Arcam FMJ P7, Service Manual, Page: 32 / 40

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DRAWING NO.
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DRAWING TITLE
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DATE
Filename
ECO No. DESCRIPTION OF CHANGE
J:\Development_Projects\P7_Amp\Transformer Design\L921tx_1.ddb - Documents\L921TX_1.Sch
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
AUX TOROIDAL TRANSFORMER P7 100V (JAPAN)
Circuit Diagram
L921TX
KAL
6-Mar-2002
INITIALS
Date Printed
1 1 Sheet of
Notes:
BROWN
WHITE
BLACK
BLUE
ORANGE
RED
100V ac
100V ac
Transformer Specification For 100V (JAPAN) P7 Auxilliary Transformer
Arcam Part Number L921TX
Material Safety Specification
1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995
2. Mylar Polyester Insulator 130C Rated
3. Potting Compound PC3502 E135297(M)
Mechanical Specification
1. Middle of transformer to be potted. Potting to be drilled out with an 6mm DIA Hole
and then the bottom surface counterbored to a depth of 12mm with a 12mm dia drill
as shown. Actual part which the counterbore is designed to clear extends up to 10mm from
transformer mounting surface into counterbore.
2. Primary windings connect to 6 way MOLEX 39-01-2065. Secondary
windings connect to 4 way molex connector 39-01-3048. Use MOLEX pin 44476-3112.
MOLEX connectors have pin numbers indicated on them.
3. Use 24 AWG wire with colours as shown. Primary wires are enclosed in a common
sleeve. Secondary wires are enclosed in a common screen. Use PVC sleeving.
4. All wire lengths in mm. Lengths are +5.0, -0
5. Please adhere rubber insulating pad to bottom of transformer as shown.
Electrical Specification
1. Transformer to have dual 100V primaries to allow parallel operation for
100V input.
2. Transformer input voltage range
100V -18% +14% (82V to 114V)
3. Transformer to have two secondary windings as show in the adjacent drawing.
4. Loaded DC voltages specified at 100V AC in (with transformer primaries in parallel)
DC supplies to be generated by configuring the seconday windings with a full wave bridge
(see diagram).
Output Capacitance to be 3300uF. 22V dc
Output Capacitance to be 1000uF. 9.5V dc
VOUT1 = 22.0V dc @ Io = 250mA (With 100V AC in)
V0UT2 = 9.5V dc @ Io = 150mA (With 100V AC in)
(this will ensure that VOUT2 is 8V at 82V AC in)
PRIMARY SECONDARY
6 WAY CONN PIN 3
6 WAY CONN PIN 1
6 WAY CONN PIN 6
6 WAY CONN PIN 4
4 WAY CONN PIN 3
4 WAY CONN PIN 4
1N4003 1N4003
1N4003 1N4003
+
3300uF
TEST CIRCUIT
500mA load
VOUT 1
GND
6 way MOLEX 39-01-2065
4 way MOLEX 39-01-3048
PRIMARIES
SECONDARIES
110mm
90mm
60 max
40 max
1
3
2
4
4 way 6 way
Pin outs of Molex connectors
As viewed looking down at the end
the wires enter the connector
Rubber insulating pad
PURPLE
YELLOW 4 WAY CONN PIN 2
4 WAY CONN PIN 1
1N4003 1N4003
1N4003 1N4003
+
1000uF
150mA load
GND
VOUT 2
1 2
5
3
4 6
TEST CIRCUIT (PER OUTPUT)
Voltage on Reservoir Capacitor
Vout1 = 22V
10mS
Vout2 = 9.5V
CENTRE TO BE POTTED AND DRILLED
OUT TO 6mm DIA
35mm
COUNTERBORE DIA 12mm
COUNTERBORE DEPTH 12mm
12mm
1 05/03/2002 KAL Based on spec of 115/230V part (L912TX)
UL94-V0