its own regulation PCB, and adjustment is done on the motor itself.
<gallery>
File:EME-150A_RpmAdjust.jpg|EME-150 A speed adjust
File:EME-156_RpmAdjust.jpg|EME-156 A speed adjust
File:MMU-5B2LQJ_open.JPG|Detail of MMU-5B2LQJ motor speed regulator
</gallery>
Rotation speed can be checked either by monitoring the drive index pulse with an oscilloscope or by using dedicated SW like [http://www.cpcwiki.eu/forum/applications/dsktest-v0-1b/ DskTest] or [http://www.amstradtoday.com/resur/rpm.zip RMP].
== Gallery ==
