Ampex ATR-700 User manual

1
o
■
I
OPERATION AMD MAINTENANCE
/■
AMPEX
audio - video
SYSTEMS DIVISION
V-
! '
CATALOG NO. 4890410-02
ISSUED: OCTOBER 1977

ATR-700
RECORDER/REPRODUCER
OPERATION AND MAINTENANCE
WARNING
AMPEX CORPORATION
AUDIO-VIDEO SYSTEMS DIVISION
CATALOG NO 4890410-02
ISSUED: OCTOBER 1977
5
o
T is equipment generates, uses, and can radiate
radio frequency energy and if not installed and
used in accordance wit t e instruction manual,
may cause interference to radio communications.
As temporarily permitted by regulation it as not
been tested for compliance wit t e limits for
Class A computing devices pursuant to Subpart J
of Part 15 of FCC Rules, w ic are designed to
provide reasonable protection against suc inter 
ference. Operation of t is equipment in a residen 
tial area is likely to cause interference in w ic
case t e user at is own expense will be required
to take w atever measures may be required to
correct the interference.

Prepared by
K
ii
AVSD Tec nical Publications
Ampex Corporation
401 Broadway
Redwood City, California 94063
CATALOG NO 4890410-02
ISSUED: OCTOBER 1977

i.
TABLE OF CONTENTS
►
PAGE NO.
PARAGRAPH NO.
TITLE
SECTIONS OPERATION
SECTION 4 THEORY OF OPERATION
Hi
AMPEX 4890410-02
1-1
1-2
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
4-1
4-2
4-3
4-4
4-5
SECTION 1 GENERAL INFORMATION
Description
Specifications
SECTION 2 INSTALLATION
Unpacking and Inspection
Installation Site
Rack Mounting
AC Voltage and Frequency Conversion
Initial Connections
Input Connections
Output Connections
Verification of Connections
Optional Modification for Line Output Metering . .
Controls and Indicators
Pre-Operating Procedures
Reel Installation
Small Hub Reels
Large Hub Reels
Holddown Knob Spacer Removal . .
T reading t e Tape
Operating Procedures
Recording
Sync ronous Reproduce Recording . . .
MIC Recording
MIC-LINE Mixing
LINE-LINE Mixing
Reproducing
Editing
Erasing
Tape Transport T eory
Sequence of Operation for Eac Mode
Play Mode
Fast Forward Mode
Fast Rewind Mode
2-1
2-1
2-4
2-4
2-6
2-6
2-6
2-6
2-10
3-1
3-12
3-12
3-12
3-12
3-13
3-14
3-14
3-14
3-17
3-17
3-18
3-18
3-18
3-19
3-20
4-1
4-1
4-1
4-1
4-2
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
1-1
1-2

5
TABLE OF CONTENTS (Continued)
TITLE
PAGE NO.
PARAGRAPH NO.
SECTION 4 THEORY OF OPERATION (Continued)
SECTIONS
MAINTENANCE
iv
AMP EX 4890410X12
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
4-26
4-27
4-28
4-29
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
Record Mode
Pause Mode
Stop Mode
Reel Hub Size Selection
Power Line Frequency Selection (50 Hz/60 Hz) . .
Solenoid Drive Circuit
Rewind Stop Unit
EDIT switc
Signal System T eory
Reproduce Operation
Reproduce Equalizer Amplifier .
Reproduce Line Amplifier
Buffer Amplifier
Line Output/P one Amplifier
Sync ronous Reproduce Operation
Record Operation
Input Selector
Mix Line Amplifier
Record Amplifier
Bias Oscillator
Meter Amplifier/Stabilizer
Switc board A
Switc board B
Head Select PWA
Test Equipment
Cleaning ...............................
Demagnetizing
Lubrication
Pinc Roller
Capstan S aft
Digital Counter Roller
Electro-Mec anical C ecks and Adjustments . . .
Panel Removal
Capstan S aft Tolerance Adjustment
Coarse Head Adjustment
Pinc Roller Pressure C eck and Adjustment . .
5-1
5-2
5-2
5-3
5-3
5-3
5-4
5-4
5-4
5-5
5-5
5-6
4-2
4-2
4-2
4-2
4-2
4-9
4-9
4-9
4-10
4-10
4-10
4-10
4-14
4-15
4-15
4-15
4-15
4-16
4-17
4-18
4-18
4-18
4-23
4-23

TABLE OF CONTENTS (Continued)
PAGE NO.
TITLE
PARAGRAPH NO.
v
AMPEX 4890410-02
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
5-28
5-29
5-30
5-31
5-32
5-33
5-34
5-35
5-36
5-37
5-38
5-39
5-40
5-41
5-42
5-43
5-44
5-45
5-46
5-47
5-48
5-49
5-50
SECTIONS MAINTENANCE (Continued)
Tension Measurements and Adjustments . . . .
Back Tension (Play Mode)
Takeup Tension (Play Mode)
Fast Winding Back Tension
Fast Winding Tension
Brake Torque Measurement and Adjustment . .
Brake Band and Drum Clearance Adjustment . .
Performance Tests
Test Equipment
Tape Speed and Wow Flutter Test
Reproduce Signal-to-Noise Ratio
Reproduce Frequency Response
Overall Frequency Response
Overall Signal-to-Noise Ratio
Electrical C ecks and Adjustments
DC Voltage Adjustment
Tape Speed Adjustment
Reproduce Head Alignment
Reproduce Output Level Setting
VU Meter Setting
Frequency Response
Reproduce Signal-to-Noise Ratio
Headp ones Output Level
Monitor Performance C ecks
LINE Input Level C eck
MIC Input Level C eck
Record Adjustments
Bias Trap Adjustment (Record)
Bias Trap Adjustment (Reproduce)
Bias Setting Adjustment (Position 3) . . . .
Record Level Set
Frequency Response Adjustments
Bias Setting at Position 3
Bias Setting at Position 2
Bias Setting at Position 1
Dummy Coil Adjustment
Overall Signal-to-Noise Ratio
Distortion C eck
5-7
5-7
5-10
5-11
5-12
5-12
5-14
5-14
5-15
5-16
5-17
5-17
5-18
5-18
5-20
5-20
5-20
5-21
5-22
5-23
5-23
5-23
5-25
5-26
5-26
5-26
5-27
5-27
5-27
5-27
5-28
5-28
5-28
5-28
5-28
5-29
5-29
5-29

TABLE OF CONTENTS [Continued)
TITLE
PAGE NO
PARAGRAPH NO
SECTION 5 MAINTENANCE (Continued)
i
PARTS LISTS AND SCHEMATICS SECTION 6
List of Assemblies and Sc ematics
6-ii
P 1 '
vi
AMPEX 4890410-02
5-51
5-52
5-53
5-54
5-55
5-56
5-57
5-58
5-59
Erasure
Crosstalk
Replacement of Parts
Head Assembly and Head Replacement
Capstan Motor Replacement
Replacement Capstan
Motor wit Different Speed
Reel Table Replacement and Heig t Adjustment . .
Reel Motor Replacement
Troubles ooting
5-30
5-30
5-31
5-31
5-32
5-33
5-33
5-34
5-35

LIST OF ILLUSTRATIONS
PAGE NO
TITLE
FIGURE NO
1-6
ATR-700 External Dimensions
1-1
vii
AMPEX 4890410-02
3-1
3-2
3-3
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
Unpacking t e ATR-700
ATR-700 in Uprig t Position
Rack Adapter Installation
Screw Locations for Panel Removal . . . .
Voltage and Frequency Conversion . . . .
Voltage Conversion Plug
50 Hz/60 Hz Frequency Conversion Switc .
Rear Connector Panel
Rear Connector Panel — Initial Connections
Reel Table Spindle . . .
Large Hub Reel Installation
Tape T reading Pat . .
Control Unit Sc ematic
Power Supply Sc ematic
Timing Diagram
Switc board A Sc ematic
Signal System Block Diagram
Signal Level Diagram
Reproduce Equalizer Amplifier Sc ematic
Reproduce Line Amplifier Sc ematic . .
Output/P one Amplifier Sc ematic . . .
Output Transformer PWA Sc ematic . .
Input Selector PWA Sc ematic . . . .
Mix Line Amplifier Sc ematic
Record Amplifier Sc ematic
Bias Oscillator Sc ematic
Meter Amplifier/Stabilizer Sc ematic . .
Switc board B, C Sc ematic
Head Assembly Sc ematic
Lubrication Points
Digital Counter Roller Location . .
Digital Counter Roller Lubrication .
Connector Panel Screws
Capstan S aft Tolerance Adjustment
Head Alignment
Tape Positioning for Head Alignment
3-13
3-13
3-15
4-3
4-4
4-5
4-8
4-11
4-12
4-13
4-15
4-16
4-17
4-19
4-20
4-21
4-22
4-22
4-24
4-25
5-3
5-4
5-4
5-5
5-6
5-7
5-8
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
5-1
5-2
5-3
5-4
5-5
5-6
5-7
2-2
2-3
2-4
2-5
2-7
2-8
2-8
2-9
2-9

LIST OF ILLUSTRATIONS (Continued)
PAGE NO.
TITLE
FIGURE NO.
viii AMPEX 4890410-02
Pinc Roller Pressure Measurement . . .
Pinc Roller Mounting Screws Location .
Pinc Roller Pressure Adjustment . . .
Tension Measurement
Torque and Tension Adjustment Resistors
Torque Measurement
Brake Assembly
ASA "A" Weig ted Filter
Test Connections
DC Voltage Adjustment
Tape Speed Adjustments
Locations of Electrical Adjustments . .
L701 Dummy Coil
Head Assembly Removal
Head Assembly Connectors
Head Disassembly
Capstan Motor Removal
Reel Table Removal
Reel Heig t Adjustment
Reel Motor Assembly Removal ....
Troubles ooting Flow C art
5-8
5-9
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
5-28
5-29
5-8
5-9
5-11
5-12
5-13
5-14
5-15
5-17
5-19
5-21
5-22
5-24
5-29
5-32
5-32
5-33
5-34
5-34
5-35
5-36
5-37

LIST OF TABLES
PAGE NO
TITLE
TABLE NO
2-10
Input Connections
2-1
3-16
4-7
4-14
4-3
4-23
ix
AMPEX 4890410-02
3-1
3-2
3-3
3-4
4-1
4-2
1-1
1-2
1-3
5-1
5-2
5-3
5-4
5-5
5-6
5-7
ATR-700 Versions . .
ATR-700 Specifications
Accessories and Options
Operating Controls
Input and Output Controls
Head Housing and Tape Counter Controls
Switc Settings for Normal
Record and Reproduce Operations . . .
Sequence of Output Signals in Control Unit
State of Reproduce/Equalizer Amplifier
Transistors for Various Tape Speeds and Equalization Curves .
State of Transistors in Record Amplifier
for Various Speeds and Equalization Curves
Test Equipment and Material
Tension Measurements
Ampex Test Tapes
RECORD Switc Settings for Four Types of Tape . .
DC Voltage Test Points and Adjustments
Frequency Response Limits
Frequency Response Adjustment Potentiometers . .
3-1
3-7
3-10
1-2
1-2
1-5
5-1
5-11
5-16
5-19
5-20
5-25
5-25

T1
ATR-700 Recorder/Reproducer
AMPEX 4890410-02
X

SECTION 1
GENERAL INFORMATION
DESCRIPTION
1-1.
1-1
AMPEX 4890410-02
T is manual contains general information, instal 
lation, operation, t eory of operation, and main 
tenance information for t e ATR-700 Recorder/
Reproducer, Ampex Part No. 4010270-4010275.
(See Table 1-1 for configuration/part number
information.) Parts lists and sc ematics are also
included in t e last section of t is manual.
T e first section of t is manual contains general
description and specifications for t e ATR-700.
T e ATR-700 is a ig ly reliable, professional
audio magnetic tape recorder/reproducer designed
for use wit 1/4-inc tape and 5, 7, or 10-1/2-inc
reels. It is available in six versions; all are switc 
able between NAB and I EC equalization. Eac
unit offers two selectable speeds; 7-1/2 and 15 in/s
in t e ig -speed models, and 3-3/4 and 7-1/2 in/s
in t e low-speed models.
T e ATR-700 is available in t ree different ead
configurations; full track, two track, and quarter
track wit eit er one or two c annel capability. All
units include two c annels of electronics, allowing
easy conversion of full-track units to two track or
quarter track operation. Table 1-1 s ows t e con 
figurations of t e six available versions.
T e electronics of t e ATR-700 feature IC logic
control for error-free operation. Motion sensing
logic allows c anging from fast forward or rewind
mode to reproduce mode smoot ly and wit out
tape spillage or damage. Reproduce mode begins
s ortly after t e motion sensing circuitry deter 
mines t at tape motion as stopped. No preset or
automatic delays are necessary. T e direct drive
de servo capstan motor provides positive tape
control un ampered by belts t at could introduce
wow and flutter or tape speed variations.
T e standard ATR-700 utilizes t ree eads: an
erase ead, a record ead, and a reproduce ead.
A space is reserved on t e rig t side of t e ead
assembly for installation of a fourt ead (a
second reproduce ead), w ic may be ordered
as an option. C anging a ead assembly is a simple
operation and requires only minor adjustments.
Two-c annel versions feature t e sync ronous
reproduce mode w ic makes it possible to switc
t e record ead of eit er c annel to t e reproduce
mode for monitoring t at c annel. T us, c annels
recorded at different times are in perfect sync ron 
ization.
A digital tape counter allows direct reading of t e
elapsed time in minutes and seconds w en t e
ig er tape speed is selected. (For lower tape 
speed operation, t e reading must be multiplied
by two for actual elapsed time.)
Tape editing is greatly simplified in t e ATR-700.
Pressing t e EDIT button during reproduce mode
disables t e takeup motor and allows dumping of
unwanted tape from t e supply reel. T e EDIT
button also causes t e tape lifter to be retracted
to allow manual cueing in stop mode. A VARI-
SPEED control can be used to vary tape speed by
T e two-c annel ATR-700 as a built-in "four-in/
two-out" mixer (two-in/one-out for eac c annel).
Four microp ones, four line inputs, or two micro 
p ones and two line inputs can be mixed down to
two c annels. For full-track models, two inputs
can be mixed down to one c annel. MIC ATT
switc es on t e rear connector panel allow selec 
tion of 20 dB of microp one input attenuation.
In addition., t e t ree-position RECORD LEVEL
switc selects t ree levels of attenuation to t e
signal (input or tape) fed to t e vu meters, LINE
OUT jacks, and eadp ones. T is allows easy
calibration c anges to accommodate eit er con 
ventional or ig -energy tapes.

Table 1-1. ATR-700 Versions
3-3/4 and 7-1/2
4010270
1
Full Track
No
4010271
7-1/2 and 15 1
Full Track
No
4010272
3-3/4 and 7-1/2 2
Two Track
Yes
4010273 7-1/2 and 15 2
Two Track
Yes
4010274
3-3/4 and 7-1/2 2
Quarter Track
Yes
4010275
7-1/2 and 15
2
Quarter Track
Yes
SPECIFICATIONS 1-2.
Figure 1-1 s ows ATR-700 external dimensions.
Table 1-2. ATR-700 Specifications
Tape Transport
Ampex No. 456 (Grand Master) and No. 406, or equivalent. Tape recommended:
Tape widt :
1/4 inc .
5, 7, 10 1/2 inc per ANSI and NAB standards.
Reel sizes:
Reel ub size selector:
2 positions: LARGE or SMALL reel ubs.
Tape speed:
Tape speed accuracy:
Wit in ±0.3% at bot speeds.
Wow and flutter:
1-2
AMPEX 4890410-02
Switc able two speed: 3-3/4 and 7-1/2 in/s or 7-1/2 and 15-in/s.
Adjustable pitc range ±5%. Not field convertible between models.
±5% in order to compensate for tonal variations
of instruments recorded at different times.
Ot er important features of t e ATR-700 include:
a rewind-stop MEMORY switc ; full remote con 
trol capability (using t e optional remote control
box); quick-lock reel olddown knobs; a flip-open
ead ousing to facilitate editing and ead main 
tenance; a cue mode; a pause mode, to prepare
for record or reproduce operation; and a universal
power transformer w ic allows t e ATR-700
to accept 100, 120, 220, or 240-Vac input at a
frequency of eit er 50 or 60 Hz.
AMPEX
PART NUMBER
NUMBER OF
CHANNELS
TAPE
SPEEDS (IN/S)
0.08% Wrms at 7-1/2 and 15 in/s. 0.12% Wrms at 3-3/4 in/s.
Weig ting is NAB measured by t e reproduce met od.
Table 1-2 gives specifications and performance
c aracteristics for t e ATR-700 Recorder/Repro-
ducer. T ese specifications are subject to c ange
wit out prior notice. Table 1-3 gives accessories
and options available wit t e ATR-700.
HEAD
CONFIGURATION
SYNCHRONOUS
REPRODUCE MODE

o
Table 1-2. ATR-700 Specifications (Continued)
Tape Transport (Continued)
Approximately 90 seconds for 1200-foot reel in eit er direction.
S uttle time:
T ree-motor direct-drive.
Tape drive system:
DC servo motor, direct drive.
Capstan motor:
Head configuration:
Manually defeatable tape lifter:
Lever type for cueing.
Motion sensing:
Vertical or orizontal.
Operating position:
Mounting:
Transport controls:
Remote controls:
FAST FWD, FAST RWD, STOP, PLAY, RECORD, PAUSE.
UL/CSA
Safety standard approval:
Electronics:
+4 dBm, 600 o ms, balanced. (Can be set up for +8 dBm)
Line output:
+24 dBm.
Maximum line input:
-10 dB (0 dB = 0.775V), 100K, unbalanced. Line input:
Mic input:
Maximum mic input (attenuator off) : -30 dB (0 dB = 0.775V)
Cannon XLR-3-31 Input connector:
1-3
AMPEX 4890410-02
3 eads for erase, record, and reproduce in 1 -track 1 -c annel ( as
basic 2-c annel electronics), 2-track 2-c annel, or 1/4-track 2-c an-
nel. In addition to above, space is provided for a fourt ead.
Circuit to detect complete stop of tape before going into t e play
mode w en PLAY button is pus ed during fast-forward or rewind.
Delay time from stop to next motion is 0.7 ±0.3 second.
Can be installed in standard 19-inc rack (uses vertical rack mount
adaptor, included).
FAST FWD, FAST RWD, STOP, RECORD, EDIT, LIFT DEFEAT,
PLAY, PAUSE, VARI SPEED, REEL ub size.
-70 dB (0 dB = 0.775V), 600 o ms, balanced wit switc able
-20 dB attenuator.
Tape timer (wit rewind-stop memory): Indicates in minutes and seconds to a maximum of 99 minutes and
59 seconds; indications are for t e ig er speed (7-1/2 or 15-in/s).
Accuracy is wit in ±10% max error.

Table 1-2. ATR-700 Specifications (Continued)
Electronics (Continued):
Cannon XLR-3-32.
Output connector:
NAB or IEC, switc able on rear panel.
Equalization:
15 in/s:
Eq/Bias/Level:
Separately switc able for different tapes.
SWITCH POSITION REC. EQ.
REC. BIAS REC. LEVEL
3 3M250 3M250
406*
456/406*
2
456/641*
641*
1
•Ampex tape
Erasure:
70 dB at 400 Hz, +10 dB reference.
100 Hz-12 kHz, ±4 dB at 15 in/s.
100 Hz-8 kHz, ±4 dB at 7-1/2 in/s
Headp one output:
1-4
AMPEX 4890410-02
10K o ms minimum load, unbalanced, standard 3-conductor
stereo p one jack = 0.8 volt ±2 dB.
Sync ronous Reproduce
signal-to-noise (overall "A" weig ted)
Signal-to-Noise ratio (overall,
"A" weig ted):
Frequency response for sync ronous
reproduce:
Distortion (THD), maximum
(using 456 tape)
Record/reproduce frequency
response:
NAB equalization referred to 6 dB above 185 nWb/m.
1/4 track = 40 dB.
2 track = 45 dB.
NAB equalization referred to 6 dB above 185 nWb/m.
1/4 track = 55 dB.
2 track = 60 dB.
IEC equalization referred to 320 nWb/m.
2 track = 58 dB.
[185 nWb/m (0 dB)]
641*
(+6 dB)
456*/3M250
(+3 dB)
406*
NAB equalization, 15 in/s.
0.3% at 400 Hz, 185 nWb/m.
4.0% at 15 dB above 185 nWb/m.
40 Hz to 100 Hz ±3 dB and
100 Hz to 18 kHz ±2 dB
7-1/2 in/s: 40 Hz to 100 Hz +3, -2 dB and
100 Hz to 15 kHz ±2 dB.
3-3/4 in/s: 40 Hz to 7.5 kHz, +2 dB.

Table 1-2. ATR-700 Specifications (Continued)
Electronics (Continued):
Record level calibration, 0 vu =:
Dimensions:
Approximately 62 lbs (28 kg).
Weig t:
Power requirements:
Environmental:
+5°C (+41°F) to 40°Cj(+104°F).
Operating temperature:
80% maximum, non-condensing.
Operating umidity:
All performance tests made wit Ampex No. 456 (Grand Master) tape.
Table 1-3. Accessories and Options wit Ampex Part Number
STANDARD EQUIPMENT OPTIONS
1
1-5
AMPEX 4890410-02
0 dB referenced to 185 nWb/m of tape flux.
Position 1 — 0 dB.
Position 2 — +3 dB.
Position 3 — +6 dB.
21-5/8 inc es (54.8 cm) ig X 17-3/8 inc es
(44.0 cm) wide X 10-1/6 inc es (25.4 cm) deep
Portable case. Part No. 4010286
Transport remote control. Part No. 4010269
Auxiliary Head Kit, Part No. 1418947-01
(1/4-Track Head) or 1418947-02 (2-Track Head)
2 NAB reel olddown knobs, Part No. 809-137
3- to 2-pin AC power adapter, Part No. 809-134
Rack-mount adapter wit ardware,
Part No. 809-135
1 Accessory mating connector (unwired)
Part No. 809-326
4 Cannon XLR connectors (unwired)
2 Input, Part No. 145-009
2 Output, Part No. 143-125
10-1/2 inc takeup reel (Ampex aluminum
NAB: Part No. 4690003-01)
1 Operation and Maintenance manual
Catalog No. 4890410
Module extender board. Part No. 809-193
100/120/220/240V ±10% 50/60 Hz switc able 150. watts.

Figure 1-1. ATR-700 External Dimensions
1-6
AMPEX 4890410-02

SECTION 2
INSTALLATION
UNPACKING AND INSPECTION
2-1.
INSTALLATION SITE
2-2.
2-1
AMPEX 4890410-02
T e ATR-700 is s ipped from t e factory in a
specially designed, double packing carton to pre 
vent damage in transit. During unpacking, exercise
care to avoid damage to t e carton or accessories.
After opening t e inner carton (see Figure 2-1),
remove rack mounting adapters and box containing
empty reel from t e top of t e ATR-700. Wit
side packing panels still in place, lift t e recorder/
reproducer deck from t e box.
Remove accessories w ic are located at t e bot 
tom of t e box.
T e ATR-700 can be operated in an uprig t
(vertical) position, standing on t e factory-installed
feet (see Figure 2-2); on its back in a orizontal
position; or mounted in a standard 19-inc rack
using t e supplied rack adapters (see Rack Mount 
ing procedure, paragrap 2-3). T e recorder/
reproducer operates on ac line power and must
be wit in approximately six feet of an appropriate
power source. A 3-pin ac cord wit 2-pin adapter
is supplied.
CAUTION
THE ATR-700 WEIGHS APPROXIMATELY
62 LB (28 KG). USE PROPER LIFTING
PROCEDURE.
T e ATR-700 may be operated in most areas,
but to ensure protection of tapes, prolong useful
operating life, and maintain reliable performance,
t e following environmental limitations s ould
be observed:
CAUTION
MAKE SURE THAT THE ACTUAL INPUT
VOLTAGE AND FREQUENCY FROM THE
POWER SOURCE MATCHES THAT SPECI 
FIED ON THE LABEL AFFIXED TO THE
ATR-700. IF IT DOES NOT MATCH, REFER
TO VOLTAGE AND FREQUENCY CONVER 
SION PROCEDURES BELOW.
Avoid extreme line voltage fluctuation. Line
voltage fluctuations must be no more t an
±10% of t e power requirement. If line
As wit any precision mac ine wit moving
parts, t e ATR-700 s ould be covered w en
not in use. Excessive dust may result in
bearing or tape ead wear.
T is section of t e manual provides information
on unpacking, site selection, rack mounting, power
and frequency conversions, initial connections,
and verification procedure prior to operation of
t e ATR-700.
Avoid ig umidity and salt air. Excessive
umidity can s orten equipment life due to
corrosion- or possible fungus growt on
printed wiring assemblies (PWAs). W en
near t e ocean, covering t e recorder/repro-
ducer immediately after use s ould prevent
salt air from corroding metal surfaces, suc
as bearings and internal connections.
Nominal temperature range s ould be 5° C
to 30° C (41° F to 86° F). Direct sunlig t
or close proximity to eating devices will
raise t e internal temperature of t e recorder/
reproducer, w ic may cause damage to some
components. Low temperatures may cause
lubricants to t icken, w ic may result in
sluggis operation and place an overload on
t e drive motor mec anism.

Figure 2-1. Unpacking t e ATR-700
2-2
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T1
Figure 2-2. ATR-700 in Uprig t Position
AMPEX 4890410 02
2-3