Acom 1500, Руководство пользователя, Страница: 20 / 25

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In order to read them press the OPER button while OFF LINE. The display will light at full
brightness and you'll see the beginning of the signatures list. Use NEXT and PREV buttons to
navigate through 7 pairs of screens. For each auto-protection trip there is a pair of
information screens, beginning with nA... and nB... where:
-
"n" is the successive number of the event (nr.I is the latest, nr.7 is the oldest one);
-
A and B mark the first and the second part of an information screen pair.
Two lines, three groups by six symbols (36 symbols in total) are to be copied concerning
every one of the 7 memorized events, from IA-IB through 7A-7B.
To decode the signatures please see S.6-5 (Troubleshooting).
N O T E
After every signature listing the tube warm-up time is reset to I80
seconds regardless of the time being in OFF LINE state.
6. MAINTENANCE
N O T E
If the characters on the VFD are dim, please follow the method of Display
brightness control described in S.5-1.
6-1. Cleaning
W A R N IN G
Do not use solvents for cleaning - they may be dangerous both for
you and for the amplifier paint or plastics.
Do not open the amplifier. Cleaning of the amplifier outer surface can be done with a piece of
soft cotton cloth lightly moistened with clean water.
6-2. Fuses Replacement
If it is necessary to replace the mains fuses, use only standard ones.
The two Primary Mains Fuses of the amplifier are located on the rear panel (Fig. 2-I). They are
of the fast (quick blow) type, 1-1/4 x 1/4 inch Cartridge Fuses, Size "0". Use 20 A for
100-120 VAC operation. Use 16 A for 200-240 VAC operation (15 A standard is also
admissible).
Besides the primary fuses, on the MAINS PCB (inside the amplifier) there are three more,
small glass fuses (5x20 mm
European size):
- one piece of I00 mA 250VAC normal blow, and
- two pieces of 2 A 250VAC slow-blow type.
These fuses should not be replaced by the user. Should one of these fuses be blown, it may
be indicative of other failures. This is a complex and potentially dangerous operation. For
this reason, we recommend this work be carried out by a trained service technician.
6-3. Tube Replacement
A single 4CX1000A/8168 ceramic and metal tetrode is employed in the amplifier.
Replacement is a complex and potentially dangerous operation. For this reason, we
recommend this work be carried out by a trained service technician.