Panasonic KX-TC2101BXB, Service Manual

Page: 20 / 63

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 43.82MHz ±
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 10dBm. IC401, Q403,
Q405, T403,
DPX401
(E) RX Sensitivity
Confirmation (2nd
IF output)
3ch Talk T401 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
0KHz).
2. Confirm that the reading of AF VTVM is the maximum value (more than
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).
2. Confirm that the reading of AF VTVM is more than 150mV (600
Ω
load).
IC401, Q304
(G) Line Input
Modulation
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).
3. Confirm so that the reading of FM Deviation Meter is 2.7 ± 0.5KHz.
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.
2. Confirm that the S.S.G. output level is -95dBm ~ -100dBm.
IC401,
DPX401
* : The connections of adjustment equipment are as shown in Adjustment Standard (Base Unit) (P.21).
S.S.G. Frequency: 49.86 MHz
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KX-TC2101BXB