ERROR 688 80

Which product (make and model) are you referring to?

Its from a Siemens AXIOM ICONOS R100

Error 688 APID 80

Meaning:
No dose signal from the VIDEOMED DI/DIC
in case of a B-signal fluoro with B-Signal iontomat input there is no signal detected, serial cable of Videomed DI defective or invalid configuration to B-Signal where no B-signal is required (e.g. for Videomed C)

Possible causes and action:
Check connection between VIDEOMED DI/DIC and generator.

VIDEOMED DI/DIC defective

Check image intensifier output
Remove camera head from image intensifier. Release FL in the Service mode.

See system configuration RX63-055.034... "PLSX adjustment" chapter. The image must appear in the image intensifier output window with FL ON.
If not, then the I.I. circuit (I.I. voltage supply) is defective.
If yes, VIDEOMED DI/DIC is defective.

D100 defective