Hafler DH-110 manual

wire to hole Q, which is between the center lugs of Jll and 512. (S). The wire should not protrude sig- nificantly beyond the front surface of the board to avoid coming in contact with a connector. To assure a good solder connection, bare wire should be visi- ble on the circuit side of the board. Connect the green wire to hole P in like manner. (S).

44 0 At the rear of the phone jack, connect the black wire from the first group (lugs 2 and 3) to PC14 eyelet G3.

(S).

45[7 Select the other group of three wires, and connect the black wire to PC- 12 hole T. (S). Connect the red wire to hole S between Jl 11 and J112. (S). Connect the green wire to hole R. (S). Make sure the wires do not protrude significantly beyond the outside surface of the board.

460 Connect the black wire of the second group to PC14 eyelet G1. (S).

4713 Select the 2 red LEDs. To install these with correct polarity, observe the tiny ‘flat’ on the LED flange which marks the cathode lead. This must he towards the near end of the PC- 14 board, or Phono switch S 1, when the

LED is attached to the front, near the edge. When the nipple of the LED is pointed toward you, with the flat on the left, bend the leads (together, with long-nosed pliers) upward at a right angle, so the bend will be 7/10” from the back surface of the LED (about ¾”). Solder the LEDs to the front holes on the under side of PC-14 with the bent portion of the leads emerging on the top side. Each LED protrudes through the front sub-panel hole. Solder both leads on each LED.

480 Cut two ½”lengths of the black plastic shrink tubing. Slide a piece of tubing over each LED from the front, so only the nipple of the LED protrudes. Shrink the tubing around the LED body by holding a lighted match near the tubing. This will prevent back light from reflecting on the sub-panel.

490 Select the two flat knobs, 2 set screws, and the smal- ler L-shaped Allen wrench. Place a screw on the end of the wrench and thread it into each knob. Install these knobs on the switch shafts above the LEDs. The set screw should engage the flat on each shaft.

500 In like fashion install the remaining set screws in the 4 round knobs, and fix them to the flatted shafts on the other controls.

5 I 0 Taking care not to use excessive force, install the 6 black pushbuttons on the switches.

52cI Select a pair of end caps-either the standard ones, or those for rack mounting-and the black front panel extrusion. Place the front panel in position, taking care to insert the LEDs into their holes, and check for sufficient clearance around each knob. It is possible to shift the phone jack bracket slightly, or the mounting of an individual control (by resolder- ing) if necessary for correct alignment. Slip each end

cap into the slots of the front panel. Select the 4 cap screws and nuts, and secure the end caps with the large Allen wrench.

53 0 Install the appropriate loading capacitors at the pairs of holes identified E, F, G and H below the phono input sockets on the back panel board. The correct choice is discussed in the Additional Information section of this manual. In lieu of more specific in- formation, we suggest the 120 pF values at E and G for Phono 1, and the 220 pF values at F and H for Phono 2. Bend one lead around the capacitor so it is parallel with the lead at the opposite end. The leads should extend more than 1%” from the body, but must not be longer than %“, or they might touch the metal back panel. Plug each into adjacent pairs of holes.

Now check to make sure that there are no strands of power transformer leads, or the line cord, that are unsoldered. Where the line cord passes under the transformer, make sure it is clear of the screw hole in the back panel flange. Check that a 1/10 ampere (lOOmA) fuse is installed in the PC-14 clips, and that the Red/Yellow transformer lead connects to the corner eyelet A.

54 q A wire tie can secure the transformer leads to the side piece through the slot behind the PC-14 bracket. These ties can be used only once, and lock securely when the tail is pushed through the head end from the flat side. Cut off the excess after pulling it tight.

55 0 The two groups of output leads from the phone jack should be positioned at least 1” in from the side piece, and straight to the rear of the PC-14 board; then kept close to the bracket. A wire tie is suggested at the rear comer. You may wish to use the 3rd tie on the wiring to the AC sockets, or on the output leads near the back panel.

56 0 With 6 of the sheet metal screws, install the bottom plate. The 2 large holes should he near the phono inputs at the rear.

57 0 Place the 4 rubber feet in the corners of the bottom plate. They are self adhesive when you remove the paper backing.

580 Slide one piece of the U-shaped long plastic grommet onto the top flange of the front sub-panel. The other piece goes on the top flange of the back panel.

590 Check to make sure that the flat ribbon cable as- semblies are up close to the top of the unit, away from the circuit board, and slide the cover on from the tear. Secure it with the 4 sheet metal screws.

6017 Affix the self adhesive serial number label to the center rear of the bottom.

You may wish to secure the smaller Allen wrench for the knobs to the bottom of the unit with tape.