1 / visual inspection (Soldering, chips, beads polarities, diodes, etc.).

2 / Put C10 '(47uF/25V) in parallel with C10,
    put C25 '(100nF) in parallel with C25.

3 / Energize without RF connected and measure the following voltages are:

R26-mass: > +13.2 V
R27-mass: < -13.5 V
IC19 (outer side) mass: +12V
IC7.14 mass: +5V
R29 (C13 side): -10.8 V

4 / Connect the RF and control channels.

5 / Plug the RF output of channel D to the oscilloscope, with an input impedance of 50 ohms, and adjusting P2 for:

V_RF > 2.2 Vpp at 90.00 MHz

6 / Select a different channel, the RF must be:

V_RF < 100 mVpp.

Repeat steps 5 and 6 for all channels.

7 / Try a 5 probe signal on all channels (do not handle the noise 50Hz) in order to verify the proper functioning of DS 214.

8 / Solder the shields. Do not forget to make notches to avoid damaging the printed circuit tracks.

9 / Measure: V_DET, V_SIG, V_BRUIT, and the quality of search mode for all probes (for 5 probe, do not forget to measure the 1T.)

10 / Try the 1, 2 and 5 probes on all channels, check the noise (with manual for 5 probe) and the search mode, and the signal. For 1 and 2 probes at the lowest signal, and for 5 probe the signal at 1T.

11 / Try switching between the 1 probe and 2 probe, with both probes on channels A and B.
Put the PT2025 in remote and change channels, press the remote button again, the information must go from 1 to 2 without problems.

12 / Put one 5 probe on the D channel, and the PT2025 in high-end, disconnect the RF input of the mux, then set the oscilloscope to 20 mV / div, adjust P1 for:
0 V 10 mV

13 / Laquer the pots, paste capabilities (large).

14 / Record the serial number.

15 / Fit the columns.

16 / Close the box.