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SUBJECT: No Display
PREPARED BY: S.MANO
CHECKED BY: S. Hamano
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
If the transistor "Q7" on the PCC power pack becomes defective due to heating, the
following phenomenon occurs:
The operation panel indicates nothing. This is because the FU3 (fuse for 24V dc line) on
the DC power supply board is blown. This is caused by excessive current due to defective
transistor "Q7" on the PCC power pack.
Under this condition, if the FU3 is replaced without replacing the PCC power pack, the
FU3 may be blown again.
To improve the durability of the PCC power pack, a heat sink has been added to transistor
"Q7" on the PCC power pack.
This improvement is implemented to the mass-production machines from the following
serial number.
Japan production
A053-19
A053-22
A053-25
A053-26
A053-27
A053-29
The part number of the PCC power pack is the same after the modification. (The suffix of
the improved power pack is "A").
Technical Bulletin
Revision of service manual
Information only
Other
2723100001~
2303110101~
2303100001~
3A01130001~
2723100026~
2723100076~
FROM: 2nd Technical Support Section
MODEL: F40
REI production
A053-15
5834700001~
A053-17
2723470204~
No. RTB-018
DATE: Mar. 15, '94
PAGE: 1 of 1
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