Ampex MM 1100 Operation Maintenance

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TABLE OF CONTENTS

Page

DESCRIPTION .........................
GENERAL .........................

TAPE TRANSPORT ASSEMBLY ..............
SUPPLY AND TAKEUP REEL ASSEMBLIES.
CAPSTAN DRIyE ASSEMBLY. .
CAPSTANPINCHROLLER. .. ............
TENSION SENSOR ASSEMBLY . . . . . . . . ......
END-OF-TAPE ARM . .' ...............
TAPE LIFTER ASSEMBLY . . . . . .
TAPE TIMER ASSEMBLY (OPTIONAL) .

TRANSPORT CONTROL ASSEMBLY ..............
r MOTOR DRIVE AMPLIFIER ASSEMBLY ........ . .
3 HEAD ASSEMBLY ........................
I ELECTRONICS ASSEMBLIES ....................
1 CONTROL Box ASSEMBLY ...................

\ METER PANEL ASSEMBLY ...... . . . .

, POWERSUPPLIES...

I SPECIFICATIONS. . . . . . . . . . . . .....

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_|NSTALLATION...........................11
,EQUIPMENTSITING.......................11

UNPACKING ........................... 11
POWER REQUIREMENTS ............. . . . . . . . 11
CABLE CONNECTIONS ............... '.. . . . . . 12
OPERATION ........................... . . 13
. CONTROLS AND INDICATORS ................... 13
OPERATING PROCEDURES .................... 17

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Figure 7. System Control Box, Controls and Indicators

Table 2. System Control Box, Controls and Indicators

- FIG. 7
INDEX NO. NAME FUNCTION
1 READY/SAFE rocker Permit channel selection for recording. In READY,
switches enable recording on the corresponding channel. In
SAFE, no recording is permitted on the corres-
ponding channel.
2 SEL SYNC/REPRO In SEL SYNC, causes all channels to reproduce
rocker switch from the record heads.
In REPRO, causes all channels to reproduce from
the reproduce heads. (Sel Sync operation is
described later in this section.)
3 INPUT MON/NORMAL In INPUT MON, causes the audio input to beam-

MON rocker switch

nected directly to the audio output of those

channels with their READY/SAFE switches set to
READY. In NORMAL MON, causes all audio outputs
to be derived from off-tape only.

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10. Perform the bias trap adjustment as follows:

Place the SE'L SYNC/REPRO switch in .SEL SYNC. Place the .INPUT
MON/NORMAL MON switch in NORMAL MON.

Place READY/SAFE switches of channels adjacent to channel to beset in
REAQY position; set switch of channel to beset in SAFE :position.

Helmoye tape from-machine and hold the end'of-tape arm in on position with
an elastic band or pressure-sensitive tape.

x

.' With system power off, mount the record electronics card of the channel to be

set on an extender card.
Connect a 'vtvm to the channel line output, switch system-power'on,-and place
machine in record mode. , 7

Adjust the bias trap inductor for minimum reading .on the vtvrn. (The bias trap
inductor is accessible with a long, insulated-core turning tool; it is on the
switching card at the rear of the card cage in line with the ektended record
card.)

OVERALL NOISE AND DISTORTION MEASUREMENTS

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A wave analyzer is recommended for making distortion measurements,.and is necessary for
making erasure depth measurements. An oscillator with less than: 0.1%. distortion is also
required for making distortion measurements. Correct record and-reprodmealignment" is
assumed.

Distortion Measurement

1. Set up the system for distortion measurement as follows:

Thread a reel of degaussed tape of the type to be used (Ampex 406 or
equivalent) onto the transport.

Place all READY/SAFE switches to READY.
Select NORMAL MON and REPRO settings.

Connect an oscillator to the line inputs. Adjust oscillator frequency to '1 kHz
and level to +4 dBm.

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