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Cathode Corner SCTV, Assembly And User'S Manual

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SCTV Clock Assembly Manual 

1/24/22 

8 

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 

Seven laser-cut plastic pieces (coated in paper) 
3RP1-A CRT 
12V wall power adapter 

 

 

If anything is missing, please contact Cathode Corner for assistance.  
The PCB is provided with all the surface-mount parts already soldered to it. These parts are rather 
difficult to solder without a lot of experience. The easy work is left for you to do.  

Summary of Contents for 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 2...

Page 3: ...3 Table of Contents Introduction 5 Theory of Operation 6 PC Board Assembly 8 Cabinet Assembly 14 Initial Checkout 27 Final Assembly 27 Using Your Clock 31 Optional GPS receiver 32 Care of the Cabinet...

Page 4: ...SCTV Clock Assembly Manual 1 24 22 4...

Page 5: ...scope 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 The clock is sup...

Page 6: ...provide regulated voltage outputs Moving on to the regulator the deflection voltage is the one actually regulated The other voltages follow this voltage in proportion to their turns ratios The regulat...

Page 7: ...a CRT A sine wave on the Y plates and a cosine wave on the X plates give a circle If the phase difference is zero then the circle collapses to a slanted line If Y 0 the line is horizontal etc Each cha...

Page 8: ...ole PC board components Ziploc bag with CRT and pot wiring parts Ziploc bag with hardware Seven laser cut plastic pieces coated in paper 3RP1 A CRT 12V wall power adapter If anything is missing please...

Page 9: ...d 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 smalle...

Page 10: ...1 USB jack J9 5 1 504 Trim pot 500K R1 6 2 103 Trim pot 10K R2 R3 7 2 black Socket strip 24 pin for U2 8 1 black Socket strip 5 pin for U2 9 1 DC power jack J1 10 1 Header 6 pin 10 J5 11 1 Header 7 pi...

Page 11: ...er pin of each pot then reheat this pin while pressing the pot against the board to ensure that it fits tightly against the board Check also for square alignment to the board to keep a neat appearance...

Page 12: ...nds to sit higher than the others due to the wires underneath it Solder one pin on each side then adjust it then solder the remaining pins Trim the excess lead length 20 21 Mount the heat sink for U1...

Page 13: ...USB end of the Teensy with the edge of the board Solder the two 24 pin strips and the five pin strip to the Teensy holes Use care as there isn t much room to work on the Teensy and it has many small...

Page 14: ...ded rigidity The base holds the PC board the front and rear faces and the cover A bag of cabinet hardware is used to assemble the cabinet The PC board is first mounted to the base assembly then the fr...

Page 15: ...g skyward Place a cat PC board over the pot with the white square down so that the square is facing the pot Solder the three pins then trim the leads flush Repeat for the other two pots Each pot has a...

Page 16: ...er being careful to remove any blobs Mount the remaining kitty board with 105L pot in the vise Insert the orange wire into the hole marked 1 with the insulation on the pot side of the board Solder it...

Page 17: ...SCTV Clock Assembly Manual 1 24 22 17 Insert the little terminals into this block as shown in the chart below Pin Wire 1 Brown 2 Red 3 Orange 4 Yellow 5 Green 6 Blue...

Page 18: ...e 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...

Page 19: ...he left of the notch in this orientation and pin 12 is to the right of the notch Solder the wires to the CRT pins per the table below Bend each wire s bare end into a V shape and hook it through the s...

Page 20: ...r the two wires in each of the following three pairs of CRT wires Twist them by holding both wires out at a 20 degree angle from each other then passing one over the other repeatedly until they re in...

Page 21: ...ieces are shipped with a protective paper coating on each side This coating needs to be removed from the pieces just before assembly It s not too hard to remove the paper from the solid acrylic pieces...

Page 22: ...x1 2 screws into the two screw holes at the base Pot Installation See the photo on the next page to see how the pots are installed into the front panel Plug the 6 pin Molex plug with the two position...

Page 23: ...otated correctly to display the time right side up with pin 1 down Pass the CRT socket wires through the hole in the rear face of the case Plug the 6 pin Molex plug into J2 on the PC board Plug the 5...

Page 24: ...parallel to each other Bend each of the two screw tabs and the other two tabs so they are perpendicular to the metal so that they all lie flat on a table Install the 6 32x3 4 screw and nut into the c...

Page 25: ...lt strip Take care to only peel the white paper and not the clear adhesive from the felt This may require tweezers Stick the end of the felt to edge of the CRT just behind the face in a direction that...

Page 26: ...ess on the socket pins as these are fragile and may break off Press on the white ceramic only You may not be able to seat it fully but try to make the gap between CRT base and socket be less than 1 8...

Page 27: ...can be checked with a plastic ruler against the two tabs at either side of the center of the front face Be sure that the felt is protruding 1 16 at the bottom and tighten the neck clamp on the CRT sn...

Page 28: ...on the tape along the edge of the plastic piece to make it stick well Be sure to stick it to every slot so they will all be pulled up Start peeling up the tape at one corner of the paper It should li...

Page 29: ...he small bits of paper from the text areas Find the top of the cup piece by feeling the edges for the smoother edge Press a square nut into each of the five slots on the cup from the top side Center e...

Page 30: ...of the cover so that the two tabs fit into the slots Orient the cover so that one end is facing you Place the clock upside down onto the cover so that the two tabs on the top of the clock engage the...

Page 31: ...force to press You will see a menu with three lines the top line highlighted Rotate the big knob to highlight Set Time and Date then press the knob again You will see the time and date displayed with...

Page 32: ...e GPS time when the GPS receiver is unplugged It may lose a second since that s how often the GPS time messages are sent Care of the Cabinet The cabinet is made of acrylic plastic This plastic can be...

Page 33: ...SCTV Clock Assembly Manual 1 24 22 33...

Page 34: ...SCTV Clock Assembly Manual 1 24 22 34...

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