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Retronetworking » ISDN » ISDN Video Telephony »

T-View 100 » History » Revision 14

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manawyrm, 03/10/2022 12:36 PM

T-View 100

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

manawyrm has two of these phones, laforge owns one as well.

External photos
Front view of the T-View 100 Back view of the T-View 100

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

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 blind 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 -

Service menu
There is a hidden service menu. Scroll to "Service", press OK, type the number 7.
Enter passcode "3570" and press OK.

Internal photos

Video/Interfacing PCB:
Main video / interfacing PCB

Telephone PCB:
Telephone PCB

Display/Camera PCB:
Display/camera unit PCB

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.

Backside of the T-View 100, cover plate with 6 screws

Backside of the main video / interfacing PCB is visible under the cover plate:
View after removing the cover plate, backside of the main video / interfacing PCB

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

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.
Cover plate over the telephone PCB with 7 screws

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:
Backside of the display/camera unit

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.
Round side cover plates removed on the display/camera unit

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:
Interconnect PCB on the bottom of the display/camera unit

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

Common faults

- 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

- 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

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

- Bad connections
Symptoms: Phone working, no picture, no backlight
Fix: Replug the display assembly a couple of times

- ?
Symptoms: Nothing, black screen, no LEDs, ~500mA current draw
Fix: ?

Bootlog (RS232 Debug)

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$

Updated by manawyrm over 2 years ago · 14 revisions

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