Nad 3140 Service Manual
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Extracted text from Nad 3140 Service Manual (Ocr-read)
Page 28
NAD (USA). INC.
675 Canton Street
Norwood, Massachusetts 02062
Telephone: (617) 769-7050 Telex: 924442
SERVICE BULLETIN
SB USA 040 3140, 2140 BRIDGED STABILITY 10/22/81
3140, 2140 can be made more stable in the bridged mode by relocating the
bridging signal pickoff point, as follows:
1) Turn unit over, knobs facing you, remove bottom cover
2) Locate wiper (middle terminal) of left half of bridge switch, out foil
just to left of wiper
3) Connect one end of a 105" piece of insulated wire to the bridge switch
wiper
4) Connect other end of wire to rearward terminal of choke coil L602
(2" forward of left-most output transistor), immediately behind
lettering "SFL - SB - 2A94V1" or "AE3" (depends on production run).
Paul J. Ceurvels
WWW
National Service Manager