Table of Contents
Advertisement
Model 280B
Functional Checks and Adjustments
SECTION 5
FUNCTIONAL CHECKS AND
ADJUSTMENTS
5.1 GENERAL
5.2 Functional Check
The following is an abbreviated operator test of the
Model 280B.
If
the machine fails to perfonn pro
perly on any of the checks, refer to Section 7 for
more detailed test procedures to be perfonned by a
qualified service engineer.
A. Turn power on and check that the STOP push
button and vu meter lamps are lighted.
B.
Load a reel of tape of the type normally used
on the equipment. As the tape break ann moves
into a vertical position, check that the capstan
starts to rotate.
C. Press the START pushbutton. Check that the
tape moves in a forward direction and that the
START lamp lights.
D. Press the STOP pushbutton and check that
tape motion stops and the STOP lamp lights.
E. Press the FAST .... pushbutton and check that
the FAST ..... lamp lights and the tape moves
forward in a fast wind.
F. Press the
~
FAST pushbutton. Check that the
..... FAST lamp lights and the tape moves in a
fast rewind.
G. Press the STOP pushbutton.
H. Input a signal (such as 1000 Hz) to the ma
chine. Set the MONITOR switch to RECORD
and adjust the RECORD LEVEL control for
the desired level on the vu meter. Set the
FUNCTION SELECTOR switch to RECORD
and set the MONITOR switch to PLAYBACK.
Press the START and then the RECORD
pushbuttons. Check that the START and
RECORD lamps light. Monitor the recorded
signal on the vu meter and external amplifier
speakers and check that playback is satisfac
tory. Repeat for each channel.
1.
For multichannel units only, rewind to the
beginning of the recorded signal, set the
FUNCTION SELECTOR switch to SYNC,
press the START pushbutton and observe
playback on the vu meter. Check that SYNC
is satisfactory. Repeat for each channel.
5-1/5-2
Advertisement
Chapters
Table of Contents
