Denon PMA 757 Service Manual

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DENON

] NIPPON COLUMBIA CO, LTD "

SERVICE MANUAL
MODEL PMA-777/ 757

SOLID STATE
PRE MAIN AMPLIFIER

PMA-7 77

UIS.A. Version Ony

PMA-7S7

Asia Version Only

CONTENTS
SPECIFICATIONS .............................................. - ................... 2 ~:
CONTROLS AND FUNCTIONS ..................................................... x
CONNECTIONS ................................................................. 5
METHOD OF ADJUSTMENT ....................................................... 5~7
BLOCK DIAGRAM ............................................................... E
SEMICONDUCTORS ...................................... , ........................ 9

PRINTED WIRING BOARD PATTERNS AND PARTS LIST
P.S & PROTECT UNIT ETC-0740, 07408 ...................................... Io~ 11, IT
INPUT 8: EO. UNIT ETC-0739, 07395 ................................... I2~13.18~19
TONE & POWER UNIT ETC-D738, 07388 ................................. 14~15,20~2l
CONNECTION DIAGRAM .......................................................... 15,22
WIRING DIAGRAM ............................................................... 23,25
EXPLODED VIEW OF CHASSIS AND CABINET ....................................... 24,26

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g

_ PlVIA-777/7b7

RISK OF ELECTRIC SHOCK
DO NOT OPEN

CAUTION: TO REDUCE THE. RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (DR BACK). N0
USER SERVICEABLE PARTS INSIDE. REFER SERVIC'
ING T0 QUALIFIED SERVICE PERSONNEL.

The lightning Ilash with arrowhead symbol within an equilateral triangle
is intended to alert the user of the presence of uninsulated "dangerous
voltage" within the products enclosure that may be of sufficient magni-
tude to conttitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert
the user of the presence ol important operating and maintenance (servic-

ing) inxtruction in the literature accompanying the appliance.

WARNING: TO PREVENT FIFIE OR SHOCK HAZARD.
DO NOT EXPOSE THIS APPLIANCE T0 RAIN OR MOISTURE.

WARNING:

1. Component pant

Parts marked with (it and/or shading in Ihrx service manual have special characteristics important to safety. Be sure to use
the specified pans for replacement.

2 Leakage current

Before returning the appliance to customer, test the Ieakage current when the power plug is connected. Use a calibrated (wiih

an error oI not more than 5%) leakage current tester and measure the leakage current from any exposed metal to the earth
ground. Reverse the power plug polarity and test the above again.
Any current measured MUST NOT EXCEED 0.5 miliamps, Corrective measure must be taken if it exceeds the limit

SPECIFICATIONS
- PMA'777

POWER AMPLIFIER SECTION

Rated Output Power:

Tat-l Harmonie
Distortion:

lntnrmoduhtion
Dirtonion:

IOutp-n samurai:
. Tammi-km
Characteristic:

Bath channel drives (TUNER -' SP OUT)
100 Watts minimum rrns per channel

(8 ohm Load) with )ess than 0 07% total
harmonic dillortion lrom 20 Hz to

20 )(HI.

I20 W + I20 W (4 ohm Load)

20 Hz to 20 kHz It T.H.D 0.05%

(It)! U.S.A,)

IkHz (4 ohm Load) 150W+ ISOW
lDlN. T.HAD 1%)

I kHz (4 ohm Load) 30 W1 10 W IIEC
Subject to change by temperature tett.l
Ilor outtide U.S.A.)

0.003% (20 Hz - 20 kHz al 3 dB rated
output 8 ohm Load)

0.02% I20 Hz a 20 kHz It rated output
8 ohm Load) lU.S.A.)

Below 7 kHz/60 Hz: (/4 0.002% (at
amplitude output aquiveIent to rated
output)

5 Hz -- m kHz (IHF T.H.D 1103*)

I Hz- 250 kHzgdB [It I WoulWl)

Input Sensitivity:
Input Impedance:

~.. .
Output Impsdam;

Output Termituis:

ISO mV
47 k ohm
0.08 ohm It kaI

Speaker: A or 3 Load 4 - 15 ohm

A+BLOadB-l$ohm

Headphone/Stereo headphone (390 mW/

80hr")

EQUALIZER AMPLIFIER SECTION

Equalilor Amplifier
Output:

Input Smnitivily/Iflput
Impodlnca:

HIAA Deviation:

Maximum Output: 12 V lat 47 k ohm
Load)

ted Output: 150 rnV
gal harmonic distortion: less than

.002% (It I kHz,8 V output)

FHONO-l. 2 MM 25 mV 7 It ohm

MC ZOOuV 100 ohm

TUNER 150mV 47 kohm
DAD. VIDEO/AUX. TAPE

150 mV 47 Is ohm

PHONO-I. 2_,MM within :01 dB
(20 Hz - 100 kHz)
within $0.2 dB
(20 H! - 100 kHl)

MC

HFA Network):

Tone Control Adjust-bl:
Range:

Fillting Qmmtorinia:
Loudness Characteristic:

AC OUTLET:

PHONO-I, 2
MM 5866 (input terminals short-
cirmited Ior 1.5 mV input)
MC 72 dB Iinpul terminais short-

:ircuited lot 250 uV input)
TUNER. TAPE. DAD, VIDEO/AUX:
llD all (input terminal: thon-

circuitedl
BASS 100 H1 :8 dB
TREBLE 1|)ka :5 dB

SUBSONIC 20 Ht, 6 dEI/oct
Lmvlrequency 100 Hz+7dB
High Irequency IO kHz v 6 of!

(For u.s.A.. Can-d- Ind

Am)

0 PMA~757

POWER AMPLIFIER

fii Rat-d Output Power:

I

Tot-I Harmonic
Dlslortion:

lntormoduletion
Dinortion:

Output Bandwidth:
Transmission
Charon-finite:
Input Sensitivity:
Input Impodlnu:
Output lmpfidancet
Output TWmimls:

SWITCHED x 1, 100W (Total)
UNSWlTCHED x l, 250 W

SECTION

Both channel drives (TUNER 5? OUT)
so Watts minimum Ims per channel

(8 ohm Load) with less than 0.02% total
harmonic dittortion lrom 20 Hz to

20 km.

IDO W +100WI4 ohm Load)

20 Hz to 20 It) at T,H.D. 0.05%

Ilor USA.)

)kHl (dohm Load) IIOW+ (TOW
(D|N_ T,H_D 1%)

I kHz (6 ohm Load) 30 W t 30 w

(IEC, Subject to change by temperature
test.)

(Ior outside U.S.A. and Canada)

0.005% (20 H1 - 2O kHl at -3 :18 rated
DuKDul 8 ohm: Load) 0.02% (20 HI --
20 kHz at rated output 3 ohm Load)
IU.s,A.) '

Below 7 kHz/60 H1 :1/4 0.003% (It
amplitude output equivaient to rated
output)

5 Hz - 30 kHz IIHF T.H.D 0.03%)

1H: - 200 kHz 3:15 (at 1 w output)

150 mV

47 1: ohm

0.06 ohm (l kHz)

Speaker: A or 5 Load 4 - 16 ohm
A+6Load8-160hm

Heapdhone/Stereo headphone (310 mW/

Bonm) -

EQUALIZER AMPLIFIER SECTION

Equalixk Ampnnu
Output:

Input Sensitivity/Input
Impodma:

Maximum Output: 12 V (at 47 k ohm
Loadl

Rated Output: lSO mv

Total harmonic dittortion: lest than
0.002% (II I kHz, 8 V output)

PHONO MM 2.5 «IV 47 k ohm
MC 200yV 100 ohm
TUNER ISOmV 47kofnn

DAD, VIDEO/AUX, TAPE
ISO mV 47 k ohm

NOTE: The following code correspond to the appropriate models.
E2 (or Europe. E1 for Asia, E3 (or U.S.A., EK (or U. K.. EA (Of AUSUB'IZ and EC (0! Canada.
This Service Manual is prepared based on E2 Gold Version.

-3-

PMA-777/757- _

Germrw and France AC no v, so He:
UK. and Australia AC 240 V, 50 Hz:_
U.S.A. AC 120 V, 60 Ht; Asia lI0/120/
220/240 V, 50/60: lMultiple)
POWER CONSUMPTION: 245 W (U.S.A.),' 250 W (IEC): 220 W
(Multiple) 600 W Maximum Output

POWER SOURCE:

DIMENSIONS: 470 mm tta-t/z"lw x 135 mm
l5-1I/JT'IH x 413 mm (lG~l/4"l0
(with Wood Board)
434 mm (17-5164")?! x 135 mm
(swarm x .3 mm llE-I/4")D
(without Wood Board)
(including rubber rm. control knobs,
and terminals.)

WEIGHT: 12.5 kg (271m 9 oz) Iwiih Wood Board)

11.5 kg (25 lbs 6 or) (without Wood
Board)

Design and specifications are subject to change without prior notice.

PHONO MC within 20.3 dB

(20 Hz - IOO kHz)

RIAA DNiltian:

OVERALL CHARACTERISTICS

SN Ratio
IIHFA Network): PHONO
MM 87 d8 (inout terminals xhcrt- ,
circuited (or 2.5 mV input)
MC 70 dB (input terminal: xhort- ~

circuited Ior 250 uV input)
TUNE, TAPE, DAD, VIDEO/AUX:
110 dB Iinput terminalr short-

UNSWITCHED x 1. 250 W
Germany and France AC 220 V 50 Hz:
UtK. Ind Auttralia AC 240 V. 50 HI:
U.S A, and Canada AC )20 V. 60 H1:
Asia 210/120/220/240 V, 50/60 Hz
(Multiple)
POWER CONSUMPTION: 715 W (U.S.A.); 500 VA (Canada);
240 W llEC): 190 W (Multiple): 650 W
Maximum Output

POWER SOURCE:

circuitedl !

Tone Control Adjustable '3
Range: BASS too Hz :a as 9
TREBLE IOkHr :BdE 3

Filtering Char-meriniu: suasomc 20 H1. 6 dBIoct :
Loudness Charactnistiu: Low frequency too Hz . 7 as 3
High (requency 10 kHz 0' 6 65 a)

AC OUTLET: {I
(For U.S.A., Canada ma l5
Asia) SWITCHED x 2, I00 w (Tatil) E

DIMENSIONS: 470 mm (18-1/2")W I 135 mm
(511/32")H x 41] mm llS-I/V'ID
(with Wood Board)
434 mm (l7-5l64"IWx 135 mm
(51 1/32"le 413 mm (16-1/4lu
lwithout Wood Board)
(including rubber Ieet. control knobst
and terminals.)

WEIGHT: 1: kg (23 be 11 oz) (with Wood Board)

I2 kg (26 lb: 7 all (without Wood
Board)

10.5 kg (23 lbs 2 oz) (without Wood
Board) (Far U.S.A. 54 Canada)

Deng» and specilicaticnt are subject to change without prior noticz.