Sony FDL-PT22/JE service manual CHROMA,LCD Interface

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)

B BOARD

DIODE		*
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	3
IC
IC301	C-3
IC401	C-4
TRANSISTOR *
Q302	C-3	2
Q303	B-2	2
Q402	B-3	2
Q403	C-3	2
Q406	C-5	@¼
Q407	B-5	@¼
Q408	C-3	2
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	4		5	6	7
A				< Component Side >

B

C

D

< Conductor Side >

E

F

G

H

	NOTE:
I	∙	: Pattern from the side which enables seeing.
	∙	: Pattern of the rear side.

– 27 – – 28 –