Panasonic KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF Service Manual ▷ View online
8.4. Adjustment Standard (Base Unit)
Oscilloscope
(H)
RF Volt
Meter
Meter
T.P ( CH change at test mode)
DC12V or
AC adaptor
AC adaptor
DC Volt Meter
Confirmation of VCO voltage
TX-VCO
RX-VCO
(A), (B)
Loop
SIMULATOR
SIMULATOR
AF OSC
AF Volt Meter
(F)
TXPOWER
TXGND
SSG
Audio
Analyzer
Analyzer
RF
Volt Meter
Volt Meter
Frequency
Counter
Counter
(D)
(C)
(G)
FM Deviation
Meter
Meter
(E)
50
Ω
IC3
IC6
IC2
IC1
Note: (A) - (H) is refered to ADJUSTMENTS (BASE UNIT) (P.23)
KX-
TC120
5RUB
/
KX-TC
1205R
U
W
/
/
KX-TC
1205R
US
/
KX-
TC120
5RUF
25
9 ADJUSTMENTS (HANDSET)
If your unit have below symptoms, adjust or confirm each item using remedy column from the table.
Symptom
Remedy*
The movement of Battery Low Indicator is wrong.
Make confirmation in item (A)
The base unit does not respond to a call from the handset.
Make adjustments in item (B)
The base unit does not transmit or the transmit frequency is off.
Make adjustments in item (C)
The transmit frequency is off.
Make confirmation in item (D)
The transmit power outlet is low, and the operating distance between the base unit and the
handset is less than normal.
handset is less than normal.
Make confirmation in item (E)
The reception sensitivity of base unit is low with noise.
Make confirmation item (F)
Does not link between the base unit and the handset.
Make confirmation in item (G)
The reception level is high or low.
Make confirmation item (H)
The transmit level is high or low.
Make adjustments in item (I)
*: Refer to Adjustment (P.27).
Unit condition:
1. Remove the antenna lead wire from P.C Board of the handset.
2. Power Supply: DC 3.9V (DC power supply)
3. Volume: HIGH (When P.C. Board of handset is in test mode, volume condition is medium. Press “LOCATOR” key once.)
4. Speaker Load: 150
Ω
CH
TX Frequency
RX Frequency
CH3
39.875MHz
30.175MHz
9.1. Test Mode Flow Chart (Handset)
Note:
Refet to CIRCUIT BOARD (Handset) (P.67)
Signal Route (P.44)
26
KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
9.2. How to change the channel
9.3. Adjustment
Adjustment Items Test Mode
Adjustment
Point
Procedure
Check or
Replace
Parts
(A) Battery Low
Confirmation
3ch Talk
-
1.
Set the power supply voltage to DC3.60V, and confirm so that the reading
of oscillosope is High.
of oscillosope is High.
2.
Set the power supply voltage to DC 3.40V, and confirm so that the
reading of oscilloscope is Low.
reading of oscilloscope is Low.
IC1
(B) TX VCO
Voltage
3ch Talk
T6
1.
Adjust T6 so that the reading of the Digital Voltmeter is 1.0V ± 0.1V.
IC1, X1,
T6
(C) RX VCO
Confirmation
3ch Talk
-
•
•
Confirm RX VCO voltage so that the reading of the Digital Voltmeter is
2.9V ± 0.5V.
2.9V ± 0.5V.
IC1, X1,
T6
L6, C24
(D) TX Frequency
Adjustment
3ch Talk
VC1
•
•
Adjust VC1 so that the reading of the frequency counter is 39.875MHz ±
0.1KHz.
0.1KHz.
IC1, VC1
DPX1, T5
(E) TX Power
Adjustment
3ch Talk
T5
•
•
Adjust T5 so that the reading of the RF VTVM (50
Ω
load) is 5dBm ±
1dBm.
DPX1, Q5,
T5
(F) RX Sensitivity
Adjustment
(2nd IF output)
(2nd IF output)
3ch Talk
T3
1.
Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
0KHz).
0KHz).
2.
Adjust T3 so that the reading of RF VTVM is more than 15mV.
DPX1,
T3,IC1,
CF1, CF2
(G) Noise Squelch
Confirmation
3ch Talk
-
1.
Measure the SSG output level when the noise squelch changes from Low
to High. (modulation frequency 1KHz, dev.3kHz)
to High. (modulation frequency 1KHz, dev.3kHz)
2.
Confirm so that the SSG output level is -105dBm.
IC1, DPX1
(H) Speaker
Output Level
confirmation
confirmation
3ch Talk
-
1.
Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
3KHz).
3KHz).
2.
Confirm so that SP output level is 120mV ± 30mV.
(distortion: less than 7%) (volume High).
IC1
(I) Mic Modulation
Factor
Confirmation
Confirmation
3ch Talk
-
1.
Apply a MIC signal (1KHz, 2.4mV at 600
Ω
load).
2.
Confirm so that the reading FM Deviation Meter is 3.1KHz ± 0.4KHz.
IC1, DV1
(J) Data
Modulation
Confirmation
Confirmation
3ch Talk
-
•
•
Confirm so that the reading of the FM Deviation Meter is 5kHz ± 1kHz.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.28).
SSG Frequency: 30.175 MHz
27
KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF
9.4. Adjustment Standard (Handset)
(Component View)
150
Ω
AF Volt Meter (H)
Oscilloscope
(G) Noise Squelch
(A) Battery Low
47
µ
F
AF-
Generator
Generator
+
-
IC2
Note: (A) - (I) is refered to ADJUSTMENTS (HANDSET) (P.26)
KX-
TC120
5RUB
/
KX-TC
1205R
U
W
/
/
KX-TC
1205R
US
/
KX-
TC120
5RUF
28
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