Shure SR105 service manual Grn Red Yel Blk, Wht, Com

SR105B AMPLIFIER CONVERSION

	PARTS			MATERIALS
	Shure	Description	Qty.	Description
Qty.	Part No.
1	51A244	Transformer, 70V	2	Locknuts, 10-32*
		Output (T3)
1	55C131	Switch, Slide, DPDT	2	Machine Screws,
		6 4 )		Phillips Round
				Head, 4-40 x 3/16"
1	56A204	Terminal Strip, 3-	4	Machine Screws,
		Screw-Terminal (TS2)		Phillips Head,
				6-32 x % "
1	90A2038	Filter Circuit	4	Machine Screws,
		Board Assembly		Phillips Head,
		(A21		6-32 x '1'4"* *
			-	Wire, Hookup,
				16 Gauge AWG,
				Stranded Copper,
				Vinyl Insulation
			-	Wire, Hookup, 20
				Gauge AWG, Stranded
				Copper, Vinyl
				Insulation
			-	Solder, Rosin-Core

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TOOLS

Description

Pliers, Diagonal, or Wire Stripper

Pliers, Long-nose

Screwdriver

Screwdriver, Phil- lips Head

Soldering Iron, Low Wattage

Wrench, Open-End, Adjustable

Two locknuts are presently securing lamp socket assemblies; two more are required.

*'Four machine screws presently securing rear-panel 70-Volt Conversion Cover (53A1319) may be used.

				T 3
			GRN	RED
			YEL
		r	BLK
				-	J4 - J 7
					WHT
					WHT
					I-
					-
TS 2 0	0	0		d	0 TS I
COM	CT	7 0 V		2 8 V	GND
FROM FILTER CIRCUIT			s4-	OFF
BOARD PIN V
FROM MAIN CIRCUIT	YEL/BLK
BOARD PIN J
FROM FILTER CIRCUIT	BLU	0		0
BOARD PIN T				7 0 V

FIGURE 15. 70-VOLT CONVERSION: ADDED CIRCUITRY

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