Hafler DH-500 manual Chassis Wiring

40 0 Prepare two 9” white wires. Connect one to eyelet #8 of the left board. (S). Connect the other to eyelet #6. (S). Bend these toward the bottom, and twist them together.

41 0 Prepare a 3” white wire and connect it to eyelet #3.

(S).

42 0 Prepare a 6” green wire and connect it to eyelet #10

(S). Set the module aside temporarily.

CHASSIS WIRING

43 0 Select the chassis and the .39 mfd capacitor. Trim each lead to 1/2". Connect one lead of the capacitor to L T lug #3. Connect the other lead to lug #4.

44 I-J Select the silicon diode. Note that one end has a stripe for identification. Connect the striped end to LT lug #3. Connect the other lead to lug #2.

45 0 Select the 1/2 watt 1 megohm (brown-black-green) resistor. Trim each lead to l/2” and connect one lead to LT lug #2. (S-2). Connect the other lead to LT lug #l.

46 0 Prepare a 7-1/2” white wire. Connect one end to LT lug #1. (S-2). Connect the other end to fuse clip FC lug #l. (S).

47 0 Prepare a 12”green wire. Connect one end to LT lug #3. (S-3).

48 0 Select one of the spade lugs. Connect it to the other end of the green wire just attached to lug #3. (S).

The proper way to connect one of the spade lugs to the wire is to bend the shorter, wider set of tabs tightly around the bare wire, and bend the outer, longer set of tabs around the insulation. Then flow solder into the joint around the bare wire.

49 q Check both conductors of the power cord to see that they are tinned to secure every strand. Con- nect one lead of the power cord to FC lug #2. (S).

50 0 Select another spade lug and connect it to the free end of the power cord. (S).

51 q Prepare a 13” white wire. Connect one end to the lower hole of LT lug #6. (S). Using the lower hole will make it easier for other wires to be connected to the same lug.

NOTE FOR MULTIVOLTAGE OPTION: This wire may need

to be 1” longer, and may connect to another termi- nal for some line voltages.

52 q Select the spade lug and connect it to the free end of the white wire from LT lug 6. Place this wire to the left, and twist it lightly together with the green wire from LT lug 3.

When connecting wires to the PC-9 circuit board note that the eyelets on this board are numbered in the reverse direc- tion from the lug numbers on the terminal strip.

53 q Prepare a 23/4" red wire. Connect one end to PC-9 eyelet #8. (S). Connect the other end to relay RY lug #7.

54 0 Prepare a 2” yellow wire. Connect one end to PC-9 eyelet #7. (S). Connect the other end to RY lug #9.

55 /J Strip a 1-1/2“length of heavy wire bare. Connect one end to large capacitor CL lug X2. (S). Connect the other end to CR lug #3. (S). Be very sure that these connections are well soldered because they will carry considerable current.

56 0 Prepare an 8-1/2” red wire. Connect one end to PC-9 eyelet #6. (S).

57 0 Prepare a 19’black wire. Connect one end to PC-9 eyelet #5. (S).

58 q Prepare a 9” yellow wire. Connect one end to PC-9 eyelet #4. (S).

59 0 Place the red, black and yellow wires toward the left and twist them lightly together. Keep these against the chassis and connect the red wire to dual fuse clip FR lug #5. Connect the yellow wire to FR lug #6. Connect the black wire to the center of the bare wire between the two capacitors CL and CR.

(S). Six other wires will be connected to the center of this bare wire. The amplifier will have the lowest hum if the last wire to be connected (from the transformer -a heavy wire) is placed in the exact center of this link between the two capacitors, so leave a small space for it. However, all 7 wires should be connected as near to the center point as possible.

60 c] Prepare a 41/2” red wire and connect one end to PC-9 eyelet #3. (S).

61 /-J Prepare a 5-3/4” yellow wire and connect one end to PC-9 eyelet #2. (S). Place this wire and the red wire from eyelet 3 to the left. Twist them lightly together and connect the red wire to RY lug #B. (S). Con- nect the yellow wire to RY lug #A. (S).

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