Service Notes

Note: These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose.

Leadless Chip Component (surface mount)

Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board to mount standard transistors or diodes. Some chips capacitor or resistor board solder pads may have holes through the board, however the hole diameter limits standard resistor replacement to 1/8 watt. Standard capacitor may also be limited for the same reason. It is recommended that identical components be used.

Chip resistor have a three digit numerical resistance code - 1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6kΩ resistor, 0 = 0Ω (jumper). Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the general range of the capacitance.

Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade of transistor.

Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode or common cathode. Check the parts list for correct diode number.

Component Removal

1.Use solder wick to remove solder from component end caps or terminal.

2.Without pulling up, carefully twist the component with tweezers to break the adhesive.

3.Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.

Chip Component Installation

1.Put a small amount of solder on the board soldering pads.

2.Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds.

TYPE

Chip Components

SOLDER

 

GRADE

 

CAPS

 

 

 

 

c

 

 

b

 

 

 

 

e

CAPACITOR

 

 

TRANSISTOR

 

1ST DIGIT

2ND DIGIT

 

COMMON

CATHODE

MULTIPLIER =1600 = 1.6k

ANODES

SOLDER

 

CAPS

MH DIODE

RESISTOR

 

How to Replace Flat-IC

- Required Tools -

Soldering iron

De-solder braids

Iron wire or small awl

Magnifier

1.Remove the solder from all of the pins of a Flat-IC by using a de-solder braid.

De-Solder

Braid

Flat-IC

2.Put the iron wire under the pins of the Flat-IC and pull it in the direction indicated while heating the pins using a soldering iron. A small awl can be used instead of the iron wire.

Iron

Wire

Awl

 

Soldering

Soldering

Pull

Iron

 

Iron

 

 

3.Remove the solder from all the pads of the Flat-IC by using a de-solder braid.

Soldering

Iron

De-Solder

Braid

Flat IC

4.Position the new Flat-IC in place (apply the pins of the Flat-IC to the soldering pads where the pins need to be soldered). Properly determine the positions of the soldering pads and pins by correctly aligning the polarity symbol.

Polarity Symbol

5.Solder all pins to the soldering pads using a fine tipped soldering iron.

Solder

Soldering

Iron

 

6.Check with a magnifier for solder bridge between the pins or for dry joint between pins and soldering pads. To remove a solder bridge, use a de-solder braid as shown in the figure below.

 

De-Solder

 

Braid

Solder

Soldering

Bridge

Iron

 

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Panasonic CT-32SX31CE Service Notes, Leadless Chip Component surface mount, Component Removal, Chip Component Installation

CT-32SX31E, CT-36SX31E, CT-32SX31CE, CT-32SX31UE, CT-36SX31CE specifications

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