Panasonic NE-1252, Service Manual

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18
Removal of Positive Lock connector
The positive lock connector is a specially designed loose
free connector and you will find this connector in many lead
wire connections. To remove this connector, pull the lead
wire by pressing an extruded lever in the center of recepta-
cle terminal as shown.
9.2. Replacement of power relay
circuit board (PCB MU)
NOTE: Be sure to ground any static electric charge built up
on your body, before handling the power relay P. C. B..
1. Disconnect all lead wires from power relay circuit board.
2. Remove the power relay P. C. B. together with its mount-
ing bracket by first removing the 1 bracket holding screw.
3. The power supply P. C. B. can be separated from mount-
ing bracket by removing the 2 screws.
9.3. Replacement of digital pro-
grammer circuit board (PCB
AU)
1. Disconnect 2 flat cables from PCB A(U).
2. Disconnect all of the connector from PCB A(U).
3. Remove 2 screws holding PCB A(U) to detach it from its
mounting bracket.
NOTE1: Please use care in handling the D. P. C. board to
avoid damage.
NOTE2: After replacing the PCB AU with new one, set the
power voltage (208V or 230V) up as below procedure.
1. Open the door and leave it open.
2. While pressing START pad, close the door and open it
again.
3. Press SHIFT [A/B/C] key within 10 second after openning
the door.
4. Press X2 or X3 key to set the voltage up.
• When X2 key is selected, [208] will appear, and [230]
appears when X3 key is pressed.
5. Press PROG pad to set the voltage up.
• After 3 seconds, the power voltage selected will disap-
pear and 0 appears in the display window.
• It has been just completed.
9.4. Replacement of PCB BU (for
display tube) and membrane
switch
1. Remove the grounding screw for membrane switch.
2. Disconnect 2 flat cables of membrane switch and PCB
B(U) from PCB A(U).
3. Remove 3 screws holding control panel and detach it
from the unit.
4. Remove 2 screws to detach PCB B(U) from the control
panel.
5. Detach escutcheon A from escutcheon base by releasing
hooks, and also remove membrane switch from it.