Sometimes the customer controls are hard wired.
Three ways to service
1) test jig
2) flip on side & pull bottom plate. To get at corners remove 3 of the 4
chassis bolts & it kinda swings out.
3) my favorite ! We had heavy roll around carts. that fit a console with 2 feet
extra. Put the right size box there then flip chassis on to it.
We had several crash carts with full Sencore suite to roll up & trouble
shoot.
Most Zeniths had a tuner & control position. Some wires like DGS, SPKR
etc plug onto the solder pots. Usually engraved on chassis or tagged but
good just to remember....
Zenith FBT's did go some but we didnt stock them. Not like RCA's IIRC
we kept 3 different ones on hand.
73 Zeno
LFOD !