Question about Meade ETX-125EC (500 x 127mm) Telescope

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Motor tries but cannot move on the horizontal. Moves fine on the vertical. Usage only in Alt/Az mode. Only have the electronic controller that came with the scope.

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You did tighten the AZ clutch? You did start from the HOME position? (turn the scope Counterclockwise to the hard stop)

Then you will either have to send it back to Meade for repairs, or open the bottom of the base, and look inside and see if the AZ worm gear is actually meshing with the motor. It could have come loose.

Meade customer service:
http://www.meade.com/support/index.html

Posted on Oct 09, 2010

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Mode Actuator
The mode actuator is an electronic stepper motor with feedback potentiometers. The HVAC control module sends signals to the mode door actuator through the mode door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the mode actuator. When you select a desired mode setting, logic determines the value of the mode actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the mode door position signal circuit. The motor moves the mode door to the desired position.

Defrost Actuator
The defrost actuator operates the same as the mode actuator. The HVAC control module sends signals to the mode door actuator through the defrost door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the defrost actuator. When you select a defrost setting, logic determines the value of the defrost actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the defrost door position signal circuit. The motor moves the defrost door to the desired position.

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Meade DS-2114S, can not get the vertical, up/down movement to work when using the autostar mode, can hear the motor drive working but no movement, the left / right moves fine, and the up / down moves fine...


The knob on the fork arm is tightened? Correct. You can slew manually, but cannot do a two star alignment?

Is all of this correct? Post a reply with additional information.

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Unable to adjust the settings for brightness and contrast .


To adjust the display settings:

1. Press the flywheel control. The main menu appears.

The current display settings appear across the top of the main menu.

2. Rotate the flywheel to highlight an option. The name of the
highlighted option appears in the center of the menu.

3. Press the flywheel control to select the highlighted option, then
rotate the flywheel to adjust it.

Some options can only be enabled or disabled. There are also some
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4. Repeat Steps 2 and 3 until you have made all your changes.

5. Rotate the flywheel control until Exit is highlighted, then press
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OSD OPTIONS:

Contrast increases or decreases display image contrast.

Brightness increases or decreases display image brightness.

Horizontal Size increases or decreases the width of the display image.

Horizontal Position moves display image to the left or right side of
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Vertical Size increases or decreases the height of the display image.

Vertical Position moves display image to the top or bottom of the
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Pincushion curves the sides of the display image inward or outward.

Trapezoid increases or decreases the trapezoid distortion of the
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Degauss removes magnetic discoloration from the display image.

Recall returns most options to the original factory default settings
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modes” section in this guide for information about the factory preset
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Advanced Option opens the Advanced Option menu. Color opens the Color
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Language changes the display language for the OSD control system.

User displays information about the monitor’s preset modes.

OSD Manager moves the OSD control window on the screen.

Exit closes OSD control system.

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1 Answer

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2 Answers

Motor operates in horizontal position only


Take the top cover off and check for a wiring problem. You may have one that is loose and isn't
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1 Answer

Pt-47wx49e service mode


It sounds like the convergence amplifier IC for the red crt is at fault. To check this, go into your user menu and pull up the red convergence. Try to move it up/down or side to side(it doesnt matter). If it moves up and down, then the vertical amp is working. Likewise if it moves side to side, then the horizontal part of the IC is working. If it dosen't move at all, or only moves up/down or side to side, then the IC is bad. There are 2 large IC's on the chassis, mounted to large heatsinks. They have STK392-110 or some variation of an STK392. If yow feel that the IC is bad, change the ic BEFORE you go into the service mode, as you wont need it if the ic is bad. To get into theservice mode: 1 make sure tv is in cable mode 2 set sleep timer to 30 minutes 3 tune to channel 124 4 use volume down on front of set to turn volume all the way down. ( writing will appear in the top left corner). 5 use remote control and press the power button. 6 the 7 button on the remote will put it convergence mode. Good Luck!

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1 Answer

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Probably the red convergence output IC has failed. The chip is basically a stereo amplifier that serves as a horizontal amplifier and a vertical amplifier. I suspect the vertical part has failed and is not uncommon. Should be generic STK392-150's or maybe STK392-110/120 I believe. By the way when the line moves up and down that means the vertical is working when it moves side to side the horizontal is working.

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