3M DELTA Series - General; Mechanical

SECTION VUI - MAINTENANCE
A. GENERAL
International Tapetronics Corporation/3M has
designed the Delta Series cartridge machine with
high reliability and minimum required maintenance
as primary design goals. A minimum amount of me 
chanical and electrical maintenance, when per 
formed on a regular basis, will allow the user to
realize optimum performance and trouble free op 
eration.
Permanently lubricated and sealed ball bear 
ings used in the DC servo motor require no lubrica 
tion. Any attempts to oil the bearings may cause
premature failure due to migration of oil into the
copper windings and ultimate breakdown of the
insulation material.
Sintered bronze bearings, used in the cross shaft
assembly, are also permanently lubricated and
therefore require no maintenance. A specially de 
signed TEFLON® coated solenoid plunger elimin 
ates the need for any lubrication. As in the case of
the motor bearings, any attempt to oil or lubricate
this assembly will ultimately cause damage and
poor operation.
B. MECHANICAL
1. Daily
— ITC recommends daily inspection and clean 
ing, if necessary, of the heads when the ma 
chines are used in heavy production. Use a
cotton swab dipped in isopropyl alcohol.
Weekly cleaning will suffice under less rig 
orous use.
2. Weekly
— Capstan Shaft and pressure roller
— Clean with a cloth dipped in isopropyl alco 
hol for maximum pulling characteristics,
lowest flutter and overall best speed accu 
racy. Remove all traces of tape lubricant
and tape oxide.
3. Monthly
— Pressure roller pressure solenoid adjustment,
see Section III.
— Check playback and recording head azi 
muth as outlined in Section III.
4. Every Six Months
— Inspect internal electronics and mechanics
for dirt or dust build up. As necessary, use an
air gun or dry paint brush to clean the units'
interior. CLEAN MACHINES LAST LONGER.
C. ELECTRICAL
1. Monthly
— Degauss all heads and tape guides carefully
following instructions included in the de 
gausser used.
2. Every Six Months
— Check and adjust playback high frequency
equalization.
— Check and adjust program recording bias
and program bias meter calibration.
— Check and adjust high frequency equaliza 
tion.
— Cue recording bias and cue bias meter cal 
ibration.
— Cue master level control.
D. RECOMMENDED TOOLS, GAUGES, AND TESTS
1. Hand Tools —
An assortment of hand tools common to an
electrical shop including a temperature-reg 
ulated soldering station. A 3/8" and 9/16"
open-end wrench are required for solenoid
adjustments. A 1/16" Allen hex wrench is
required for head adjustments.
2. Test Equipment
Oscilloscope, with 10:1 test probes;
High impedance voltmeter;
Audio oscillator;
Flutter meter capable of measuring DIN
WTD flutter;
Frequency meter; and
Logic probe.
3. Gauges —
These may be ordered from ITC:
ITC gauge 830-0043-00 L a capstan shaft lo 
cator gauge;
ITC gauge 830-0042-011, a pressure roller
pressure gauge; and
ITC gauge 830-0041-022, a head height and
tape guide gap adjustment gauge.
4. Miscellaneous —
Set of test extender PC boards
831-0276-003 18 pin double-sided for Delta
IV
831-0277-003 18 pin double-sided for Record
Logic Cards
831-0278-003 18 pin double-sided for Record
and Meter Amp Cards
831-0279-003 18 pin double-sided for Play/
Cue cards
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