Panasonic KX-TC1245RUB Service Manual ▷ View online
Cross Reference:
Telephone Line Interface (P.54).
Check Link (P.34)
NOTE:
DSP is IC301.
7.11. Bell Reception
Cross Reference:
Check Link (P.34)
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KX-TC1245RUB
Note :
* Refer to the above table.
** Signal Route (P.57)
Cross Reference :
Check Link (P.34)
8 ADJUSTMENTS (BASE UNIT)
If your unit have below symptoms, adjust or confirm each item using remedy column from the table.
Symptom
Remedy *
The base unit dose not respond to a call from handset.
Make adjustments in item (A)
The base unit dose 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 base unit and handset is
less than normal.
less than normal.
Make confirmation 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 adjustments in item (G)
The unit does not link.
Make confirmation in item (H)
* : Refer to Adjustment (P.39)
8.1. Test Mode Flow Chart (Base Unit)
The operation-flow of Test mode and main check items are shown below.
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KX-TC1245RUB
8.2. How to Change the Channel
8.3. Adjustment
Adjustment Items Test Mode
Adjustment
Point
Procedure*
Check or
Replace
Parts
(A) RX VCO
Adjustment
CH10 Talk
T401
•
•
Adjust T401 so that the reading of the Digital Voltmeter is 1.7V ± 0.1V.
IC401,
T401,
C439
(B) TX VCO
Adjustment
CH10 Talk
T501
•
•
Adjust T501 so that the reading of the Digital Voltmeter is 1.7V ± 0.1V.
IC501,
VD501,
T501
(C) TX Frquency
Confirmation
CH10 Talk
-
•
•
Confirm so that the reading of the frequency counter is 30.300MHz ±
0.7kHz.
0.7kHz.
IC501,
X401,
T501,
T501,
VD501,
C430,
C431
(D) TX Power
Adjustment
CH10 Talk
T502
•
•
Adjust T502 so that the reading of the RF VTVM is more than 8dBm.
IC501,
Q502,
DUP501,
T502
(E) RX Sensitivity
Confirmation (2nd
IF output)
IF output)
CH10 Talk
-
1.
Apply 60dBuVemf output from S.S.G. (modulation frequency 1kHz, dev.
0kHz).
0kHz).
2.
Confirm that the reading of RF VTVM is the maximum value (more than
20mV)
20mV)
DUP401,
CF401,
CF402
(F) Line Output Level
Confirmation
CH10 Talk
-
1.
Apply 60dBuVemf output from S.S.G. (modulation frequency 1kHz, dev.
3kHz).
3kHz).
2.
Confirm that the reading of AF VTVM is -1dBm ± 2dBm (600
Ω
load).
IC401
Q110
(G) Line Input
Modulation
Adjustment
Adjustment
CH10 Talk
VOL402
1.
Input via loop simulator 1.0kHz, -20dBm (measured at T-R) signal.
2.
Apply 60dBuVemf output from S.S.G. (modulation frequency 1kHz, dev.
0kHz).
0kHz).
3.
Adjust VOL402 so that the reading of FM Deviation Meter is 3.0kHz ± 0.2
kHz.
kHz.
IC401,
VD501,
VOL402
(H) Noise Squelch
Confirmation
CH10 Talk
-
1.
Measure the SSG output level when the noise squelch changes from Low
to High.
to High.
2.
Confirm that the SSG output level is -5 ~ +10dBuVemf.
IC401,
DUP401
* : The connection of adjustment equipment are as shown in Adjustment Standard (Base Unit) (P.40).
SSG Frequency : 40.00 MHz.
39
KX-TC1245RUB
8.4. Adjustment Standard (Base Unit)
IC501
Spectrum
Analyzer (D)
Analyzer (D)
FM Deviation
Meter (G)
Meter (G)
RFTX
TXGND
TX Power
TX Freq
RXGND
RXVCO
Frequency
Counter (C)
Counter (C)
RF_S.S.G.
49.97MHz
49.97MHz
DC Volt
Meter (A)
Meter (A)
RXGND
RFRX
DC Volt
Meter (B)
Meter (B)
TXVCO
TXGND
Oscilloscope (H)
Noise Squelch
SIG_OUT
+
-
RF Volt
Meter (E)
Meter (E)
IFGND
IFOUT
DC12V
8
Ω
600
Ω
RING
TIP
AF Volt Meter
SP-OUT
+
-
DTMF
SIMULATOR
SIMULATOR
BELL
SIMULATOR
SIMULATOR
CALL ID
SIMULATOR
SIMULATOR
Oscilloscope
Loop
SIMULATOR
SIMULATOR
AF Volt Meter (F)
AF_OSC 1
AF_OSC
: Line Modulation Factor Signal Input
1
Rx Sense.
Note : (A) - (H) is refered to ADJUSTMENTS (BASE UNIT) (P.38)
KX-
TC124
5RUB
40
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