Sony BVM-L230 Service Manual page 4

2-2-5. Overvoltage and Overcurrent Protection
Circuits .................................................................. 2-6
2-2-6. BL_12V ................................................................. 2-6
2-3. LMD2 Board ................................................................... 2-7
2-3-1. Power Circuit ......................................................... 2-7
2-3-2. LED Driver Circuit ................................................ 2-9
2-3-3. H8 Microcomputer Operating Environment ....... 2-11
2-3-4. External Interface ................................................ 2-11
2-3-5. Reset Circuit ........................................................ 2-11
2-4. S1, S2, and S3 Boards ................................................... 2-12
2-4-1. Outline ................................................................. 2-12
2-4-2. Circuit Operation ................................................. 2-14
2-4-3. Others .................................................................. 2-15
A. Semiconductor Pin Assignments
B. Spare Parts
B-1. Notes on Repair Parts .................................................... B-1
B-2. Exploded Views ............................................................. B-2
B-3. Electrical Parts List ...................................................... B-11
B-4. Packing Materials & Supplied Accessories ................. B-89
C. Block Diagrams
Overall ........................................................................... C-1
D. Schematic Diagrams
B (SUFFIX: -12) ............................................................ D-2
B (SUFFIX: -13) .......................................................... D-46
G .................................................................................. D-89
LMD1 .......................................................................... D-91
LMD2 .......................................................................... D-93
ST1 ............................................................................... D-98
T ................................................................................... D-99
YA .............................................................................. D-101
YB .............................................................................. D-101
YC .............................................................................. D-101
Frame Wiring ............................................................. D-102
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E. Board Layouts
B (SUFFIX: -12) ............................................................ E-2
B (SUFFIX: -13) ............................................................ E-6
G .................................................................................. E-10
LMD1 .......................................................................... E-12
ST1 ............................................................................... E-13
YA ................................................................................ E-13
YB ................................................................................ E-13
YC ................................................................................ E-13
LMD2 .......................................................................... E-14
T ................................................................................... E-16
BVM-L230