- 2-15 -
VOLTAGE CHECK
ALL Fuse CHECK
IC901,IC902 INPUT DC VOLT CHECK
C904(+),C905(-)DC VOLT OUTPUT CHECK
D700 CHANGE
TransformerCHANGE
IC301 Troubleshooting CHECK
MUTE
YES
FUSE CHANGE
CN900 (-)1,2 PIN,(+)5,6 PIN OUTPUT VOLTAGE,D900 CHECK
YES
NO
YES
NO
NO
IC903 Output DC VOLT CHECK (6.2V)
D901,D902,D903,D904 COMPONENT CHECK AND CHANGE
Transformer CHANGE
YES
CN901 7 Pin DC VOLTOUTPUT CHECK
YES
NO
NO
IC903 Output DC VOLT CHECK (6.2V)
D908 +12V CHECK AND CHANGE
IC901 CHANGE
YES
D909,D910 VOLT CHECK
YES
YES
NO
NO
SECTION CHECK
YES
NO
IC904 CHANGE
Q500 CHECK AND CHANGE
YES
IC904 1PIN (+)High CHECK
NO
NO
Muting CIRCUIT Troubleshooting (MUTE CONDITION)
Q201,Q251,Q600,Q650 Base "High"
IC201Troubleshooting CHECK (ONLY Q201/Q251)
YES
NO
Q504 EMITTER "HIGH"(ONLY Q714/Q715)
NO
Q201,Q251,Q600,Q650 Collector "Low"
MUTE
TR CHANGE
YES
NO
Q504 CHANGE
YES
NO
Summary of Contents for LX-U250A
Page 7: ... 1 6 ...
Page 29: ... 2 22 INTERNAL BLOCK DIAGRAM of ICs NJW1190 BLOCK DIAGRAM ...
Page 30: ... 2 23 PIN FUNCTION SSOP44 ...
Page 31: ... 2 24 PIN FUNCTION QFP48 P1 ...
Page 35: ... 2 28 PIN DESCRIPTION ...
Page 36: ... BLOCK DIAGRAM 2 29 2 30 ...
Page 37: ...2 31 2 32 WMA USB BLOCK DIAGRAM ...
Page 38: ...2 33 2 34 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...
Page 39: ...2 35 2 36 FRONT SCHEMATIC DIAGRAM ...
Page 40: ...2 37 2 38 POWER SCHEMATIC DIAGRAM ...
Page 41: ...2 39 2 40 DECK SCHEMATIC DIAGRAM ...
Page 42: ...2 41 2 42 CD SCHEMATIC DIAGRAM ...
Page 43: ...2 43 2 44 USB SCHEMATIC DIAGRAM ...
Page 44: ...2 45 2 46 WIRING DIAGRAM ...
Page 45: ...2 47 2 48 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD ...
Page 46: ...2 49 2 50 FRONT P C BOARD ...
Page 47: ... CDP P C BOARD COMPONENT SIDE 2 51 2 52 ...
Page 48: ...2 53 2 54 CDP P C BOARD SOLDER SIDE ...
Page 49: ...2 55 2 56 LINEAR POWER ...
Page 53: ...3 5 3 6 ...
Page 54: ... 4 1 MODEL LXS U250 850 851 860 852 857 856 855 854 853 861 SECTION 4 SPEAKER SECTION ...
Page 55: ... 4 2 ...
