FujiFilm CR-IR341 Service Manual page 665

1 2
C
ONTENTS
10.3 Checking and Replacing PMT08A Board
CAUTION
When servicing any printed circuit board, be sure to wear an anti-static wristband to ensure
proper grounding. If not, static electricity built on the human body may cause damage to electric
parts mounted on the board.
Checks
CAUTION
Before removing the covers, be sure to turn OFF the high-voltage switch. If the machine is
powered ON with any of the covers removed, the photomultiplier will be damaged.
To check the PMT08A board, the SCN08A board should be first checked before checking the
log amp and high-voltage power supply sections of the PMT08A board.
If any of the voltages measured is out of spec as a result of the checks on the log amp and
high-voltage power supply sections of the PMT08A board, then replace the PMT08A board.
Checks on log amp section
(1) Check the SCN08A board.
"10.1 Checking and Replacing SCN08A Board"
If the SCN08A board is normal, proceed to step (2).
If the SCN08A board is faulty, replace it.
(2) Make sure that the connectors (CN5, CN6) of the SCN08A board have been locked.
(3) Verify that the no-fuse breakers (NFB2, 4) of the SCN08A board are in their shorted
condition.
Push the no-fuse breaker button several times to place the breaker in its depressed
condition.
NOTE
With board version J or later, the no-fuse breaker (NFB) is replaced with the fuse.
Thus, make sure that the fuse has not been blown.
CN6
CN5
009-051-06
009-051-04
04.20.2001 FM3006
05.31.99 FM2460
3 4 5 6
SCN08A board
NFB4
NFB2
FR1H1802.EPS
CR-IR341 Service Manual
7 8 9 10
MC - 174
MC - 174