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QT-70H(R)
•
For the details of the test tapes used for the measurement,
refer
to the
Table
"TEST
on page 19.
ITEM
USING
JIG
Pinch
Tension gauge
roller
(500 g)
pressure
Driving
Tape tention
measuring
power
cassette
Forward
TW-2412
Reverse
TW-2422
Torque
Torque meter
Play, Forward
TW-21
11
Play, Reverse
TW-2121
Fast-forward
TW-2231
Rewind
TW-2231
Azimuth
Test tape
MTT-1
14
Tape
Test tape
speed
MTT-III
* 1.
TO perform the
azimuth
playback
screw
first
screw.
SETTING
Volume
control:
POSITION
Balance
control:
OF SWITCH
Tone
control:
AND
KNOB
Function
selector switch: Tape
Tape selector
Beat
cancel
ITEM
INPUT
BIAS
OSCILLATOR
FREQUENCY
ERASE
CURRENT
PLAYBACK
Test tape
AMPLIFIER
MTT-118
SENSITIVITY
MECHANICAL
TAPES
FOR
MEASUREMENT"
ADJUSTMENT
REMARKS
(CHECK)
POINTS
Pinch
roller
300 — 420 g
pressure
spring
• If the reading is
outside
the range,
replace
the
pressure spring of
the pinch roller.
More
than
150 g
(Play, Forward:
35 — 60 g-cm)
(Play, Reverse:
35 — 60 g-cm)
(Fast-forward:
85 — 125 g-cm)
(Rewind:
85 — 125 g-cm)
Azimuth
Sine
waveform
adjusting screw
attains
the
*1
Reverse
maximum.
@ Forward
Variable
resistor
10
on
motor
adjustment,
adjust the reverse
and then the forward
playback
CIRCUIT
ADJUSTMENT
Maximum
Center
Center
switch:
Normal
switch:
A
ADJUST-
MENT
POINT
REMARKS
(CHECK)
(A: 60
kHz) QT-70H
(A: 61.5
kHz)
QT-70E
(B: A+
1.5 ± 0.7 kHz)
(C: A—
5.0±
1.5 kHz)
(Normal:
11.5 ± 3 V)
(Cr02:
15.5 ± 3 V)
(Metal:
23±4
V)
(1.4 V)
ADJUSTMENT
Reverse
o
O Reverse
Figure
PINCH
AZIMUTH
E.V.:
Playback
Mode
Test Tape
unit
MTT-114
Pecord/Playback
Head
Figure 8—2 AZIMUTH
Playback Mode
Test TQe
unit
MTT.III
Figure 8—3 TAPE SPEED
(AUDIO
SECTION)
Record/Playback
Record
Mode
Head
unit
Figure
BIAS OSCILLATOR
Record
Mode
Erase
Unit
Figure 8—5 ERASE
Headphones Jack
Playbæk
Test Tape
unit
MTT-118
Record/Playback
Head
Figure
PLAYBACK
Forward
Forward
ROLLER
PRESSURE
AND
POINTS
Electronic
Voltmeter
Dual-Troce
Headphones Jac k
Sy ncroæope
(L-ch)
CHI
CH2
10 kohm
x 2
GND
Headphones Jack
Headphones Jack
Frequency Counter
10 kohm
ooo
GND
Oscilloscope
Frequency
Counter
GND
FREQUENCY
Oscillocope
Head
GND
CURRENT
Oscilloscope
Mode
10 kohm
GND
AMPLIFIER
SENSITIVITY
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