Casio TK-7000 Troubleshooting Manual - Page 6
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3) Check the DC/DC convertor in display PCB.
[DC/DC convertor circuit for 7 segment Display Tube at Display PCB E445B-E2]
[DC/DC convertor circuit for Dot Display Tube at Display PCB E445B-E2]
Signal at Q2 position
Q2
Q3
VF1
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Trouble shooting ECR V1.01
Signal at Q3 position
Signal at VF1 position
VD1
Signal at VD1 position
D2
Signal at D2 position