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LBI-31482
STEP
14.
Peform steps 14 and 15 Only if deemed necessary.
Discriminator: Apply a strong RF signal (approximately 1 mV Carrier with 1 kHz modulation at 3 kHz
deviation) and adjust the discriminator coil (L9) for maximum audio output level measured across the 4 ohm
speaker.
Service Note: If there are two output peaks, set the coil to the higher peak.
15.
Audio Output Level: Apply a strong RF signal (approximately 1 millivolt carrier with 1 kHz modulation, but
now at 2 kHz deviation). Set the power/volume switch to HI, and adjust the audio gain potentiometer (RV51) for
rated audio output (150 milliwatts or 0.775 volts RMS across the 4-ohm speaker).
Set the Power/Volume switch to LO. The audio output level should drop 10 dB +2 dH.
16.
Set up as in Step 11 above. Adjust squelch control (RV52) for an audible level of approximately 12 dB SINAD
squelch opening.
17.
Slide S53 to SEL position and push S52 to reset pager.
18.
Modulate the RF generator with the proper tone sequence from the 2-tone generator. Verify the alignment and
performance by successfully decoding several pages.
ALIGNMENT PROCEDURES
WITH TQ0602 TEST FIXTURE)
ALTERNATE TUNING PROCEDURE
1.
Remove Printed Board Assembly from Case and insert fully charged batteries.
2.
Place back cover of pager in fixture.
3.
Place the pager on the cover.
4.
Connect RF generator to RF input jack on fixture.
5.
Go to step 6 of the main alignment procedure and continue through that procedure to complete the alignment.
PROCEDURE
LBI-31482
RECEIVER ER-145-A1, B1, C1, D1
ISSUE 1
7
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