Adjustment Of Handset - Panasonic KX-TG3721BXB Service Manual

KX-TG3721BX/KX-TG3722BX/KX-TGA371BX

12.4. Adjustment of Handset

When IC5(BBIC) or IC3 (EEPROM) is exchanged, the Bandgap adjustment and the Frequency adjustment are necessary.
When X1 (X'tal) is exchanged, the Frequency adjustment is necessary.
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Procedure:
1. Open a window of MS-DOS mode from the start-up menu.
2. Change directory to the copied folder.
3. Type "SET_COM 1" from the keyboard (when COM port 1 is used for the connection).
4. Type "sendchar IDR". Check ID code on PC screen.
If OK (ID is displayed), go to advances to the adjustment process.
If NG (ID is not displayed), you have to stop this procedure, and check your PC environment.
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BandGAP Voltage Adjustment:
1. Check BandGap voltage. (TP: +1.8V- GND)
2. If voltage value is 1.8 V ± 0.02 V then OK, go to Frequency Adjustment process.
If voltage value is not 1.8 V ± 0.02 V then, go to step 3.
3. Type "sendchar VDD", you can check registered value of parameter.
When you want to up the voltage: "Value+1".
When you want to down the voltage: "Value-1".
4. Type "sendchar VDD nn", you can register a new parameter value.
5. Please operate step1 to 5 again until the voltage becomes it within the range.
Please confirm the following item when the adjustment does not go well.
Symptom
Can not Adjust Bandgap Voltage
When it does not improve even if the above-mentioned is confirmed, IC5 might be defective.
Please check soldering.
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Frequency Adjustment:
1. Type "sendchar SFR" then set to RF burst mode. (Respons "OK")
2. Check Frequency. (TP: CKM-GND)
3. If Frequency value is 10.368000 MHz ± 41 Hz then OK , finished Adjustment process
- Please turn off the power of PCB board.
If Frequency value is not 10.368000 MHz ± 41 Hz then, go to step 4.
4. You can check registered value of parameter.
When you want to up the frequency: "Value -1".
When you want to down the frequency: "Value +1".
5. Type "sendchar SFR nn nn", you can register a new parameter value.
6. Please operate step1 to 6 again until the Frequency becomes it within the range.
Please confirm the following item when the adjustment does not go well.
Symptom
Can not Adjust RFCLK Frequency Please check
When it does not improve even if the above-mentioned is confirmed, IC5 might be defective.
Please check soldering.
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Battery Monitor Check:
1. Apply 2.25V between BATT+ and BATT-.
2. Execute the command
sendchar PAD
sendchar LED 0
sendchar CRX 0 1
sendchar AD1
It assumes that the return value is XX.
<
a) 6c XX
b) XX: 6A ~ 6B: Need to adjust
XX: 72 ~74: Need to adjust
Write AD value of 2.25 V to EEPROM.
ex) read data: XX=6A, write data: YY=6A
read data: XX=73, write data: YY=73
EEPROM=0009(Low Voltage) write "YY"
Execute the command "wreeprom 00 09 01 YY".
EEPROM =000A (No Voltage) write "YY-C"
Execute the command "wreeprom 00 0A 01 ZZ".
Note:
ZZ = YY-C
No Voltage writing data limit is "00".
c) XX: 00 ~ 69: Reject
XX: 75 ~ FF: Reject
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Battery Low Confirmation:
1. Apply 2.40 V between BATT+ and BATT-.
2. Confirm that there is no flashing of Battery lcon.
3. Apply 2.25 V
4. Confirm that there is flashing of Battery lcon.
Cross Reference:
Power Supply Circuit/Reset Circuit (P.20)
Please check Power Supply Circuit.
CKM (R20)
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71: No need to adjust
+
0.08 V between BATT+ and BATT-.
Example
D:\PNZZTG****>sendchar VDD
08
D:\PNZZTG****>sendchar VDD
OK
D:\PNZZTG****>
item
Example
D:\PNZZTG****>sendchar SFR
0270
D:\PNZZTG****>sendchar SFR
OK
D:\PNZZTG****>
item
56
02 7A