Projects/Payphone
 | |
|---|---|
| Project Payphone | |
| Name | Payphone |
| Start | 2022/02/12 |
| End | |
| Contact | User:Hillebrand |
| Website | |
| Information | Repair, restore and document a old 1980's payphone to be used to be used as a novelty wall-mounted phone |
| Status | Alpha |
I acquired a old nl:PTT Telecom payphone, type Kimus/Kimas (the name differs, most sources I found called it 'Kimus', but it is stamped as 'Kimas' into the identification plate. I will call it Kimus from now) 2.
It was manufactured somewhere in the mid/late 80's, according to chip dates.
General overview
- Comparable to the German Club Telefon 1. Some parts are interchangable.
- Dialing using both DTMF and pulse dialing, respectively TDK and IDK in Dutch telephony jargon.
- 2 coin inputs on the front, for 0.25 NLG coins ('kwartjes') and 1 NLG coins.
- Amplifier, can be operated using a button on the front
- Separate power supply, 45-60VAC (optional)
Features
Settings
The Kimus 2 can be set up by a technician using a few plastic 'programming blocks'. Their meaning is noted on a sticker on the inside of the device.
[File:Instelmogelijkheden Kimus2.jpg]
(008 was the former information service)
Translated:
- P1 x 10 = Impulse price (tens of cents)
- P2 x 1 = Impulse price (single cents)
- P3 x 25 = Minimum coin insertion
- P4 x 25 = Internal timekeeping (seconds)
- P5 x 25 = Surcharge per call
| P6 | Free numbers | Free numbers |
008 | 008 | TDK | IDK |
|---|---|---|---|---|---|---|
| No money | Money | Payment | No payment | |||
| 0 | X | X | X | |||
| 1 | X | X | X | |||
| 2 | X | X | X | |||
| 3 | X | X | X | |||
| 4 | X | X | X | |||
| 5 | X | X | X | |||
| 6 | X | X | X | |||
| 7 | X | X | X |
I do not know what 'Internal timekeeping' does. I speculate that 'Free numbers' with/without money means that calling free phone numbers requires money to be inserted. Probably to deter prank calls.
Test features
There is a button on the main PCB. Pressing this button will cycle through some test features, described below.
| P6 | Free numbers | Free numbers |
008 | 008 | TDK | IDK |
|---|---|---|---|---|---|---|
| No money | Money | Payment | No payment | |||
| 0 | X | X | X | |||
| 1 | X | X | X | |||
| 2 | X | X | X | |||
| 3 | X | X | X | |||
| 4 | X | X | X | |||
| 5 | X | X | X | |||
| 6 | X | X | X | |||
| 7 | X | X | X |
Wiring
For the bell to operate, the second connector from the top MUST be connected to the connector below (where the jumper is in the photo).
The 48-60VAC is optional. I speculate that it was used for phone booths with a large distance to the exchange, resulting in a low line current, which might cause the electronics to work improperly. My SPA112 ATA seems to supply sufficient current to ring the bell.
The E wire is earth. Needed if you want to simulate cost pulses.
Repairs
Done
Keypad trace repair
[File:Keypad PCB met nieuw soldeer Kimus2.jpg]
There was some stubborn green stuff (probably mold due to water ingress) on the bottom of the keypad PCB. Removing it required a coarse brush, and accidentally severed some traces. They were repaired using some solder.
To-do
Lock replacement
Bij een ijzerhandelaar informeren of ze een SCR0031 (2 maal) van Anker Slot hebben. https://nl.farnell.com/multicomp/s286b-1/keyswitch-spdt-2pos-rdm-1keypull/dp/1735374?ost=1735374 als vervanging voor het 'gratis bellen' slotschakelaar
Help needed
More info on the technical workings of the Kimus 2 (manuals etc) are very welcome. Romdumps and high quality pictures of the Clubtelefon 1 are also very welcome.
If you are more familiar with reverse-engineering bytecode from ancient MCU's, please get in touch.
I can be contacted at flimpie аｔ bitlair ԁоt nl.
Pictures needed
(just for my own reference, no need to send pics of your own device)
- Programming plugs on the inside of the door
