Panasonic KX-TCD455GM, Service Manual

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Items
Adjustment
Point
Procedure* Check
(F)
*
Hookswitch
Check with DC
Characteristics
-
1. Connect J1 (Telephone Socket) to Tel-simulator which is connected with 600 .
2. Set line voltage to 48V at on-hook condition and line current to 40mA at off-hook
condition of nomal telephone.
3. Execute the command "hookoff"
4. Confirm that the line current is 40mA ± 5mA.
5. Execute the command "hookon".
6. Confirm that the line current is 0mA + 0.2mA.
IC2,R7,R8,
R9,R10,R77,
Q2,Q3,D2,
C1,C2,C52
(G)
*
DTMF Generator
Confirmation
-
1. Connect J1 (Telephone Socket) to DTMF tester.
2. Execute the command "hookoff" and "dtmf_up".
3. Confirm that the high frequency (1477.06Hz) group is -6.5dBm ~ -9.5dBm.
4. Execute the command "dtmf_lo".
5. Confirm that the low frequency (852.05Hz) group is -9.0dBm ~ -12.0dBm.
IC2,R32,C22,
R23,C90,C52,
C14,C13,Q6,
R22,R21,R19,
R20,C12,D2,
C1,C2,R77,
D3,R12,Q2,
R7,R8,R9,
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