KEY TONE
1. In on-hook state, press and hold CAL key 3 seconds, key tone is active when hearing “di”
voice.
2. Press and hold CAL key 3 seconds again, key tone is inactive when hearing “di” voice.
CALCULATOR FUNCTION
In on-hook state, press CAL key, LCD displays 0-, the unit is in calculator state.
The unit is available for operation of “+.-.×.÷”, in the calculator state, #/= key is used as “=” and
the */. key is used as “.”, OUT/× and FLASH/÷ are used as × and ÷ respectively. UP/+ or
DOWN/– key is used as sign of positive/negative.
Eg.1 (10+26) ÷2
1. In on-hook state, press CAL key
2. Press (1, 0, +, 2, 6),÷, 2, #/= keys
3. After calculated, press SET key to quit.
Eg.2 0.5× 0.6-1
1. In on-hook state, press CAL key
2. Press 0, */., 5, ×, 0, */., 6, -, 1, #/= keys
3. After calculated, press SET key to quit.
NOTES
Please unplug telephone line and power (if any) when installing / replacing batteries.
TROUBLESHOOTING
? No voice
+ Check if the handset is on the phone or if the line has terminated.
? Receive only
+ Check if P/T mode is properly set.
Check if the unit is locked (use the key to unlock it)
? Rusty batteries or leakage
+ Remove the rust or wipe away the leakage.
? Noise
+ Check if the circuit is spoilt. (Change the circuit)
Check if the connector is wet or rusty (Change the connector)
? Ring once then disconnect when receiving a call. Dialing function is still available
+ Check if connector is in a moist environment.
Check if too many extensions are used together or the quality of extension is not good
enough (Change the bad extension)
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