Bisque Paramount ME Manuale per l'uso e la cura

Revision 2.0

Paramount ME Homing Sensor Replacement and

Troubleshooting

This document describes how to access and remove the Paramount ME’s right ascension

and declination axis homing sensors.

The Paramount ME’s homing sensors work similarly to the optical sensors on automatic

garage door openers. While a garage door is closing, a break in the light path of the

optical sensor that is mounted near the floor causes the motor to reverse directions.

Likewise, as the right ascension and declination axes rotate during the homing process, a

strip of aluminum machined into the mounts internal gearing breaks the homing sensor’s

optical path so that the control system knows the axis is at a fixed orientation, called the

home position.

During the homing process, if the homing sensor on either axis is not functioning, the

control system cannot find the home position and will continue slewing until a limit

position is reached. At that point, the control system detects an error condition and

begins to beep continuously.

Failure to locate the home position can be caused by:

Any physical barrier, most commonly excessive grease after lubricating the

mount, blocking the optical sensor. Remove the impediment by cleaning the

homing sensor to restore functionality. See “Cleaning the Optical Sensor” on

page 10 for details.

The homing sensor cable connector becomes unseated or dislodged from the

MKS 4000 main electronics board and must be reseated.

Broken, damaged or shorted homing sensor wiring. The cables can be repaired,

or a replacement homing sensor cable assembly can be purchased from the

Software Bisque Store:

http://www.bisque.com/sc/shops/store/MKS4000HomingSensorCable.aspx

Most uncommonly, the optical sensor fails and needs replaced.

Required Tools

1 –3/32 inch T-handle hex wrench

1 –5/32 inch hex wrench

1 –7/64 inch hex wrench

1 –9/64 inch hex wrench

1 –1/8 inch hex wrench

1 –Needle nose pliers

1 –Masking tape

Revision 2.0

Figure 1: Start with Paramount ME in this orientation.

Tighten the right ascension knob to free the RA axis (holding on to it!) and position it on

one of the two hard stops as shown above. Back the RA knob off until the worm and

gear are again meshed to hold it in place. This position ensures that the index on the gear

will not interfere with the sensor.

Declination Motor Cover Removal

Figure 2: Remove these five socket head cap screws.

Using a 5/32-inch hex wrench, remove the two 5/32-inch socket head cap screws in

Figure 2. Using a 1/8-inch hex wrench, remove the three remaining socket head cap

screws.

Removing the declination cover reveals the declination motor. At this point, we

recommend also removing the back portion of the declination cover to make removing

the declination motor assembly simpler.

5/32 in. hex wrench

Use 1/8 inch hex

wrench

Revision 2.0

Before proceeding, place a piece of masking tape over the cable access hole in the

declination housing to prevent the socket head cap screws from falling inside.

Figure 3: Cover the cable access hole (inside the red circle on the photo) with masking tape to

prevent screws from falling in.

Once the motor wire access hole is covered with tape, use the 3/32 inch T-handle wrench

to remove the seven 3/8 inch socket head cap screws as shown in Figure 4.

Declination axis motor

Declination axis

balance knob

Access hole

Revision 2.0

Figure 4: Removing the back portion of the declination worm block cover.

IMPORTANT: Rotate the declination axis balance knob fully clockwise to separate the

worm from the gear. This also move the declination motor so you can access the four

socket head cap screws that are located near the lower portion of the cover. When

removing the socket head cap screws, while rotating the T-handle hex slowly be sure and

apply downward pressure at the same time so the wrench does not slip.

When the cover has been completely removed, rotate the declination axis in either

direction until a hard stop is encountered. By doing so, the mount’s internal homing

sensor index (that is part of the gear) is completely out of the way of the homing sensor.

The next step is to remove the two 7/64 inch socket head cap screws that mount the speed

reducer to the worm block assembly as shown in Figure 5.

Step 2: Remove the

four socket head cap

screws using a 3/32

inch T-handle hex

wrench.

Step 3: Remove the 3

x 3/32 inch socket

head cap screws using

a T-handle hex

wrench.

Step 1: Rotate the declination axis balance knob fully clockwise to

separate the worm from the gear.

Revision 2.0

Figure 5: Removing the two screws that mount the speed reducer and declination axis motor to the

worm block assembly.

Note the lower socket head cap screw has a washer, the upper screw does not. Please

make sure to replace the screws in the correct holes during reassembly.

The lower screw fits into a slotted hole that allows the gear reducer to be rotated around a

pivot point created by the upper screw. Rotating the assembly counterclockwise (as

viewed in Figure 5) allows belt on the reducer’s pulley to be easily removed. During

reassembly, be sure to rotate the speed reducer fully clockwise (as viewed in Figure 5)

about this pivot point to restore the original tension in the larger belt.

The declination axis motor and speed reducer can be placed on the top of the mount.

Securing the assembly with masking tape is a good idea.

Remove these two 7/64-

inch socket head cap

screws hex wrench.

Revision 2.0

Removing the Declination Sensor

Figure 6: Location of the declination axis homing sensor, looking toward the top of the declination

axis from the bottom.

The homing sensor

housing holds the optical

sensor in place.

This is the homing

sensor itself. Wires

are attached to the

sensor.

Revision 2.0

Use a standard hex wrench to remove the two socket head cap screws that are located

near the flat surface of the declination housing (Figure 7).

Remove the four socket head cap screws that hold the sensor

housing in place.

Optical sensor

Revision 2.0

Figure 7: Hex wrench used to remove socket head cap screws near the declination axis housing.

IMPORTANT: Maintaining the orientation of the homing sensor is critical. If the

assembly is installed incorrectly (by rotating 90 degrees in either direction), when the

declination axis rotates, the mechanical index on the gear will run into the side of the

optical sensor and damage it.

Use a piece of tape, or permanent marker to scribe the correct orientation of the housing

with in the axis. Here is a close up view of the sensor in the sensor housing.

Note the orientation of the

sensor before removing

the mounting screws!

Revision 2.0

Figure 8: Define the orientation of the sensor housing by marking both the assembly and declination

axis.

Once all four homing sensor mounting screws are removed, the next step is to remove the

homing sensor assembly from the mount. The assembly fits very snugly and can be

difficult to remove.

Do not pull in the homing sensor wiring to remove the homing sensor housing!

Insert the end of the needle nose pliers and orient them parallel with the long axis of the

oval hole in the homing sensor housing. Use outward pressure on the needle nose pliers

to capture the homing sensor housing (Figure 9) and extract it.

Mark the orientation of

the sensor housing in the

declination axis.

Revision 2.0

Figure 9: Use outward pressure on the needle nose pliers to carefully remove the sensor housing.

Figure 10: Close-up view of the optical homing sensor in the housing assembly.

Figure 10 show the two 5/64 inch button head cap screws that attach the optical sensor to

the homing sensor housing. If you are replacing the homing sensors, remove both screws

then rotate the optical sensor 90 degrees to remove it from the housing.

Cleaning the Optical Sensor

The red arrow in Figure 10 marks the location of the optical path that must be clear of

grease and other foreign matter for the sensor to function normally.

Before removing the homing sensor housing or the speed reducer, try using a can of

compressed air to clear the optical path. Insert the compressed air’s optional small plastic

nozzle into the oval hole in the homing sensor housing and depress the release valve in

short bursts, then test to see if homing is successful.

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