Gymna Pulson 330, Руководство по обслуживанию

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9. Power supply.
Main fuses are inserted in the main entrance ( F1 and F2, 1A fast ).
The transformer contains a thermic fuse . It will cut off the primary
winding, when the inside temperature exceeds 120 °C. To switch on
again, transformer temperature has to go below about 60 °C.
For this reason, there is no need for secondary fuses anymore.
The ringcore transformer can be fed either with an incoming voltage of
230V/50Hz ( CON 6 ) or with 115V/60Hz ( CON 5).
There are 2 secondary windings. Output voltage of winding 1 is 22V,
winding 2 produces 8V.
Power supply output voltages:
1. VCC: Is a 5V stabilised voltage, with a maximum output current of
700 mA.
D22 protects U12 during switch off.
2. VEE: Is a -5V stabilised voltage, with a maximum output current of
100 mA.
D21 protects U13 during switch off.
3. V27: Is a non stabilised power supply of approximately 27V.
VLK3: analog ground, connected to the metal cover-shield of pcb 2.
VLK4: analog ground, not connected and can be used for service.
RV1: Varistor. Filters out spikes on the incoming voltage.
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