5. CIRCUIT DESCRIPTION
5.1 Main PCB (ELUS004-L100).
The main PCB contains most of the electronic circuits of the Phyaction Guidance E/C.
Since the layout of the PCB is mainly SMD based, most repair works can only be done by
GymnaUniphy nv.
Limited repair works may be done only
after the permission of GymnaUniphy nv.
For this reason, it is strongly recommended to keep at least one main PCB in stock, in order to solve
most problems in the most efficient way.
/ The main PCB of the Phyaction Guidance E/C is exactly the same as the main PCB of the Gymna
Combi 500/Duo500. Some installed components are not used in the Guidance/C but only in the
Combi 500.
5.1.1 Power supply.
The mains voltage is applied to a ringcore transformer so that one single voltage of 24 VAC appears
at TP59.
However, due to tolerances on the line voltage, the output voltage of the transformer may vary
between +21 VAC and + 40VAC.
The secondary of the transformer has a fuse of T 5A L (F1) that is installed on the main PCB.
Phyaction Guidance E/C – service manual version 0.5 Page 14
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