Playback Performance - Teac A-450 Service Manual

7-1. PLAYBACK PERFORMANCE
NOTE
7-1-1. RECORD/PLAYBACK HEAD AZIMUTH
1.
Gp
ADJUSTMENTS
Load and play a TEAC MTT-150 test tape.
Make sure the phase relationship between the 2 signals
(left channel and right channel) is within 45° on the
oscilloscope.
Load a TEAC MTT-116U test tape.
Play the 10 kHz signal section of the tape.
Slowly
adjust the azimuth
adjusting nut for the
maximum indication on the VTVM.
Secure the nut with a drop of locking paint.
0° 45° 90° 180°
'
'
c
{
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IN PHASE OUT OF PHASE
Fig. 7-1 Confirming Phase Relationship
Adjusting Nut
R/P Head
Fig. 7-2 Head Azimuth Adjustments Location
7-1-2. SPECIFIED OUTPUT LEVEL SETTING
1.
2.
3.
4.
5
Load and play a TEAC MTT-150 test tape.
Adjust VR102/202 for 100 mV (—18 dB) on VTVM
connected to the CAL test points.
Change the VITVM connection to the OUTPUT jacks.
Set the OUTPUT controls fully clockwise.
Confirm that the output level is —3.5 dB + 1 dB (461
mV ~ 580 mV).
IMPORTANT
After this setting is done, do not disturb the Specified
Control Setting of the OUTPUT controls until the remain-
ing checks and adjustments are completed.
CONNECTION
OSCILLOSCOPE
under TEST
T- 389-2
Fig. 7-3 Connection
SWITCH & CONTROL SETTING:
T-469
OUTPUT Control: Proper setting
CONNECTION
(A)
E Wei Pe ine Edis Piao tid
DOLBY B-TYPE PROCESSOR PC BD.
DECK under TEST
U
OSCILLOSCOPE
(B)
Fig. 7-4 Connections
SWITCH & CONTROL SETTING: Same as 7-1-1.
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