1. Manuals
  2. Brands
  3. Cathode Corner Manuals
  4. Watch
  5. SCTV
  6. Assembly and user's manual

Cathode Corner SCTV Assembly And User's Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
SCTV Scope Clock Kit
Assembly and User Manual
Copyright (C) 2022 Cathode Corner. All rights reserved.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SCTV and is the answer not in the manual?

Questions and answers

Related Manuals for Cathode Corner SCTV

Summary of Contents for Cathode Corner SCTV

  • Page 1 SCTV Scope Clock Kit Assembly and User Manual Copyright (C) 2022 Cathode Corner. All rights reserved.
  • Page 2 SCTV Clock Assembly Manual 1/24/22...

  • Page 3: Table Of Contents

    Cabinet Assembly ............................. 14 Initial Checkout ............................27 Final Assembly ............................27 Using Your Clock ............................. 31 Optional GPS receiver ..........................32 Care of the Cabinet ........................... 32 Warranty ..............................32 Schematic Diagram ........................... 32 SCTV Clock Assembly Manual 1/24/22...
  • Page 4 SCTV Clock Assembly Manual 1/24/22...

  • Page 5: Introduction

    The Clock The SCTV scope clock is an electronic clock that displays the time and more on a small oscilloscope tube using artfully drawn numbers. While most digital clocks use a seven-segment display optimized for low cost and ease of manufacture, the SCTV is optimized for aesthetic appeal.

  • Page 6: Theory Of Operation

    Blanking is active whenever the beam is being moved from one location to another. The computer tells the blanking circuit when to blank the beam. Blanking is accomplished by switching the grid to a much more negative voltage by the Z modulation circuit to cut off the beam. SCTV Clock Assembly Manual 1/24/22...
  • Page 7 The firmware automatically connects to the GPS receiver as long as it emits an NMEA data stream at 4800 baud. The internal clock chip is reset to match GPS time every second, so that the time will still be correct if GPS reception is lost. SCTV Clock Assembly Manual 1/24/22...

  • Page 8: Pc Board Assembly

    PC Board Assembly Getting Started Make sure that you have the following major parts: SCTV printed circuit board (PCB) with surface-mount parts already installed Anti-static bag with thru-hole PC board components Ziploc bag with CRT and pot wiring parts Ziploc bag with hardware...
  • Page 9 A photograph of the top side of the assembled board is shown below. Refer to this photo to see how the parts fit. Tools needed Soldering iron, fine tip, adjustable temperature preferred Solder, high quality lead-free or leaded .031" diameter or smaller, rosin or no-clean flux Small diagonal cutters Small long-nose pliers #1 Phillips screwdriver SCTV Clock Assembly Manual 1/24/22...
  • Page 10 U1 Hex nut, 4-40 for U1 7805 Regulator IC with cap. black Wire, 1.5” long for U7 black 24 pin strip for U2 black 5 pin strip for U2 Teensy 3.6 Computer CR2032 Battery SCTV Clock Assembly Manual 1/24/22...
  • Page 11 Solder one pin on each then check that they are fully seated. Solder the remaining pins. 15) Install and solder the 1uF electrolytic capacitors C29 and C30 next. Observe polarity! Note that the Japanese manufacturers mark the negative lead of the electrolytic capacitors, but the PC board marks the SCTV Clock Assembly Manual 1/24/22...
  • Page 12 7805 regulator IC under this screw, with the legs over the F1 pads. Bend the leg without the capacitor down so that it contacts the top of the F1 lead. Solder this pin to the F1 lead. SCTV Clock Assembly Manual 1/24/22...
  • Page 13 (Apologies for making you do this work, the Teensys with pins were all sold out.) 31) Remove the CR2032 battery from its package by trimming away the paper area with scissors, then insert it + side up into the B1 battery holder. PC board assembly is complete. SCTV Clock Assembly Manual 1/24/22...

  • Page 14: Cabinet Assembly

    Separate the wires carefully by length, as there are six different groups of wires that are soldered to different things. The pot wires have small gold Molex pins, while the CRT socket wires have large tin Molex pins. SCTV Clock Assembly Manual 1/24/22...
  • Page 15 Tin the bare ends of the wires with solder, being careful to remove any blobs. Mount the other kitty board with 103L pot in the vise. Insert the brown wire into the hole marked 1, with the insulation on the pot side of the board. Solder it from below/front. SCTV Clock Assembly Manual 1/24/22...
  • Page 16 Don’t force it if it won’t slide in; pull it out and try again at a different angle. The pin will snap into place when properly guided in and seated. SCTV Clock Assembly Manual 1/24/22...
  • Page 17 Insert the little terminals into this block as shown in the chart below. Wire Brown Orange Yellow Green Blue SCTV Clock Assembly Manual 1/24/22...
  • Page 18 Find the small 7 pin header block. Orient it so that the large holes are facing you, and the small slots are at the top. This places pin 1 at the left end. Insert the little terminals into this block as shown in the chart below. Wire Brown Orange Green Blue Violet SCTV Clock Assembly Manual 1/24/22...
  • Page 19 Rotate the socket in the vise 180 degrees before soldering pins 6-10, so that the pin being soldered is always near the bottom. Color CRT Pin Orange Brown Yellow Green Grey Violet Blue Black White SCTV Clock Assembly Manual 1/24/22...
  • Page 20 In this orientation, pin 1 is on the left end. Shell Color 6 pin Brown 6 pin 6 pin Orange 6 pin Yellow 6 pin 6 pin Green 5 pin Blue 5 pin Violet 5 pin Grey 5 pin White 5 pin Black SCTV Clock Assembly Manual 1/24/22...
  • Page 21 It's best to do this work in a particular order to retain cleanliness between the two base pieces. Peel the paper off the top of one piece, set it aside, then peel the paper off the bottom of the other piece. Press the clear sides of the two pieces together. SCTV Clock Assembly Manual 1/24/22...
  • Page 22 After all screws are installed, tighten them snug with a #1 Phillips screwdriver and a 3/16” nutdriver or end wrench. Place the SCTV PC board on the standoffs. Install a 4-40x3/16” screw in each of the six holes in the PC board. Tighten these screws snug.
  • Page 23 Plug the 6-pin Molex plug into J2 on the PC board. Plug the 5-pin Molex plug into J4 on the PC board. The wires will reside in the notch on the side of the hole after the clamp ring is installed in the next step. SCTV Clock Assembly Manual 1/24/22...
  • Page 24 Install a 6-32 hex nut on the screw inside the rear face. Repeat for the other clamp screw. See the photo below. Tighten these screws firmly while holding the clamp ring centered in the opening. SCTV Clock Assembly Manual 1/24/22...
  • Page 25 CRT. If it starts going on crooked, peel it up and straighten it out as you go. When you have completed the circle, cut the felt strip to length so that the ends nearly meet but do not overlap. SCTV Clock Assembly Manual 1/24/22...
  • Page 26 Check that the big knob can be pushed in to hear a click, and that it springs back. If not, readjust its depth on the shaft to allow it to move in and out freely. SCTV Clock Assembly Manual 1/24/22...

  • Page 27: Initial Checkout

    Plug the wall adapter into the wall, then plug it into the DC power jack J1. The filament should glow orange after a few seconds, and a Cathode Corner splash screen should appear on the CRT screen after about 20 seconds. The display is likely to be very narrow.
  • Page 28 Start peeling up the tape at one corner of the paper. It should lift the paper off the plastic. If not, give it some help with your fingernail. Slowly lift the tape, being sure that it’s taking the paper with it. Peel the rest of the paper off the piece, section by section. SCTV Clock Assembly Manual 1/24/22...
  • Page 29 Fold the cup around the cap, with the writing on the cap facing out. Hold the cup in this position, you will find that it takes several fingers to do this. Wrap a piece of painter’s tape around the two ends of the cup so that the tape holds the cup around the cap. SCTV Clock Assembly Manual 1/24/22...
  • Page 30 Without lifting the clock, rotate the cloth on the bench so that the other side of the clock faces you. Repeat the procedure to install the other side of the cover. Install the screws after the cover snaps into place. Congratulations, you have built a Scope Clock! SCTV Clock Assembly Manual 1/24/22...

  • Page 31: Using Your Clock

    DST on/off selects whether the GPS time is adjusted ahead by an hour. This is not automatic, since the code required to handle all cases is beyond the abilities of the creator of the clock. Feel free to write your own code. SCTV Clock Assembly Manual 1/24/22...

  • Page 32: Optional Gps Receiver

    Novus plastic polish may be used to keep the plastic shiny. Warranty Cathode Corner warrants the SCTV Scope Clock to be free of manufacturing defects for a period of one year. If your clock fails to give satisfaction in that time period, contact Cathode Corner for shipping authorization and instructions.
  • Page 33 SCTV Clock Assembly Manual 1/24/22...
  • Page 34 SCTV Clock Assembly Manual 1/24/22...

Table of Contents