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Chapter 3 – Hardware

Chapter 3 – Hardware

Follow the wiring diagrams at the end of this manual for connections which are best made in the order found in the following sequences of wiring diagrams

 

Preparation:

 

Carefully remove 0.5cm of insulation from all the transformer wires. Do not pull on the wire where it comes out from the body of the transformer at any time as it may cause an internal break.

 

Notice that all transformer are labelled with a number, symbol or letter. These are your references for making connections.

 

Read through the entire manual as some connections have more than one wire atached. This can quickly be determined by comparing the wiring diagrams.
Remove the selector and attenuator switches by loosening the nut on the front of each.

 

Adjust the 23 position selector switch as follows (if not already done, there should be 23 positions but it may come from the factory set for 21 positions):

 

 

Remove the switches at the back the same way.

 

Make the connections as shown on the following wiring diagrams, installing piping as shown. Solder. Don’t overheat RCA jacks. This can be avoided by inserting an RCA plug into the jack being soldered. Ground connections to RCA can be made by using the thicker part of your soldering iron at the notch. These tabless ground connections are a little more difficult to make but are far superior to the separate ground tab types.

 

Wiring of front panel switches:

 

It is important to note that the selector switch has 2 pairs of wafers. The inside (transformer side) wafer is for the left channel and has 24 tabs, next wafer has 2 tabs.

 

Then there is a metal plate and two more wafers for the right channel. The diagram shows the connections for these tabs, first, right channel then left channel as if the wafers have been separated.

 

Proceed to make and solder these connections. It is easier to make the connections with the switch removed from the chassis but allow enough length of connecting wires to reinstall.

 

When finished, reinstall the cover with 4 screws. Attach the knobs to the shaft.

 

It takes about 2 weeks to run in the Django before the sound reaches full potential.

 

Troubleshooting:

 

A TVC is a simple device so trouble shooting usually involves finding the cold solder joint or misconnected wire. A good way to start is connect an ohmmeter across the RCA output and the adjacent ground tab. Operate the attenuator. Resistance should increase in even steps and never decrease as the attenuator is turned from lowest to highest position. Otherwise. A wire is misconnected. Check selector operation by connecting to each one of the RCA inputs and its ground. Choose that position on the selector. There should be continuity. Resistance depends on the setting of the gain switch.

 

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