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Items
(B)
4.0V Supply
Confirmation
(C) VBACK Status
Confirmation
(D)
BBIC
*
Confirmation
Connection of checksum value and program number is shown below.
(E)
BBIC Clock
*
Adjustment
(F)
Hookswitch
*
Check with DC
Characteristics
(G)
DTMF
*
Generator
Confirmation
1. Confirm that the voltage between TP91 and GND is 4.0V ± 0.2V.
1. Confirm that the voltage between J102 and GND is 0V ± 0.4V.
1. BBIC Confirmation (Execute the command "getchk").
2. Confirm the returned checksum value.
1. Execute the command "deactmac".
2. Execute the command "conttx".
3. Input Command "rdeeprom 00 00 02", then you can confirm the current value.
4. Adjust the frequency of TP1 executing the command "setfreq 00 xx (where xx is the value)" so that
the reading of the frequency counter is 10.368000MHz ± 3Hz.
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 + 2mA.
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 -8dBm ± 2dBm.
4. Execute the command "dtmf_lo".
5. Confirm that the low frequency (852.05Hz) group is -10dBm ± 2dBm.
Procedure
36
Check o
Replac
Parts
D4, C40,
R41, R4
C41,
D5, C75,
C69, C6
C67,
C76, IC
IC2, R5
IC2, X1, C
C33
IC2, IC3,
C48, X1, C
C33
IC2, R7,
.
R9, R10 ,
Q2, Q3, D
C1, C2
IC2, R3
C22,
R23, C8
C14,
C13, Q6,
R21, R1
R20,
C12, D2,
C2, R77,
R12, Q2,
R8, R9, R
Q3
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