Jenway 6300 Ser Man
12
2.3
Power Supply Voltages
Also see Section 9 - Circuit Diagrams
Before commencing more complex fault finding it is important to
check all the internally generated supply voltages are correct. The
following list is a useful guide to help quickly check these are
functioning correctly. Not all the points where these voltages can
be measured are given and where the voltage is stated as
unregulated variations may occur. In general regulated supplies
should vary by no more than +/-5% from their nominal value.
Tungsten Lamp Supply
, 12V dc regulated and set by VR1,
measure at SK9 pin 5 with respect to SK9 pin 6 on the power
supply PCB and at the terminals on the lamp base with the lamp
fitted.
Solenoid and Fan Supplies
, 12V dc regulated and pre-set,
measure at SK1 pin 1 with respect to SK1 pin 2 on the power
supply PCB and on the solenoid and fan terminals.
Digital Supply
, 5V dc regulated and pre-set, measure at SK5 pin 1
with respect to SK5 pin 2 or on SK1 pin 1 with respect to SK1 pin
2 on the Display PCB.
Stepper Motor Drive
, 30V dc unregulated, also acts as
unregulated supply for lamp, solenoid and fan supplies, measure
between Star1 and Star 2 on power supply PCB.
DAC Supply,
+/- 10V dc supplies.
+10V dc generated on the RS232 Interface, IC101, on the Display
PCB, measure between pins 2 (positive) and 15 (0V) on IC101 on
the Display PCB.
-10V dc generated on the RS232 Interface, IC101, on the Display
PCB, measure between pins 8 (negative) and 15 (0V) on IC101 on
the Display PCB.
