Panasonic KX-TC2105RUB / KX-TC2105RUS / KX-TC2105RUT / KX-TC2105RUW Service Manual ▷ View online
**: Refer to Adjustment (P.23).
Note:
*CPU: IC701
*RF IC: IC801
*: Each measurement points are shown in CIRCUIT BOARD (BASE UNIT) (P.59) or CIRCUIT BOARD (HANDSET) (P.61)
6.5. Check Handset Transmission
Cross Reference:
SIGNAL ROUTE (P.41)
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KX-TC2105RUB / KX-TC2105R US / KX-TC2105R UT / KX-TC2105RUW
Cross Reference:
SIGNAL ROUTE (P.41)
6.6. Check Handset Reception
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KX-TC2105RUB / KX-TC2105R US / KX-TC2105R UT / KX-TC2105RUW
Note:
**: Refer to the above table.
7 ADJUSTMENTS (BASE UNIT)
If your unit has below symptoms, adjust or confirm each item using remedy column from the table.
Symptom
Remedy*
The base unit does not respond to a call from handset.
Make adjustments in item (A)
The base unit does not transmit or the transmit frequency is off.
Make adjustments in item (B)
The transmit frequency is off.
Make confirmation in item (C)
The transmit power output is low, and the operating distance between the base unit and
the handset is less than normal.
the handset is less than normal.
Make adjustments in item (D)
The reception sensitivity of base unit is low with noise.
Make confirmation in item (E)
The transmit level is high or low.
Make confirmation in item (F)
The reception level is high or low.
Make confirmation in item (G)
The unit does not link.
Make confirmation in item (H)
*: Refer to Adjustment (P.20).
7.1. Test Mode Flow Chart (Base Unit)
The operation-flow of Test mode and main check items are shown below.
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KX-TC2105RUB / KX-TC2105R US / KX-TC2105R UT / KX-TC2105RUW
7.2. How to change the channel
Note:
Refer to Adjustment Standard (Base Unit) (P.21) for connection.
7.3. Adjustment
Adjustment Items Test Mode
Adjustment
Point
*Procedure
Check or
Replace
Parts
(A) RX VCO
Adjustment
3ch Talk
T404
•
•
•
•
Adjust T404 so that the reading of the Digital Voltmeter is 1.5 ± 0.3 V.
IC401, T404,
C446
(B) TX VCO
Adjustment
3ch Talk
T402
•
•
•
•
Adjust T402 so that the reading of the Digital Voltmeter is 1.5 ± 0.3 V.
IC401,
DV401,
T402
(C) TX Frequency
Confirmation
3ch Talk
-
•
•
•
•
Confirm so that the reading of the frequency counter is 30.175MHz ±
700Hz.
700Hz.
IC401, X401,
DV401,
C440,
C441
(D) TX Power
Adjustment
3ch Talk
T403
•
•
•
•
Adjust T403 so that the reading of the RF VTVM is more than 8dBm.
IC401, Q403,
Q405, T403,
DPX401
(E) RX Sensitivity
Confirmation (2nd
IF output)
IF output)
3ch Talk
T401
1.
Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
0KHz).
0KHz).
2.
Confirm that the reading of AF VTVM is the maximum value (more than
20mV).
20mV).
DPX401,
T401,
CF401,
CF402
(F) Line Output Level
Confirmation
3ch Talk
-
1.
Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
3KHz).
3KHz).
2.
Confirm that the reading of AF VTVM is more than 600mV (600
Ω
load).
IC401, Q304
(G) Line Input
Modulation
Confirmation
Confirmation
3ch Talk
-
1.
Input via loop simulator 1.0KHz, 55mV (measured at T-R) signal.
2.
Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
0KHz).
0KHz).
3.
Confirm so that the reading of FM Deviation Meter is 2.4 ± 0.4KHz.
IC401,
DV401
(H) Noise Squelch
Confirmation
3ch Talk
-
1.
Measure the S.S.G. output level when the noise squelch changes from
Low to High.
Low to High.
2.
Confirm that the S.S.G. output level is -105dBm ~ -110dBm.
IC401,
DPX401
* : The connections of adjustment equipment are as shown in Adjustment Standard (Base Unit) (P.21).
S.S.G. Frequency: 39.875 MHz
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KX-TC2105RUB / KX-TC2105R US / KX-TC2105R UT / KX-TC2105RUW
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