Standard Notes For Servicing - Emerson Symphonic SC1304 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
CBA
* Be careful to avoid a short circuit.
[ CBA= Circuit Board Assembly ]
Bottom View
Input
5
10
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.
Pb (Lead) Free Solder
Pb free mark will be found on PCBs used Pb free
solder. (Refer to figure.) For PCBs with Pb free
mark, be sure to use Pb free solder. For PCBs
without Pb free mark, use standard solder.
Replacement Procedures for
Leadless (Chip) Components
The Following Procedures are Recom-
mended for the Replacement of the Lead-
less 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.
1-3-1
473
(Top View)
(Top View)
Pb free mark
SFTY_Z13N