2. Until July 1976, these devices were equipped with individual and built-in voltage stabilizers. After this date, they began to install a combined voltage stabilizer for both of these devices.
Figure 10.20. Typical voltage stabilizer device.
Figure 10.21. Different types of instrument voltage stabilizers.
3. It is very important not to confuse voltage stabilizers or printed circuit boards of different types. Printed circuit boards are identified as shown in Figures 10.22 and 10.23.
Figure 10.22. Printed circuit board markings (earlier models).
Figure 10.23. Printed circuit board markings (later models).

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