P I N C H R O L L E R P R E S S U R E C H E C K
1. Place the unit in PLAY mode.
2. Push the pinch roller, at the point shown in Fig. 9-1, by
using a tension gauge (500
so that it will come off the
capstan. Then, release the tension slowly until the pinch
roller hits the capstan again (i.e., the pinch roller is about to
rotate again). Then check the tension gauge is reading
350 gr. to 420 gr.
3. If the reading is outside the range of 350 gr. to 420 gr.
replace the pressure spring of the pinch roller.
T O R Q U E C H E C K A T P L A Y , F A S T F O R W A R D A N D
REWIND MODES
Put a torque meter cassette in the cassette compartment of the
set, and see that the measured torque in each mode is normal
as follows:
TAPE SPEED ADJUSTMENT (See Figs. 9-2 and
Note:
The high speed operation has priority over the normal speed
operation, and so try to do the adjustment for the former first
and then for the latter.
For High Speed Operation
1. Connect a wow/flutter meter to the Line Output socket
across a
ohm resistor, and shortcircuit the deck
control terminal
2.
a test tape (TEAC, MTT-118, 1
prerecorded)
at
its middle part but not at its start or end point.
3. Adjust the semi-variable resistors
for the deck 1
and VR502 for the deak 2) located on the deck 1 and deck
2 mechanism
Boards, so that the output frequency is
1 9 9 0 t o
for the deck and
to
for
the deck 2.
For Normal Speed Operation:
1. Play a test tape (TEAC,
prerecorded).
2. Adjust the semi-variable resistors (VR503 for the deck 1
and VR504 for the deck 2) located on the deck 1 and deck
2 mechanism P.W. Boards, so that the output frequency is
2985 to
on the wow/flutter meter for both decks 1
and 2.
R E C O R D / P L A Y B A C K H E A D A Z I M U T H A D J U S T M E N T
1. Make Connection of instruments as shown in Fig. 9-4.
2. Set the Dubbing switch SW201 to the off position and Tape
Selector switch SW105 to Normal position.
3. Adjust the head azimuth adjusting screw so that sine
waveform attains the maximum and the same phase in right
and left.
4. Even without using the oscilloscope, also adjust the head
azimuth adjusting screw so that outputs of both the right
and left channels attain the maximum and the same phase
in right and left.
Note:
For some heads, there may be a phase difference between
right and left channels when the output is made maximum.
In this case, adjust the head azimuth so that such phase
difference will be as small as possible while keeping the
output still maximum.
Pinch Roller
Pressure Spring
Figure 9-l
Mode
Torque meter
cassette
Measured torque
Playback
Fast-forward
Rewind
TW-223
35
6 0 gram-cm
9 0
135 gram-cm
90
135 gram-cm
Figure 9-2
Figure 9-3
Test Tape
14
Oscilloscope
E . V .
as small as possible
Figure 9-4
Summary of Contents for GF-500
Page 5: ...zl I I I a 5 I I I t l I I I I I I I i _ _____ T j 211 Figure 5 BLOCK DIAGRAM 5 ...
Page 14: ...P VV 7BOARD 8 I 9 I 10 I 11 I 12 DE OF l Z 14 ...
Page 21: ...7 I 2 3 4 5 I 6 1 2 3 1 4 I 5 I 6 Figure 21 CABINET EXPLODED VIEW 21 ...
Page 22: ...1 2 3 4 5 I 6 A 8 C 2 D E F G H 1 2 3 4 5 6 Figure 22 CABINET EXPLODED VIEW 22 ...
