Adjustments (Handset); Adjustment (Handset); Adjustment Standard (Handset) - Panasonic KX-TCD445BXS Service Manual

KX-TCD445BXS / KX-TCD445BXT / KX-TCD445BXF / KX-A144BXS / KX-A144BXT / KX-A144BXF /

15 ADJUSTMENTS (HANDSET)

If your unit have below symptoms, adjust or confirm each item using remedy column from the table.
The movement of Battery Low indicator is wrong.
The handset does not respond to a call from base unit.
The handset 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.
Does not link between base unit and handset.
The reception level is high or low.
The transmit level is high or low.
*: Refer to Adjustment (Handset) (P.52)

15.1. Adjustment (Handset)

Please follow the items below when BBIC or EEPROM is replaced.
Items
(A) 4.0V Supply
Confirmation
(B) VBACK Status
Confirmation
(C) BBIC Confirmation
(D) Charge Control Check &
Charge Current Monitor
Confirmation
(E)* Charge Detection (OFF)
Confirmation
(F)* Battery Monitor
Confirmation &
Adjustment (Important)
(G) Battery low Confirmation
(Important)
(H)* BBIC Clock Adjustment
(Important)
Symptom
1. Confirm that the consumption current is < 200mA, that is, there is no short circuit.
2. Confirm that the voltage between TP4V and GND is 3.9V ± 0.2V.
1. Confirm that the voltage between TPVBACK 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. Apply 6V between TPCHG(+) and TPCHG(-) with current limit of PSU to 250mA.
2. Confirm that the charge current is ON/OFF.
3. SW to decrease current limit of PSU to 100mA.
4. Confirm that the charge current is stable.
1. Stop supplying 6V to TPCHG(+) and TPCHG(-).
2. Execute the command "charge".
3. Confirm that the returned value is 0x00 (hex).
1. Apply 2.3V ± 0.005V between TPBATT(+) and TPBATT(-) with DC power.
2. Execute the command "deactmac" to stabilize the value.
3. Then, execute the command "readbatt". The returned value is XX.
4. Confirm that XX is between 98 and A8
98 < XX < A8 (Hex)
(If XX is out of range, change BBIC)
1. Apply 2.40V between TPBATT(+) and TPBATT(-).
2. Confirm that there is no Speaker sound (Battery low alarm).
3. Apply 2.20V between TPBATT(+) and TPBATT(-).
4. Confirm that there is Speaker sound (Battery low alarm).
1. Apply 2.6V between TPBATT(+) and TPBATT(-) with DC power.
2. Execute the command "deactmac" .
3. Execute the command "conttx" .
4. Input Command "rdeepron 00 01 01", then you can confirm the current value.
5. Adjust the frequency of TPMCLK executing the command.
"setfreq 00 xx (where xx is the value)"
so that the reading of the frequency counter is 10.368000MHz ± 10Hz.
Make confirmation in item (A)~(C), (F)~(G)
Make adjustments in item (A)~(C), (H), (J)~(N)
Make adjustments in item (A)~(C), (H)~(K), (M)
Make confirmation in item (A)~(C), (H)~(K), (M)
Make confirmation in item (I), (L)
Make confirmation in item (L)
Make confirmation in item (A)~(C), (H)~(N)
Make adjustments in item (O)
Make adjustments in item (P)
Procedure
52
Remedy*
Check or
Replace Parts
IC1,F1,R21,
R4,C33,L2,
D1,C15,C2,
C14,Q1,R3,
R2,D2,R22,
C26,X1,C16,
C17
IC1,R11
IC1,X1,C16,
C17
IC1,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
IC1,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
IC1,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
IC1,F1,R21,
R4,C33
IC1,L3,C57,
IC3,X1,C16,
C17