Astro-Physics maintains an inventory of electronic parts for current and previous models. If you need a replacement or a spare, we can either ship it from stock or assemble it for you. This list is not complete, particularly regarding the older models. If you do not see what you need, give us a call.

Please read all information carefully since most of these items were designed for a specific electronic drive system and are not interchangeable with other drive systems.

A page describing the various methods for controlling Astro-Physics mounts may be found at this link: Control Your GTO Mounts with Your Keypad, Computer, or Mobile Smart Device.

The GTOCP4 Control Box, is now available as an upgrade for all GTO mounts that we have produced since 1998. It is also included with all new mount orders. Check out the GTOCP4 if you are interested in USB, WiFi or Ethernet connectivity. It will also allow future firmware upgrades via internet download and more.

Information regarding the GTOCP3 in this document is provide for reference.

Complete GTOCP3 detailed information

Mounts that can use the GTOCP3 control box: All GTO mounts - All Mach1GTO, 900GTO, 1100GTO, 1200GTO, 1600GTO, 3600GTO and prior models 400GTO and 600EGTO. The parameters of the GTO control box depend on the gear ratio and motor of the mount. Therefore, the control boxes are not necessarily interchangeable from one model to another. For instance, the control box for the 400 mount cannot be used with the 1200 mount. However, the control box for the Mach1GTO, 900GTO, 1100GTO, 1200GTO and 1600GTO mounts are interchangeable. Please check with Astro-Physics before substituting control boxes. Additional information is provided at this link.

Please note the following additional considerations if you are upgrading from a GTOCP1 control box:

• 400GTO and 600EGTO - If you are upgrading from the GTOCP1 control box, you will also need to purchase a new carrying pouch, our part #C0024 or our Control Box Adapter (CBAPT).
• 900GTO - If you are upgrading from the GTOCP1 control box, you will need a the Quick Release Adapter for Control Box Kit (9CBKIT) to attach it to the RA axis. This dovetail-style adapter has the added advantage of allowing you to easily remove the control box from the mount, if you wish.You will also need a new RA/Dec Y-Cable (S900GYCR) to replace the two separate RA and Dec cables that you now have.
• 1200GTO - If you are upgrading from the GTOCP1 control box, you will need the 1200GTO Quick Release Adapter for Control Box Kit (12CBKIT) to attach it to the RA axis. This dovetail-style adapter has the added advantage of allowing you to easily remove the control box from the mount, if you wish. You will also need a new RA/Dec Y-Cable (S1200GYCR) to replace the two separate RA and Dec cables that you now have.

GTO Manual

Astro-Physics GTO Servo Motor Drive System - Model GTOCP3 - Manual

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We also recommend that you have an extra Y-cable on hand as a backup in case your original cable is damaged.

Mounts that can use these cables: 900GTO (S900GYCR) and 1200GTO (S1200GYCR) with either the GTOCP2, GTOCP3 or GTOCP4 Control Boxes (The model number is silk screened on the front panel of the control box). Cable available on request.

Our cables utilize a high-tech rubber sheathing that remains flexible in the coldest of conditions. Please note that our Y-cables are mount specific and cannot be interchanged due to dimensional differences.

This 12" replacement cable is available if you damage or lose yours.

Mounts that can use this cable: 900GTO and 1200GTO with a GTOCP1 Control Box and 900SMD and 1200SMD with SMDCP1 Control Box. The control box model numbers are silk screened on the front panel of the control box). Cable available on request.

This 37" replacement cable is available if you damage or lose yours.

Mounts that can use this cable: 900GTO and 1200GTO with a GTOCP1 Control Box and 900SMD and 1200SMD with SMDCP1 Control Box. The control box model numbers are silk screened on the front panel of the control box. Cable available on request.

Mounts that can use this cable: All mounts that have the receptacle for the locking power connector shown above. This includes all mounts with these control systems: DA, QMD, SMD and GTOCP1, GTOCP2 and GTOCP3 (except the first black 1200 mounts), It can also be used for the cooling fans on the 10" Maksutov-Cassegrain and the 305 mm Riccardi-Honders Astrograph.

If your early model mount requires a replacement cable or controller that is not mentioned here, please give us a call. We can also provide the custom cables listed below; price determined by length:

• Extension Cable for Quartz Microdrive Controller: We have produced extension cables up to 40'.