Jvc 4VN 990 Service Manual
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Extracted text from Jvc 4VN 990 Service Manual (Ocr-read)
Page 2
PACKING ILLUSTRATION
E38608-121-©
CORNER PAD
E38608-121- 6)
TOP PAD
d
. E38608-121-@
, / CENTER PAD
E38608-121-@
INSIDE CASE
E38608-121-©
BOTTOM PAD
Fig. 1
Parts No. Parts Name Dwg. No. 1
L 4VN-990-PK Carton Case 4
4VN-990-NZ Packing Material 1,2,3,6
E32332-016 Envelope (for Set) -
EXPLODED VIEW OF MECHANICAL PARTS
Dwg. No. Parts No. Parts Name
1 E21 149-001 Cover
2 Q03093-108 Washer
3 SDSP4008NS Screw
4 E21199-001 Bottom Plate
5 LPSP4008NS Assy Screw
6 Q0591 1 -1 Foot
7 SBSB3010M Tapping Screw I
4VN-99O - 2 -
Page 38
POWER TRANSFORMER VOLTAGE
RED BLU
BLK \ GRN
RED YUW
GRN ORN
GRN RED
BLU BRN
BLU
26V RED 0 <9 BLU 120V
3.5A BLK C g 0 GRN IOOV
26V RED
YLW 0V
35V GRN a ORN 120V
0.3A GRN or 0 RED IOOV
5' BL Z:
0.5A BLU BRN 0V
Fig. 37
PROTECTOR ADJUSTMENT
The protector circuit dosent operate at 40 load, 14V output. (All channels are driven).
Adjust the R522 in order to actil activate the protector circuit by grounding the speaker terminals when the out put is
2 volt at 89. load.
And adjust R513 in order to activate the protector circuit by appling DC 0.25 volt to point A.
VU METER control adjustment
PROTECTOR CIRCUIT
TAC - 2 80
V V
R522 R514
METER common. cmcunr
TA C -250
V5 V v V
R603 R601 R602 R601.
CONTROL VOLUME
Fig. 38
4VN-990 _ 38 _.