Mitsubishi V19-V21, Техническое руководство

Страница: 30 / 71

5-8
Locating the source of these supplies can be time con-
suming.
Table 5-3 indicates the PCB where each sup-
ply is located, and the path from that supply to its' source.
Supplies located on the PCB-SIGNAL can be on one
of three shematics in the Service Manual.
• PCB-SIGNAL (Micro)
Voltage supply derivation paths:
Supply Path
Source
3.3V
1
T9A20 -> 6VS -> IC9C50 -> 3.3V
Linear surface mount regulator on
PCB-3DYC
3.3V
2
T9A20 -> 6VS -> IC8E01 -> 3.3V
Linear surface mount regulator on
PCB-CONV GEN
3.3V
3
T9A20 -> 6VS -> IC9A22 -> 5V -> IC9C20 -> 3.3V
Linear regulator (heat sink required)
on PCB-SIG [Video Chroma]
3.3VS
1
T9A20 -> 12VS -> IC9B00 -> 3.3VS Buck regulator on DM Power board
5V
1
T9A20 -> 6VS -> IC9A22 -> 5V
Main 5V from PCB-PWR to PCB-SIG
[Video Chroma]
5V
2
T9A20 -> 12VS -> Q9A20 -> 12V -> IC8E02 -> 5V Linear regulator on PCB-CONV GEN
5V
3
T9A20 -> 6VS -> IC9C40 -> 5V
Linear regulator on PCB-SIG [Video
Chroma]
5VS
1
T9A20 -> 12VS ->IC9C00->5VS
Micro 5V Hold-up supply on PCB-SIG
[Micro]
5VS
2
T9A20 -> 12VS -> IC9B00 -> 5VS Buck regulator on DM Power board
-9V T9A50 -> -24V -> D8D04(zener) -> -9V
Zener diode on Power board to PCB-
CONV GEN
9V
1
T9A50 -> 24V -> D8D03(zener) -> 9V
Zener diode on Power board to PCB-
CONV GEN
9V
2
T9A20 -> 12VS -> Q9A20 -> 12V -> IC9C01 -> 9V
Linear regulator (9V-1) on PCB-SIG
[AV I/O]
9V
3
T9A20 -> 12VS -> Q9A20 -> 12V -> IC9C02 -> 9V
Linear regulator (9V-2) on PCB-SIG
[Video Chroma]
9VS
1
T9A20 -> 12VS -> IC4A02 -> 9VS Linear regulator on PCB-JUNGLE
9VS
2
T9A20 -> 12VS -> IC9C03 -> 9VS
Linear SMT regulator (9VS) on PCB-
SIG [[AV I/O]
12V
1
T9A20 -> 12VS -> Q9A20 -> 12V Transistor on PCB-POWER
12V
2
T9A50 -> 24V -> Q5A08 -> 12V Transistor on PCB-MAIN
12VS T9A20 -> 12VS T9A20 transformer on PCB-POWER
17V T9A50 -> 17V T9A50 transformer on PCB-POWER
-24V T9A50 -> -24V T9A50 transformer on PCB-POWER
24V T9A50 -> 24V T9A50 transformer on PCB-POWER
28VS T9A20 -> 12VS tripler ckt -> 32VS -> D9A35 -> 28VS
Tripler circuit and D9A35 on PCB-
POWER
32VS T9A20 -> 12VS tripler ckt -> 32VS Tripler circuit on PCB-POWER
110V T9A50 -> 110V T9A20 transformer on PCB-POWER
220V T9A50 -> 220V T9A20 transformer on PCB-POWER
6.3VAC T9A50 -> 110V -> T8A31 -> heater 6.3V(rms) T8A31 on PCB-MAIN
Table 5-3: Voltage Supply Source Paths
• PCB-SIGNAL (AV I/O)
• PCB-SIGNAL (Video/Chroma)
In Table 5-3 the specific PCB-SIGNAL schematic is
indicated in brackets [ ].