PRESS BUTTON UNIT No. 53
This a press button unit that consists of a 10 button keypad marked 1 to 0.

The keypad is LD (Loop Disconnect) only.

Used on Telephone No's 755, 756 & 758.

Model Mark Ivory PBU No. Introduced Remarks
Telephone 755 Mk 1y 53A/14/79 STC
  Mk 2y 53B/11/80 STC S/S Mk 1
  Mk 3y 53A/21/80 GEC
  Mk 4y 53A/37/80 PYE-TMC
  Mk 5y 53C/17/80 STC
  Mk 6y 53B/27/80 GEC
  Mk 7y 53B/37/80 PYE/TMC

 

PBU No. 53B/3 (GNA)

 

 
 
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Last revised: September 27, 2024

FM