Marantz PM 84 Mk2 Schematic 2

Page 1

Marantz PM-84 ||

2. TEST EQUIPMENT REQUIRED FOR SERVICING

This table lists the test equipment required for servicing the Model PM»84II Stereo Amplifier.

Item

Use

Distortion Analyzer

Distortion measurements

AUdio Oscillator

Sinewave and squarewave signal source

AC VTVM

Voltage measurements (AC)

Oscilloscope

Waveform analysis and trouble shooting and A50 alignment

Circuit Tester

Trouble shooting

DC VTVM

Voltage measurements (DC)

AC Wattmeter

Monitors primary power to amplifier

Line Voltmeter

Monitors potential of primary power to amplifier

Variable Autotranstormer (0 ~ 140V AC, 10A)

Adjust level of primery power to amplifier

Shorting Plug

Shorts amplifier input to eliminate noise pickup

3. ADJUSTMENT PROCEDURE

Idling Adjustment

1.

With no signal and no load, short-circuit TP-5 and TNS
on the P.Wt Board (P701). -

. Connect the digital voltmeter at the DC range to the

center of the RL09 and RL13 (R L10 and RL14) cement
resistors on the P.W. Board (PL01) and adjust R727

(R728) on the P.W. Board (P701) for a voltage of 40 mV.

. Open TP-5 and TP~6 and adjust R725 (H726) on the

P.W. Board (P701) so that the digital voltmeter reads
112 mV.

.Next shortcircuit TPE and TP-7 and adjust R723

(R724) an the P.W. Board (P701) so that the digital
voltmeter reads 250 mV.

. Perform the same adjustment for the right channel using

the parts indicated in parentheses

Page 2

Marantz PM-84 ||

LOO!
Pwsl
P35I (JNOH

OEOSII/Z)

m
am

noon :xo/uv
rev Ila: wo-

nnz roo-

ozone/2)

um mo-

1qu one"
no:

no:
DIIEN JIDIJ

O 0
If; a": my: -
.

r | PGOI am.

.____ __J_____ not I; A

I l

I I
U

are:
u I vouw: I

town In

To J702

To 85l IGNDI

E
Ce

25Al3l6 (GR BL)
NJMTBMBA NJM79MI5A ZSCSSZSHSR BL)

ESCJZSBW. ZSAI306(O.YI

"SERVICE INFORMATION IS FOR USE BY QUALIFIED RERSONNEL ONLY -
ANY MISADJUSTMENT OR MISALIGNMENT MAY BE TREATED AS A NON-WARRANTY
REPAIR BY ANY MARANTZ SERVICE CENTRE - "

Kind of Common Parts

RESISTOR (P-fi; : ELECTROLY CAP. I t l / FILM CAP. I =l
B12 I1) 6005 - - - 140, Carbon film fixed resistor, 15% 1/4W (1) EA ...... 10, E|gmm|ytic condenser,
Bfi: (2) 6005 - - - 160, Carbon film fixed resistor, 15% WSW one-way lead type, tolerance 320%
n. : CERAMIC CAP. (2) DF15 - - - 350, Plastic film condenser.
(1] 001 - - - - 370, Ceramic condenser, one-way type, Mylar, $596 50V

disc type (titan condenser) .
Temp. coeff. P350~ N1000 50V 'In case of ordering the common parts, please establish the correct
parts number of 10 figures by the procedure "ASSIGNMENT OF

22 1 CERAM'C CAP- OMMON PARTS comes"
(1) DK16 - - < 300, High dielectric constant ceramic condenser, C
disc type (titan variable)

Temp. chara. 2B4 50V