I bought this timer from a car boot sale for the princely sum of fifteen pounds. The purchase intention was to automate recordings from FM radio, as all my recording decks could be set to auto-start in record mode from power-on.
Perhaps unsurprisingly as a second-hand item it didn’t have promising reliability.
I found several dry solder joints in the filament connections for the electro-fluorescent display, they caused flicker.
Later some low resistance conductivity (approx 20Kohm) ‘appeared’ between contacts of the main rotary mode selection switch where they should have been isolated. That caused the all-in-one ‘clock’ IC, constructed around pulse sensitive high impedance CMOS circuitry, to randomly set the time to strange values rather than keeping it!
I’ve now fixed all that and until the next breakdown occurs the unit operates as a convenient main power switch to the various ‘wall-wart’ adaptors that power my turntable and it’s preamplifier, the Technics tuner, and the MiniDisc recorder. For nowadays timer recording from the radio is a thing of the past now that the same programmes are also available on the Internet.
BTW If you are trying to fix one of these, my scribbled notes and pinout details for the MN6076 are here.