Retronetworking

h1. T-View 100

{{>toc}}

T-View 100 was a video telephone, made by Deutsche Telekom / Siemens.

@manawyrm has two of these phones, @LaForge owns two as well. 

h2. External photos

{{thumbnail(DSC00422.jpg)}} {{thumbnail(DSC00423.jpg)}}

Power supply is called STN20, output DC 22.5V; 0.9A. Center positive, 5.5/2.5mm barrel jack.

The RCA connectors are (from left to right): Audio out, Video out, Video in, Audio in

h3. Mini-DIN / RS232

The Mini-DIN (8pin) connector carries a RS232 serial. It was used to connect to auxiliary devices like relay control boxes (to alert deaf people of calls), VCRs (remote control) and PCs (for firmware updates).

We have a copy of the 1.2 firmware update and the RS232 communication protocol.

RS232 pinout is given _without_  Null-Modem reversal (aka it's meant to be a male connector), reverse RXD/TXD and RTS/CTS for a female connector.

Serial settings (for debug output) seems to be 19200, 8n2.

|_.Mini-DIN|_.RS232|_.RS232 Pin|

| 1 | NC  | - |

| 2 | TXD | 3 |

| 3 | RXD | 2 |

| 4 | RTS | 7 |

| 5 | CTS | 8 |

| 6 | NC | - |

| 7 | GND | 5 |

| 8 | NC | - |

The framing and at least some commands are described in attachment:V24-Control.pdf

h3. Service menu

There is a hidden service menu. Scroll to "Service", press OK, type the number 7.

Enter passcode "3570" and press OK.

"Service" -> 8 is another hidden option for a "Factory SETUP". The passcode is 3745.

h2. Internal photos

Video/Interfacing PCB:

{{thumbnail(IMG_3633.JPG)}}

Telephone PCB:

{{thumbnail(IMG_3644.JPG)}}

Display/Camera PCB:

{{thumbnail(IMG_3656.JPG)}}

h2. Phone disassembly

The bottom cover plate has 6 Phillips screws and is clipped together at the bottom. Use multiple guitar picks to get them free.

The plastic does not seem to be brittle (yet), some force is OK.

{{thumbnail(IMG_3647.JPG)}}

Backside of the main video / interfacing PCB is visible under the cover plate:

{{thumbnail(IMG_3631.JPG)}}

Lift the video / interfacing PCB out by pulling it straight up, it's connected via a rigid interface PCB (but not screwed down):

{{thumbnail(IMG_3634.JPG)}}

Unscrew the 7 Phillips screws attaching the plastic shield. Be careful with the speaker wires on the right, they are not detachable!

Lift the plastic shield out of the way to the right. When re-assembling, make sure the hook-mechanism and speaker are correctly in-place.

{{thumbnail(IMG_3642.JPG)}}

h2. Display/camera disassembly

Disassembling the display/camera unit is a bit tricky. You'll need a 10mm socket (and possibly socket extension)!

Start by removing the 4 screws on the connector: 

{{thumbnail(IMG_3650.JPG)}}

then remove the 3 screws in the top of the unit.

The sides of the display/camera unit are covered with round covers. They can be pulled out with a bit of force.

{{thumbnail(IMG_3652.JPG)}}

Use a 10mm socket to unscrew the nuts on both sides.

Lift the connector cover. This is tricky! Please fill in a good way to do this. The author broke 2 plastic clips by doing it:

{{thumbnail(IMG_3653.JPG)}}

Remove both bolts (and the washers). The swivel piece can now be bent inwards slightly with a bit of force to get it out.

{{thumbnail(IMG_3654.JPG)}}

Unscrew the 2 remaining screws holding the display unit together.

There are clips all around the display/camera unit. Use guitar picks again and open the display.

h2. Common faults

h3.  Faulty display hotbar

Symptoms: Missing (pixel) rows / columns on the (24x2) character LCD. 

Fix: Try and reheat the hotbar (~180°C) with a clean soldering iron tip and a lot of pressure

Symptoms: Garbled characters/stuck bit

Fix: HD44780 interface is connected via Hotbar as well. 

Find out which bits (D0-D7) are affected and solder wires for those bits directly to the LCD

{{thumbnail(IMG_3779.JPG)}}

{{thumbnail(Bildschirmfoto 2022-03-11 um 13.07.27.png)}}

h3. Faulty display

Symptoms: No LCD output at all

Fix: Buy a new LCD. You'll need one with HD44780 ROM code A00 charset (the Japanese/Kana charset). The 0xE1 character should be "ä" (a with Umlauts).

We couldn't find any mechanically 100% compatible model, but the NewHaven NHD-0224AZ-FSW-GBW is electrically and character set compatible. If you want to do the re-work, the following recommendations apply:

* remove the transparent plastic carrier for the old LCD module

* remove the old LCD module (just tear the flex cable from the top side of the board)

* use solder wires to connect the new LCD to vias on the PCB (see picture)

* either fix the contrast voltage to GND, or re-work the existing contrast voltage biasing circuit.  The original Siemens circuit consists of a 5V PWM feeding into a resistive divider of two 24kOhms resistors.  Replace the GND-facing resistor with a 2.2kOms (or even lower).  Play with the contrast settings (+/- buttons while receiver is on-hook) to see if you hit the right voltage range.  Adjust resistive divider as needed.

* re-work the plastic cover that is located between the two boards as needed.  You can either make more space for the LCD module by creatng a cut-out, or you can use it as-is and adjust the spacers on the "video" side.

{{thumbnail(tview-nhd-rework.jpg)}}

h3. Faulty capacitors

Symptoms: Crashing, low display contrast, flickering LEDs, poor video quality, mains hum on the speakers

Fix: Replace all electrolytic capacitors

Remove the old caps using the "Twist method":https://www.youtube.com/watch?v=-1S3F6_g3Sw

|_.Capacity|_.Voltage|_.Count|_.Width x Height (mm)|_.Replacement part|

|220µF|35V|8|10.31x10.31|Nichicon UCL1V221MCL6GS|

|470µF|16V|2|10.31x10.31|Nichicon UCX1C471MCL1GS|

|47µF|35V|6|8.28x8.28|Nichicon UUE1V470MNS1GS|

|220µF|10V|1|8.28x8.28|Nichicon UWG1A221MNL1GS|

|47µF|16V|3|6.60x6.60|Nichicon UCB1C470MCL1GS|

|100µF|10V|1|6.60x6.60|Nichicon UUT1A101MCL1GS|

|2.2µF|35V|2|3.33x3.33|Nichicon UWJ1H2R2MCL1GB|

|10µF|16V|1|3.33x3.33|Nichicon UUT1C100MCL1GS|

h3. Bad connections

Symptoms: Phone working, no picture, no backlight

Fix: Replug the display assembly a couple of times

h2. Bootlog (RS232 Debug)

<pre>

LOut: Header: 1000101, Function: 2a P1: 00000000 P2: 00000000 P3: 00000000

7In : Header: 1000101, Function: 2a P1: 0 P2: 0 P3: 0

'Process BC - version 0.16 - 26/08/98

VCP ALERT : 0xff, 0x0

Send SRAM_NOT_OK to Bruno

VC_uv_Test_conf

-VC Process: Version 26.08.1998 for TST4025

VCP ALERT : 0x0, 0x0

Send SRAM_OK to Bruno

VC_uv_Test_conf

TM process initialized

   20

VCP ALERT : 0x3, 0x13

VCP ALERT : 0x3, 0x12

VCP ALERT : 0x4, 0x1

VC_vb_h221_running_noty

VCP ALERT : 0x3, 0x2

DIn : Header: 2000100, Function: 7 P1: 5000000 P2: 11 P3: da323200

KOut: Header: 1010200, Function: 2 P1: 04fff800 P2: 00000000 P3: 00000000

GIn : Header: 2000100, Function: 3 P1: fff80000 P2: 4025 P3: f8000000

LOut: Header: 1010900, Function: ac P1: 00004025 P2: 00100022 P3: 00000000

$FT$:onhook audio$

$FT$:onhook audio$

LIn : Header: 9010101, Function: a4 P1: 40465424 P2: 3a6f6e68 P3: 6f6f6b00

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 04000000 P3: ff000000

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 08000000 P3: ff000000

KOut: Header: 1010200, Function: 0 P1: 0400000f P2: 0c000000 P3: 00000000

KOut: Header: 1010200, Function: 0 P1: 0400000a P2: bc000000 P3: 00000000

KOut: Header: 1010200, Function: 0 P1: 0400000a P2: 98000000 P3: 05000000

KOut: Header: 1010200, Function: 0 P1: 0400000a P2: 90000000 P3: 00000000

KOut: Header: 1010200, Function: 0 P1: 0400000f P2: 08000000 P3: 00000000

%Out: Header: 1010200, Function: 1 

JIn : Header: 9010101, Function: a6 P1: c04124 P2: 3a6f6e68 P3: 6f6f6b00

KOut: Header: 1010200, Function: c P1: 0000000f P2: 08000000 P3: 00000000

LIn : Header: 9010101, Function: a1 P1: ff014124 P2: 3a6f6e68 P3: 6f6f6b00

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 08000000 P3: ff000000

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 0c000000 P3: 10000000

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 18000000 P3: 0b000000

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 20000000 P3: 08000000

KOut: Header: 1010200, Function: 0 P1: 04000036 P2: 14000000 P3: 0d000000

LIn : Header: 9010101, Function: a7 P1: ff014124 P2: 3a6f6e68 P3: 6f6f6b00

KOut: Header: 1010200, Function: d P1

VC_v

$FT$:User Interface Ready$

$FT$:onhook audio$

$FT$:offhook audio$

$FT$:onhook audio$

$FT$:onhook audio$

$FT$:onhook audio$

$FT$:alerting video$

IIn : Header: 9010101, Function: a6 P1: 15424 P2: 3a616c65 P3: 72746900

KOut: Header: 1010200, Function: c P1: 00000036 P2: 14000000 P3: 0d000000

$FT$:pin authorized$

CIn : Header: 9010101, Function: a3 P1: 30026 P2: 700000 P3: 8200

%Out: Header: 1010200, Function: 1 

$FT$:offhook video$

LIn : Header: 7020100, Function: 23 P1: 40015424 P2: 3a6f6666 P3: 686f6f00

%Out: Header: 1010200, Function: 1 

%Out: Header: 1010200, Function: 1 

KOut: Header: 1010200, Function: 0 P1: 0400004b P2: 5c000000 P3: 01000000

LOut: Header: 1010101, Function: e0 P1: 00000001 P2: 00002904 P3: 00000000

KOut: Header: 1010200, Function: 0 P1: 0400001a P2: 60000000 P3: 00000000

LOut: Header: 1010101, Function: e2 P1: 00000001 P2: 00007530 P3: 00000000

VCP ALERT : 0x4, 0x3

VC_vb_h221_frame_found_noty

DIn : Header: 2000100, Function: 9 P1: 5000000 P2: 11 P3: da323200

KOut: Header: 1010200, Function: 0 P1: 0400006e P2: d4800000 P3: 00000000

KOut: Header: 1010200, Function: 0 P1: 0400006e P2: a8000000 P3: 00000000

%Out: Header: 1010200, Function: 4 

VC_bv_getarray_req

Address: 0x4b24

AIn : Header: 2000100, Function: 5 P1: 20000 P2: 4b240000 P3: b

VCP ALERT : 0x5, 0x1

VC_vb_h242_caps_rcvd_noty

DIn : Header: 2000100, Function: a P1: 5000000 P2: 11 P3: da32340b

%Out: Header: 1010200, Function: 4 

VC_bv_getarray_req

Address: 0x544c

Caps read: 30026

Caps read: 80700000

Caps read: 0

EIn : Header: 2000100, Function: 5 P1: 30000 P2: 544c0004 P3: 30026

VCP ALERT : 0x5, 0xc

VCP ALERT : 0x5, 0x1

VC_vb_h242_caps_rcvd_noty

DIn : Header: 2000100, Function: a P1: 5000000 P2: 11 P3: da323426

%Out: Header: 1010200, Function: 4 

VC_bv_getarray_req

Address: 0x544c

Caps read: 30026

Caps read: 80700000

Caps read: 8280

EIn : Header: 2000100, Function: 5 P1: 30000 P2: 544c0004 P3: 30026

VCP ALERT : 0x5, 0x2

 VC_vb_h242_caps_end_seqa_noty

DIn : Header: 2000100, Function: b P1: 5000000 P2: 11 P3: da323426

%Out: Header: 1010200, Function: 4 

VC_bv_getarray_req

Address: 0x54b0

Caps read: 30026

Caps read: 80700000

Caps read: 8280

EIn : Header: 2000100, Function: 5 P1: 30000 P2: 54b00004 P3: 30026

LOut: Header: 1010900, Function: ab P1: 00030026 P2: 80700000 P3: 00008280

LOut: Header: 1010900, Function: ab P1: 00030026 P2: 80700000 P3: 00008280

KIn : Header: 9010101, Function: a2 P1: 1015424 P2: 3a6f6666 P3: 686f6f26

%Out: Header: 1010200, Function: 4 

%Out: Header: 1010200, Function: 4 

KOut: Header: 1010200, Function: 2 P1: 0400001b P2: 5c700000 P3: 00008280

KOut: Header: 1010200, Function: 2 P1: 0400001b P2: 68700000 P3: 00008280

KIn : Header: 9010101, Function: a2 P1: 1015424 P2: 3a6f6666 P3: 686f6f26

%Out: Header: 1010200, Function: 4 

Send C_NOWAIT not ok

%Out: Header: 1010200, Function: 4 

KOut: Header

VC_bv_ge

HIn : 

HIn 

9In : Hea

LIn : Header: 7020100, Function: 23 P1: 40025424 P2: 3a6f6666 P3: 686f6f00

%Out: Header: 1010200, Function: 1 

%Out: Header: 1010200, Function: 1 

KOut: Header: 1010200, Function: 0 P1: 0400004b P2: 5c000000 P3: 01008280

%Out: Header: 1010200, Function: 4 

LOut: Header: 1010101, Function: e0 P1: 00000002 P2: 00002710 P3: 00000000

VC_bv_getarray_req

VCP ALERT : 0x4, 0x3

VC_vb_h221_frame_found_noty

DIn : Header: 2000100, Function: 9 P1: 5000000 P2: 11 P3: da32320b

%Out: Header: 1010200, Function: 4 

%Out: Header: 1010200, Function: 4 

KOut: Header: 1010200, Function: 2 P1: 0400001b P2: 5c000000 P3: 01008280

KOut: Header: 1010200, Function: 2 P1: 0400001b P2: 68000000 P3: 01008280

VC_bv_getarray_req

Address: 0x544c

Caps read: 20000000

Caps read: 1

Caps read: 10200084

VC_bv_getarray_req

Address: 0x53e8

Caps read: 20000000

Caps read: 1

Caps read: 10200084

HIn : Header: 2000100, Function: 5 P1: 30000 P2: 544c0000 P3: 20000000

HIn : Header: 2

VCP ALERT : 0x3, 0x1

VCP ALERT : 0x3, 0xa

VCP ALERT : 0x3, 0x14

:In : Header: 1010101, Function: e2 P1: 1 P2: 7530 P3: 0

KOut: Header: 1010200, Function: 0 P1: 0400001a P2: 60000000 P3: 01008280

$FT$:onhook video$

LIn : Header: 7020100, Function: 22 P1: 24465424 P2: 3a6f6e68 P3: 6f6f6b00

KOut: Header: 1010200, Function: 0 P1: 0400000a P2: 84000000 P3: 01008280

LOut: Header: 1010101, Function: e1 P1: 00000001 P2: 00000708 P3: 00000000

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 P1: a84 P2: 1 P3: 0

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 P1: a84 P2: 1 P3: 0

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 P1: a84 P2: 1 P3: 0

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 P1: a84 P2: 1 P3: 0

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 P1: a84 P2: 1 P3: 0

KOut: Header: 1010200, Function: 2 P1: 0400000a P2: 84000000 P3: 01008280

8In : Header: 2000100, Function: 3 

8In 

8In : 

8In :

8In 

8In :

8In 

8In :

8In 

8In :

VCP ALERT : 0x5, 0x1

VC_vb_h242_caps_rcvd_noty

DIn : Header: 2000100, Function: a P1: 5000000 P2: 11 P3: da323400

VCP ALERT : 0x5, 0x2

 VC_vb_h242_caps_end_seqa_noty

DIn : Header: 2000100, Function: b P1: 5000000 P2: 11 P3: da323400

%Out: Header: 1010200, Function: 1 

%Out: Header: 1010200, Function: 1 

%Out: Header: 1010200, Function: 1 

%Out: Header: 1010200, Function: 1 

KOut: Header: 1010200, Function: 0 P1: 0400004b P2: 5c000000 P3: 01008280

LOut: Header: 1010702, Function: 26 P1: 0400004b P2: 5c000000 P3: 01008280

KOut: Header: 1010200, Function: 0 P1: 0400000a P2: 840000

KOut: Header: 

VCP 

VCP ALERT : 0x3, 0x2

$FT$:onhook audio$

</pre>

h2. External Camera

There was an official external camera accessory , a Deutsche Telekom 663701-001 (re-branded Minolta EDUKCM-100)

* "FCC report":https://fcc.report/FCC-ID/EDUKCM-100

h2. Firmware

There are four known firmware versions:

* V1.0 (July 1998)

* V1.1 (?)

* V1.2 (December 1998)

* V1.3 (?)

The firmware consists actually of different images for different processors on the unit.

|_.Filename|_.Format|_.Purpose|

|vcvcp.bin|binary|presumably for the video codec/processor|

|vsetrel.abs|srec|for the VSet (telephone) board, derived from ProfiTEl70|

|vcodrel.abs|srec|contains strings related to H.261, H.221 and VCP|

The Firmware update utility running on the PC side is called Fload68k.exe "M68k Flash-Loader V 3.31 (C) 1997 Orsys GmbH" and it talks about three parts:

* "Talkset" (abs format, programmed via SPI or "RS232 direct")

* "VCODEC" (abs format, programmed via via "RS232 direct")

* "VCP" (bin format, separate programming mode "VCP")