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MAINTENANCE
The following instructions are for use by
qualified service personnel only To avoid
electric shock, do not perform servicing
other than contained in the operating in-
structions unless you are qualified to do so.
Remember that ac line voltage is present on
the line voltage input circuits any time the
instrument is plugged into an ac outlet. Al-
ways unplug the unit before performing
service procedures.
DISASSEMBLY AND REASSEMBLY
In order to access the fuse and the line voltage selector, the top of the
case must be removed. Disassembly and reassembly procedures are as
follows:
Disassembly
I. Unplug the unit and turn it upside down.
2. Remove the four screws from the bottom of the case.
3. Turn the unit over, and lift off the top cover.
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Reassembly
1. Line up the slots in the top case half with the front panel and the
back panel.
2. Carefully push the top half onto the bottom half.
3. Turn the unit upside down, and replace the four screws.
FUSE REPLACEMENT
If the fuse blows, the DIALED NUMBER DISPLAY will not light
and the instrument will not operate.
1. To replace a fuse, disassemble the case as described above.
2.
The fuse is located at the rear of the circuit board, to the right of the
power transformer.
The fuse should not open unless aproblem has developed in the unit.
Try to determine and correct the cause of the blown fuse, then
replace only with the correct value fuse (3116 A slow blow for 100
V-120 V operation or 118 A slow blow for 220 V-240 V operation.
3. Reassemble case as described above.
LINE VOLTAGE CONVERSION
1. Disassemble the case as described above.
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