Panasonic KX-TG8421FXB Service Manual page 49

Items
(H)* Hookswitch Check with
DC Characteristics
(I) DTMF Generator Check
(J)* Transmitted Power Con-
firmation
(K)* Modulation Check and
Adjustment
(L)* Frequency Offset Check
Check
Point
- 1. Connect Telephone Socket to Tel-simulator which is connected with 600 Ω.
2. Set line voltage to 48 V and line current to 40mA at off-hook condition of nor-
mal telephone.
3. Execute the command "hookoff"
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command "hookon".
6. Confirm that the line current is less than + 0.8 mA.
- 1. Connect Telephone Socket to DTMF tester. (Load=600 Ω)
2. Link Handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -6.0 dBm ~ -10.0 dBm.
5. Confirm that the low Group is -8.5 dBm ~ -12.5 dBm.
- Remove the Antenna before starting step from 1 to 7.
ANTI_TP 1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Test mode: FP
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
2. Execute the command "sendchar TST".
3. Execute the command "sendchar dmv 2 2".
4. Check that "Signalling Status" has been set to "Locked", then press "ACCEPT
RFPI".
5. Initiate connection from Dect tester ("set up connect")
6. Execute the command "ANT1".
7. Confirm that the NTP value at ANT is 19.0 dBm ~ 25.0 dBm.
- Follow steps 1 to 6 of (J).
ANTI_TP 7.Confirm that the B-Field Modulation is -370 ± 30/ +370± 30 kHz/div & Modu-
lated width
8.Adjust the B-Field Modulation if required. (Execute the command "readmod"
and "wrtmod xx", where xx is the value.)
- Follow steps 1 to 6 of (J).
ANTI_TP 7.Confirm that the frequency offset is < ± 50 kHz.
Procedure
690 kHz using data type Fig31.
49
KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN
Check or
Replace Parts
L1, L2, Q3, R14,
R15, Q4, R16,
R17, D3,
R18~R24,
C15~C17, D21,
Q5, R27, IC7
IC7, R116,
C141, R29, C22,
C23, Q5, D21
IC7,
C802~C806,
C808~C814,
C820, C819,
C822, C823,
C825, C827,
C826, C834,
C851, C853,
C859~C861,
DA801, DA802,
IC801,
L801~L803,
C855~C858,
R801~R807,
R106, R109,
Q9, C617
IC7,
C802~C806,
C808~C814,
C820, C819,
C822, C823,
C825, C827,
C826, C834,
C851, C853,
C859~C861,
DA801, DA802,
IC801,
L801~L803,
C855~C858,
R801~R807,
R106, R109,
Q9, C617
IC7,
C802~C806,
C808~C814,
C820, C819,
C822, C823,
C825, C827,
C826, C834,
C851, C853,
C859~C861,
DA801, DA802,
IC801,
L801~L803,
C855~C858,
R801~R807,
R106, R109,
Q9, C617