Partyline: Does the Hitachi TU-Z3A / CX-Z3A camera CCU support both 4-wire and 2-wire applications?

Question:  We are considering purchasing several TU-Z3A / Z4500W Hitachi camera systems for use with our Clear-Com party-line system at the studio.  Can we connect the TU-Z3A CCU directly to our PL system or should we use a 4-wire to 2-wire interface to patch in the camera CCUs?  Do you know the pin outs for the camera CCU, does it support both 2-wire and 4-wire connections?
Answers:  The Hitachi TU-Z3A camera control unit supports both unbalanced 2-wire party-line use and 4-wire balanced intercom use for Matrix systems and IF4W4 interface use for connection to party-line systems (Clear-Com and RTS).  Use the 2-wire settings on the camera CCU to connect a single camera directly to the Clear-Com PL line, but if you are going to connect multiple cameras to the PL line it is recommended that the use of a 4-wire to 2-wire interface adapter be employed as this will allow the PL intercom line to be properly loaded (multiple CCUs in 2-wire mode connected directly to the PL line will load down the impedance and cause the audio on the line to be lowered significantly). 
See the diagrams below for pin outs of the CCU db-15 connector and the switch settings for the internal CCU intercom card that allow for 4-wire use and 2-wire Clear-Com or RTS use. 

Attached below is the Hitachi TU-Z3A / CX-Z3A camera control unit manual.
  File Modified

PDF File TUZ3ACXZ3A service manual.pdf TUZ3ACXZ3A service manual.pdf

Apr 06, 2019 by Administrator


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