Acom International ACOM Exhibit 8 1000 Podręcznik użytkownika - Strona 12
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5-1 Contrast and Backlighting control
Press the PREV+NEXT buttons simultaneously and hold them for two seconds. The back-lighting of the LCD will light
and the "Contrast=... B.Light=..." screen will appear on the bottom line. Control the contrast of the LCD using the PREV
button in steps from 1 to 9. Control the backlighting of the LCD using the NEXT button in steps from 1 to 5.
Press shortly the PREV+NEXT buttons in order to reach the auto-operate function (see next S.5-2), or leave buttons
unused for 20 seconds if you want to accept these selections only (in order not to change Auto-Operate inadvertently).
5-2 Auto-Operate enabling and disabling
When enabled, this function will save manual actions and operating time for you. It will automatically execute OPERATE
commands every time when needed. The OPER button will be still functional, so you'll be able to change to standby and
back to operate manually at any time. After returning to operate the first time (by pressing OPER button again), the auto-
operate feature will be restored.
In order to enable or disable the auto-operate at all, after a contrast and backlight 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 NEXT to select ON. Press shortly the PREV+NEXT buttons again to accept and
return.
NOTE
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 to copy them press the OPER button while OFF LINE. The backlighting of the LCD will light 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 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 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. 2-1). They are 10A/250V Quick blow, 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 two more small glass fuses (5x20mm,
100mA and 2A slow-blow type) which are not 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.
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