Safety 1st TR233 Dokumentacja Pobierz pdf (Strona 65)

4.5.5 VHF Receiver Front End Alignment

Step

Result

Measured by

Result

Measured at

Adjust

Result Notes

Switch on power

and select

channel 3.

Highest freq.

channel.

Antenna

socket SK403

RF sig. gen.

output.

50uV pd., and

freq. of ch. 3.

Modulate generator

with 1 kHz at 60% of

max. dev.

DVM,

dc voltage

range.

TP403 R557 16.0 +/- 0.5V

Sets tracking gain

adjustment.

CRO,

5mV ac per div.

10uSec per div.

1 0x probe.

PIN 2 of

Tuning cores

U401

FL401.

Max level

of FL400 and

Sets tuning of filters.

an CRO.

5 Select ch. 1 Lowest freq. channel.

RF sig. gen.

output.

Freq. of

channel l

CRO,

5mV per div.

l0uSec per div.

10x probe.

PIN 2 of

U401.

R554

Max level

on CRO.

Sets tracking offset

adjustment.

8 Select ch. 3

Highest freq.

channel.

Antenna

socket SK402

RF sig. gen.

output.

Freq. of

channel 3

CRO,

5mV per div.

10uSec per div.

1 0x probe

PIN 2 of

U401

R557

Max level

on CRO.

Slight re-adjustment

may be necessary

RF sig. gen.

output.

1 mV pd.

AF level

meter.

Speaker

output at

S K202

Volume

control.

300mW in

4ohm.

AF level

meter.

Speaker

output at

SK202.

L404

Max AF

level.

Re-adjust volume

for 300mW output

when L404 is peaked

Distortion

Meter

Speaker

output at

SK202.

L404 Less than 3%.

Slight re-adjustment

of L404 may be

necessary

Section 4 Page 7

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