Ampex MR 70 OP Maintenance

Page 1

I'iiii~i\

MFR-7C)

Recorder/Reproduce

Publication No. 489014540
January 1965

AMPEX CORPORATION
40] Broadway
Redwood City. California

Printed in U.S.A.

Page 2

llST OF EFFECTIVE PAGES
PAGE ISSUE IN PAGE ISSUE IN PAGE ISSUE IN PAGE ISSUE IN

NUMBER EFFECT [[NUMBER EFFECT NUMBER EFFECT NUMBER EFFECT 2
401084 A 1/65 401203 A 1/65 401040 A 1/65 401083 A 1/65
401085 A 1/65 401204 A 1/65 401041 A 1/65
401086 A 1/65 401205 A 1/65 401042 A 1/65
401087 A 1/65 401206 A 1/65 401043 A 1/65
400901-1 A 6/64 401207 A 1/65 401044 A 1/65
401182 A 1/65 401208 A 1/65 401045 A 1/65
401183 A 1/65 401209 A 1/65 401046 A 1/65
401184 A 1/65 401210 A 1/65 401047 A 1/65
401185 A 1/65 401211 A 1/65 401048 A 1/65
401186 A 1/65 401212 A 1/65 401049 A 1/65
400901-2 A 6/64 401313 A 1/65 401050 A 1/65
400922 A 1/65 401214 A 1/65 401051 A 1/65
400924 A 1/65 401215 A 1/65 401052 A 1/65
400926 A 1/65 400902-2 A 6/64 401053 A 1/65
400928 A 1/65 401216 A 1/65 401054 A 1/65
401006 A 1/65 401217 A 1/65 401055 A 1/65
401007 A 1/65 400904-3 A 6/64 401056 A 1/65
401008 A 1/65 400881 A 8/64 401057 A 1/65
400901-3 A 6/64 401015 A 1/65 401058 A 1/65
401009 A 1/65 401016 A 1/65 401059 A 1/65
401010 A 1/65 401017 A 1/65 401060 A 1/65
401011 A 1/65 401018 A 1/65 401061 A 1/65
401012 A 1/65 401019 A 1/65 401062 A 1/65
401013 A 1/65 401020 A 1/65 401063 A 1/65
401014 A 1/65 401021 A 1/65 401064 A 1/65
400904-4 A 6/64 401022 A 1/65 401065 A 1/65
401187 A 1/65 401023 A 1/65 401066 A 1/65
401188 A 1/65 401024 A 1/65 401067 A 1/65
401089 A 1/65 401025 A 1/65 401068 A 1/65
401190 A 1/65 401026 A 1/65 401069 A 1/65
401191 A 1/65 401027 A 1/65 401070 A 1/65
401192 A 1/65 401028 A 1/65 401071 A 1/65
401193 A 1/65 401029 A 1/65 401072 A 1/65
401194 A 1/65 401030 A 1/65 401073 A 1/65
401195 A 1/65 401031 A 1/65 401074 A 1/65
401196 A 1/65 401032 A 1/65 401075 A 1/65
401197 A 1/65 401033 A 1/65 401076 A 1/65
401198 A 1/65 401034 A 1/65 401077 A 1/65
401199 A 1/65 401035 A 1/65 401078 A 1/65
401200 A 1/65 401036 A 1/65 401079 A 1/65
401201 A 1/65 401037 A 1/65 401080 A 1/65
400904-1 A 6/64 401038 A 1/65 401081 A 1/65
401202 A 1/65J1401039 A 1/65 401082 A 1/65
A «HIWSA

Page 28

this timing screw so that the test light is illum-
inated just at the point previously described.

If the force and the timing of the tension
control is correct, the holdback tension should be
within tolerances quoted in paragraph 4.1 through-
out the run of a reel of tape.

CAUTION

Do not attempt to adjust
holdback tension by
changing the supply motor
leads to different taps on
the power transformer.
Such action might result in
surpassing the power rating
of the motor.

4.2. 3 Adjusting Takeup Tension

Tskeup tension is dependent on the volt-
age, and thus the torque, supplied to the takeup
motor during the play or record modes. Once the
torque is adjusted at the factory, there should be
no necessity for readjustment unless the motor is
replaced, speed changed, etc. If readjustment is
required, it is accomplished by changing the motor
lead to a different tap on the power transformer.
The normal connections are shown on Fig. 7-2,
note that the "run" lead from the motor can be
changed from its normal tap so that more "run"
voltage is applied (torque and tension increased) or
less is applied (torque and tension decreased). The
transformer is located in the transport control box,
and it is necessary to remove the perforated cover
to gain access to it. Color coding of the leads is
shown on Fig. 7-2. Do not change the "start" lead
to the motor; this provides a starting power boost
for approximately 1/2 second.

4. 2. 4 Amy sting Braking Force

Brake adjustments require that the en-
tire supply or takeup assembly (as applicable) be
removed from the transport. Brakes can be check-
ed and adjusted with the assembly removed. There
are two brake adjustments, one for the "high" brake
force (counterclockwise rotation for supply, clock-
wise for takeup) and the other for the "low" brake
force (see Fig. 4-4). No nuts control the high
side. while one controls the low. Be sure to run
in the two nuts for the high side in equal amounts.
When the adjustment is completed, manually
actuate the brake solenoid and rotate the turntable,

4-6

making sure the mechanical brakes do not bind or
drag.

4.2.5 Ad]1_i sting Capstan Idler Force

This adjustment is made at the capstan
idler solenoid locknut (see Fig. 4-4). Run the nut
in to increase force, out to decrease. When adjust-
ment is completed, put the equipment in the play
mode and check that the solenoid is bottomed (the
idler can be easily pushed away from the capstan if
the solenoid is not bottomed). If not bottomed, run
the locknut out.

Adm sting Takeup Tension Arm

Make this adjustment with the micro-
switch actuating screw on the takeup tension arm
assembly underneath the transport. Run this screw
in or out until the arm is in the proper position
when it actuates the switch.

4.2.6

4. 2. 7 Adjusthg Tag Speed

This adjustment is made by using the
motor solenoid lock nut and a stop screw (see Fig.
4-5). Before starting the adjustment run both the
stop screw and the lock nut out, so that the set
screw does not bottom and the capstan is not driven.
Then run the solenoid lock nut in; speed will first
increase then will slow down below sync speed.
Continue turning the solenoid lock nut until one
spoke on the strobo passes a fixed point every 2-3
seconds. Then run in the stop screw until sync
speed is attained, and set the lock nut on the stop
screw. When the adjustment is completed speed
must be correct and the stop screw must be firm
against the stop when the equipment is in the play
mode.

When using the tape strobe (Dubbings
Electronics) remove the head cover and contact the
tape with the disc between the head assembly and
the capstan. Adjust the speed at the start of a reel
(1/2-inch tape pack on takeup reel). Then check
the speed at the end of the reel (1/2-inch tape pack
left on supply reel). Speed at both points must be
within tolerance, if not, adjust to an optimum speed
which is within tolerance at both points on the reel.

4. 2. 8 Correcting Excess Flutter and Wow

Flutter can be caused by any component
in the transport that affects tape motion. It is
manifestly impossible in this manual, therefore, to
delineate specific causes and remedies.

4m 192A

Page 55

MASTER PARTS LIST
ONE CHANNEL - 1/4 TAPE - CONSOLE MOUNTED

4017011 Amp
(Nil-04 '07 <08 -11 -12 «15 -16 DESCRIPTION P95! E E9] 5!
X RECORDER/REPRODUCER. '75 - 15 ips. 60 cps. adj. heads 4017011-03
X RECORDER/REPRODUCER. 7Q - 15 Ips. 50 cps. adj, hends 4017011-04
X RECORDER/REPRODUCER, 7i - 15 Ips. 60 cps. fixed heads 4017011-07
X RECORDER/REPRODUCER. 7; - 15 Ips. 50 cps. fixed heads 4017011-08
X RECORDER/REPRODUCER. 15 - 30 1115. GD cps. adj. heads 4017011-11
X RECORDER/REPRODUCER. 15 - 30 1115. 50 cps. adj. heads 4017011-12
X RECORDER/REPRODUCER. 15 - 30 ips. 60 cps. fixed heads 4017011-15
X RECORDER/REPRODUCER. 15 - 30 ips. 50 cps, fixed hands 4017011-16
' 1 1 TRANSPORT, Tape: 75 - 15 ips. so cps «120244-01
' 1 1 TRANSPORT. Tape: 7! - 151115. 50 cps 40202444
' 1 1 TRANSPORT. Tape: 15 - 30 Ips. so cps «120244-02
' 1 1 TRANSPORT. Tape: 15 < 30 ips. 50 cps 4020244-04
1 l 1 1 HEAD ASSEMBLY. Adjustable «1020236-02
' l l l 1 HEAD ASSEMBLY, Fixed 4020236-01
' 1 l l 1 1 1 1 1 ELECTRONIC ASSEMBLY 402023341
' l l l l 1 1 1 1 CONSOLE ASSEMBLY 401003-1411
2 2 2 2 2 2 2 2 KNOB. Reel hold-down 4040492-10
2 2 2 2 2 2 2 Z KNOB, Reel hold-down 4100137-10
2 2 2 2 2 Z Z 2 KNOB. Reel editing 4030145-10
1 1 1 1 l l 1 1 CABLE ASSEMBLY. Power 4050368-01
1 1 1 1 1 1 1 1 CABLE ASSEMBLY. Power inlerconnecflng 4050365-01
l 1 1 1 l 1 l 1 CABLE ASSEMBLY. Bias Interconnecung 4050366411
1 1 1 1 1 1 1 1 SHIELD, Playback head connector 450000540
1 l 1 1 1 1 1 1 CONNECTOR. Plug: signal input. Cannon XLR-3-12 145-00!)
1 1 1 1 l 1 1 1 CONNECTOR. Plug: signal output. Cannon xm-a-u 1444103
1 1 1 1 1 1 1 1 REEL ASSEMBLY 4650003-10
I. 1 1 1 1 1 1 1 INSTRUCTION MANUAL 4890145-01

See separate parts list later In this section.

401016A

Page 75

TAPE TRANSPORT ~ 1/2" TAPE

ief . 40 20214 Ampcx
Syn]. -05 >06 -07 418 DESCRIPTION Parl Number
X TAPE TRANSPORT. 7-l/2 - 15 ips. 60 cps 4020244-05
X TAPE TRANSPORT. ' - 30 ips. 50 cps 40202-14-06
X TAPE TRANSPORT. -l/2 - 15 ips. 5U cps 402024-14
X TAPE TRANSPORT, 1.; ~ 30 ips. 50 cps 40202-14415
1 DRIVE MOTOR AND BRACKET ASSEMBLY
1 DRIVE MOTOR AND BRACKET ASSEMBLY
l DRIVE MOTOR AND BRACKET ASSEMBLY 40302043
I DRIVE MOTOR AND BRACKET ASSEMBLY 4011020640
1 MOTOR ASSEMBLY. Drive 4030187-10
1 MOTOR ASSEMBLY. Drive 4030197 20
1 MOTOR ASSEMBLY. Drive 4030197 10
I MOTOR ASSEMBLY. Drive 403010740
1 PULLEY, Drin- moior Not available
1 1 MOTOR. Drive Nm. available
P503 1 1 1 1 CONNECTOR. Plug: male. 6 contact. Jones P-aofi-CCT 145-004
1 1 l l PLATE. Drive motor mounting 4330217-01
4 -l .1 4 SCREW, Machine: flat head, Phillips drive. 10-24 by 1/2 in. lg. 471-734
1 1 1 1 RING, Retaining: external. beveled. Truarc 5102-231-\1D 4110-3
1 1 1 1 MOUNTING BRACKET ASSEMBLY, Drive motor 103020540
1 1 l l BRACKET, Support: motor mounting 4260291340
1 1 1 I BRACKET. Mounting: motor 4260299>10
1 1 1 1 STOP. Drive motor 4220192-10
1 1 1 1 WASHER. Lock: split ring. 1/4 in. " 2<00li
l 1 1 l SHAFT 4210173-10
2 2 2 2 BEARING. Ball: Falnir ARKDD ~12 -083
2 2 2 2 RING. Retaining: internal. ilal. Trunrc NSOOU-EG-S-ZD 430-026
:I/r a/r a/r a/r WASHER, Shim: 0.005 in. thk. 4440113-10
a/r a/r a/r a/r WASHER. Shim: 0.015 in. thk. 4440113-30
2 2 . 2 SCREW, Set: headless. sockei drive. 3-82 by 1/4 in. lg. 477-041
1 1 1 1 BEARING, Ball: Fainir BS46ESI71 421425
4 4 4 4 SCREW. Machine: pan head. Phillips drive. 5-32 by 3/8 in. lg. 471-06!)
4 «l 4 «l NUT. Hex: 6-32 492-009
4 4 -l 4 WASHER. Lock: external tooth. No.6 502-014
1 1 l 1 CAPACITOR ASSEMBLY. Motor 4050336-10
C506 1 1 1 I CAPACITOR. Motor 4540292-30
1 1 1 1 BOOT. Salely: Sprague 301-66 032-082
2 '2 2 2 CONNECTOR. Solderless: slotted ring. Amp 328394 171-360
2 l 2 2 SCREW. Machine: pan head. Phillips drive, 10-24 by 5/8 in. lg. 471-565
2 1 2 2 WASHER. Fiat: No. 10 501-011
2 . 2 3 WASHER, Lock: exiernal tooth, No. 10 502-016
1 1 ACTUATOR ASSEMBLY. Drive molar 4030204-10
1 1 ACTUATOR ASSEMBLY. Drive moior 4030204-20
l 1 1 1 SOLENOID ASSEMBLY 4030202-20
K507 I 1 l l SOLENOID 4590106-10
l l 1 1 BOLT. Eye 44004964.)
1 1 1 1 PlN. Clevls: 1/8 in. dia. by 17/32 in. lg. 400-009
1 1 1 1 PIN. Cotter: 1/16 in. dla. by 1/2 in. 1g. 401-005
I l l 1 WASHER. Felt: 1/2 in. OD by 1/4 in. 1D by I/-l in. Lhk, 503-015
1 1 1 1 STOP. Solenoid 4220139-20
2 2 2 2 SCREW. Machine: pan head. Phillips drive 5-32 by 1/4 in. lg. 471-076
2 2 2 2 WASHER. Lock: external tooth. No.9 502-0521
2 2 2 2 CONNECTOR. Solderlesa: slotted ring. Amp 32339-1 111-360
1 l 1 1 PLATE. Solenoid adapter 433019540
4 4 4 4 SCREW, Machine: flat head. Phillips drive. 5-32 by 1/4 in. lg. 471-343
1 1 STOP, Drive motor 4220196-10
1 1 STOP. Drive motor 4220224-10
l l l l ANCHOR. Molar remrn spring 426029540
2 2 2 2 SCREW. Machine: pan head. Phillips drive, 8-32 b_\ 1/2 in. lg. 471-060
2 2 2 Z WASHER. Flat: No.8 501-911
2 2 2 2 WASHER. Lock: external tooth. No.8 502-015
1 1 1 1 PAD 30150-10
1 1 1 l SCREW. Set: headless. socket drive. 10-32 by 3/4 in. 11;. 477-340
1 l l 1 NUT. Hex: 10-32 492-011
2 2 2 2 SCREW. Machine: pan head. Phillips drive. 10-24 by 5/5 in. lg. 471-865
2 3 '2 2 WASHER, Lock: exlernal tooth. No.10 502-016
1 1 ANGLE. Drive motor acmaicr 4260294-10
l ANGLE, Drive motor actuator 4260311-10
1 ANGLE, Drive molar actuator {260312-10

40 1036A

Page 94

TAPE TRANSPORT . 1" TAPE (CONTINUED)

Ref. 40202-14 Ampex
Sym. -09 -10 -11 -12 DESCRIPTION Part Number
.1503 1 1 1 l CONNECTOR. Receptacle: female. 0 contact, Jones S-3OG-AB 146-004
J504 1 1 1 1 CONNECTOR. Receptacle: male. 3 contact. Hubbeli 75566 147-0512
J505 1 1 1 1 CONNECTOR. Recepxacle: female. 2 contact. Despard 1320 L 1354 140-014
.1506 4 4 4 4 CONNECTOR, Receptacle: female, 8 contact, Jones S-308-AB 140-003
.1507 1 1 1 l CONNECTOR, Receptacle: iemale, 12 contact, Jones S-312-AB 140-009
.1508 1 1 1 1 CONNECTOR. Receptacle: female, 4 contact, Jones S-304-AB 146-005
.1509 l 1 1 1 CONNECTOR. Receptacle: iemaie: 10 conlael. Jones S-310-AB 146-018
.1511 - - - - (Same as .1506) 146-003
.1512 - » - - (Same as .1506) 146-003
.1513 - - - - (Same as .1506) 140-003
K501 2 2 2 2 RELAY. 4 circuit 4590101-20
K502 - - - - (Same as K501) 4590101-20
K503 3 3 3 3 RELAY. 6 circuit 4590101-30
K504 2 2 2 2 RELAY. 2 circuit 4590101-10
K505 - - - - (Same as K503) 4590101-30
K506 - > - - (Same as K503) 4590101-30
K507 - - - - (Same as K504) 4590101-10
L501 1 1 1 1 CHOKE. Filter 4580174-10
P506 1 1 1 1 DUMMY PLUG ASSEMBLY. Capital! motor amplifier 4050138-20
P507 1 1 1 1 DUMMY PLUG ASSENDJLY. Remote control 4050371>01
R501 1 1 1 1 RESISTOR. Variable: 50K ohms 4520145-40
R507 1 1 1 1 RESISTOR, Fixed: composition. 470 ohms, t10i. 2W 041-199
R508 1 1 1 1 RESISTOR, Variable: 5000 ohms 4520150-10
R514 1 1 1 1 RESISTOR. Fixed: composition, 6800 ohms. 110%. 1W 041-156
$508 1 1 1 1 SW1TCH. Line voltage adjust 4620177-10
T501 1 1 1 1 TRANSFORMER. Power 4580179-10

5 5 5 5 HOLDER. Fuse: Littelfusc 342012 085-001

1 1 1 1 KNOB 4100105-02

1 1 l 1 SHIELD. Transformer 4290550-01
DS501 3 8 8 8 LAMP. Incandescent: miniature. bayonet. 24v. 0.07 amp. 6.15. type 1829 060-011
W502 - - - - (Same as D5501) 060-011
05503 - - - - (Same is D6501) 060-011
D5504 - - - (Same as D8501) 060-011
W505 - - - - (Same as D3501) 060-011
06506 - - - - (Same as $501) 060-011
[5507 - - - - (Same as N501) 000-011
$508 - - - - (Same as [3501) 060-011

401055A

Page 101

ELEC TRONICS ASSEMBLY (CONTINUED)

. mpox
DESCRIPTION ..mu_'_nnm_.
1 ETCHED BOARD ASSEMBLY, Power supply {050322-10
C143 1 CAPACITOR, Electrolytic: 20 mm. +100X15C, 50 Vdcw. Sprague 30D2OGGDSODC4
C140 5 CAPACITOR. Mylar: 0.022 m1d. 110}. 400 Vch. Elmenco 4 DPv"-223
C145 1 CAPACITOR. Mynlr: 0.01 mid, $105". 600 vdcw. Elmcnco GDP-2-103
6151 - (Same as C146)
C152 - (Same as C146)
C153 - (Same as C146) 035-753
(315-) - (Same as C146) 035-703
CRIOS 4 DIODE. Crystal: diffused silicon. type 1N2864A 013-339
CRIOG - (Same as CRIOS) 013-339
CR107 - (Same as CR105) 013-339
cmus - (Same as emu-5) 013459
R158 2 RESISTOR. Fixed: composition. 1200 ohms. tIOI, 2W. RCIZGF122K 0-11-2051
R163 >1 RESISTOR. Fixed: composition, 100 ohm, $107.. 1/2W. RC2OGF101K 041-030
R165 - (Same as R1515) 011-203
R166 2 RESISTOR. Fixed: composition, 1200 ohms. :10}. 1/2\\. RC2OGI-122K 041-147
R167 v (Same as R167) 11-11-147
1115!! 1 RESISTOR, leed: composition. 100 ohms. 210}. 1/2 \\. RCU7GF101K 049-333
R169 1 RESISTOR, leed: composition. 560 ohms. £10';. 2W. RC-I2GF561K 041-200
R170 - (Same as R163) 041-035
R171 - (Same as R163) 0-11-03?!
R172 1 RESISTOR, Fixed: composition. 2200 ohms. $1051. 1W. RC32GI-222K 041-150
R173 - (Same as R163) 041-035
R174 2 RESISTOR. Fixed: composition. 2200 ohms, 210}. 1/2\\', RCZUGFJZZK 041-052
R175 - (Same as R174) 041-052
R176 1 RESISTOR. leed: compasltion. 470 ohms. tIOF. 1/2 W. RC20GF-l71K 041-044
1 BACK PANEL ASSEMBLY Not available
1 OUTPUT TERMINAL BOARD ASSEMBLY 4050324-10
11179 1 RESISTOR. leed: composltlon. 560 ohms. :10". 1/2}, RC2DGF551K 041-045
R180 1 RESISTOR. leed: film. 5110 ohms. 11%. 1/2W. [RC type CEC-TO 045-156
R181 1 RESISTOR. Fixed: 111m. 4530 ohms. 11'}. 1/2W. [RC type CBC-TO 048-514
R182 1 RESISTOR, leed: [11111. 2370 ohms. 11%. 1/2 W. IRC type CBC-TO 045-776
R183 1 RESISTOR. Fixed: mm. 8060 ohms. *1CL. 1/2W. IRC typo CEC-TO 048-515
R184 1 RESISTOR. Fixed: composition. 10K ohms, :10. 1/2 w. RCZOGFIOSK 041-060
F101 1 FUSE. Cartridge: 0/4 amp. 2:" v. slaw blow. Buns MDL 3/4 (115 v operation) 070-031
F101 1 FUSE. Cartridge: 3/8 mp. 250 v, slow blow. Buss MDL 3/8 (230 v operation) 070-992
.1101 1 CONNECTOR. Receptacle: female. 3 contacts. Cannon XLR-3-13 146-007
04 3 CONNECTOR. Receptacle: male. 3 contacts. MS3102A1095L-3P 143-000
.1105 - (Same as .1104) 143-001!
.1107 1 CONNECTOR. Receptacle: male. 1 contact, MS3102A105-21 143-010
J109 1 CONNECTOR, Receptacle: male. 2 contacts, MSHIOZAIOSL-AP 143-009
3110 - (Same as .1104) 143-0024
.1111 1 CONNECTOR. Receptacle: female, 10 contacts. Jones 8410-1113 146-018
.1112 1 CONNECTOR. Receptacle: male, 8 contacts, Jones P-308-AB 147-006
.1114 l. CONNECTOR, Receptacle: male, 3 contacts, Cannon XLR-3-14 147-004
K102 1 RELAY 4590101-30
R129 1 RESISTOR. leed: composluon. 100K ohms. £1023. l/ZW. RCZOGI-IIMK 041-072
TP101 2 CONNECTOR. Jack: up. red. H.H. Sl'nlth 20511531) 146-380
TPlOl 2 CONNECTOR, Jack: tip. black. 11. H. Smith ZUSBMCK 146-385
TI102 - (Same as final) 146-386
TP102 - (Same as TP101) 140-385
1 HOLDER. Fuse: thteuuse 342012 0255-001
C101 1 CAPACITOR. Electrnlytlc: 4 mld, 450 Vch, Sprngue type DEE 031-009
C102 3 CAPACITOR. Electrolytic: 110~20v20~20 mld. 450 vdew 4550144-10
C110 - (Same as C102) 4550144-10
C149 1 CAPACITOR, Electrolytic: 2000-1000 mId. 15 \'dcw 4550067-10
C150 - (Same as C102) 4550144-10
CR103 2 DIODE. Crystal: diffused silicon. type 1N007 5824)
CR10-l - (Same as CR103) 582-061
.1102 2 SOCKET. Tube: Octal. Cinch 9905 150-023
J103 :1 RECEPTACLE. Connector: female. 15 contacts. Cannnn DA»155 140-020
.1100 - (Same as .1103) 140-020
JIOS - (Same as .1102) 150-023
.1113 - (Same as .1103) 140-020
101 1 RELAY. 24 vdc: Automatic Electric IE-5011-812 0204171
L103 1 CHOKE. Filament 4580114-10
L104 1 CHOKE, Fllter 4500170-10
P102 1 DUMMY PLUG ASSEMBLY 4030034-10

401002A