• You install the chip into the GTO control box and download the keypad upgrade from our website. It is quite easy to remove the old chip and install the new one, however you must be very careful or the chip carrier could be damaged. Please read the accompanying installation instructions for your control box. If you crack the chip carrier, it will have to be sent to us for repair. Since there are many solder connections and the repair is time consuming, the repair charge will be $130.00. If you are not sure that you can remove your current chip safely, please choose one of the options below.

• You send your GTO control box to us and we will install the chip. We return to you and you complete the keypad upgrade from our website.

• You send both the GTO control box and keypad to us and we do the complete upgrade.

Please call or e-mail Astro-Physics for further information and pricing. If you did not purchase the mount directly from us, please look for the serial number on your mount before you call.

400GTO and 600EGTO - The serial number is located on the underside of the base of the mount. Remove from your pier or tripod to see the number.

900GTO and 1200GTO - The serial number is located within one of the dovetail cutout areas visible when the RA and Dec axis are taken apart. If you have one of the earlier 1200GTO mounts that do not have the dovetail, look on the underside of the mount.