Vision Fitness R44 Specifications download pdf (Page 26)

290A5276-17

Figure 6-2.

D. Control Head Fuse.

A solder-in sub-miniature fuse (F1 on the

bottom circuit board) provides short-circuit protec-

tion for the control head and cable. F1 is located

next to J6 (four-position RJ-11 connector) on the

circuit board. Failure of this fuse, although unlikely,

will cause the Premium Vision SL to be completely

inoperative. If failure of F1 is suspected, proceed as

follows:

1. Remove the circuit board as described

in 6-3.C. above.

2. Check the fuse for continuity with an

ohmmeter.

3. If fuse failure has occurred, replace

with an EXACT replacement (refer to paragraph 6-7).

NOTE

Failure of the control head fuse is usually

the result of a shorted control head cable, or

the control head cable was damaged during

installation. Ensure that the cause of F1’s

failure is located and repaired before reapply-

ing power to the unit.

E. Replacement of Output Transistors.

Failure of one or both of the output tran-

sistors (Q3, Q4) is usually the result of a defective

speaker (short circuited voice coil). Rebroadcast of

unsquelched radio or music for long periods will also

have a detrimental effect on the output transistors,

and is therefore not recommended.

Federal recommends that both output tran-

sistors be replaced should only one device prove to

be defective. This practice will ensure long periods of

service between failures.

Before installing new output transistors,

check the ampliﬁer fuse (F1 on the relay circuit

board).

Install the insulators between the chassis

and transistors.

Before installing the repaired unit, use an

ohmmeter to check for continuity between the chassis

and each output transistor’s collector (case of transis-

tor). There should be NO CONTINUITY between the

chassis and the output transistors’ collectors (case of

transistor).

6-3

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Vision Fitness R44 Specifications Page 26

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