Yorkville Sound YS1044 service manual Production Notes

		M1237-01.PCB_DATABASE_HISTORY
MODEL(S):-		K2
#	DATE	VER#	DESCRIPTION OF CHANGE
1	FEB-27-2006	V1.00	FIRST RELEASE:PC#7086 R52 #4840 33K->#4838 100K	-->
2	APR-07-2006	V1.01	PC#7089:AH:R44 4829 10K --> 4639 4K99, R48 10K 4829
3	.	.	4K99 4639, R130 20K 4885 --> 4838 100K,CHANGE HPF FRQ
4	D	V	N
5	D	V	N
6	D	V	N
7	D	V	N
8	D	V	N
9	D	V	N
10	D	V	N
11	D	V	N
12	D	V	N
13	D	V	N
1	D	V	N
2	D	V	N
3	D	V	N
4	D	V	N
5	D	V	N
6	D	V	N
7	D	V	N
8	D	V	N
9	D	V	N
10	D	V	N
11	D	V	N
12	D	V	N
13	D	V	N

SEE LAYOUT DIAGRAM

			M1237-01 DRILL HISTORY
MODEL(S):-		K2
#	DATE	VER#	DESCRIPTION OF CHANGE
1	D	V	N
2	D	V	N
3	D	V	N
4	D	V	N
5	D	V	N
6	D	V	N
			M1237-01 PENDING CHANGES
MODEL(S):-		K2
#	PC#	PENDING CHANGE
1	PC	X
2	PC	X
3	PC	X
4	PC	X
5	PC	X
6	PC	X

*PLACE IMPLEMENTED CHANGES INTO BOARD HISTORY

			POT LIST
MODEL(S):-		K2
REF	FUNCTION		PART#	KNOB	{NEW}
P1	CH-1 GAIN		4452	8399	N
P3	CH-2 GAIN		4452	8399	N
P5	BASS		4453	8399	N
P6	MID		4453	8399	N
P7	TREBLE		4453	8399	N
P10	BASS		4453	8399	N
P9	MID		4453	8399	N
P8	TREBLE		4453	8399	N
P4	MASTER		4452	8399	N
P2	MONITOR GAIN		4454	9922	N
S3	VOICING SW		3393	8400	N
R	F		P	K	N

PRODUCTION NOTES

1- ADD THERMAL JOINT COMPOUND (GOOP) BETWEEN Q9 AND Q13;

Q10 AND Q11 COVER WITH VINYL CAP (8609) AND RTV.

2- ADD RTV TO ALL CAPACITORS.

LEAD/PIN REFERENCE
BD139	2N5401 2N5638			H
BD238	2N5551		H	5	1P		1		+V
BD140			4		6
	MPSA06	2K				1G			A
BD237			3		7		2
MJE271	MPSA43						3		B
MJE270	MPSA56	2G	2		8	1K	4	-V
MJE340	MPSA63								NE5532N
MJE350			1		9
	D S G		2P		HT
	TO-92		12AX7A
	BC550C
	BC560C
	E B C
	TO-92
E C B
TO-126	C B E
	TO-92

81

72

63

54

+V

A

B

-VMC33078P

8	1		1		4
7	2
6	3
5	4		+V		-V
	5
	6
		2		3
	7		MC33079P

14

13

12

11

10

9

8