Edit Project: Projects/Payphone

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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 === [[File:Programmeerblokjes Kimus2.jpg|thumb|The Kimus2 'programming blocks'.]] 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 {| class="wikitable" |- style="font-weight:bold;" ! P6 ! Free numbers ! Free numbers<br /> ! 008 ! 008 ! TDK ! IDK |- style="font-weight:bold;" | | No money | Money | Payment | No payment | | |- | style="font-weight:bold;" | 0 | | X | X | | | X |- | style="font-weight:bold;" | 1 | | X | X | | X | |- | style="font-weight:bold;" | 2 | | X | | X | | X |- | style="font-weight:bold;" | 3 | | X | | X | X | |- | style="font-weight:bold;" | 4 | X | | X | | | X |- | style="font-weight:bold;" | 5 | X | | X | | X | |- | style="font-weight:bold;" | 6 | X | | | X | | X |- | style="font-weight:bold;" | 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 === [[File:Hoofdprint Kimus2 met testknop gemarkeerd.jpg|thumb|The test button, marked in red.]] There is a button on the main PCB. Pressing this button will cycle through some test features, described below. [[File:Testfuncties Kimus2.jpg]] {| class="wikitable" |- style="font-weight:bold;" ! P6 ! Free numbers ! Free numbers<br /> ! 008 ! 008 ! TDK ! IDK |- style="font-weight:bold;" | | No money | Money | Payment | No payment | | |- | style="font-weight:bold;" | 0 | | X | X | | | X |- | style="font-weight:bold;" | 1 | | X | X | | X | |- | style="font-weight:bold;" | 2 | | X | | X | | X |- | style="font-weight:bold;" | 3 | | X | | X | X | |- | style="font-weight:bold;" | 4 | X | | X | | | X |- | style="font-weight:bold;" | 5 | X | | X | | X | |- | style="font-weight:bold;" | 6 | X | | | X | | X |- | style="font-weight:bold;" | 7 | X | | | X | X | |} == Wiring == [[File:Schroefklemmen voor draden Kimus2.jpg|thumb|The screw terminals for a external bell, power, and the phone line.]] 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 == Pictures == <gallery> File:Identificatieplaatje_Kimus2.jpg File:Voorzijde_Kimus2.jpg File:Identificatieplaatje_Kimus2.jpg File:Muntinworp_Kimus2.jpg File:Instelmogelijkheden_Kimus2.jpg File:Hoofdprintplaat_Kimus2.jpg File:Detail_ICtjes_en_EPROM_Kimus2.jpg File:Detail_CDP1802_Kimus2.jpg </gallery> == Useful resources == [https://gathering.tweakers.net/forum/list_messages/2116438] [https://telefoniemuseum.nl/Oude%20toestellen/Munttoestel%20Kimus%202.htm] [https://www.youtube.com/watch?v=slbOgci51Bk]

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