Ferrograph Logic 7 Owners Manual

Page 1

FE BRO GRAPH

Logic Seven Handbook

Page 2

FINAL TEST O.I(.

IIIIICTOI'I
an!"
up In.
103340
M o D 1 r x c A 1' 1 o N - Power Amplifier Board

£291: 7 - Serial No. 101,400 onwards

The power amplifier transistors TRSOO, 502 have been
changed and also the values of C 504, 507 as listed
Extra components R521 5 C508 in series have
been added from the output (junction C500/R512 ) to
earth {junction R503/R504).

below.

Power Amnlifier Board 025-100

R521
(2504
C507
C508
TRSOO
TRSOZ

10 ohm

47p?

4 . 7,1?

0-047?
Transistcr
Transistor

25V

63V Electrolytic
250V

ED 535

ED 535

625-2 2-10
13 1-816
130-007
131-506
825-074
825-074

Page 21

Controls

The main functions ol the deck are controlled by logic circuitry with tape motion sensing and
memory to enable the recorder to move smoothly lrom each function to any other simply by pressing
the appropriate control button, viz. Wind, Pause. Run Er Record.

For example, with the tape winding rapidly lrorn right to left, on pressing Run the recorder
moves into Pause. thus applying the brakes. When the tape comes to rest, the recorder automatically
moves into Run and the tape starts at the selected speed. Bright and clear indicators show the
current condition at the deck logic.

Pause

Pause should be pressed to stop the tape.

In cause all three motors are energised and the capstan is rotating, although the brakes are
applied to the reels.

Run

Run should be pressed Io star! the tape running a! the selected (ape speed.

When lirst switching on it is advisable to press Pause (causing the capstan to rotate) and then
Run, when the tape starts virtually instantaneously. On moving directly into Run trom Stop (when
the capstan is normally stationary). a slight slurring may occur while the capstan picks up speed.

0n pressing Run while in Wind, the recorder moves into Pause, applying the brakes. When
the tape comes to rest, the recorder automatically moves into Run and the tape starts at the selected
speed.

Wind

Wind should be pressed to wind the tape quickly or slowly m either direction as dererrnined by
Iha Wind control on the right.

The high lrequency content at the signal is automatically reduced to avoid excessive shrillness
when winding at high speed.

At the end of winding the tape is stopped either by pressing Pause or on moving to Run.

Rev

Rev should be pressed continuously to reverse the direction ol last winding (at (he same speed).

This reverses the effect of the Wind control which still determines the speed of winding but in
the opposite direction. When Rev is released. the normal Wind condition is restored.

Rev can be pressed without previously pressing Wind, when the tape is wound in the reverse
direction as described. When Rev is released. whatever the previous operation, the recorder moves
into the normal Wind condition.

This lacllity is provided lor use on the Remote Unit, where the Wind control is not available
to vary the direction (and speed) at winding.

Mute
rhe Mule switch should he pressed to [he left to silence the monitor signal when tape winding.
It is restored by pressing the switch to the right,

flacard

Record must he pressed simultaneously with Run (or Pause) to erase and record on the
track) selected.

Once the Record indicator is lit, the tape is stopped or started by pressing Pause or Run res-
pectively, when the Record condition continues,

Cancel
Cancel should be pressed to slap erasing/recording (on Pause or Run).
The Record condition is cancelled automatically on pressing Wind, Rev or Stopt

Sta

grog should be pressed to switch all the deck mechanics if the rape is to be stationery for
mare than a few minutes.

In Stop, the deck mechanics and all three motors are tie-energised and the recorder is shut
down although the amplifiers are still operative.

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