Adjustment Of Base Unit - Panasonic KX-TG3711BXB Service Manual

KX-TG3711BX/KX-TG3712BX/KX-TG3719BX/KX-TGA371BX

12.3. Adjustment of Base Unit

When IC501 (BBIC) or IC611 (EEPROM) is exchanged, the Bandgap adjustment and the Frequency adjustment are necessary.
When X501 (X'tal) is exchanged, the Frequency adjustment is necessary.
L
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 RFR". 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.
L
BandGAP Voltage Adjustment:
1. Check BandGap voltage. (VDD1-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, IC501 might be defective.
Please check soldering.
L
Frequency Adjustment:
1. Type "sendchar SFR" then set to RF burst mode. (Respons "OK")
2. Check Frequency. (STM/CKM/P15 - 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, IC501 might be defective.
Please check soldering.
Cross Reference:
Power Supply Circuit/Reset Circuit (P.13)
item
Please check Power Supply Circuit.
item
STM/CKM/P15 (R508)
50
Example
D:\PNZZTG****>sendchar VDD
08
D:\PNZZTG****>sendchar VDD 09
OK
D:\PNZZTG****>
Example
D:\PNZZTG****>sendchar SFR
0270
D:\PNZZTG****>sendchar SFR 02 71
OK
D:\PNZZTG****>