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3-2 Routine Maintenance Model 2701 Service Manual

Introduction

The information in this section deals with routine type maintenance and includes procedures

for setting the line voltage, replacing the Model 2701 line and front terminal AMPS fuses, and

replacing the amps fuses for the Model 7700 plug-in module. Replacement of the Model 2701

non-volatile RAM battery and module relay closure count is also covered.

Setting the line voltage and replacing the line fuse

WARNING Disconnect the line cord at the rear panel and remove all test leads con-

nected to the instrument (front and rear) before replacing the line fuse.

The power line fuse is located in the power module next to the AC power receptacle (see

Figure 3-1). If the line voltage must be changed or if the line fuse requires replacement, per-

form the following steps:

1. Place the tip of a ﬂat-blade screwdriver into the power module by the fuse holder

assembly (see Figure 3-1). Gently push in and to the left. Release pressure on the

assembly and its internal spring will push it out of the power module.

2. Remove the fuse and replace it with the type listed in Table 3-1.

CAUTION For continued protection against ﬁre or instrument damage, replace the

fuse only with the type and rating listed. If the instrument repeatedly

blows fuses, locate and correct the cause of the trouble before replacing the

fuse.

3. If conﬁguring the instrument for a different line voltage, remove the line voltage selec-

tor from the assembly and rotate it to the proper position. When the selector is installed

into the fuse holder assembly, the correct line voltage appears inverted in the window.

CAUTION Operating the Model 2701 on the wrong line voltage may result in

instrument damage.

4. Install the fuse holder assembly into the power module by pushing it in until it locks in

place.

Keithley 2701 Service Manual

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