is an overall shot of the center (green) CRT assembly. Note the
two circuit boards attached to it.
is a close-up of the SVM/G (PB9586-5) board attached midway up the
is a closer shot of the right hand side of the SVM/G circuit
board. Note the three plugs. The 4-place plug in the center
(P706B) is the SVM power supply plug. The other end of this
harness connects to the right main circuit board on the floor of
the chassis. This plug brings 120VAC (pin 1), ground (pin 3), and
+11VDC (pin 4) to the SVM circuitry. Pin 2 is not connected (NC).
P706B has been disconnected from the SVM/G board, which removes
power from all three SVM boards on the CRT assemblies. The SVM/R
and SVM/B boards receive power through plugs 708A/B and 709A/B
respectively. Note that I re-routed the P706A/B harness through
the white wire-twist to keep it away from any other components.
is a close-up of the left side of the SVM/G board. The 3 place
plug on the extreme left-rear of the board is P707B. This harness
connects to the left main circuit board in the floor of the
chassis. This harness carries the VM signal (pins 1 & 2) and
ground (pin 3). Though not sure, I'm assuming that this VM signal
loop allows for SVM rate adjustment via the Service/Design menus.
not necessary, but I disconnected P707B at the SVM/G circuit
board. This totally isolates the SVM circuit boards from the rest
of the system.
Note that I made both
disconnections at the SVM/G circuit board. Yes, the board/mounts
are fragile, but with due care the harnesses can be unplugged much
more easily at this point. The opposite end of the P706B harness
would be VERY difficult to access without further disassembly.