Jump to content

Mpu3 frustration!


Recommended Posts

Important to remember no two motors are necessarily the same (been there!) - if replacement motors came from a working deck, drum hub pins drifted out with relative ease and plates marked, replacement motor slot positions also need to follow motors to other plates - had a motor go stiff to point the drive is adversely affected/creates an alarm but as Nick says, very rare.

If a motor is removed from its support plate, same exact position in relation to slots needs to be replicated on new support plate, or rechecked/set as follows:

Using software that "first phase" energises reels at switch on (without spinning on initialisation - Instant Replay, NU, Spotlight etc.) ...

Tighten 4 motor screws to hold motor secure on plate but still allow adjustment in slots on plate (with drum fully tightened to hub using 3 hub screws).

Connect a loose reel driver/back board to MPU with red (15-way) cable and connect reel motor to driver/back board with white connector (A,B or C header position).

Power on and motor will energise to nearest of 12 "first phase" positions - rotate drum by hand through the first phase 'steps' until indexing hole is closest to sensor.

Fine tune by rotating motor in mounting plate slots until drum indexing hole in centred over sensor - fully tighten 4 motor mounting screws to lock in slots.

Power off and move drum by hand to another position and repeat power on process above to recheck locked position remains accurate.

 

Given the coloured AMP connector solder joints are often approaching 40yrs as Peter says, can fail at random/during this process and throw you off.

  • Like 2
Link to post
Share on other sites
10 hours ago, paulgee said:

Important to remember no two motors are necessarily the same (been there!) - if replacement motors came from a working deck, drum hub pins drifted out with relative ease and plates marked, replacement motor slot positions also need to follow motors to other plates - had a motor go stiff to point the drive is adversely affected/creates an alarm but as Nick says, very rare.

If a motor is removed from its support plate, same exact position in relation to slots needs to be replicated on new support plate, or rechecked/set as follows:

Using software that "first phase" energises reels at switch on (without spinning on initialisation - Instant Replay, NU, Spotlight etc.) ...

Tighten 4 motor screws to hold motor secure on plate but still allow adjustment in slots on plate (with drum fully tightened to hub using 3 hub screws).

Connect a loose reel driver/back board to MPU with red (15-way) cable and connect reel motor to driver/back board with white connector (A,B or C header position).

Power on and motor will energise to nearest of 12 "first phase" positions - rotate drum by hand through the first phase 'steps' until indexing hole is closest to sensor.

Fine tune by rotating motor in mounting plate slots until drum indexing hole in centred over sensor - fully tighten 4 motor mounting screws to lock in slots.

Power off and move drum by hand to another position and repeat power on process above to recheck locked position remains accurate.

 

Given the coloured AMP connector solder joints are often approaching 40yrs as Peter says, can fail at random/during this process and throw you off.

Nice bit of info their Paul, when it’s broken into simple terms it all makes perfect sense!

Thank you 👍

Link to post
Share on other sites
  • 3 months later...
×
×
  • Create New...