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MODEL PM243/143 STEREO PRE MAIN AMPLIFIER
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SMODEL #263
INTRODUCTION
This service manual was prepared for use by Authorized
Warranty
Stations
and
contains
service
information
for
the Marantz Model PM243/143 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.
2. FUNCTION OF EACH PART:
(1) TREBLE/BASS/MIDDLE
SWITCH
1. P.W. BOARDS|
As
can be seen from the circuit diagram
the chassis of
Model PM243/143 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.
:
4. Main Amp .........
mounted
on P.W. Board P700
2. Power Switch.......
mounted
on P.W. Board PGOO
3. Indicator.......... mounted on P.W. Board PSOO
4. 16P Connector ......
mounted
on P.W. Board PVQOO
5. 6P Connector.......
mounted on P.W. Board PV50
100 Hz +6 dB, 1 kHz +4 dB, 10 kHz +3 dB.
(2) POWER AMPLIFIER
_For voltage amplifier, monolithic
IC uPC1270H
| covering as far as the driving step is used; and for. the final step,
(3) MUTING/LIMITER
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