16 — Power Supply Unit
16–3
CX20/CX30/CX34 Service Manual
16.1
Description
The power supply unit transforms, rectifies and smooths the mains electricity
supply into several lower–voltage outputs. The input voltage varies according to
market and may be either 240 Vac or 110 Vac (determined by type of mains
transformer and not selectable in service). The output voltages are:
+5 Vdc
+10/0/–10 Vdc
+46 Vdc
+12/0/–12 Vdc
+22 Vdc
9.6 Vac
Figure 16.1
Power Supply PCB – Component Highlight
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NOTE:
The test points (TP#s) are not used during servicing, they are only
provided for manufacturing purposes.
The power supply unit consists of a switched–mode power supply (SMPS)
installed on a power supply PCB. The PCB has printed circuit tracks on both
sides and includes two electrical connectors (SK1 and PL1) and two fuses (FS1
and FS2).
The mains supply is received at socket SK1 and is decoupled from the source
by an isolating transformer. Fuse FS1 (2A) protects the input circuitry of the
SMPS.
Summary of Contents for CX20 SERIES
Page 258: ...PL 1 CX20 CX30 CX34 Service Manual Section PL Parts List ...
Page 284: ......
Page 287: ......
Page 317: ...Addendum A Phase 1 4 and CX34 Parts List A 30 CX20 CX30 CX34 Addendum A ...
Page 318: ......
Page 321: ......
Page 323: ...Contents B 2 Addendum B ...
Page 343: ...Addendum B Phase 1 5 1 5 3 and New Main PCB B 22 Addendum B ...
Page 344: ......
Page 347: ......
Page 351: ...PL Parts List Devlin Keyboard C 6 Addendum C ...
Page 352: ......