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QT-70H(R)
©)
MECHANICAL ADJUSTMENT
e
For the details of the test tapes used for the measurement,
refer to the Table ''TEST TAPES FOR MEASUREMENT"
Reverse
on page 19.
ITEM
USING JIG
ADJUSTMENT
| REMARKS
(CHECK)
POINTS
Pinch
Tension gauge | Pinch roller
300 — 420g
roller
(500 g)
pressure spring
* If the reading is
@) Reverse
Q
Forward
pressure
outside the range,
replace the
pressure spring of
the pinch roller.
Figure 8—1
PINCH ROLLER PRESSURE AND
AZIMUTH POINTS
Driving
power
Tape tention
More than 150g
measuring
E.V.: Electronic Voltmeter
ainpines
Dual-Trace
orwear
Headphones Jack
Syncroscope
TW-2412
(L-ch)
Reverse
Playback
TW-2422
Torque meter
(Play, Forward:
Play, Forward
35 — 60 g-cm)
Tt
TW-2111
(Play, Reverse:
Mica
Play, Reverse
35 — 60 g-cm)
TW-2121
(Fast-forward:
Fast-forward
5 — 125
g-cm)
TW-2231
aes.
eee
eee
ees
Jack
Rewind
85 — 125 g-cm)
ies
TW-2231
Figure 8—2 AZIMUTH
Azimuth
Sine waveform
attains the
maximum.
Azimuth
adjusting screw
*1 @ Reverse
@ Forward
Tape
Test tape
Variable resistor
3,000 + Sy
speed
MTT-111
on motor
"19H
To perform the azimuth
adjustment, adjust the reverse
playback
screw
first and
then
the forward
playback
Figure 8-3
TAPE SPEED
screw.
Test tape
MTT-114
Headphones Jack
Playback Mode
Frequency Counter
pio kohm
CIRCUIT ADJUSTMENT (AUDIO SECTION)
Record/Playback
Head
Record Mode
Oscilloscope
SETTING
Volume control: Maximum
POSITION
Balance control: Center
OF SWITCH
Tone control: Center
AND
KNOB
Function selector switch: Tape
Tape selector switch: Normal
Beat cancel switch: A
Frequency
Counter
REMARKS (CHECK)
(A: 60 + 4 kHz) QT-70H
OSCILLATOR
(A: 61.5 + 4 kHz)
FREQUENCY
QT-70E
(B:
A+ 1.5 £0.7 kHz)
(C:
A— 5.0 + 1.5 kHz)
Oscilloscope
Record Mode
Erase Head
(Normal: 11.5 +3 V)
CURRENT
(CrO2z: 15.5+3 V)
PLAYBACK
Test tape
AMPLIFIER
MTT-118
SENSITIVITY
Oscilloscope
Headphones Jack
Playback Mode
Record/Playback
Head
Figure 8-6 PLAYBACK AMPLIFIER SENSITIVITY
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