Operation & Service Manual
Section II
Model 1805B RF Control Unit
Installation and Shipment
the voltage selector drum to change the operational power requirements to either 100, 120,
220, or 240 Vac.
Table 2-1 IEEE-488 INTERFACE BUS Signal Designators
LINE VOLTAGE AND FUSE SELECTION
When shipping with the U.S., TEGAM configures the 1805B for 120-Volt operation.
Overseas shipments may vary. The following steps provide procedures to reconfigure the line
voltage and replace the Fuse Assembly (Figure 2-5). Table 2-2 lists fuse requirements for the
available operational voltages. Model 1805B accepts either American (0.25” x 1.250”) or
European (5mm x 20mm) fuses.
!
Sufficient power levels are present at the Power Input Assembly to cause personal injury.
Ensure that the power cord is DISCONNECTED before attempting to change fuses.
Table 2-2 Line Voltage Fuse Requirements
!
DO NOT connect or apply power to this instrument until the Power Input Assembly has been
adjusted to the operational line voltage.
a. Disconnect the power cord from the Voltage Selector/Fuse Assembly (Figure 2-5).
b. Slide plastic window to the left and pull to the back and left on the fuse pull lever to
eject the fuse.
c. Remove the Voltage Selector PC Board from the assembly by pulling it out carefully.
2-5
Pin No
.
Signal Line
Pin No.
Signal Line
1
DIO1
13
DIO 5
2
DIO2
14
DIO 6
3
DIO3
15
DIO 7
4
DIO4
16
DIO 8
5
EOI (24)
17
REN (24)
6
DAV
18
GND (6)
7
NRFD
19
GND (7)
8
NDAC
20
GND (8)
9
IFC
21
GND (9)
10
SRQ
22
GND (10)
11
ATN
23
GND (11)
12
SHIELD
24
GND, LOGIC
Operational Line Voltage
Fuse Requirement TEGAM Part No.
100 or 120 Volts ±10% at 48 to 66 Hz.
0.75 AMP Slo-Blo
FU-1
220 or 240 Volts ±10% at 48 to 66 Hz
0.4 AMP Slo-Blo
FU-2
WARNING
WARNING
