English version by Lucien-Paul Kmiotek.

SL-HF 950 Conversion for additional-AV/S-VIDEO-IN through scart socket.

Use the switch position "SIMUL" from the input selector switch to switch on the additional input. With the current version, the recorder must be receiving a television channel through the tuner! Otherwise you will encounter problems with the drum servo. I'm currently working on this problem.

Parts list:

  1. RL1: Relay with 4 switch over contacts 12V= from Conrad-Elektronik order No. 50 29 10-88 or two relays, both with 2 switch over contacts, these must work with 9 volts.
  2. D1: Diode 1N 4148
  3. ZD1: Z-Diode 10V 0,5W
  4. R1: Resistor 75 Ohm
  5. Shielded wire, flat cabel & wire

Pos. 3 & 4 is only necessary with S-Video.

This is how it's done:

The recorder must be dismantled. Take the cover off the function board. Cut the circut at place shown. The recorder on "SIMUL" will now switch to "LINE". (fig. 1)

Now remove the printed circuit of the function board and solder a wire (grey here) about 50cm long long onto the soldered side. The wire has to go to the YC-40 printed circuit. This wire controls the relay. The printed circuit and the cover can now be reassembled. (fig.2)

Now unsolder the middle pin of the video-IN-BNC-socket. Fix a shielded wire onto the middle pin of the BNC socket (RL 8) and in the vacont hole (RL 9) of the YC-40 printet circuit. The shield of both wires must be soldered to the fixture bracket of the socket. (fig. 3)

Remove the audio IN/OUT jack board. There the pin wires 5,6 and 7 must be unsoldered. You now need a 7 pole flat cabel that must be soldered as follows:

  1. Violet on plug pin 7 (right - RL 4)
  2. Blue on plug pin 6 (GND)
  3. Green on plug pin 5 (left - RL 10)
  4. Yellow on printed circuit pin 6 (GND)
  5. Orange on printed circuit pin 7 (right - RL 5)
  6. Red on printed circuit pin 6 (GND)
  7. Brown on printed circuit pin 5 (left - RL 11)

(fig. 4)

The wires to the plug must be insulated. The audio jack board can now be reassembled.

Scart socket: You need a 3 pole flat cable & shielded wire. First solder the three pole cable as follows:

  1. Red on Scart pin 2 (right - RL 6)
  2. Orange on Scart pin 4 (GND)
  3. Yellow on Scart pin 6 (left - RL 12)
  4. Solder a shielded cable onto the scart pin 20 (Video IN-RL 7) and solder the shield onto the scart pin 17 (GND)
  5. Solder the second shielded cable onto pin 15 (Colour IN - RL 1) and solder the shield onto the scart pin 13 (GND)

Pos. 5 is only necessary with S-Video.

(fig. 5)

With S-Video a bridge has to be soldered on the underside of the printed circuit from the scart pin 17 to the pin 13. Also solder the z-diode ZD1 and the resistor R1 through scart pin 13 to 15. Where the black ring of the z-diode points to pin 15. (fig. 6)

Now wire up the relays RL 1: This only works with correct polarization of the voltage supply, check this out first. Solder the diode D1 with the cathode on the plus side and the anode on the minus side. At the same time you can solder the wire from the funktion board (A) and a wire to the minus JW 73. Now cut the 3 pole flat cable from the scart socket to length and shorten the middle wire (orange) by 1 cm. Now solder as follows:

  1. Yellow (left IN) onto relay pin 12
  2. Red (right IN) onto relay pin 6

Now cut the 7 pole flat cable from the audio board to length and shorten the middle wire (yellow) by 1 cm. Now solder as follows:

  1. Solder the blue wire to the red wire (GND) and insulate
  2. Violet (right) onto relay pin 4
  3. Orange (right IN) onto relay pin 5
  4. Green (left) onto relay pin 10
  5. Brown (left IN) onto relay pin 11

Now cut the shielded wires to length and expose about 1cm. Remove shield and insulate. Solder as follows:

  1. From printed circuit Y/C-40 (video) onto relay pin 9
  2. From BNC (video IN) onto relay pin 8
  3. From scart pin 20 (video IN) onto relay pin 7

For the s-video version you must convert as follows:

  1. Remove the bridge JW 72 on the Y/C-40 printet circuit.
  2. Join the relay pin 2 to the JW72 hole next to the JW 78.
  3. Join the relay pin 3 with the ozher JW 72 hole.
  4. Solder the shilded wire from scart 15 onto the relay pin 1.

(fig. 7 & fig. 8)

Now to check. If the first attempt is successful you can stick the relay with hot glue. With S-Video the picture at the video and aerial output is black and white while recording. Only during playback and tuner and line operation is the picture at the output still in colour. This problem is difficult to solve. I am working on the S-Video output, maybe this will improve matters.

After this conversion the scart socket ist the same, and can be used with standard cables and adaptors. I have tested the s-video input with the s-video scart adaptor of my camcorder.

What are the advantages?

With the s-video input and s-video sources (camera, DVD and DVB) the picture is an improvement on standard video input. Cross-colour and cross-luminance, (colours running into one another on striped or checked surfaces) is eliminated. I dont think the s-video input improves the sharpness of the picture though, because the recorder can only reach a maximum of 3,8 MHz (PAL)

I also have a differenet version of the s-video input, that can give a sharper picture. If it works I will let you know.

For navigation please click here.

Circuit diagram: The new parts are red.

fig. 1: Function board, front.

fig. 2: Function Board, back.

fig. 3: The converted video-in BNC socket in detail.

fig. 4: The converted audio jack board.

fig. 5: The connection of the scart socket, the shielded wire on the left is only necessary for the s-video an directs the colour signal (C).

fig. 6: The bridge, 10V z-diode and the 75 Ohm resistor is only necessary for the s-video.

fig. 7: You can see the grey wire of the function board (A) in the middle. I got the minus pole from the bridge JW73. Above you can see the 7 pole cable to the audio board, and on the right the 3 pole cable to the scart socket audio in. The numbers on the relay represent the numbers on the circuit diagram.

fig. 8: The audio switch-over in detail.

fig. 9 The Y/C-40 printed circuit with relay.

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