This series was designed in 1998-1999 by japanese test equipment firm Advantest. The RF input and a couple things were revised for the A revision a few years later.
The A revision increases the maximum input power from 20dBm to 30dBm.
Using my Lecroy scope to generate a 2mhz square wave. At this point it passes all test except IF Step Amp when not fully warmed up.
After about 40mins of running time self test indicates TOTAL GAIN errors (this is measured through both the RF and IF boards)
Rear view in the card cage. From top to bottom:
CPU, A/D
IF/LOG
RF
CPU and analog acquisition board.
Main CPU is a Motorola 68306 (basically a 68EC000 with a bunch of extra i/o crap, DRAM controller and no FPU)
Can't be assed to figure out how much RAM, not important. Probably 128K or something around there.
1Mbyte NOR flash mfg by Fujitsu (that's the tsop48)
Interesting that the CPU is after the Freescale split (2006 date code) and there's micron DRAM from 1998! Had to be fun sourcing parts for this in 2007.
Not shown is the floppy drive.
A couple custom ADVANTEST asics (which as far as I can tell are NEC gate arrays).
The sony CXD**** chips are IO expanders which are present on the boards probably for bus decoding.
IF/log board. According to the maintenance manual (there is no service manual) the IF is 3.58mhz, or the NTSC colorburst frequency. Why? Why not?
As everything is low frequency here there's no exotic microstrip filters, just through hole varactors and 1206 smds.
Bottom left is IF input coax from RF stage.
Now all that's left is the RF section proper. The covered BNC is the optional 10mhz reference oscillator input.
The top of the RF mainboard. I don't know jack squat about anything here so feel free to add.
Bottom of board. RF block with type N input. If someone says it's OK to open the hood I will (and get pictures) but otherwise cant risk it.
YIG tuned oscillator
There are about 13-14 CMOS analog switches scattered around the boards. I will be replacing those and then seeing how the self tests go after that. This seems to be a common failing point for these units.
Anyway if you have anything to add or point out feel free.