Smith-Root GPP 2.5 - Page 31

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GPP ELECTROFISHER
ADVANCED TROUBLESHOOTING
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• Turn generator off before troubleshooting.
• Open the generator end-bell cover by removing the two large
screws on the housing cover.
• Inspect the wire bundles for chaffing, loose or broken connections.
Repair if needed (See Fig. 3.1).
• Check brushes – replace brushes if
length less than 3/8” ≈(1 cm) (See
Fig. 3.2).
• Clean rotor slip rings with fine non-
metalic abrasive pad such as 3-M
“Scotch Brite” (See Fig. 3.3).
• Disconnect wires from rectifier. Check
3-pin rectifier with ohmmeter in diode
testing position. The rectifier should
only conduct one way between AC
and negative pin. Replace if shorted
between pins or if open between pins. (See Fig. 3.4 and inset).
• Correct problems, reassemble and retest using procedure 1 and 2.
AC
AC
Rectifier
Fig. 3.1
Fig. 3.2
Fig. 3.3
Fig. 3.4
PROBLEM: NO OUTPUT FROM GPP ELECTROFISHER (CONT.)
PROCEDURE 3: CHECK CONNECTIONS, BRUSHES, & EXCITER RECTIFIER
Slip Rings
If there is still no voltage at connector, continue to procedure 4.