Specifications

14
In order to enable or disable the Auto-Operate at all, after a contrast and back-light selection (see the
previous S.5-1), continue with pressing shortly the PREV+NEXT buttons. The "Auto Operate = ..." screen will
appear on the bottom line. Use the PREV button to select OFF or use the NEXT button to select ON. Press
shortly the PREV+NEXT buttons again to accept and return.
N O T E
If LCD back-lighting or contrast are too low, thus no characters are seen on the LCD, execute S.5-1 first to
obtain a readable display. All selections you make are stored in the nonvolatile memory of the amplifier and
are used at the next power-on. If no selection is made for 20 seconds, the currently existing selection is
accepted and the function is left automatically.
5-3. Reading Auto-protection Signatures
On every Hard Fault protection trip of the amplifier, signature information is stored in its nonvolatile memory.
The 7 most recent auto-protection trip signatures related to the amplifier internal status are stored there,
which you can copy and forward to your dealer for diagnostics.
In order to read and copy them press the OPER button while "OFF LINE". The back-lighting of the LCD will
light and you'll see the beginning of the signatures list. Use the 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 number of the event (nr.1 is the last, 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 1A-1B 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 150 seconds regardless of the time being in
"OFF LINE" state.
6. MAINTENANCE
If no characters are seen on the LCD at power on maybe its contrast needs adjustment - see S.5-1.
6-1. Cleaning
W A R N I N 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 surfaces can be done with a piece of soft cotton
cloth lightly moistened with clean water.
To clean the air filter (located on the air-intake opening of the rear panel), remove the plastic frame and wash
the plastic foam with water. Re-install it after drying. Clean it periodically, depending on the circumstance dust
and amplifier use.
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. 2-1). They are 10A/250V for
200-240 VAC operation, and 20A/250V for 100-120 VAC operation, Quick-Blow type (Fast Acting), 1-1/4 x
1/4 inch Cartridge Fuses, Size "0" Ceramic.
Besides the primary fuses, on the MAINS PCB (inside the amplifier) there are three more small glass fuses
5x20mm, Slow-Blow type (F1-200mA, F2 and F3-2A) which are not replaced by the user. This is a