HP 8340A Service Manual page 222

Refer to the REPAIR PROCEDURES description in the beginning of
Section VIII.
Disengage W3 from where it connects to
the YO Loop via a hole in the motherboard
(refer to Figure 8I-8, View C,
Section)
or damage to the instrument will result.
When replacing the YO Loop assembly be
careful not to smash the ribbon
connector, A50Wl.
Model 8340A
-
REPAIR PROCEDURES
before lifting out the YO Loop
Scans by HB9HCA and HB9FSX
Service
in the RF
8-303/8-304