How to test a 155-0155-00 or 155-0120-00 from a TEK 455? #file-notice
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After getting the LV rails in order on this old scope, there is no vertical deflection. The trace sweeps horizontally just fine. Looking in the service manual, and following the troubleshooting chart, it says to 'check preamplifier and switching circuits', which has either a 155-0155-00 or 155-0120-00, 40-pin IC at the centre of the circuitry. Does anyone know of any way to test this IC, or is it just a case of confirming that all the pin voltages covered in the manual are present and correct? The service manual can be found here... /g/TekScopes/files/455%20Service%20Manual.pdf ...and the relevant schematic is located on pages 197 and 198 James |
James55