Service manual

Operation of the Line Output Stage
To explain the operation of the line output stage, we use the following start conditions:
• C2433 is charged to max. 141 V (VBAT)
• TS7421 is driven into conductivity.
Figure: Line deflection part 1
Period t1 - t2:
When TS7421 is driven into conductivity, the capacitor voltage of 141 V will be divided
across bridgecoil L5422 and the deflection coil (conn. 0317). Due to the chosen
inductance values, there will be 100 V across the deflection coil and 41 V across L5422.
The linear increasing current in the deflection coil will result in a spot moving from the
center of the picture tube to the right.
The voltage across L5422 will also charge C2421 (41 V - 0.7 V).
Period t2 - t3:
At the moment the LINEDRIVE signal becomes high, TS7421 will stop conducting. In
the coils, a voltage will be induced, trying to maintain the current. The current through
the line deflection coils continues to flow through C2425 and C2421 and the current