Ampeg_SVT-CL_Fault_Mode_Service_Note.pdf

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SLM Electronics

A Division of S t. Louis Music, Inc

11880 Borman Dr

S t. Louis, MO 63146

Phone 314 569 0141

Fax

# CSB0001

S ervice Department

Phone 800 738 7563

314 567 7278

Customer Service Bulletin

January, 1997

Units Affected:

Model

SVT-CL

SVT-CLJ

SVT-CLW

Concern:

Some units may unnecessarily trip the protection circuitry and cause the unit to go into “fault” mode

(i.e. flashing red and green power LED).

S erial Number

prior to TCLDJ10001

prior to TCLJJ10001

prior to TCLWJ10001

Model

SVT-2PRO

SVT-2PROJ

SVT-2PROW

S erial Number

prior to T2PDJ10001

prior to T2PJJ10001

prior to T2PWJ10001

Corrective Action:

Install a .1 mfd/50V capacitor (part # 10A104-01) on the power amp board, as shown below.

Note:

This Customer Service Bulletin (CSB) should be done in addition to the one released in M arch

1995 which added back to back diodes to the power amp input and also changed the gain resistor (R1

audio output PCB) to a 68K 1/4W. For reference the diodes are shown on the figure below. All future

runs of these models will incorporate this update.