B Board - Sony FDL-PT22/JE Service Manual

B BOARD IC VOLTAGE LIST
Pin Volt Pin Volt Pin Volt
IC301 1 3.0 24 4.2 23 3.4
2 3.1 IC401 1 1.3 24 -
3 0.6 2 0 25 3.8
4 - 3 0.8 26 3.3
5 3.5 4 0.8 27 0.9
6 2.5 5 2.7 28 0.9
7 - 6 2.7 29 0.9
8 - 7 2.8 30 0.8
9 2.8 8 2.8 31 0.3
10 3.0 9 3.3 32 3.8
11 2.9 10 1.9 33 GND
12 3.1 11 3.9 34 1.8
13 GND 12 3.9 35 1.1
14 0.3 13 0 36 0
15 - 14 3.9 37 0.3
16 - 15 1.7 38 3.6
17 1.5 16 1.7 39 GND
18 3.7 17 1.7 40 0
19 1.6 18 1.7 41 2.1
20 2.0 19 1.7 42 0
21 3.4 20 2.0 43 3.5
22 - 21 2.0 44 GND
23 2.0 22 GND
All voltage are in V.
- : Not used
B BOARD TRANSISTOR
VOLTAGE LIST
B C E
Q302 0.3 3.5 GND
Q303 3.6 1.8 4.1
Q402 3.9 4.4 3.2
Q403 2.1 0 GND
Q408 0 3.8 GND
1 2 3 4 5 6
Q406 GND -0.7 6.5 12.4 13.3 6.5
Q407 1.8 0 6.5 1.8 1.8 13.3
All voltage are in V.
- : Not used
• B BOARD WAVEFORMS
1 2 3
2.0Vp-p (4.5MHz) 1.1Vp-p (4.43MHz) 1.0Vp-p (H)
5 6 7
4.1Vp-p (H) 1.4Vp-p (H) 1.4Vp-p (H)
– 27 –

B BOARD

DIODE
*
3
D301 B-2
3
D302 B-2
3
D303 F-2
3
D401 C-3
3
D403 F-4
3
D404 F-4
3
D405 B-3
IC
IC301 C-3
IC401 C-4
TRANSISTOR
*
Q302 C-3 2
2
Q303 B-2
2
Q402 B-3
2
Q403 C-3
@º
Q406 C-5
@º
Q407 B-5
2
Q408 C-3
VARIABLE
RESISTOR
RV301 B-2
RV402 C-4
4
0.7Vp-p (H)
8
1.4Vp-p (H)
B
CHROMA,
LCD INTERFACE
– B BOARD –
1 2 3
A
B
C
D
E
F
G
H
I
4 5 6
< Component Side >
< Conductor Side >
NOTE:
: Pattern from the side which enables seeing.
: Pattern of the rear side.
– 28 –
7