Service manual

signals from CC/OSD are also inserted via the HOP. The video part delivers the RGB
signals to the CRT-panel and the geometry part delivers the H-drive, V-drive, and a
drive-signal for rotation (as a variable DC-level on the V-drive signal).
Both deflection circuits are 'hot' and located on the LSP and are driven by the HOP. To
make the galvanic separation, the line drive is driven via transformer 5410 and the
frame drive via optocoupler 7610.The horizontal output stage generates some supply
voltages, the EHT-, focus- and Vg2-voltages.
The RGB amplifiers on the CRT-panel are integrated in one IC and are supplied with
180V from the LOT.
The SCAVEM circuit modulates transitions of the Luminance (Y) signal on the horizontal
deflection current, giving a sharper picture.
The sound part is built around the MSP345X (Multichannel Sound Processor) for IF
sound detection, sound control and source selection. Amplification is done via an
integrated power amplifier IC, the TDA2616.
The microprocessor, called Painter (OSD, Closed Captioning, and Control) takes care
of the analogue CC input- and output processing. The Painter processor and SRAM are
supplied with 3.3 V, which is derived from the +5VSTANDBY.
The NVM (Non Volatile Memory) is used to store the settings; the Painter is an OTP
(One Time Programmable) chip with programmed ROM-code.
In the N8 there is a separate Standby Supply in order to reduce the Standby power
consumption. During Standby, the Main Supply is switched off (via TS7529). A relay is
used to switch the Degaussing circuit.
The Main Supply, a SOPS supply based on the 'down-converter' principle, generates
the 141 V (VBAT) and the 28 V for the audio part.