Re: [Tek 485] No intensity control


marcosjl31@...
 

This is somehow what is expected if I read correctly the service manual : schematic 13 indicates that output of U1560 should measure 14.1V at base of Q1742.

As part of trying to find if some components had failed nearby test point Z OUT DC, I checked Q1772 and Q1752, as well as 1N4152 diodes - CR11775/1776/1777 -

The latter puzzled me as when using diode test function of my DMM, I measured ~0.6V in forward bias, and 1.55V in reverse. But as i'm doing the measurement on circuit, it may be normal.

Jose

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