Marantz PM351 - Page 9

MODEL PM440 STEREO PRE MAIN AMPLIFIER
BOR GR Roun mate
INTRODUCTION
- This. service manual was prepared for use by Authorized
Warranty Stations and contains service information for
the Marantz Model PM440 Stereo Pre Main Amplifier.
Servicing information and voltage data included in’ this
manual are intended for use by knowledgeable and ex-
‘ perienced personnel only. All instructions should be read
--carefully,.No attempt should. be made to proceed without
|. a good understanding of circuitry operation.
The parts. list furnishes complete ordering information.
Most replacement. parts should be ordered’ from the
Marantz Company. However, a simple description is in-
cluded for parts which can be obtained locally. ©
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
Model PM440 consists of the following units. Each unit
mounted on a printed circuit board is discribed within
the square enclosed by a bold dotted line on the circuit
_ diagram.
1. Main Amp. ........ mounted on P.W. Board P701
"2. Volume............ mounted on P.W. Board PEO1
3. Speaker Switch .:... mounted on P.W. Board PNO1 -.
4. Power Switch. ...... mounted on P.W. Board PPQ1
5. Headphone Jack ..... mounted on P.W. Board PWO1 |
6. Speaker Lamp ...... mounted on P.W. Board PX01