View single post by slychiu
 Posted: Wednesday Dec 10th, 2014 06:48 am
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Joined: Saturday Apr 29th, 2006
Location: Singapore
Posts: 5160

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It appears that the offhook detector may not be working

Can you remove the telephone line from TEL IN and leave the TEL OUT connected. Wait for about 1 minute
The "Phone Trouble" warning should come on, ie the keypad should beep fast and the LCD should show "Phone Trouble"

This means the system has detected loss of voltage on the telephone line.

Now lift the handset. You should hear "Phone Trouble" on the phone. If the phone is dead, it means the offhook detection is not working. The CM9000 PCB should be repaired or replaced

What is the serial number on the PCB, you should see P or C followed by 6 numbers
ef P123456

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