Specifications

CA10 Course Notes
Sharp Electronics (UK) Limited
CE Technical Support Group Page 43
CRT drive circuit
Drive for the CRT cathodes is provided on the CRT base panel. Most of the amplification is carried out
within one IC, IC901 ( TDA6107Q ). To enable IC901 to work correctly it requires a supply of 150V, which
is taken from the main HT off the chopper power supply.
Figure 40 : CRT Drive Amplifier Circuit
From the Y/C processor, IC201, the RGB drive signals connect to IC901 via feed resistors and spike
suppression zener diodes which ensure that any excessive drive variations do not damage the IC. The
outputs from IC901 drive the CRT cathodes directly via the 1.5k current limiting resistors.
Black level clamping is derived during the frame blanking period, a DC level is supplied by monitoring the
earth return current from the internal drive FET’s during this time.