Panasonic KX-F900 Service Manual page 108

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(2) SYMPTOM/REMEDY TABLE
If you have one of the listed symptoms, please refer to this table and make the appropriate adjustments.
SYMPTOM REMEDY
Does not link with CORDLESSBASE UNIT Check Items (A) and (B).
If both items are OK, adjust Items (D) and (E).
Speaker level is unstable Check Items (A) and (B).
If both items are OK, adjust Items (C).
Tx sound is unstable Check Items (A) and (B).
If both items are OK, adjust Items (F).
(3) ADJUSTMENT PREPARATION
Please perform the following procedure before starting the Adjustment Procedure. You only have to perform this procedure
only once to complete all Items, but you will have to perform this procedure to make an individual Adjustment Item.
1. You will need all equipment listed in the Item's EQUIPMENT section.
2. Setup all equipment as specified in the Item's PROCEDURE section SETUP portion.
3. On the PORTABLE HANDSET under test, press and hold down the 1,9, and -_ keys.
4. Apply power to the PORTABLE HANDSET.
5. Release the 3 keys. You should hear the PORTABLE HANDSET beep. If you do not hear a beep, remove the power
from the PORTABLE HANDSET and repeat the last 2 steps.
6. Press the INTERCOM key, then press the TALK key. PORTABLE HANDSET should now be in TEST MODE
(CH 1 TALK). The IN USE/BATT LOW LED should be on. If the PORTABLE HANDSET is not in TEST MODE,
remove the power and repeat the last 3 steps.
7. Remove the keypad membrane and lay it a side.
(4) ADJUSTMENT PROCEDURE
ADJUSTMENT ITEM
DESCRIPTION
(A)
Rx VCO Voltage
Confirmation only
(B)
Tx VCO Voltage
Confirmation only
(c)
SP Output
EQUIPMENT
Digital Multimeter
SETUP to measure DC Voltage, 20V
range
Digital Multimeter
SETUP to measure DC Voltage, 20V
range
Marconi
SETUP Put in Receiver Test Mode.
RF GEN
FREQ 902.1000MHz
LEVEL 60dBpV
SET MOD
FREQ 1.000kHz
LEVEL 5.000kHz
High Frequency Cable to left RF
Connector. Audio Cable positive lead to
isolation capacitor, negative lead to GND
BNC end to AF INPUT connector.
PROCEDURE
Connect negative lead to RF module metal cover
and positive lead to TP5. Measure voltage and
confirm that this voltage is between 0.8V DC and
1.8V DC. DO NOT PROCEED IF NOT IN RANGE!!
Connect negative lead to RF module metal cover
and positive lead to TP6. Measure voltage and
confirm that this voltage is between 0.8V DC and
1.8V DC. DO NOT PROCEED IF NOT IN RANGEfl
Adjust VR202 until AF VOLTS equals
-33dBV +l-ldBV
Note
This voltage reading is with no speaker or load
attached to the PORTABLE HANDSET P.C.Board.
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