Thorn 9905 Chassis
Model: D|E|R 5511
System: 625 Line
Original List Price : £000.00 ( to be ascertained)
Integrated Circuits: Yes
Another Thorn offering this time in the for of a 9905 offering badged up as a D|E|R (Domestic Electric Rentals). The 9005 is virtually identical to the 9000 using a parallel switched-mode power supply running synchronously with line. A conventional transistor line output stage except that it uses the power supply switching transistor to conduct the latter portion of scan with an efficiency diode conducting the first part. This was known as SYCLOPS (SYnchronous Converter and Line OutPut Stage).
A simple fix this one R735 a 3.9R resistor to the 24V rail was O/C, replaced that and the 24V rail was restored.
Switched Mode PSU & Line Output – 01-558-002
Frame Timbase / Line Oscillator Driver – 01-526-003-010
Syclops Control – PC 756
Sweep Tune – PC 1023-001
Audio Output – PC 502-003
IF Video & Chroma – 01-929-006-129
Not having a 3.9R I made up this little fella.
Bingo! Raster time!