Almost Dead HP-81

[fxsuarezc]

Hello!

Some time ago, i bought (locally) an HP-81 with the portable case, manuals, etc.
The Calculator is "almost" dead.
When turned on, the drum printer rotates and
a very bright "0" appears on the screen, the keyboard is inoperative.

I bought the "manual" (actually, it's the printer's manual)
and check +15V, -12 and +6V are OK. No noise on the voltages.
(I have a 10Mhz scope to check)

The Clock signal is about 800Khz (almost 1Mhz but it's not xtal so i think it's OK).
Some pins in the father/display board are pulsing.
I was able to find the sync pulses from the printer are OK.
The clock pulses from the father board are OK.

Some "clock" signal from 8 pin chip labeled "1127-3910-7" (pin 8)
appears funny, doesn't like me
(appears to be a clock signal but the pulses doesn't start fr om 0 to 6V, are from 5 to 6V)
and this signal repeats in many chips in the motherboard.

The "SYNC" test point in the board it's always high.
The "ENABLE" test point is always high (no pulses).

What is this 8 pin chip? (clock driver?)

There is any chance to fix this beautiful machine?

Thanks a lot!