<div dir="ltr"><span style="font-size:12.8px">Hi,</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Currently working on an AVR 2 (it's been a while since I last worked on one of these) that's got a TBC problem. I tracked down and replaced the dead chip (A32) that fed clocking to registers at the front of the D-A and found the non working chips (A4 and A56) on the two line delay that I replaced with working spares from a non working board. I appear to now have all 24 bits going into the memory, out again, through the 2 line delay and into the D-A however please see attached photo of TBC out when fed with the ramp from Bd 17. It appears I'm still missing bits. </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Fortunately I have some spare boards and have tried swapping out the A-D, Clock Gen and Burst Store Gen in turn each with no change. I don't have another working D-A. For info I've got the TRW A-D with associated bypass board.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">The machine is better than when I started but not yet fit. If anyone with greater experience has any ideas where I should be looking I'd be grateful for the advice.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Thanks.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">David</div><div style="font-size:12.8px">Engineer, TVT</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><img src="cid:ii_151151fdcafce954" alt="Inline images 1" width="86" height="70" style="margin-right: 0px;"><br></div><div><br></div><br><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"></div></div></div></div></div>
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