Ampex 351 - Page 27

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Tape Threading Path
4-4
Speed Switches
There are two switches associated with oper 
ating speed. The tape speed switch S503 deter 
mines the speed of the capstan drive motor,
and the equalization switch 4S2 changes the
equalization in the amplifiers appropriately.
Power
Power is supplied through power switch 4S5,
which must be turned on to operate the elec 
tronic and mechanical assemblies. The me 
chanical assembly and electronic assembly are
individually fused by the 3 ampere control
circuit fuse 5F2 and the ¥2 ampere electronic
fuse 5F1.
Editing and Cueing
Indexing the tape as in editing or cueing, or
when approaching the end of the reel, is simpli 
fied by holding down a combination of buttons.
Tape motion can be reduced by holding down
the fast forward and rewind buttons simultan 
eously, and then alternating between the two
to control tape direction. When the desired
point is reached, the STOP button must be held
down until the fast forward and rewind but 
tons are released.
NOTE
In using either the fast forward or
rewind mode, it is desirable to remove
the tape from direct contact with the
heads by opening the gate of the head
assembly. This will reduce wear on
the heads and prevent the oxide coat 
ing on the tape from depositing on
the heads and impairing their per 
formance.
REWIND
The equipment can be started in rewind or
switched to rewind from any of the operating
modes by pressing the rewind button S507.
PLAY OR RECORD
The tape is set into play motion at the speed
selected by the tape speed switch when the
PLAY button S505 is pressed. To change from
play to the record mode with the tape in
motion, press the record button 4S6 on the
electronic assembly.
STOP
To stop the tape while it is moving in any
mode, press the STOP button S502. The equip 
ment will stop automatically if the tape breaks
or runs off either reel.
FAST FORWARD
The equipment can be started in fast for 
ward or switched to fast forward from any of
the operating modes by pressing the fast for 
ward button S506.
Tape Motion
The tape motion is controlled by means of
four pushbuttons labeled REWIND, FAST
FWD, STOP and PLAY.
89-0144
Issue A
OPERATING TECHNIQUES
Threading the Tape
Thread the tape as shown in the illustration.
Unwind and inspect all new factory wound
reels of tape by running them through in the
FAST FORWARD mode. New tapes may be
looped to the hub in such a manner that the
tape will not come free at the end of the reel.
This will prevent the safety switch (S501)
from disengaging the capstan idler from the
capstan, which in turn results in a flat being
worn on the capstan idler wheel. (Any adhes 
ive material accumulation on the reel hub
may also keep the tape from coming free at
the end of the reel, and should therefore be
removed with solvent.)