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DA100 (50Hz) Chassis – Article for Television Magazine
AV Link
This television chassis has the capability of directly controlling a VCR via the SCART socket or the
VCR controlling the television. In either chase the VCR must be compatible with the ‘AV Link’ system,
also during the installation of the television and VCR it will be necessary to decide whether it is the
television or VCR which has overall control.
VCR controlling the television. In either chase the VCR must be compatible with the ‘AV Link’ system,
also during the installation of the television and VCR it will be necessary to decide whether it is the
television or VCR which has overall control.
Figure 54: AV Link Schematic Diagram
Data from the television to VCR is from IC1001 pin 16 via Q1005 and is outputted from pin 10 of
either the AV-1 or RGB SCART sockets. Data from the VCR is from the same SCART connection but
this time it is fed into IC1001 pin 92 via D1003. D411 provides protection from excess voltage being
applied to the SCART sockets.
either the AV-1 or RGB SCART sockets. Data from the VCR is from the same SCART connection but
this time it is fed into IC1001 pin 92 via D1003. D411 provides protection from excess voltage being
applied to the SCART sockets.
Faults Connected with the Microprocessor
Normally faults associated with the microprocessor cause the television not to function, i.e. turn on or
operate correctly. By checking the signal on pin 36 (ALE), it can be seen that the internal system is
undertaking instruction cycles. This pin changes state at each instruction cycle that the processor
executes, so it is a good indicator that the IC is working. The normal frequency of this square wave
signal is 8.77MHz.
operate correctly. By checking the signal on pin 36 (ALE), it can be seen that the internal system is
undertaking instruction cycles. This pin changes state at each instruction cycle that the processor
executes, so it is a good indicator that the IC is working. The normal frequency of this square wave
signal is 8.77MHz.
Page 53 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
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