And the wire is the red striped one in Stephens picture that runs in front of the R1431 resistor over to the bundle, and then up to the CRT.
I see now what they did, and I was distracted by the relocation of the circuitry, not that it was missing. And the CRT tube schematic was updated to be a little more explicit.
And now I'm that much more clear on the early/late difference. And still find it interesting that my scope SN B177xxx is the later layout, not the earlier. Perhaps coinciding with CRT part number change at SN B010500? But that's not necessarily so either.
Dave
toggle quoted message
Show quoted text
On Tuesday, April 6, 2021, 02:50:06 PM PDT, Dave Peterson via groups.io <davidpinsf@...> wrote:
Eureka! There it is, right in front of me.
Dave
? ? On Tuesday, April 6, 2021, 02:26:57 PM PDT, Raymond Domp Frank <hewpatek@...> wrote:
On Tue, Apr? 6, 2021 at 09:55 PM, Dave Peterson wrote:
I was wondering if you can see what's driving the wire to pin 12 of the CRT.
The early 070-1330-00 service manuals do not appear to have the necessary
components in the board diagrams for A9.
Sure it does.
We're talking about VR1434 and C1434 in the CRT schematic.
Figure 7-17 shows them just to the right of the space between the long ceramic combined resistor R1431? and C1404, right above C1404 and CR1404, printed diagonally.
Raymond