Mediana YM6000, Руководство по обслуживанию

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Troubleshooting 49
YM6000 Service Manual
4. The monitor does not operate when disconnected from AC power.
4 ‐ 1 The battery may be discharged. To recharge the battery, connect a power
cord to AC mains over 12 hours (refer to Battery charge in Performance
Verification section).
Note: DC power should not charge the battery. The monitor may be used
with a less than fully charged battery but with a corresponding decrease in
operating time from that charge. The battery may be defective.
4 ‐ 2 If problem persists, replace battery fuse on the power supply assembly.
4 ‐ 3 Inside monitor, check the main cable and ensure that it is connected to the
main board and the power supply assembly
4 ‐ 4 If the problem persists, replace the main board.
5. Battery does not charge.
5 ‐ 1 If the battery fails to hold a charge, replace the battery as indicated in Battery
Replacement.
5 ‐ 2 Open the monitor as described in Disassembly Guide . Verify the power
supply’s LED flashes while on AC. While charging battery, the red LED is
flashed until battery charging is completed, then the red LED is lit
continuously. Replace the power supply assembly if the LEDs are not lit.
Display
The followings are symptoms of problems relating to non ‐ functioning displays, and
recommended actions. If the action requires replacement of a PCB assembly or
module, refer to Disassembly Guide.
1. LCD screen is totally black after system powers ‐ up.
1 ‐ 1 Ensure the inverter wire is connected to the LCD assembly.
1 ‐ 2 Ensure the LCD cable is connected to the LCD assembly and the main board.
1 ‐ 3 If the problem persists, replace LCD assembly.
1 ‐ 4 If the problem persists, replace the main board.
2. LCD screen is illuminated, but no data is visible after system powers ‐ up.
2 ‐ 1 Ensure LCD cable is connected to the main board and LCD assembly.
2 ‐ 2 If the problem persists, replace the LCD cable.
2 ‐ 3 If the problem persists, replace the main board.
2 ‐ 4 If the problem persists, replace the LCD assembly.
3. Display values are missing or erratic.
3 ‐ 1 If the measurement cables are connected, ensure that the cables are properly
connected.
3 ‐ 2 If the problem persists, replace the measurement cables.
3 ‐ 3 If the problem persists, replace LCD cable.
3 ‐ 4 If the problem persists, replace the main board.