A notorious issue with the W55 is blowing the internal 125 mA fuse when accidentally connecting 24V loop power to a shorted transmitter. Manual 19 includes a disassembly diagram with warnings about electrostatic discharge. Earlier manuals simply said "return to service center."
NDDA W55 Manual 19 Document Type: Technical Operations & Service Manual Typical Application: Industrial machinery, specialized equipment, or legacy systems (model number W55) Ndda W55 Manual 19
I couldn’t find a verified or official document specifically titled in public or technical databases. It’s possible there’s a typo, a misremembered model number, or a very niche/internal reference. A notorious issue with the W55 is blowing
Based on standard technical manual formats, Manual 19 likely contains: a misremembered model number