Bose Acoustic Wave AW-1 Manual - Page 11

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Bose Acoustic Wave AW-1 Manual

AM Alignment

(See Figures 3, 5 and 6)
1. Tuning Bias Alignment
1.1 Connect the positive side of a dc meter
to pin 8 of P101/ J101 (tuning bias) and the
negative side to pin 2 of P101/ J101.
1.2 Adjust the tuner to 530kHz. Adjust
T102 (AM OSC) for a 1.3 ± 0.3Vdc tuning
bias.
1.3 Adjust the tuner to 1620kHz. Adjust
CV1 (AM OSC) for a 7.6 ± .05Vdc tuning
bias.
1.4 Repeat these steps until the best
adjustment is made.
2. Tracking Alignment
2.1 Adjust an AM signal generator to
600kHz, 30% modulation, 400Hz, 70dBu
field strength at the AM antenna. Adjust the
tuner to 600kHz.
2.2 Adjust the AM bar antenna's (TX1) coil
for maximum output measured at the
auxiliary output. Fix the bar antenna's coil
with paraffin.
2.3 Adjust the AM signal generator and the
unit to 1400kHz.
2.4 Adjust CV2 (ANT.) and T103 (IFT) for
maximum output measured at the auxiliary
output.
2.5 Repeat these steps until a maximum
output is measured at the auxiliary output.
3. IF Alignment
3.1 Adjust an AM signal generator to
1000kHz, 30% modulation, 400Hz, 70dBu
field strength at the AM antenna. Adjust the
tuner to 1000kHz.

TEST PROCEDURES

11
3.2 Adjust T103 (IFT) for maximum output
measured at the auxiliary output.

FM Alignment

(See Figure 5)
4. IF Alignment
4.1 Inject a 98.1MHz, 90% modulation,
1kHz, pilot on with 10% modulation, 72dBu
RF signal to the external FM antenna input.
Adjust the tuner to 98.1MHz.
4.2 Adjust T101 (IFT) for minimum distor-
tion measured at the auxiliary output.
Note: The FM front end (TV1) needs no
adjustment. Replacement front ends are
adjusted at the factory.

Cassette Deck Adjustment

(Figures 4, 6, and 7)
5. Playback/ Record head Azimuth Adjust-
ment
5.1 Insert a 10kHz, -10dB test tape (MTT-
114) into the cassette deck and press play.
5.2 Adjust the P/R head azimuth screw for
left and right maximum output measured at
the auxiliary output.
Note: Fix the azimuth screw with adhesive
after adjustment is complete.
6. Erase head Azimuth Adjustment
6.1 Insert a mirror test tape into the cas-
sette deck and press play.
6.2 Adjust the erase head azimuth screw
so that the tape does not touch the guide
rails on the erase head.
7. Tape Speed Adjustment
7.1 Insert a 3kHz, -10dB test tape (MT111)
into the cassette deck and press play.