Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 182)

IM 11M12A01-03E 11-10
To replace the fuse, follow these steps:
(1) Turn off the power to the converter for safe replacement.
(2) Remove the fuse from its holder. With the appropriate flat-blade screwdriver that just
fits the holder cap slot (Figure 11.6), turn the fuse holder cap 90
Њ counterclockwise.
By doing so, you can remove the fuse together with the cap.
Cap
Flat-blade
screwdriver
Fuse
Socket
F11.6E.EPS
Figure 11.6 Removing the Fuse
(3) Check the rating of the fuse and that it satisfies the following:
Maximum rated voltage: 250 V
Maximum rated current: 3.15 A
Type: Time-lag fuse
Standards: UL-, CSA- or VDE-approved
Part number: A1113EF
Place a new, properly rated fuse in the holder together with the cap, and push and turn
the cap clockwise 90
Њ Cwith the screwdriver to complete installation of the fuse.
11.2.2 Cleaning
Use a soft dry cloth to clean any part of the converter during inspection and
maintenance.
11.2.3 Adjust LCD screen contrast
An LCD is built in the ZR402G converter. The contrast of this LCD is affected by its
ambient temperature. For this reason, the LCD is shipped, after adjusting the contrast so
as to become the most suitable in a room temperature(20-30
Њ C). However, when display
on the LCD is hard to see, adjust the LCD contrast by change the resistance of the
variable resistor; its position is shown in Fig. 11.7
Variable register
Figure 11.7