Adjustments (Base Unit And Charger Unit); Adjustment (Base Unit) - Panasonic KX-A144 Series Service Manual

KX-TCD440HGS / KX-TCD440HGT / KX-A144EXS-1 / KX-A144EXS / KX-A144EXT-1 / KX-A144EXT

15 ADJUSTMENTS (BASE UNIT AND CHARGER UNIT)

If your unit have below symptoms, adjust or confirm each item using remedy column from the table.
The base unit does not respond to a call from handset.
The base unit does not transmit or the transmit frequency is off.
The transmit frequency is off.
The transmit power output is low, and the operating distance between base unit and handset is
less than normal.
The reception sensitivity of base unit is low with noise.
The transmit level is high or low.
The reception level is high or low.
The unit does not link.
The unit cannot charge.
*: Refer to Adjustment (Base Unit) (P.40)

15.1. Adjustment (Base Unit)

Please follow the items below when BBIC or EEPROM is replaced.
Items
(A) 2.65 V Supply
Confirmation
(B) 4.0 V Supply
Confirmation
(C) VBACK Status
Confirmation
(D)* BBIC Confirmation
(E)* BBIC Clock Adjustment
(Important)
(F)* Hookswitch Check with
DC Characteristics
Symptom
1. Confirm that the voltage between TP187 and GND is 2.65 V ± 0.2 V.
1. Confirm that the voltage between TP91 and GND is 4.0 V ± 0.2 V.
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.
Connection of checksum value and program number is shown below.
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 10.368000 MHz ± 10 Hz.
1. Connect J1 (Telephone Socket) to Tel-simulator which is connected with 600 Ω.
2. Set line voltage to 48 V at on-hook condition and line current to 40 mA at off-hook condition
of normal 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 0 mA ~ + 2 mA.
Make adjustments in item (A)~(F), (I)~(M)
Make adjustments in item (A)~(E), (H)~(J), (L)
Make confirmation in item (A)~(E), (H)~(J), (L)
Make confirmation in item (H), (K)
Make confirmation in item (K)
Make adjustments in item (O)
Make adjustments in item (N)
Make confirmation in item (A)~(M)
Make confirmation in item (P)
Procedure
40
Remedy*
Check or
Replace Parts
IC2,Q8,C23,
C24,C25,
C26,C27,C38,
R33,R36,
D5,C41,R41,
R42,Q9,
C40,D4,X1,
C32,C33,
C36,C37
D4,C40,Q9,
R41,R42,
C41,D5,C75,
C78,C69,
C66,C67,C76,
IC3
IC2,Q8,C23,
C24,C25,
C26,C27,C38,
R33,R36,
D5,C41,R41,
R42,Q9,
C40,D4,R33,
X1,C32,
C33
IC2,X1,C32,
C33
IC2,IC3,L1,
C48,X1,C32,
C33
IC2,R7,R8,
R9,R10,R77,
Q2,Q3,D2,
C1,C2