TASCAM 688 MONITOR C PCB 52102846-01 it had 8 input channels

it had 8 input channels but to save money they

relays the same but mechanically a bit different please advise

in that machine there was two identical motors but one was screaming like terrible when running

This is the power switch that sits at the back of the unit

TASCAM 688 MONITOR C PCB 52102846-01 it had 8 input channelsBoard from a 688 and maybe common in some others The 688 was really the flagship analogue portastudio amazing what the could get on 1 8 inch tape I was amazed how heavy and how big the machine was must be 15 kilos maybe, Nearly all the boards inside are with connectors so its one that can be serviced easier