Panasonic KX-TD7685 - Wireless Digital Phone, Service Manual

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KX-TD7685
11 Measurements and Adjustments
11.1. Adjustment for Main Part (Handset)
11.1.1. Required Equipment
11.1.2. Preparation
1. Open the battery cover and remove the battery from Handset.
2. Remove the cabinet cover.
3. Remove the P.C.B. from the cabinet. (Refer to
10.1 Disassembly Instructions of Handset .)
4. Connect the RS-232C cable between PC and Handset.
5. Supply DC 3.8V to Handset.
6. Press the Power Key for 3 seconds to turn on Handset.
11.1.3. Adjustment for 1.8V
1. Measure the voltage at test point CK5 by tester. (Refer to 14.1 Printed Circuit Board of Handset(Main) .)
2. Adjust the voltage within 1.80V +/- 0.02V by Test command "VDD control(VDD)".
Note: Accuracy of voltage 1.8V is important.
Cross Reference:
"VDD control(VDD)": 7.3.1. Select From Command Menu _(A)
Item Service part No. SPECIFICATION/COMMENT
Instrument Frequency counter none PCC has VP-4546A / National
Use the instrument with the same specification as VP-4546A.
Measurement frequency : 10.368/- 10Hz
DC power supply none +3.5V, +3.8V / 500mA for Handset
Oscillator none PCC has LAG-120B / LEADER ELECTRONICS 1kHz/-50dBm
Use the instrument with the same specification as LAG-120B.
Personal Computer with
FLASH PROGRAM none CPU: more than 400MHz
Memory: more than 64MB
HD available space : 100MB
OS: Windows 98, 2000, XP
Other: with serial port
TOOL RS-232C cable PSZZ1TD7896M Serial cable between PC and KX-TD7685 (Same as cable for TD7896)
Maintenance software for PC PSZZ3TD7896M Supplied by Floppy Disk (Same as the software for TD7896)