Getting code A0 - AT&T 1818 Corded Phone

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

This is not a fault with its remote control. The main board to your TV should be checked. Contact any service technician. If you wish to get more details, check the site linked here.
http://electronicshelponline.blogspot.com/

Error Code A0 - Error occurred during carousel movement (Position Not Found). Could be caused by a missing or misaligned cartridge carrier, or an obstruction, or unexpected cartridge in either the carousel path or Import/Export slot.
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Remove the power cable and SCSI cables then try open the top cover. Check and see if there are any tape blocking or obstructing the movement. Sometimes it works sometimes it doesnt. I have 5 of these devices, few of them were replaced as its not working anymore due to these codes and as they are pretty obsolete, its not worth to repair them anymore.

P0793....Intermediate Shaft Speed Sensor Circuit No Signal

P0722....Output Speed Sensor Circuit No Signal

would need a manual to know where these sensors were to be honest

ntell
0=5A 35 D6 3B 4D A0 75 EC
1=DB 7A A2 F2 4B 12 7E 59
tw
0=3F 32 37 03 D0 73 84 84
1=C6 64 1D EF 47 5A 0E EF
cw
0=F 1E 90 1B EA 7F A0 26
1=60 1F 48 73 19 D6 CA 99

whos your provider??

CODES FOR DEC 2ND TELEWEST

3F 32 37 03 D0 73 84 84
C6 64 1D EF 47 5A 0E EF


NTL CODES DEC 2ND

54 01

5A 35 D6 3B 4D A0 75 EC
DB 7A A2 F2 4B 12 7E 59


C+W CODES DEC 2ND

5C 01

2F 1E 90 1B EA 7F A0 26
01 54 B4 A5 79 46 CD AA


THERE YA GO HUN HOPE HELPS YA

17:55 30/11/08
CW KEYS
5C 01
00=2F 1E 90 1B EA 7F A0 26
01=60 1F 48 73 19 D6 CA 99

TW KEYS
5A 01
00=B7 19 92 E2 9B 15 AF 96
01=C6 64 1D EF 47 5A 0E EF

PURE KEYS
54 01
00=5A 35 D6 3B 4D A0 75 EC
01=28 98 21 38 22 BC B9 EF