Panasonic KX-F910BX Service Manual page 105

(4) ADJUSTMENT PROCEDURE
ADJUSTMENT ITEM
DESCRIPTION
(A)
Rx VCO Voltage
Confirmation only
(B)
Tx VCO Voltage
Confirmation only
(C)
Standard Frequency
(D)
TX Output
(E)
Standard Modulation
(F)
20 dB Electric Detection
(G)
Maximum Modulation
Once aligned, please reassemble the base unit. Also take off the back of the PORTABLE HANDSET and unsolder the
MIC lead short wire if you previously installed it.
PROCEDURE
Place the voltmeter probe at RF unit TP3. Confirm that TP3 's voltage is within
0.5~2.5V(RF UNIT).
Place the voltmeter probe at TP2. Confirm that TP2 's voltage is within
0.5~2.5V(RF UNIT).
Adjust VC201 (RF UNIT) so that transmission frequency is set 904.0125 MHz ±0.5kHz.
Connect frequency counter between TPA and GND.
Connect the sythesized signal generator (814.0125 MHz, 1 kHz modulation frequency,
µ
3 kHz modulation, +60 dB
Adjust VR502 so that telephone line output (600 Ω Load) is -13.0
Connect a modulation meter and signal generator (814.0125 MHz, +60 dBµV,
unmodulation) in TPA and GND.
Connect the AF oscillator ( f=1 kHz, -30 dBm) to the telephone line output.
Adjust VR504 to set the modulation to +2.7
While reduced level of S.S.G.level when distortion of telephone line sending is 9 ± 1%.
Adjust VR501 in such a way that the letter "C" flashes on the machine's LCD display.
C L 1 B
Flashes
Connect a modulation meter and signal generator (814.0125 MHz, +60 dBµV,
unmodulation) in TPA and GND.
Connect the AF oscillator ( f=1 kHz, -30 dBm) to the telephone line output.
Adjust VR503 to set the modulation to +4.5
emf, output level) to the RF unit TPA and GND.
±
0.1 kHz.
4 0 0 1
±
0.2 kHz.
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KX-F910BX
±
1dBm.