Final Steps - Eico HF 12 Instruction Manual

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FINAL STEPS
You have now completed .the assembly and wiring of your amplifier. When
you have completed the following steps your amp Iifier wi II be ready for use.
1) To catch any wiring errors
, it is suggested that the entire wiring be checked
point-by-point against the wiring instructions (and preferably also against the
schematic wiring diagram in order to become more fami Iiar with the component
layout and circuitry) . While doing so, check for rosin joints, loose lumps of
solder, poor lead dress, and accidental shorts or leakage poths arising from the
flow of rosin between contacts (remove wi th a stiff brush dipped in carbon tet-
rachloride, being careful not to spring contacts when cleaning switches).
2) Insert the pilot lamp in its socket and tubes Vl through V6 in their sockets.
Be sure to insert the correct tube in each socket . Place a shield over tube Vl .
See tube layout in instruction section (Fig. A).
3) If you have a VTVM or YOM, make the following resistance checks before
connecting to the o-c line: Check for a cold d-c resistance of at least 2 ohms
across the c-c line plug; check for a resistance of at least 65 ohms between
ground and pins 1 and 7 of XV6; check for a resistance of at least 40KQ be-
tween pins3 & 90f XV6 and ground. Allow sufficient time for the electrolytic
capacitors to be charged by the ohmmeter battery in this last measurement.
These measurements constitute a reasonable check of the power supply com-
ponents and wiring before applying power . If you do not obtain the minimum
resistance values indicated, do not procede to the next step until the cause is
discovered and the condition remedied.
4. ( ) Fig. 7. Assemble the left and right side pieces to the chassis. Each
side piece is mounted with two '8-32 X 3/8 brown colored screws, two '8-32
hex nuts , and two '8 lockwashers.
5. ( ) Fig. 7 . On the rear edge of the chassis surface, mount the two Tinner-
man speed nut angle brackets, using a 'S P. K. - Type Z screw for each.
6. ( ) Fig. 7. On the bottom flange of each side piece, press a Tinnerman
'S-32 - Type J speed nut in place over each of the three holes.
7. ( ) Fig. 7 . Mount the bottom plate on the bottom flanges of the side pi eces,
using six '8-32 X 3/8 uncolored screws. Note that the rear flange on the bot-
tom plate fits over the outside of the rear chassis apron .
8. ( ) Fig. 7. Install the rubber feet in the openings provided in the bottom
plate. The method is to work the rounded portion of each foot into the interior
of the cabinet from the outside, using a small screwdriver . The flat portion
shou Id be the actual resting or contact surface .
9. ( ) Fig. 7 . Insert the perforated cover into the" rai Is" on the side pieces
and slide it forward fully.
10. ( ) Fig . 7 . Mount the control plate on the bezel (locating the hole for
the plastic pilot jewel in the lower right-hand corner of the control plate over
the corresponding hole in thebezel), using two each'4-40 X 1/4 brass screws,
'4 lockwashers, and'4 hex nuts to fasten it to the bezel. Press the plastic pi lot
jewel into place on the control plate.
11. ( ) Fig. 7. Fit the bezel and control plate over the projecting control
shafts , onto the ends of the side pieces and the perforated cover. Assemble the
bezel to the side pieces with four '6 X 1/4 brown colored P.K. screws . Be-
fore tightening the screws finally, be sure there is adequate play to slide the
perforated cover out.
12. ( ) Fig. 7 . Fasten the perforated cover to the two Tinnerman angle brackets
(previously mounted on the rear edge of the chassis surface), using two'8 P. K.
Type Z screws .
13. ( ) Fig. 7. Set all controls to the furthest counter-clockwise position.
Mount the knobs on the shafts with the indicating dots pointing as follows:
SELECTOR knob at AUX; VOLUME knob at 0; BASS knob at -5; TREBLE knob
at OFF.
14) OPERATIONAL CHECKS ON COMPLETED KITS: In the INSTRUCTION
partof thismanual you will find a section titled "Electrical Installation. Read
thiscarefullyandconnectyour speaker, phonograph, and tuner to the amplifier
in accordance with the instruc ti ons given. Then read the section titled "Oper-
ating Instructions" and operate all the controls, checking aurally for the results
described.
If
the amplifier does not operate at all or operates incorrectly, use
the TROUBLE-SHOOTING chart and the VOLTAGE & RESISTANCE chart to
discover and remedy the difficulty. As the Trouble Shooting Chart presumes a
properly wired amplifier, which may not be the case, recheck the wiring for
errors or reversed connections and continuity .
15) If the amplifier is tobe mounted in a console, read carefully the "Mechan-
icallnstallation"sectlonof the instructions andfollow the proceduresoutlined.
16) Detailed information as to connection of phonograph, tuner, etc ., to the
amplifier inputs and speaker systems to the amplifier output, as well as a-c
Iine pi ug connectIons and use of the hum adjustment control, is given in the
"Electrical Installation" section.