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6.6 RS-232C
Problem
6.9
Cartridge Problem
•
Run
the
following program and check
•
Check CTS* signal
pin
3
of IC4
and
pin
12 of
IC8
•
Check Address/Data
Bus (short
or
(Refer
to
Waveform
15)
open)
•
Check
pin
8
of CN1
(CART* input)
10
POKE 65312,2
and pin
7
of CN1 (QCLK Output)
20
POKE 65312,0
30
GOTO
10
•
Connect pin
4 and pin
2
of JK3 and
run
the
above program. Check pin
14
of IC8
and check pin
4
of IC8
•
Check Resistors
R15, R16, R17 and
R66 and Diodes D6 and D7
6.7 Sound
Problem
•
Check TV volume
•
Run
the
following program and check
pin
1
of IC7
(Waveform
13)
•
Check Bias Voltage of
Q4,
C55 and
C56
•
Check TP11
•
Check JK5 and pin
7
of CN3
10
SOUND 200,255
20
GOTO
10
6.8 Joystick Problem
•
Run
the
following program and check
if
the
numbers vary with joystick
position
or
depressing
fire button.
•
Check
D8
-
Dll and
Components
around them (example:
C18, CI
9,
C22, C23)
5
CLS
10
A=JOYSTK(0)
20
B=J0YSTK(1)
30
C=J0YSTK(2)
40
D=J0YSTK(3)
50
E=(PEEK(65280) AND
l)
60
F=(PEEK(65280) AND 2)/2
70
PRINT @0,A,B,C,D,F,E
80
GOTO
10
-57-
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