Blaupunkt MVP 01 - Page 7

CAUTION :
1. Do not supply the hot air to the chip parts around the
Fiat Pack IC for tong time as damage may occur to the
chip parts around the Flat Pack iC.
Hot Air Flat Pack IC
C.B.A.
a
Desoldering
og
Equipment
Masking Sa
Tape q
Tweezers——"
Flat Pack IC
Fig. 13
Put Masking Tape around the Flat Pack !C to protect
adjacent parts.
2. The Flat Pack IC on the P.C.B. is affixed with glue, so
be careful so as not to break or damage any foil under
the iC or at each pin when removing it.
(with Soldering tron)
(1) Use desoldering braid to remove the soider from all pins
of the Flat Pack IC.
Use solder flux applied to all pins of the Flat Pack IC to
allow easy removal.
Desidering
FlatPackic Braid
Soldering Iron
Fig. 14
(2) Lift each lead of the Flat Pack IC upward one by one
using a sharp pin or non solder wire (iron wire), while
heating the pins using a fine tip soldering iron or a hot
air blower.
Soldering tron
Fig. 15
{with tron Wire)
(1) Use desoidering braid to remove the solider trom ait pins
of the Flat Pack IC.
Use solder flux applied to al! pins of the Flat Pack IC to
allow easy removal.
{2) Affix the wire to workbench or solid mounting point as
shown in Fig. 16.
{3) Pull up wire as the solder melts so as to lift the IC lead
from the P.C.B. contact pad, while heating the pins using
a fine tip soldering iron or hot air blower.
Hot Air Blower
Solid Mounting
Point Se
tron Wire
~—— Of Soldering Iron
Pull up gently
to remove
Fig. 16
Note:
When using a soldering iron care must be taken to
ensure that the Flat Pack IC is not being held by giue or
the P.C.B. may be damaged if force is used.
If glue is holding the IC, then heat the IC with hot air to
loosen the glue.
2. How to install the Flat Pack IC
(1) Use desoldering braid to remove the solder from the foil
of each pin of the Flat Pack IC on the P.C.B. so you can
install a replacement Fiat Pack IC more easily.
(2) The ” @ " mark on the Flat Pack IC indicates pin 1. (See
Fig. 17)
Make sure this mark matches the 1 on the P.C.8. when
positioning for installation.
Then pre-soider the four corners of the Fiat Pack IC
(See Fig. 18)
“Example”
Pin 1 of the Flat Pack IC is indicated
bya "@" mark.
Fig. 17
Soldering tron
Presoider
Fiat Pack IC
Fig. 18
(3) Solder all pins of the Flat Pack IC.
Make sure that none of the pins have solder bridges
between Pins on the Flat Pack IC.
S. Special Note
All integrated circuits and many other semiconductor de-
vices are electrostatically sensitive and therefore require
special handling techniques described under the “ELEC-
TROSTATICALLY SENSITIVE (ES) DEVICES” section of
this service manual.
T. Voltage Measurement
1. Voltage Chart
a. Color bar signal in SP mode.
b. ----:Unmeasurable or unnecessary to
measure,
2. Schematic Diagram
a. Audio Section
monoscope signal in PB mode.
b. Other Sections
color bar signal in PB mode.
Note:
Voltage Indications for PB mode
on Schematic are as shown below.
2.5
PB mode
-13-
U. How to Read Waveform
=, © Connecting Font
“~@ D vons/Niv
@ Volis/Ow
@ Connecting Paint
© Tine/Div
@ Trigger Channel of ine
scope
(1: UPPER, 2: LOWER,
@ Operation Moge of VCR
@ Wavetorm Paint on
Schematic
m—® @ AV}: Peak to Peak.
V. Indication for Zener Voltage of Zener Diodes
The Zener Voltage of Zener Diodes are indicated as such
on schematic Diagrams.
Example: (6.2V)...Zener Voltage
W. “©” Marks on C.B.A. layout indicate
“©” indicates the connection gaint between the Foil Side
and the Component Side the C.B.A.
X. How to identify Connectors on Schematic
Diagram
Each connector is labeled with a connector No. and Pin Nc.
indicating what it is connected to, in other words, its counter
part.
Connections between large P.C.B.’s and small circuit
Boards are illustrated on the large P.C.B. schematics,
Use the interconnaction schematic diagram to find the
connections between associated connectors.
Example:
The connections between C.B.A.s are as shown below.
MAIN C.B.A.
(TO HEAD AMP ASS'Y)
(P3001-1 P3501 11]
| P3001-2§P3s01-1 | C.B.A. to which
[ P3007 - 3] 1Pa501-9 | this connector is
P3001-4 1P3501-4 | connected.
| F |
Connector No. Connector No. and Pin No. to
and Pin No. on which connector on the left is
Main C.B.A. connected.