2-4
2. SOUND ERROR CORRECTION FLOW CHART
No sounds of All Functions?
Something wrong with the Sound?
OK
YES
IC601(24)
YES
NO
Checked the
E-VR VDD?
IC601(27)
YES
NO
Checked the
E-VR GND?
IC601(25, 26), IC401(31, 32)
YES
NO
Checked the
E-VR control?
IC601(15), IC401(98)
YES
NO
Checked the E-VR
Mute control?
IC601(1, 2, 3, 4, 5, 6, 7, 9,
18, 19, 20, 21, 22, 23)
YES
YES
NO
Checked the E-VR
Signal in/out?
IC804(1, 2, 8, 13, 18, 24)
YES
NO
Checked the
Power IC GND?
IC804(6, 20)
NO
Checked the
Power IC VDD?
IC804(4, 22), IC401(85, 87)
YES
NO
Checked the
Power IC control?
IC804(3, 5, 7, 9, 11, 12, 14,
15, 17, 19, 21, 23)
YES
NO
Checked the Power
IC Signal in/out?
JK801(11, 12, 13, 14, 15, 16, 17, 18)
YES
NO
Checked the
Main connector?
2A
2B
2C
Summary of Contents for MAX220UB
Page 27: ...2 18 ...
Page 35: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD 2 33 2 34 TOP VIEW BOTTOM VIEW ...
Page 36: ...2 FRONT P C BOARD 2 35 2 36 TOP VIEW BOTTOM VIEW ...
Page 37: ...2 37 2 38 ...
Page 39: ...3 3 3 4 ...