Mindray DC-25, Service Manual

Page: 185 / 213

Troubleshooting of Regular Malfunctions 11-7
3 Only one speaker is mute.
Speaker errors Replace the speaker.
4
USB device cannot be
recognized while
connecting to the USB
port
Control panel works well;
Main board malfunction
Replace the main
board.
5
Network disconnected or
abnormal
CPU module or IO interface
board malfunction if there is
no network or setting failure. Confirm by replacing
CPU module and IO
interface board
11.6 Control Panel
11.6.1 Module or Board Related
No. Descriptions Remarks
1 Silicon key
2 Control panel
3 Dual encoder module
4 Single encoder module
5 Trackball module
6 TGC module
11.6.2 Key Points Supporting Troubleshooting
No. Key Points Supporting Troubleshooting Remarks
1 Backlight of control panel To confirm if the control panel is
powered on normally;
2 Key sound of the control panel. To confirm if the buzzer works normally
3 Response to function keys on control
panel
4 Response to trackball operation
5 Response to the sliding potentiometer To confirm if a single sliding
potentiometer or the control panel
PCBA is damaged.
6 Response to each encoder To confirm if a single encoder or the
control panel PCBA is damaged.