12
TEST PROCEDURES
STANDARD
SIGNAL
GENERATOR
STANDARD
SIGNAL
GENERATOR
60cm
TEST
LOOP
BAR
ANTENNA
(TOP VIEW)
(SIDE VIEW)
Figure 3. AM Test Setup
The equivalent field intensity is 26dB less
than the generator output level or 1/20
th
of
the output voltage.
7.2 Adjust the cassette deck's motor to
3kHz measured at the auxiliary output.
8. Dolby Level Adjustment
8.1 Insert a 400Hz, 0db 200nWb/m test
tape (MTT-150) into the cassette deck and
press play.
8.2 Adjust RV503 (left channel) and RV504
(right channel) for 300, +36, -32 mV mea-
sured at the auxiliary output.
9. Recording Level Adjustment
9.1 Connect the positive side of a dc meter
to pin11 for the right channel measurement
and pin3 for the left channel measurement.
Connect the negative side of the dc meter
to pin7 of P100/ J600.
9.2 Insert a blank tape into the cassette
deck and press the record and play buttons
simultaneously.
9.3 Apply a 400Hz signal at a level to
obtain a 200mV level at the auxiliary out-
put.
9.4 Adjust RV505 (left channel) and RV506
(right channel) for .59mVdc measured at
P100/ J600.
10. Bias Level Adjustment
10.1 Connect the positive side of a dc
meter to pin11 for the right channel mea-
surement and pin3 for the left channel
measurement. Connect the negative side of
the dc meter to pin7 of P100/ J600.
10.2 Insert a blank tape (normal bias) into
the cassette deck and press the record and
play buttons simultaneously.
10.3 Adjust RV501 (right channel) and
RV502 (left channel) for 6.5mV measured
at P100/ J600.
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