Marantz 74 EQ515 - Spectrum Analyzer

MODEL E0551 GRAPHIC EQUALIZER SPECTRUM ANALYZER
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INTRODUCTION
This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
Marantz Model EQ551 Graphic Equalizer Spectrum Analy-
zer.
Servicing information and voltage data included in this
manual are intended for use by the knowledgeable and ex-
perienced technician only. All instructions should be read
carefully. No attempt should be made to proceed without
a good understanding of the operation of the Graphic
Equalizer Spectrum Analyzer.
The parts Sist furnishes information by which replacement
parts may be ordered from the Marantz Company. A
simple description is included for parts which can usually
be obtained through local suppliers.
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1. SHOCK, FIRE HAZARD SERVICE TEST
CAUTION: After servicing this appliance and prior to
returning to customer, measure the resistance between
either primary AC cord connector pins (with unit NOT
connected to AC mains and its Power switch ON), and the
face or front Panel of product and controls and chassis
bottom.
Any resistance measurement less than 1 Megohms should
cause unit to be repaired or corrected before AC power is
applied, and verified before return to user/customer.
Ref. UL Standard No. 1270. Para. 66. 3. D (Mandatory
Test after servicing Electrical Appliances, effective 7-1-83).
2. P.W. BOARDS
As can be seen from the circuit diagram the chassis of
Mode! EQ551 consists of the following units. Each unit
mounted on a printed circuit board is described within the
square enclosed by a bold dotted line on the circuit diagram
1. Main ............ mounted on P.W. Board PE 15
2. Power Indicator ..... mounted on P.W. Board PL 15
3. Bar Drive/Volume.... mounted on P.W. Board PR15
4. Fl. Set nse ee cis mounted on P.W. Board PR25
5. Input Switch ....... mounted on P.W. Board PS§15
6. Display Switch ...... mounted on P.W. Board PS25
7. Power Switch....... mounted on P.W. Board PS35
8. MicAmp. ......... mounted on P.W. Board PV15
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