Panasonic KX-FPC135, Service Manual

Page: 127 / 264

3.6. Objective
This procedure will enable the technician to make adjustments
to the KX-FPC135/KX-FPC141 HANDSET and BASE UNIT.
3.7. General Information
This procedure has 2 sections. The first section instructs the
technician on how to align the HANDSET. We recommend
aligning the HANDSET first, since you will need the HANDSET
to align the BASE UNIT. The second section aligns the BASE
UNIT. You can use either section separately, or together to
align the entire cordless phone unit.
At the beginning of each section, you will find a preparation
procedure instructing you on how to prepare the unit to the
point of placing the unit in TEST mode. Please follow this
procedure to insure proper alignment.
Each section´s procedure consists of Adjustment Items
adjusting one specific variable hardware component.
Each Item lists the equipment needed, how to connect and
setup the equipment, how to make the adjustment, and how to
verify the adjustment if necessary.
Before the actual procedure, you will find a procedure detailing
how to place that part in TEST mode. You will have to perform
this procedure before each individual Adjustment Item.
Once aligned, please remove all equipment connections and
solder points, and reassemble the unit. As a final check, power
up the phone and check for HANDSET linking with the BASE
UNIT.
3.8. Equipment
1. Radio Tester : Marconi Model 2295A or later.
2. 4.5 digit Digital Multimeter : B&K Model 2833 or compatible.
3. Oscilloscope, single or dual channel : Panasonic VP-
5512P100 or compatible.
4. Telephone Analyzer : B&K Model 1050 or compatible.
5. DC Power Supply, capable of supply 3.9V DC at 100mA
NOTE : only needed if Telephone Analyzer does not have
DC VOLTS output available.
6. Corded Telephone.
7. High Frequency Cable : BNC end to open end.
8. Audio Cable : BNC end to alligator clip end.
9. High Frequency Adjustment Tool:
10. Isolation Capacitors, quantity of 2, 10 µF maximum, 50V
DC or greater.
11. Soldering Iron, solder, and various tools.
3.9. Handset Preparation
Please perform the following steps to prepare the HANDSET
for alignment. Please refer to the HANDSET REFERENCE
DRAWING for connection and test point locations.
1. Remove battery cover and battery.
2. Remove both screws at the case bottom.
3. Grabbing hold of the back near the bottom, gently pry off
the back of the case.
4. Remove the antenna mounting screw. Pull out the antenna.
5. Unsolder both speaker connections on P.C.Board.
6. Remove the HANDSET P.C.Board.
7. Remove the keypad membrane.
8. Solder High Frequency Cable open end to ANT and RF
GND points.
9. Using the Digital Multimeter, measure DC VOLTS output on
the Telephone Analyzer. Adjust the output voltage to 3.9V
DC.
10. Solder battery connection wires at the points shown in the
HANDSET REFERENCE DRAWING. Solder the positive
lead to TP-V
DD
, towards the component side of the
P.C.Board. Solder the negative lead to the TP-V
SS
. DO
NOT APPLY POWER TO THE HANDSET AT THIS
TIME!!!!!!
11. Solder a small, insulated piece of wire to GND as well.
12. Solder 1 isolation capacitor´s positive lead to SP+ test
point. When soldering, keep the lead close to the
P.C.Board as possible since you will lay the keypad
membrane over part of this lead.
13. Solder a small, short, insulated wire to MIC test point.
14. Lay the keypad membrane over the keypad switch
contacts.
3.10. Symptom/Remedy Table
If you have one of the listed symptoms, please refer to this
table and make the appropriate adjustments.
3.11. Handset 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. Apply power to the HANDSET, and press TALK key.
4. Press 5, 8 and 0 keys at the same time.
5. You should hear the HANDSET beep. Release the 3 keys.
If you do not hear a beep, remove the power from the
HANDSET and repeat the last 2 steps.
6. Press the TALK key. HANDSET should now be in TEST
MODE (CH 1 TALK). The TALK should be on. If the
HANDSET is not in TEST MODE, remove the power and
repeat the last 3 steps.
7. Remove the keypad membrane and lay it aside to prevent
pressing some button by mistake during alignment.
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KX-FPC135 / KX-FPC141