Blown Fuse Conditions - Gestetner A294 Service Manual

BLOWN FUSE CONDITIONS

7.3 BLOWN FUSE CONDITIONS
Fuses are not used for the output lines from the PSU. An electronic current cut-off
method is used instead.
The PSU consists of three converters; 1st converter, 2nd converter, and Energy
saver converter. Each converter has an LED which indicates the status of the
converter.
LED No.
Converter
Output
In Stand-by Condition
In Energy Saver Mode
LED status when a converter is defective
Energy saver
1st
2nd
When the 1st converter is defective, the output of the 2nd converter is also
stopped. When the energy saver converter is defective, all the outputs are stopped.
There is a circuit breaker CB1 on the PSU which cuts all the power from the PSU
when excess current flows.
Additionally, there is a fuse only for the AC input line of the energy saver converter.
Fuse Symptom when turning on the main power switch
Power Supply Board
FU404 No response
A294/A295
CÓPIA NÃO CONTROLADA
LED 1
Energy saver
Vcc1
On
On
Off
On
On
7-42
CÓPIA NÃO CONTROLADA
LED 2
1st Converter 2nd Converter
Vcc2, Vmm Vaa, Vca, Vcb
On
Off
Off
Off
On
Rev. 9/2001
LED 3
On
Off
Off
Off
Off
SM