Showa 5683, Operation Manual

Page: 33 / 68

３−１２
G) All unit key locking switch (3)
Key locking is made for all amplifier units in a case by pushing up (ON) the key locking switch for
all units (3). In this case, the all units key locking LED comes on. While key locking is effective,
the BAL switch for all units (1) positioned in a case, BAL knob (4), measuring range selection
knob (8), measuring range fine-tuning knob (9), calibration value selection knob (12), and filter
selection (16) that are positioned on the front panel of each amplifier unit do not function. To
cancel the key locking, hold down the key locking switch for all units (3). In this case, if key locking
is set in each amplifier unit, the key locking status is maintained. This is applicable when two or
more cases are being used.
H) Remote box
The same operations are available when a small control box like in Fig.3-10 is used. The BAL
switch should include a locking mechanism in order to avoid erroneous operations. Use a
momentary switch accordingly.
3.6.3 Heat Release for Case
A) Using standalone rack-mounting case
As a rack-mounting case does not have legs, avoid placing it on a desk or floor. Otherwise, heat
cannot be released, resulting in damages to amplifiers. It should be properly mounted.
①＋ＣＡＬ ②−ＣＡＬ ③ＢＡＬ
④ＯＳＣ ⑤ＧＮＤ ⑥KEYLOCK
⑦ＧＮＤ ⑦Ｎ．Ｃ ⑧Ｎ．Ｃ
20mm and over
Fig.3-12 Setting of rack-mounting case
Floor or Desk
Rack-mounting case
Case/Interface Connector Pin Alignment
Remote Box
CAUTION
Fig.3-11 Schematic diagram of Remote
Table3-6 Interface Connector at Rear Face
of Case