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DESCRIPTION OF OPERATION
AP01 DC Control circuit board
Circuit board AP01 controls the DC part of the machine. It also acts as an interface between
processor board AP04 and circuit boards AP02, AP05 and AP06. Some of the functions of
those circuit boards are also described here.
From serial no. 246--xxx--xxxx a new version of the board is fitted t o the machines. T his
description applies to all versions of the board. All versions can be used in all machines.
NOTE: All potentiometer settings are made at the factory. Only potentiometers R301, R333
and R335 may need to be readjusted when replacing the circuit board, see page 24.
AP01:1 Power supply
Power supply circuits on the DC circuit board, AP01
Power is supplied by a switched voltage regulator with a switching f requency of
about 40 kHz. The HF transformer, TR201, has a dielectric test voltage of 5kV.
The regulator is syncronised with the P WM controller via optocoupler IC1.
To check the output voltage: measure between connector XD pin 1 (DC+) and
XD pin 3 ( 0V). It must be 19V ±0.5V. If it is not, adjust with potentiometer R7.
See the componet positions diagram for location of R7 and connector XD.
The +5V and ±15V supplies are regulated by normal voltage regulators. The
tolerances are ±4%. When the machine is switched on the --15V suppy powers
the Mains On LED on the front panel of the machine.
±UT1, ±UT2, E1 and E2 are used for the IGBT drives, see page 20.
+5V is used internally on AP01.
±15V, DC+ (19 ±0.5V) and DC-- (about --18 to --20V) are used internally and
also supply other circuit boards. See the overwiev below.
0V is connected to 0V on AP04, AP05 and to shunt RS01 via wire 015. See the
wiring diagram and the diagram below.
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