Carver PM350 pwr sm

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PROFESSIONAL

PM-350
MAGNETIC FIELD POWER AMPLIFIER

SERVICE MANUAL

CONTENTS Page
I; SAFETY INFORMATION ............................................................. 3
2. INTRODUCTION .............................. 4
3. SPECIFICATIONS ............... .. ............

4. CIRCUIT DESCRIPTIONS ............

TEST PROCEDURE ....................................
SCHEMATICS AND LAYOUTS ............. -..
PARTS ORDERING ............................
PARTS LIST ....................................
VOLTAGE CONVERSION ........................... I

SERVICE BULLETINS .............................................................. 33

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SECTION 1
SAFETY INFORMATION

WARNING.

Any person performing the procedures described in
this manual will be exposed to hazardous voltages and
the risk of electric shock.

Carver Corporation assumes that any person who re-
moves the cover from the unit has been property
trained in protecting against avoidable injury and
shock

Therefore, the procedures described here are to be
performed by qualified (electronics service personnel
only.

We recommend that the unit be tested onlywhen line
isolation is provided by an isolation transformer. The
line cord of the unit must be disconnected and the
power supply fully discharged before any components
are replaced. Failure to do so may result in severe
damage to the unit and the risk of electric shock.

The safety tests described below must be performed
properly.

CAUTION:

Before returning the unit to the customer, one of the following safety tests must be performed.

1. Check the leakage current. Connect the unit to 120 VAC supply and tum the power switch ON. Using
an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the
unit under test. If leakage current exceeds 0.5mA, the unit is defective.

Reverse the polarity of the AC supply and repeat.

2. Measure the resistance from either side of the linecord to chassis ground. If it is less than 500k ohms, the

unit is defective.

WARNING - DO NOT return the unit to the customer if it fails one of these tests until the problem is located

and corrected.

CAUTION

RISK OF ELECTRIC SHOCK
DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL

The lightning llash with arrowhead symbol
within an equilateral triangle is intended to alert
the user to the presence of uninsulated
dangerous voltage within the products
enclosure, that may be otsutficient magnitude
to constitute a risk of electric shock to persons.

The exclamation pointwithin an equilateral
triangle is intended to alert the user of the
presence of important operating and main-
tenance (servicing) instructions in the literature
accompanying the appliance.