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1.
2.
Record Amplifier Erase Current Check
(Refer to Figure 16-1)
Connect an Electronic Voltmeter to both ends of resistor
R317.
Place the unit in record
mode,
and set the deck 2 tape
selector switch SW104 to METAL position.
. Check that the Electronic Voltmeter is reading 160mV and
more.
Oscilloscope
Record mode
Erase Head
Figure 16-1
TAPE
SPEED
ADJUSTMENT
For Normal Speed Operation:
. Connect
a wow/flutter meter to the Line Output Socket
J301D (or J301E) across a 100Kohm resistor.
. Play a test tape (TEAC, MTT-111, 3kHz prerecorded) — at
its middle part but not at its start or end point.
. Adjust
the semi-variable resistors
(VR902
for the deck
1
and VR903
for the deck 2) on the mechanism
P.W.B. so
that the output frequency is 2985 to 3015 Hz for the deck
1 and 2970 to 3000 Hz for the deck 2.
For High Speed Operation:
At the deck 1;
Ts
2.
Place the unit in high speed dubbing mode with a test tape
(TEAC, MTT-118,
1kHz prerecorded) loaded in the deck 1.
Adjust the semi-variable
resistor (VR901)
on the mecha-
nism
P.W.B.
so
that
the
output
frequency
is 1990
to
2010 Hz on the wow/flutter meter.
At the deck 2;
1.
Short the base and emitter (test pin) of the transistor 0911
on
the
mechanism
P.W.B.
Place
the unit in high speed
dubbing mode with a test tape (TEAC, MTT-118) loaded in
the deck 2.
2. Adjust
the semi-variable
resistor
(VR904)
on the mecha-
nism
P.W.B.
so that
the
output
frequency
is 1980
to
2000 Hz on the wow/flutter meter.
Note:
For
the adjustment,
arrange
the deck
1 and deck
2 to
provide the same speed.
¥ i8g10
<r
tA FE
Frw'g
Figure 16-2
O-vRs01
B-vR\502
VR272
Figure 16-4
VR271
Figure 16-3
CIRCUIT
CONSTRUCTION
It is possible to select either normal tape speed or high tape
speed when you perform dubbing from the deck 1 to the deck
2 and the high speed is twice as fast as the normal speed.
£46=
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