tion is reached release the "Fast Forwardt'knob and
set the machine for normal playback.
To Edit And Splice Tape:
NOTE: It is impossible to edit and splice one track
of a tape without affecting the other track.
Therefore any recordings to be edited should
be limited to one track only.
l. The tape may be edi.ted by cutting out unvanted
sections, joining selections in another sequence, in-
serting announcements, etc. Unused sections can be
spliced together for reuse.
2. Forbest results, cut tapeat a slightdiagonal,
join ends together with splicing tape and cut off any
excessive width.
CAUTION: Do not use ordinary cellulose tape because
it will bleed through causing the tape to
stick together.
Erasing Recorded Material:
1. When a recording is being made the tape is
automatically erased on the track that is being re-
corded. The second half of the tape is not affected.
2. To erase a recording without recording new
material on the tape, proceed to record as normally
except turn the volume control completely down.
ADJUSTMENTS
Record/ Playback Head Adjustment:
The record-playback head is mounted to the
front panel by two scre\ps in a hinge arrangement.
Adjust as follows:
1. Thread an alignment tape into the unit as de-
scribed under "Threading The Taperr.
2. Connect an audio voltmeter or oscilloscope
to the output of the playback amplifier.
3. Playback a section of the alignment tape and
adjust the volume control until a convenient reading
ig obtained.
4. Again start the tape over the heads. While
observing the output reading adjust the left-hand head
mounting screw for maximum reading. When the
mildmum has been reached the head is properly
aligned.
NOTE: It is advisable to first loosen the left hand
screwto mal<e sure that when adjustingit will
pass through the maximum reading. Final
adjustment should leave the screw set for
maximum reading.
Hum Adjustment:
The record-playback head shield is adjusted to
reduce hum as follows:
l. Rockingthe head shieldwill produce anotice-
able variation in hum level.
2. Adjust the shield to the position which gives
PAGE 4
the lowest hum level, with the volume control set at
maximum, the unit stopped, no tape on the head, and
set in the "Playback[ position.
3. Realign the head alter the hum adjustment.
CAUTION: Neverlet the head cover drop on the head.
This not only affects the hum adjustment,
but also the head alignment.
Rewind And Take:Up Drag Adjustment:
Adjustments to the friction drag system are
measured by means of a 0 to I pound spring scale
fastened to string wound several times around the hub
of a ?" reel. Place the reel on the spindle to be ad-
justed and pull on the scale slowly until the reel re-
volves. Note the reading. The rewind drag should
be set at 3 to 4 ounces and the take-up drag at 6 to ?
ounces.
Adjustment is made by loosening the socket
head set screw in split nut (96) or (104) rotating the
split nut and tightening the set screw again before
measuring. Knurled nut (I04) adjusts rewind drag
and nut (96) adjusts take-up drag.
CLEAN ING
The head assemblies, pressure roller, and
capstan are subject to an accumulation of tape coating
residue, which is worn off the tape as it passes these
parts. Use a soft cloth dipped in carbon tetrachloride
to clean these parts, being careful not to saturate the
pressure roller and heads. Saturation of these parts
with carbon tetrachloride can canse damage to the
tape and oilite bearings.
CAUTION: Donot use a brushwhencleaning theheads
ae this could possibly mar the pole
surfaces.
LUBRICATION
Most bearings in this unit are of the porous
bronze (oitite) type that retain oil over long periods
of time. The bearings are kept damp by felt wick.
pads. Oil should be applied to the wicks, and not the
shafts or bearings. Use a good quality SAE #30 oil"
Motors:
Two or three drops on front and back bearings
every 6ix months.
Capstan ShaJt Bearings:
Two or three drops on felt pads every six
months.
Intermediate Idler Wheels:
One drop of oil on felt washers every six
months.
Take-Up Clutch And Rewind Brake:
Do not oil unless squeaking, then one or two
drops of oil on felt pads.
