Panasonic KX-TG8421EB Service Manual page 51

Items
(Q) Audio Check
(R) Charging Check
(S) TAM Operation Confir-
mation
(T) 2.4V Supply Confirma-
tion VDD2
9.2.2. Check Point (Charger Unit)
Items
(A) Charging Check
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).
Check
Point
- 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 -8 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 -22 dBm ± 2 dBm and that the distortion level is < 5%
at Receiver (Volume Middle, 150 Ω Load).
1. Connect Charge Contact 12 Ω/2 W resistor between charge+ and charge-.
-
2. Measure and confirm voltage across the resistor is 3.10 V ± 0.3 V.
- 1. TAM Confirmation (Execute the command "sendchar VPI").
2. Confirm the returned Value (Value is "DAS7EA 03").
VDD2 1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.2V.
Check
Point
- 1. Connect Charge Contact 10Ω/2 W resistor between charge+ and charge-.
2. Measure and confirm voltage across the resistor is 3.1 V ± 0.3 V.
KX-TG8421E/KX-TG8422E/KX-TG8423E/KX-TG8424E/KX-TGA840E
Procedure
Procedure
51
Check or
Replace Parts
IC7, SA1, L1,
L2, D3, Q3, Q4,
R14, R15, R16,
R17, D21, Q5,
R19, R20, C14,
C56, R117,
R116, C141, R9,
C22, C23
R55, R56, D22,
D23
IC7, IC421,
R424~R429,
C421, C422,
Q421
IC7, Q9, C617
Check or
Replace Parts
R1
D1, F1