Read Sharp DX-AT50H (serv.man21) Service Manual online
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DX-AT50H
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indicated as
shown.
Top View
Out
In
Bottom View
Input
b. For other ICs, pin 1 and every fifth pin are indicated as
shown.
5
10
Pin 1
c. The 1st pin of every male connector is indicated as
shown.
Pin 1
Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible Foil
Connector) cable, be sure to first disconnect the AC cord.
2. FFC (Flexible Foil Connector) cable should be inserted
parallel into the connector, not at an angle.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
(1) Prepare the hot-air flat pack-IC desoldering machine, then
(1) Prepare the hot-air flat pack-IC desoldering machine, then
apply hot air to the Flat Pack-IC (about 5 to 6 seconds).
(Fig. S-1-1)
(Fig. S-1-1)
Fig. S-1-1
(2) Remove the flat pack-IC with tweezers while applying the
hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the CBA;
when removing entire flat pack-IC, first apply soldering iron
to center of the flat pack-IC and heat up. Then remove (glue
will be melted). (Fig. S-1-6)
to center of the flat pack-IC and heat up. Then remove (glue
will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using tweezers. (Fig.
S-1-6)
Caution:
1. Do not supply hot air to the chip parts around the flat pack-
1. Do not supply hot air to the chip parts around the flat pack-
IC for over 6 seconds because damage to the chip parts
may occur. Put masking tape around the flat pack-IC to
protect other parts from damage. (Fig. S-1-2)
may occur. Put masking tape around the flat pack-IC to
protect other parts from damage. (Fig. S-1-2)
2. The flat pack-IC on the CBA is affixed with glue, so be careful
not to break or damage the foil of each pin or the solder lands
under the IC when removing it.
under the IC when removing it.
Hot-air
Flat Pack-IC
Desoldering
Machine
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Tape
Fig. S-1-2
STANDARD NOTES FOR SERVICING
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