Ampex AG 440B AG 445B OP Maintenance

Page 1

AMPEX

4890301-03

AIS-44

Recorded Reproducer

Operation and Maintenance Manual

C) BIAS-4458

ISSUED: FEBRUARY 1969
CHANGED: AUGUST 1971

Page 2

llST OF PAGES
PAGE CHANGE IN PAGE CHANGE IN PAGE CHANGE IN PAGE CHANGE IN
NUMBER EFFECT , UMBE EFFECT UMBE " EFFECT NUMBE 2 EFFECT
Title 8/71 6-43 8/71
"A" 8/71 6-40 8/71
6-4D 8/71
1- xvi 1/70 6-4E/F 8/71
6-5 8/71
Section 1 6-6 8/71
8 pages 6-7 8/71
6-8 8/71
Section 2 6-10 8/71
8 pages 6-11 8/71
6-12 8/71
2-5/6 1/70 6-13 1/70
2-7/8 1/70 6-14 8/71
6-15 8/71
Section 3 6-16 8/71
6 pages 6-17 8/71
6-18 8/71
Section 4 6-19 8/71
54 pages 6-20 8/71
6-21 8/71
4A-1 8/71 6-22 1/70
43-5 1/70 6-23 8/71
4B-8 1/70 6-24 1/70
4B-9/10 1/70 6-25 8/71
40-1 8/71 6-26 1/70
40-2 1/70 |6-27 8/71
4c-3 8/71 '6-27A/B 8/71
40-4 8/71 6-28- 1/70
4C-5 8/71 6-29 8/71
40-11 1/70 6-30 8/71
4C-12 1/70 6-31 1/70
4E-2 8/71 6-32 8/71
4E-3 8/71 6-33 1/70
4E-4 8/71 6-34 8/71
4F-1 1/70 6-35 8/71
4F-2 1/70 6-86 8/71
6-37 8/71
Section 5 6-38 8/71
9 pages 6-39 8/71
6-40 8/71
Section G 6-41 8/71
45 pages
Section '7
6-1 8/71 16 pages
6-2 8/71
6-3 8/71 7B-1 8/71
6-4 8/71 7B-2 8/71
6-411 8/71 73-13 8/71
NOTE: For listing of separable components and accessories, ISSUE: August 1971

see pages 6-2, 6-3. 6-4, and 1-5.

A

Page 10

4890301

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Drive Motor. . . . .
Lubrication .
Fan and Flywheel Replacement.
Drive Motor Replacement.

Motor Capacitor Replacement . . . .

Reel Idler
Tape Guide Replacement
Pulley Replacement.
Idler Tension Adjustment .
Arm Assembly Replacement .
Reel Idler Replacement .
Ball Bearing Replacement .
Takeup Tension Arm .
Arm Spring Adjustment.
Safety Switch Adjustment .
Tape Guide and Hook Replacement A
Tension Spring Replacement.
Takeup Tension Arm Replacement .
Capstan Idler . ,
Lubrication and Adjustment .
Parts Not Removable .
Idler Positioning.
Idler Replacement . . .
Capstan Solenoid Replacement.
Tape Lifter
Adjustment Procedure
Solenoid Replacement
Tape Lifter Replacement .
Safety Switch . .
Servicing Procedures
General.

Control Box Bottom Cover Removal .

Control Box Removal .
Power Checks .

Relay Actuation Check
Solenoid Actuation Check
Drive Motor Check .
Takeup Motor Check .
Rewind Motor Check .
Power Lamp Replacement .
Switch Replacement
Record Circuit Check.

PART F. ELECTRONIC CORRECTIVE MAINTENANCE

General . .

Extender Boards Use. .
Input Power and Indicators Check .
Recorder/Reproducer.

Reproducer (only)
Record Relay Check .
Power Supply Check .
Bias Check

AMPEX

JAN.

4E -5
4E -5
4E -5
4E -5
413 -5
4E -5
4E -5
4E -5
4E -6
4E -6
4E -6
4E -6
4E --7
4E «7
4E -7
4E -7
4E -7
4E -7
4E -8
4E -8
4E -8
4E -8
4E -8
415 «8
4E -9
4E -9
413 -9
4E -10
4E -10
4E -10
4E -10
4E -10
4E -11
4E -11
4E -12
4E -12
4E -15
4E -15
4E -16
4E -17
4E -17
4E -17

4F -1
4F -1
4F -1
4F -1
4F -2
4F -2
4F -3
4F -3

1970

Page 36

4890301-01

To enter other modes from the fast-wind-
ing modes, press the STOP pushbutton, thenwhen
tape motion stops, actuate the control for the
mode selected.

CAUTION

Allow fast-winding tape motion
to stop before pressing the
PLAY pushbutton to avoid break-
ing or stretching the tape.

Two automatic tape-lifter arms (removing
tape from head contact) are automatically actu-
ated in both fast-winding modes. For fast-Wind-
ing audio monitoring, the EDIT pushbutton is then
pressed (this overrides the tape lifter). When
inanual override is desired, open the head gate
and push the head-lifter post back.

3. 6 EDITING

The three edit modes available are stop/
edit, play/edit, and fast-winding edit.

The stop/edit mode can be initiated, with
the tape stationary, by pressing the EDIT push-
button. If the tape isn't threaded, the takeup-
tension arm must be held away from the safety
switch to reduce turntable braking force, so the
reels can be easily rotated by hand. The stop/
edit function facilitates manual cueing and
threading of the tape. To end the stop/edit mode,
press the STOP pushbutton.

The play/edit mode can be initiated from
the reproduce mode by pressing the EDIT push-
button. The tape continues in motion (speed con-

trolled by the capstan) but the takeup turntable
' stops and the tape spills of! the transport right
Side This mode is used mainly to cut out un-
wanted tape.

Fast-winding/edit is entered by pushing
the EDIT pushbutton when in the fast forward or
rewind mode. This over-rides the tape lifter so
audio monitoring is possible. This mode is pri-
marily for quickly reaching a desired tape area
(for rough cueing) .

3-6 AMPEX

Page 37

4 . 1 INTRODUCTION

This section is divided into the follow-
ing six parts; and all data numbering includes
the part designation as the second digit:

Conversion

Routine Maintenance
Adjustment/Alignment
Head Maintenance
Transport Maintenance
Electronics Maintenance

FFPPF?

4. 2 CONTENTS

Part A, CONVERSION, contains pro-
cedures such as repositioning turntables (for the
large CCIR reels), converting to another tape
width, adding optional accessories (such as the
second tape scrape-flutter idler. and the console

4890301-01

Section l

MAINTENANCE
FOREWORD

Part B, PREVENTIVE MAINTENANCE
including cleaning, demagnetizing, lubricating,
and overall performance checkout.

Part C, ADJUSTMENT/A LIGNMENT,
contains normal mechanical/electronic adjust-
ment and adjustment procedures to correct faults
indicated by the overall performance checks.

Parts D, E, and F contain corrective
maintenance procedures for the magnetic heads,
tape transport, and electronic assemblies res-
pectively.

NOTE: Refer to the Table of Contents and Index
Lists to find specific information.

rear covers), adding more channels, and convert-
ing from a reproducer to a recorder-reproducer.

AMPEX 4'1

Page 41

4890301 --01

Step 3: Replace the top cover and
mount the record/reproduce units. Secure each
assembly to the supports with two 12-24 x 3/4
oval-head Phillips screws, and two white nylon
cup-washers .

Step 4: Connect the record/ reproduce
units to the tape transport according to para-
graphs 2. 4 through 2. 7.

1f the console is equipped with optional
rear covers, individual covers (Catalog No.
4040984) should be ordered for each additional
record/reproduce unit.

4A. 4. 3 Reproduce Module Installation

When adding a reproduce module to a sys-
tem, an equalizer circuit board is also required.
Catalog numbers of the equalizers and the mod-
ule are given in the first tables of Section 6. The
reproducer tray holds up to four modules, and
may be rack-mounted or console mounted. In-
stall the module as follows:

Step 1: Remove the plug-in reproduce
board from the chassis.
Step 2: Remove the front cover of the
reproducer tray.

Step 3: Slide the chassis into position
in the tray, and secure it with three No. 6 self-
tapping screws inserted up through the bottom of
the tray.

Step 4: Mate the equalizer connector
to the receptacle at the front of the reproduce
board.

Step 5: Slide the reproduce board into
the chassis on the guides until it mates with its
receptacle.

Step 6: Connect the reproduce module
to the tape transport according to paragraphs 2. 4
through 2. 7.

4A. 5 CONSOLE REAR COVER INSTALLATION

The optional rear covers (see Table 1-2)
are attached to the uprights by captive, spring-
loaded, thumbscrews mating with threaded holes
in the uprights.

4A. 6 RECORD AND REPRODUCE CONVERSION

To convert between reproducer and record/
reproduce units: 1) change the circuit board in the
electronics power supply (record/ reproduce equip-
ment uses a card containing a power supply and a
bias oscillator; the bias oscillator is omitted on
the reproducer board), 2) change the head assem-
bly and head cable box per paragraphs 4A. 2.3
and 4A. 2. 4, and 3) add the electronic unit(s) per
paragraph 4A. 4.

NOTE

Catalog numbers of the power
supply boards, heads, head

cable box assemblies, and the
electronics units are included
in the first tables of Section 6.

AM PEX

Page 59

SET AT
OUTPUT TAPE VTVM
STRAPPING SPEED INDICATION:

+8 6311: 15 ips +8 dBm
7-1/2 ips -2 dBm

3-3/4 ips -2 dBm
+4 dBm 15 ips +4 (132::
7-1/2 ips -6 dBm
3-3/4 ips -6 dBm

Table 40-5. Reproduce Equalization Output

Step 5: Connect vtvm to OUTPUT
connector of the channel under test.

Step 6: Thread correct-speed test

tape on transport .

Step 7: Start test tape in motion in the
reproduce mode. As the first tone reproduces,
adjust REPRODUCE LEVEL control for the output
level indication shown on Table 40-5. Lock the
control in that position.

Step 8: Reproduce the test tone series
from the recorded test tape, starting with the
highest frequencies. Adjust the appropriate
HIGH FREQ control (at the front of reproduce
board) as necessary for the flattest possible res-
ponse, within specifications, but do not move res-
ponse more than i2 dB from the theoretical res-
ponse curve (refer to Figs. 6-32, 6-33, and to
paragraph 4F. 10). If further adjustment is indic-
ated, there is trouble in the record/reproduce

process not correctable by equalization adjustment.

NOTE

The test tape is recorded full
track. When reproduced by a
half-track or multi-track head,
the "fringing" efiect produces
invalid response at frequencies
below 700 Hz (15 and 7-1/2 ips)
or 500 Hz (3-3/4 ips). This
efiect, which results in high
indications in the lower frequen-
ciES, does not occur when tapes
are recorded and reproduced

AM PEX

4890301-01

mm
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[mm ml

Fig. 40-6. Head Azimuth Adjustments

with heads mounted in the
same configuration

Step 9: For tests at 7-1/2 or 3-3/4
ips tape speed, as the last tone reproduced, ad-
just the REPRODUCE LEVEL control for a Vtvm
indication of +8 dBm, or +4 dBm (depending on
equipment strapping). The VU meter should in-
dicate 0 (iii/4 dB).

NOTE

This completes the reproduce
equalization adjustment and
reproduce level setting, as
required for record calibra-
tion. Donot cha_nge this
reference level until after

Step 18 .

Step 10: Wind the test tape on its orig-
inal reel, in the reproduce mode (per paragraph
40. 3. 1), and remove the reel.

Step 11: Connect the signal generator
to the INPUT connector, with the vtvm still con-
nected to the output.

Step 12: Set the signal generator to
provide a nominal I'volt rms output at the fre-
quency that applies: at 15 ips, 1,000 Hz; at
7-1/2ips, 500 Hz; or at 3-3/4 ips, 250 Hz.

Step 13: Thread blank tape on transport.
Set OUTPUT SELECTOR switch to BIAS, and RE-
CORD SELECTOR switch to READY. Start the tape
in motion, with the test channel operating in the
record mode.

40 -9

Page 83

4890301-01

start, check deacwation of the edit relay per
paragraph 4132. 11.5; if it fails to deactnate, re-
move the bottom cover and, with an ohmmeter,
check the opening and closing of the edit switch.
If the edit relay deactuates, check the safety
switch actuation per paragraph 4E. 7. 2 (even
when the safety switch is correctly adjusted,some
trouble could remain in the takeup motor circuit).

(b) If the capstan idler doesn't clamp
the tape to the capstan, check that the dummy
plug (or a remote control unit) is plugged intothe
control box remote-control receptacle. Check
that the jumpers in the dummy plug are sound.
Check that the rewind motor applies holdback ten-
sion on the tape; if not, check the play relay ac-
tuation and contacts per paragraph 4E.11.5.

(c) If the capstan idler clamps the tape,
and the takeup motor starts, but a loose tape loop
allows the takeup tension arm to actuate the safety
switch (stopping all operations), check the takeup
and rewind tape tensions per paragraph 40. 2. 3.
Then check the spring force on the takeup tension
arm per paragraph 4E. 7. 1.

(d) If the capstan correctly clampsthe
tape, but the takeup motor fails to start, there is
probably a malfunction in the motor circuit.
Initiate the fast-forward mode; if the mobr op-
erates normally, the motor and capacitor are

sound and the brake solenoid energizes correctly.

Check the fast-forward relay deactuation and con-
tacts per paragraph 4E.11.5. Check contacts and
continuity of the takeup tension-adjust resistor
R605 (at the basket the control box). Malfunction
of the play and edit relays can cause other mal-
functions covered in the preceding paragraphs of
this section.

(e) If the motor falls to operate in
either play or fast forward modes, check the
takeup reel switch; it it is set at the small hub
position change it to the large hub position. If
this eliminates the trouble, check the small-hub
tension-adjust resistor R606 (on the back of the
control box) per paragraph 40. 2.3. If the trouble
isn't eliminated, or if the switch was originally
in the large hub position, visually check actuation
of the main brake solenoid. If it fails to actuate,
check it per paragraph 4E.11.6.4. If it actuates,
disconnect the takeup motor cable from the con-
trol box. Remove any tape threaded on the equip-

4E -16

ment, and hold the takeup tension arm away from
the safety switch. Press the fast forward push-
button, and use an ac vtvm to check voltage a-
cross motor receptacle pins 1 and 2, full line
power should be present; if not, check wiring
continuity to both sides of the ac line. Remove
the dust caps from the play and fast-forward re-
lays, and check the high side of the line. Man-
ually actuate the fast forward relay; resistance
should be zero, or near zero (reel switch inlarge-
hub position). Release the fast forward relay,
and manually actuate the play relay. The resis-
tance should be that set at takeup tension-adjust
resistor R605.

(1) If motor voltage is present, check
the motor capacitor connections at the solderless
connectors (see Fig. 6-12), then check the cap-
acitor. If it is open or shorted, replace it per
paragraph 4E.4.9. If voltage is present and the
capacitor is sound, the takeup motor is probably
defective. Check the motor per paragraphs
4E.4.2 and 4E.4.5. Motor cabling connections
are shown on Fig. 6-12.

4E.11.9 Rewind Motor Check

If the power lamp doesn't light when
power is ON, check power per paragraph
4E.11.4.2. If the capstan drive motor doesn't
operate when tape is threaded, check the motor
per 4E. 11. 7. If the takeup motor doesnt operate,
check it per paragraph 4E. 11.8.

(a) If the rewind mode fails to function,
remove the tape from the transport. Hold the
takeup tension arm away from the safety switch
and initiate the play mode. The rewind turntable
should rotate clockwise, the takeup turntable
should rotate counterclockwise, and the capstan
idler should contact the capstan. If operation is
correct, press the rewind pushbutton. If this
doesn't stop the play mode (capstan idler moves
away from capstan) check rewind relay actuation
and contacts per paragraph 4E.11.4. 1f the play
mode drops out, the rewind relay is actuating
correctly.

(b) If only the takeup motor operates,
check the supply reel switch. If it is in the small-
hub position, move it to the large-hub position.

If the rewind motor now operates, check small-
hub tension-adjust resistor R608 per paragraph

AM PEX

Page 103

489030 1

TYPE AND DASH NUMBER
Two-Track Heads

MODEL AG-44013, DUAL-CHANNEL
TAPE RECORDER/REPRODUCER

E; 2 j 2 fi fi Ampex 4010132 (Ref. D)
a :3 o 0 I34 A :z: a: a :1: :I: a:
N N u a N u o a o o o c * CODE: C-Caaed (Page 1 of 2)
:1: :I: :c: m a: :I: o m e In a: u: p_Pmle
3 3 S S S 3 1L" 1". 1:3 1? 7. it U-chased
I I l
$ 5. 2. $ $ 35 i i i g i 3,
IL 1- 23' 11 11 1 a: v: a: m a: o:
o H N
7% $ $ $ $ $ 5 3i g. 1 7 7
Quantity Required Per Dash Number DESCRIPTION :13?)
1 1 1 1 Console Assy 4020084-07
2 2 2 2 2 2 2 2 2 Z 2 Electronics Assy, Without Equalizers 4020260-10
2 2 2 2 2 2 Equnlizet Assy, Record 'Ié-ls NAB 4020269-01
2 2 2 2 2 2 Equalizer Assy, Record 3 3/4-7% NAB 4020269-02
2 2 2 2 2 2 2 2 2 2 2 2 Equalizer Asay, Reproduce NAB 4020270-01
1 1 1 Transport Assy, 71-15 60 Hz 4020271-09
1 1 1 Transport Assy, 7i-15 50 Hz 4020271-10
1 1 1 Transport Assy, 3 3/44; 60 Hz 4020271-11
1 1 1 Transport Assy, 3 3/441 50 Hz 4020271-12
1 1 1 1 1 1 1 1 l 1 1 1 Head Assembly, Two-Track 4020272-02
l 1 1 1 1 1 1 1 1 1 1 1 Power Supply Aasy 4020274-03
2 2 2 2 Knob Assy, Editing 4030145-10
2 2 2 2 2 2 2 2 Knob Assy, Real 4040492-10
1 1 1 1 1 1 1 1 1 1 1 1 Scrape Flutter Idler Assy 4040955-01
1 1 1 1 1 1 1 1 1 1 1 1 Cable Assy, Power 405041642
2 2 2 2 2 2 2 2 2 2 2 2 Cable Assy, Electronics Interconnect 4050442411
1 1 1 1 1 1 1 1 1 1 1 1 Box Aasy, Hand Cable Mounting 4050447-07
2 2 2 2 2 2 2 2 2 2 2 2 Knob, Reel Holddown 4100137-10
1 1 1 1 Case Assy, Transport 4150329-01
1 1 1 1 Case Assy, Single & Dual Elect. 7" 4150830-02
1 1 1 1 Shield, Resistor (Control Box) 4290648-01
1 1 1 1 1 1 1 1 Shield, Resistor (Control Box, Uncased KI Parable) 4290659-01
2 2 2 2 2 2 2 2 2 2 2 2 Transformer, lnput-Brldging 4550200-01
2 2 2 2 2 2 2 2 2 2 2 2 Shield, P/B Head Connector 4600008-10
1 1 1 1 1 1 1 1 1 1 1 1 Reel Assy 4890003-10
1 1 1 1 1 1 1 1 1 1 1 1 Instruction Manual 4890801
1 1 1 1 1 1 1 1 1 1 1 1 Numrlver, Modified 4980504431
2 2 2 2 2 2 2 2 2 2 2 2 Connector, Plug, female, 3-131]! 144-003
2 2 2 2 2 2 Z 2 Z 2 2 2 Connector, Plug, male, 3-p1n 145-009
6-4 AM PEX AUG. 1971

Page 108

MODEL AG-MOB, TAPE TRANSPORT
Ampex 4010123 (1m. D)

4890301
TYPE AND
DASH NO.
5? £
a a 3 8
a N m
a 8 \ \
u: m '1 'u
H H p p
1 I u I
a Q i t
H H n a?
I l :
1~ p n n
°°. $ 3 '1
ty eq Per Ampex
Dash Number DESCRIPTION Part No.
1 1 1 1 Idler Assembly, Scrape Flutter 4040955-01
1 1 1 1 Shleld, Resstor, Control Box 4290859-01
1 1 1 1 Screw, #8-82 x 1, Pan Head, Cross-Recessed 471-084
1 1 1 1 Washer, #8, Flat 501-010
1 1 1 1 Lockwashet, #8. Spring 502-004
2 2 2 2 Nut, 498-32, Keps 496-006
1 1 1 1 Jiffy Bag, #1, 14 x 20 718-022
1 1 1 1 cable Assembly, Power 4050416-02
1 1 1 1 Packaging Assembly 1206811-01
1 Tape Trans-port Assembly, 7-1/2 - 15 60 Hz 4020271-18
1 Tape Transport Assembly, 7-1/2 - 15 50 Hz 402027144
1 Tape Transport Assembly, 3-3/4 - 7-1/2 so Hz 402027145
1 Tape Transport Assembly, 3-3/4 - 7-1/2 50 Hz 4020271-16
Ave. 1971 AM PE X 64E/F

Page 135

REWIND ASSEMBLY
40302980
(See Fig. 6-13)

Ampex Part
Item -01 ~02 -03 DESCRIPTION No,
X Rewind assembly 4030295-01
X Rewind assembly 4030298-02
Rewind assembly 4030298-03
1 1 1 1 Brake assembly (see Fig. 6-14) 4030264-04
2 1 Motor assembly (G. E.) 4040768-01
29 1 Motor assembly (Takanawa) 4040768-07
3 1 1 1 Pad, turntable 4130163-02
4 1 1 1 Drive Plate 4320128-10
7 1 1 1 Connector, plug, 8 pins, male 145-013
8 12 12 12 Solderless connectors 171-008
29 1 Motor Assembly (Ashland) 4040768-03

Items of standard hardware, wire, etc. .
not listed

AMPEX

401590C AUG. 1971