Panasonic KX-TGA840FXN, Service Manual

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KX-TG8421HGN/KX-TGA840FXN
9.2.2. Check Point (Charger Unit)
Note:
After the measuring, suck up the solder of TP.
The connection of adjustment equipment is as shown in
Adjustment Standard (Charger Unit) (P.64).
( Q ) Audio Check - 1. Link with Handset.
2. Input -45dBm/1kHz to MIC of Handset.
Measure the Level at Line I/F and distortion level.
3. Confirm that the level is -9.0 dBm ± 2 dBm and that the distortion level is < 5%
at TEL Line (600 Ω Load).
4. Input -20 dBm/1 kHz to Line I/F.
Measure the level at Receiver of Handset and distortion level
(*Receive volume set to second position from minimum).
5. Confirm that the level is -24.5 dBm ± 2 dBm and that the distortion level is <
5% at Receiver (Volume Middle, 150
Ω
Load).
IC7, SA1, L1,
L2, D3, Q3, Q4,
R14, R15, R16,
R17, D21, Q5,
R19, R20, C14,
C56, R117,
R116, C141, R9,
C22, C23
( R ) Charging Check - 1. Connect Charge Contact 12
Ω
/2 W resistor between and charge-.
2. Measure and confirm voltage across the resistor is 3.10 V ± 0.3 V.
R55, R56, D22,
D23
( S ) TAM Operation Confir-
mation
- 1. TAM Confirmation (Execute the command "sendchar VPI").
2. Confirm the returned Value (Value is "DAS7UN_02"). IC7, IC421,
R424~R429,
C421, C422,
Q421
( T ) 2.4V Supply Confirma-
tion VDD2
VDD2 1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.2V. IC7, Q9, C617
Items Check
Point
Procedure Check or
Replace Parts
( A ) Charging Check - 1. Connect Charge Contact 12 Ω /2 W resistor between and charge-.
2. Measure and confirm voltage across the resistor is 3.1 V ± 0.3 V.
R1, F1
Items Check
Point
Procedure Check or
Replace Parts