Applied Digital Data Systems, Inc. or 'ADDS' Regent 25 Data Terminal - 1979

May 10, 2024 Michael Thwaite

Data Terminals Photo Album

Links

https://terminals-wiki.org/wiki/index.php/ADDS_Regent_25 Terminals Wiki.

https://texelec.com/product/foam-capacitive-pads-keytronic/?highlight=foil New "Foam and Foil" Capacitive Pads for KeyTronic & BTC Keyboard Repair.

http://telcontar.net/KBK/Cherry/solid_state A rich & extensive repository of keyboard history and information.

Attached here are some photos taken during the restoration of the ADDS Regent 25 Data Terminal that might help catalogue some experiences for future reference.

Strip Down

I began by photographing the components in readiness for strip down and painting.

ADDS Regent 25 Initial start up — Initial start up

ADDS Regent 25 AC inlet US Hot (black) Neural (white) & earth (grean) — AC inlet US Hot (black) Neural (white) & earth (grean)

ADDS Regent 25 case components 1 — Case components

ADDS Regent 25 Cherry Capacitive Keyboard in situ — Cherry Capacitive Keyboard in situ

ADDS Regent 25 CRT board top view from right — CRT board top view from right

ADDS Regent 25 CRT board TR44 — CRT board TR44

ADDS Regent 25 CRT board video & power — CRT board video & power

ADDS Regent 25 CRT coils — CRT coils

ADDS Regent 25 CRT frame earth point from top right — CRT frame earth point from top right

ADDS Regent 25 CRT front — CRT front

ADDS Regent 25 CRT right showing transformer exposed — CRT right showing transformer exposed

ADDS Regent 25 Front view of PCB — Front view of PCB

ADDS Regent 25 keyboard and front panel components removed — Keyboard and front panel components removed

ADDS Regent 25 Keyboard Cable in Error — Keyboard Cable in Error

ADDS Regent 25 keyboard removed — Keyboard removed

ADDS Regent 25 keyboard tape from possible previous repair and top vent grile - disintigrated — Keyboard tape from possible previous repair and top vent grile - disintigrated

ADDS Regent 25 Mystery loopback — Mystery loopback

ADDS Regent 25 PCB power connection — PCB power connection

ADDS Regent 25 PCB rear video cable connection — PCB rear video cable connection

ADDS Regent 25 PCB slid out for service — PCB slid out for service

ADDS Regent 25 PCB top view focus on display and character ROM — PCB top view focus on display and character ROM

ADDS Regent 25 PCB top view — 25 PCB top view

ADDS Regent 25 Power supply lower right — Power supply lower right

ADDS Regent 25 Power Supply — Power Supply

ADDS Regent 25 Power supply coupling — Power supply coupling

ADDS Regent 25 Power Supply — Power Supply

ADDS Regent 25 Power switch and LED connection from right — Power switch and LED connection from right

ADDS Regent 25 Power switch coupling — Power switch coupling

ADDS Regent 25 Power Switch, LED & keyboard locating pin — Power Switch, LED & keyboard locating pin

ADDS Regent 25 PSU cap 1 — PSU cap

ADDS Regent 25 PSU frame mounting — PSU frame mounting

ADDS Regent 25 top case underside showing front and keyboard panel removal — Top case underside showing front and keyboard panel removal

ADDS Regent 25 top view of CRT board — Top view of CRT board

Keyboard Rebuild

ADDS Regent 25 Cherry Capacitive Keyboard Top View — Cherry Capacitive Keyboard Top View

ADDS Regent 25 Cherry Capacitive Keyboard Close up of part number — Close up of part number

ADDS Regent 25 Cherry Capacitive Keyboard Close up of circuit board details — Close up of circuit board details

ADDS Regent 25 Cherry Capacitive Keyboard Top view of board, keycaps removed — Top view of board, keycaps removed

ADDS Regent 25 Cherry Capacitive Keyboard Circuit board removed — Circuit board removed

ADDS Regent 25 Cherry Capacitive Keyboard key plungers removed showing foam and foil capacitive pads — Key plungers removed showing foam and foil capacitive pads

ADDS Regent 25 Cherry Capacitive Keyboard Close up of AMI 7949UU Keybaord Encoder — Close up of AMI 7949UU Keybaord Encoder

Cleaning and Painting

ADDS Regent 25 base painted

ADDS Regent 25 Case components cleaning

ADDS Regent 25 Case components ready for painting — Case components ready for painting

ADDS Regent 25 Flat black and Heirloom White paint — Flat black and Heirloom White paint

ADDS Regent 25 front panel paint run — Front panel paint run

ADDS Regent 25 keyboard panel painted — Keyboard panel painted

ADDS Regent 25 stripped on bench — Stripped on bench

ADDS Regent 25 top case painted — Top case painted

Paint tin buckled

Complete

ADDS Regent 25 Refurbished