Bose Acoustic Wave AW-1 Руководство - Страница 11

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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

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.