Philips PM 5125 Manual page 29

33
- Set switch SK4 to position 0 dB.
- Set attenuator R2 fully clockwise.
- Turn the spindle of double potentiometer RI until the frequency at
terminal BU4 is l kHz ~ 0,4%.
- Fix the frequency dial to the spindle of RI in such a position that
the dial indicates 10.
2. -Turn the frequency dial to position 100 and check that the frequency
at terminal BU4 is l0 kHz ~ 0.2%.
- Turn the frequency dial successively to positions I5, 20, 30, 50 and
70 and check that the frequency at terminal BU4 is respectively
1.5 kHz, 2 kHz, 3 kHz, 5 kHz and 7 kHz. Tolerance: < 2%.
3. -Set switch SK3 to position x ]0.
- Set the frequency dial successively to positions 10, 30 and 100 and
check that the frequency at terminal BU4 is respectively 100 Hz, . .
300 Hz and 1 kHz. Tolerance: < 2.5%.
4. -Set switch SK3 to position x I.
- Sei the frequency dial successively to positions 1Q 30 and 100 and
check that the frequency at terminal BU4 is respectively lU Hz,
30 Hz and 100 Hz. Tolerance: < 4%.
5. -Set switch SK3 to position x 103
- Set the frequency dial to position 10.
- Adjust the frequency at terminal BU4 to 10 kHz ~ 0.2% by means
of trimmer C25. Tf this is not possible, select another value for C32.
- Set the frequency dial successively to positions 30 and 100 and
check that the frequency at terminal BU4 is respectively 30 kHz and
100 kHz. Tolerance: < 2.5%.
6. -Set switch SK3 to position x 104.
- Set the frequency dial to position 10 and adjust the frequency at
terminal BU4 to 100 kHz ~} 0.2% by means of trimmer C27. If this
is not possible, select another value for C34.
- Set the frequency dial to position 100 and check that the frequency
at terminal BU4 is 990 kHz ~ 0.2%. If necessary, adjust by means
of trimmer C35.
- Repeat the adjustments of trimmers C27 and C35 until both
frequencies are within 0.2%.
- Set the frequency dial successively to positions 30, 50 and 70 and
check that the frequency at terminal BU4 is respectively 300 kHz,
500 kHz and 700 kHz. Tolerance: < 4%.