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November 30th, 1991
2.3.6. PSU
LIVE
Prevention
NEUTRAL
Arrestor
GROUND
PSU
Overheat Protection in the PSU
If the PSU thermistor temperature exceeds about 45 °C, the power supply
outputs from the PSU are disabled.
If this happens:
1. Switch off the machine.
2. Take out the PSU and examine it for damage. Take care because it may
be hot.
3. Put back the PSU and switch the machine on. If the machine does not op-
erate, change the PSU.
Surge
Main
Switch
+24VD
+24VD
To
To
Thermal
FCU
Head
DETAILED SECTION DESCRIPTIONS
PCBs AND THEIR FUNCTIONS
Surge Current
Prevention
Noise
Filter
+24VD
+24VS
Activation
To
Signal
FCU
2-12
Power Supply
Generation
Circuits
+5V
-12V
To
To
FCU
FCU
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