Standard Notes For Servicing - Sylvania Emerson 6719DC Service Manual

STANDARD NOTES FOR SERVICING

Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is indi-
cated as shown:
Top View
Out
In
2. For other ICs, pin 1 and every 5th pin is indicated
as shown:
Pin 1
3. The 1st pin of every pin connector are indicated as
shown:
Pin 1
Instructions for Connectors
1. When you connect or disconnect FFC cable (con-
nector), be sure to disconnect the AC cord.
2. FFC cable (connector) should be inserted parallel
into the connector, not at an angle.
FFC Cable
Connector
* Be careful to avoid a short circuit.
[ CBA= Circuit Board Assembly ]
Bottom View
Input
5
10
CBA
How to Read the Values of the Rect-
angular Type Chip Components
Example:
(a) Resistor
= 473 = 47 [kΩ]
(b) Capacitor
= Not Shown
Caution:
Once chip parts (Resistors, Capacitors, Transistors,
etc.) are removed, they must not be reused. Always
use a new part.
Replacement Procedures for
Leadless (Chip) Components
The Following Procedures are Recom-
mended for the Replacement of the
Leadless Components Used in this Unit.
1. Preparation for replacement
a. Soldering Iron
Use a pencil-type soldering iron (less than 30
watts).
b. Solder
Eutectic solder (Tin 63%, Lead 37%) is recom-
mended.
c. Soldering time
Do not apply heat for more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before
installation. (130°C~150°C, for about two minutes.)
Notes:
a. Leadless components must not be reused after
removal.
b. Excessive mechanical stress and rubbing for the
component electrode must be avoided.
2. Removing the leadless component
Grasp the leadless component body with tweezers
and alternately apply heat to both electrodes. When
the solder on both electrodes has melted, remove
leadless component with a twisting motion.
1-4-1
473
(Top View)
(Top View)
SFTY_5