Teac R-H300 - Measurement and Adjustment Methods; Head Azimuth Adjustment; Tape Speed Adjustment; Playback Gain Adjustment

MEASUREMENT
AND
ADJUSTMENT
METHODS.
_-
Measurement
condition
Test
tape
|
|
«
Dolby
NR
position:
OFF
«
Head
azimuth
(10KHz,
-10dB):
MTT-114N
-
Make
sure
heads
are
clean
+
Tape
speed
(3KHz,
-10dB):
MTT-111N
—*
Make
sure
caper
and
pressure
roller
are
-
Playback
frequency
response
MTT-257H
clean.
|
(125KHz,
1KHz,
TOKHZ,
-10dB)
Measuring
instruments
|
-
Playback
gain:
MT-T-150
-
EVM
(Electronic
Voltmeter)
_
)
-
Blank
tape
-
Oscilloscope
|
Normal
blank
tape:
MTT-
5513
-
Frequency
countér
CrO2z
back
tape:
MTT-5563
»
AF
Oscillator
_
Metal
back
tape:
MTT-5572
¢ DC Voltmeter
« ATT (Attenuator or Audio Generator)
- Resistor (6000hm) |
HEAD AZIMUTH ADJUSTMENT
1. Test equipment connections are shown'l in fig. 1.
2. Playback the head Azimuth test tape and regulate the angle
adjust screw so that the outputs of L-ch and R-ch aré maxi-
mized. (When the, adjusting positions are differene with L-ch
and R-ch find a position Where the outputs of L-ch and R-ch
are balanced and then make the adjustment.)
3. At the same time, obtain a lissajous waveform and eliminate
ohase deflection.
4, After the adjustment, apply screw lock to the angle adjusting
value.
LINE OUT
f
Azimuth
screw(REV)
Azimuth
TAPE SPEED ADJUSTMENT
1. Test equipment connectidns: are shown in fig. 2.
2. Playback the middie part of the test tape.
LINE OUT
Adjustment
Point
.
Standard
Value
3,
Q00HZ
+
+
30H2
Ce
ee
eee
-
igital
frequency
:
:
—
—
Oe
counter”
(Fig 2).
PLAYBACK GAIN ADSL STMENT -
1. Test equipment. connections até shown in fig. 3
2. Playback the playback gain test tape. (MTT- 150).
3. Adjust plyback gain.
Adjustment Point
Standard Value | 535mV
ones a raeee arenes lire
~ LINE OUT
' SERVICE MANUAL