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System Testing; Disassembly Procedure - Mattel IntelliVision II 5872 Service Manual

Microprocessor (cpu) - general instrument cp-1610 16-bit processor.

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SYSTEM TESTING
DIAGNOSTIC TEST ROUTINE. The diagnos-
tic test routine should be performed before
disassembly of the Master Component. Full
instructions covering the operation and analy-
sis of results are included with the Diagnostic
Test
Cartridge.
CUSTOMER'S GAME CARTRIDGE TEST.
Test the customer's Game Cartridge as
follows:
a. Verify that Master Component is con-
nected to television set as outlined
in the Operating Instructions.
b.
Set the Antenna Switch Box to GAME
.
Insert customer's Game Cartridge in
Master Component and depress the
reset
switch.
Check for mistakes in
lettering on title picture, jumbled play-
field or unwanted characters
.
c. If any problems occur. remove cus-
tomers Game Cartridge and check
Master Component with a known-good
Game Cartridge.
d. With the known-good Game Cartridge
inserted. if problems are not observed,
then the customer's Game Cartridge
is
defective.
If
problems
are
still
observed.
troubleshoot
the
Master
Component.
DISASSEMBLY PROCEDURE
Before disassembly of the Master Component.
follow the steps in the Testing Procedure
section to determine the most likely cause of
the
malfunction.
Additionally, check the wall-
mounted AC adaptor prior to disassembly for
the possibility of its
malfunctioning.
Refer
to the Troubleshooting Procedure section for
instructions on testing the wall-mounted
~C
adaptor. Disassemble the Master Component
only to the extent necessary to accomplish
repairs
.
WARNING
MAKE SURE THE MASTER COMPONENT
IS UNPLUGGED FROM THE AC ADAPTOR
BEFORE
DISASSEMBLY.
REMOVE
ANY
GAME CARTRIDGE FROM THE UNIT, DIS-
CONNECT THE RF CABLE FROM THE RF
OUTPUT JACK AND THE HAND CONTROL-
LERS FROM THEIR SOCKETS.
DISASSEMBLY OF CONSOLE ASSEMBLY.
Disassemble the Master Component in a clean,
well-illuminated
area.
Refer
to
Exploded
Diagram (Figure 5, Page 22).
Turn console assembly upside down on a
surface protected by a soft cloth or a piece
of carpet.
-9-
a. Remove
two
Phillips-head
screws
securing the top housing assembly to
the bottom housing
assembly.
b. Turn console assembly right side up.
Gently pull the front of the top housing
assembly up and away from the bottom
housing assembly
.
Small catches in the
rear of the console assembly prevent
the top and bottom housing assemblies
from being pulled directly apart.
c.
Remove the 3 Phillips-head screws
holding the Power Supply Board to the
standoffs on the Logic Board
.
d. Gently lift the Power Supply Board
straight up from the Logic Board.
e. Remove 4 Phillips-head screws holding
the Logic Board to the lower housing
assembly.
f.
Grasp the LogiC Board at the 44-pin
game connector and gently pull it
straight up and away from the lower
housing assembly. Be sure to allow
the Channel Select switch to clear its
opening in the lower housing assembly.
,

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