Denon PMA-830 User manual

[) EF N C) N Hi-Fi Component Ampiifier
SERVICE MANUAL
MODEL PMA-830
| SOLID STATE STEREO
INTEGRATED AMPLIFIER
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TABLE OF CONTENTS
SPECIFICATIONS Gaixtacte esa dine sd bid id ew Go Eee ee eeees Sete en ness 1
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EXPLODED VIEW OF CHASSIS AND CABINET
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METHOD OF ADIUSTMENTS soiree scr ia ead eck oeee nee ecdewd eee oeueetues 5
PRINTED CIRCUIT BOARD PATTERNS AND PARTS LIST
INPUT TERMINAL UNIT SE O2y <c Sa ne 6
CONTROL (A) UNIT $ MENG 2508 atoning Aeneas ae ese e 6
CONTROL (B) UNIT E162 siete hes tabs ee es 9
POWER SOURCE AND PROTECTOR UNIT ETC-280........ 0.000 cece eee eee eee 10
POWER AMP UNIT BUX 0205.35 226 deve Sulnne enous enn butnts 11
WIRING DIAGRAM «4 2.02453, peeaw as ce cadn deren dade ich one Posie sees s 14

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SPECIFICATIONS
MAIN AMPLIFIER SECTION
Type:
All stages pure complementaly
push-pull system DC circuit
Rated Output (both channels driven)
20 Hz to 20 kHz (at 8 ohm)
Class B operation:
Class A operation:
65 W at each channel (T.H.D.
0.01%)
15 W at each channel! (T.H.D.
0.005%)
1 kHz (at 4 ohm, T.H.D. 0.02%)
Class B operation:
Total Harmonic Distortion
Class B operation:
Class A operation:
{intermodulation Distortion
60 H2/7 kHz = 4/1:
Power Bandwidth
Class B operation:
Class A operation:
Transmission Characteristic:
Input Sensitivity :
Input impedance:
Output Impedance:
Signal to Noise Ratio:
Output Terminals
Speaker:
Headphone:
90 W at each channel
less than 0.01%
less than 0.005%
less than 0.01% (at equivalent
rated output)
less than 0.01% {at 1 watt output)
5 Hz to 80 kHz (IHF, T.H.D.
0.05%)
5 Hz to 100 kHz (IHF, T.H.D.
0.05%)
DC to 100 kHz “0 dB (at 1 watt
output}
1 volt r.m.s.
50 k ohm
less than 0.16 ohm
122 dB
A & B, 4to 16 ohm Joad
A+8B,8 to 16 ohm load
for Stereo Headphone
PRE AMPLIFIER SECTION
Pre Amplifier Output
Max. Output:
Rated Output:
Total Harmonic
25 V
1V
Distortion: 0.003% {at 3 V output)
Equalizer Amplifier Output
Max. Output: 25 V (T.H.D. 0.01% at 50 k ohm
load)
Rated Output: 320 mV
Input Sensitivity/input Impedance
Phono-1, 2: 2.5 mV /50k ohm
Tuner: 320 mV /40 k ohm
Aux. Tape: 320 mV / 40 k ohm
Maximum Allowable Input
Phono: 200 mV 1 kHz
RIAA Deviation: less than +0.2 dB (20 Hz to 20 kHz)
Signal to Noise Ratio (IHF. A network)
Phono: better than 90 dB {input terminal
shorted}
Tuner, Tape, Aux: better than 105 dB (input terminal!
shorted)
Aux — Pre Out Frequency Response
5 Hz to 100 kHz ~
Tone Control Section Variable Range
100 Hz +8 dB
10 kHz +8 dB
0
, 28
Tone Defeat:
Bass:
Treble:
Filter Characteristic
20 Hz, —6 dB/oct
Loudness Control Characteristic
100 Hz+7 dB
10 kHz2+6dB
AC 220V, 50 Hz
440 W (at max. output power)
Subsonic:
Low range:
High range:
Power Source:
Power Consumption:
Dimensions: 434 (W) x 164 (H) x 400 (D) mm
17-5/64" (W) x 6-29/64”" (H) x
15-3/4" (D)
Weight: 16 kg, 35.3 Ibs
These contents are subject to alteration without prior notice.

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EXPLODED VIEW OF CHASSIS AND CABINET
FRONT SIDE

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CHASSIS AND CABINET GROUP PARTS LIST
Part Name & Descriptions Part Name & Descriptions
477006411
07
|
FIXING
SCREW
4110145204
|
CONTROL
BRACKET
(A)
; 4730353 TAPPING SCREW 3 x 6 (2) = 4610061121 | RUBBER SHEET
3
4110148502
|
SIDE
CHASSIS
59
2740037014
|
2SD427
(R)
or
(O)
TRANSISTOR
4
4140114205
|
SHIELD
COVER
60
4120372106
|
RADIATOR
BRACKET
(A)
5 4610074176 | BLIND 61 4711809033 | CROSS PEN SCREW 3 x 18
6
2120119002
|
SPEAKER
SWITCH
62
4753001051
|
3
TOOTH
WASHER
i 2558001007 | OIL CAPACITOR 0.01uF 63 2720024005 | 2S8557 (0) TRANSISTOR
8
3930032019
|
PILOT
LAMP
6.3V
0.15A
64
INSULATING
SHEET
g 2124122008 | POWER SWITCH 65 4170077105 | POWER RADIATOR
10
4110144409
|
FRONT
CHASSIS
66
4120373105
|
RADIATOR
BRACKET
(B}
11 — — 67 MD-4232 WIRE CLIP
12 _ — 68 4110147309 | MAIN CHASSIS
13
ADHESIVE
TAPE
69
2546031007
|
6800uF
50
V
CAPACITOR
14 BLIND 70 2050095102 | EARTH PLATE
15 4730354035 | TAPPING SCREW3x8 71 2P CONNECTOR
16 1440375103 | FRONT PANEL ASS. 72 4450020005 | CORD BUSH
17 1120161006 | KNOB ASS. 73 2062016001 | AC CORD
18 BLIND SHEET 74 4610061118 | RUBBER SHEET
19
_
—
75
1050294001
|
BACK
PANEL
20
4711304033
|
CROSS
PAN
SCREW
3
x8
76
2070002007
|
TRANSISTOR
SOCKET
21 11
mm
NUT
ie;
PUX-020L
POWER
AMPLIFIER
UNIT
(L)
22
2048011101
|
HEAD
PHONE
JACK
78
3P
CONNECTOR
CORD
23
4110146106
|
CONTROL
BRACKET
(B)
73
—
—
24
1120160007
|
KNOB
ASS.
80
4140113002
|
INPUT
BRACKET
25
1120162209
|
KNOB
ASS.
81
ETC-143
INPUT
TERMINAL
UNIT
26 1120166108 | LEVER KNOB 82 — —
27
1430041007
|
PILOT
LENS
83
2020012005
|
FUSE
HOLDER
28
SC-1162
SPECIAL
SCREW
84
2061015087
|
FUSE
4.0A
TIME
LAG
29
1020063440
|
TOP
COVER
85
_
-
30
1220007057
|
SPACER
86
2335127009
|
POWER
TRANSFORMER
31
ETC-259B
CONTROL
(A)
UNIT
87
2050003000
|
3
T
LUG
TERMINAL
32
—
—
88
4752006002
|
6
mmS
WASHER
33
2110161109
|
100
k
ohm
x
2
POTENTIOMETER
89
4756012005
|
6
mm
NUT
34
2110162001
|
100
k
ohm
x
2
POTENTIOMETER
90
ETC-280
POWER
SOURCE
&
PROTECTOR
UNIT
35
2120114007
|
ROTARY
SWITCH
91
1P
CONNECTOR
ASS.
36
2120115019
|
FUNCTION
SWITCH
92
4P
CONNECTOR
CORD
37
2120127007
|
FUNCTION
SWITCH
93 3P
CONNECTOR
CORD
38
2110160100
|
50
k
ohm
x
2
POTENTIOMETER
94
2038004005
|
5P
CONNECTOR
CORD
39
8
mm
NUT
95
3P
CONNECTOR
CORD
40
7mm
NUT
96
2050070004
|
8P
TERMINAL
41
7mm
TOOTH
WASHER
97
2056037005
|
SHORT
PIN
42
9
mm
NUT
98
4770088002
|
4.1
mm
WASHER
43
9
mm
TOOTH
WASHER
99
2050043109
|
GND
TERMINAL
44
1050188405
|
BOTTOM
COVER
100
_
—
45
2124110007
|
LEVER
SWITCH
101
4140057207
|
BOARD
BRACKET
46
2120118003
|
ROTARY
SWITCH
102
2036043000
|
4P
CONNECTOR
BASE
47
2120117004
|
ROTARY
SWITCH
103
—
2034093052
|
3P
CONNECTOR
CORD
48
2124110010
|
LEVER
SWITCH
104
PUX020R
POWER
AMP
UNIT
(R)
49 2110163107 | 100 k ohm x 2 POTENTIOMETER 105 = a
50 4700009006 | CROSS PAN SCREW3 x6 106 = =
51 4P CONNECTION CORD 107 a -_
52
ETC-277
CONTROL
(B)
UNIT
108
2030014048
|
1P
CONNECTOR
ASS.
53
1120163208
|
KNOB
ASS.
109
MD-5271
P.C.B.
SUPPORT
54 1040040003 | FOOT 110 MD-4368 WIRE CLIP
55
4730456014
|
TOPPING
SCREW
4
x
12
(2)
111
4753100004
|
4
mm
TOOTH
WASHER
a
56
7mm
NUT
112
4770006004
|
4mm
NUT
4410316005 | DIN PLATE
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METHOD OF ADJUSTMENTS
DC VOLTMETER DC VOLTMETER
L-CHANNEL
DS {DIODE}
TRIZ0
(TRANSISTOR)
CONTACT WITH DIODE AND TRANSISTOR
VR5 VR3
(VR 6) (VR 4)
R-CANNEEL
TR 13,D9
{TR 14, D 10)
SYSTEM-A = 210
TEST POINT
SYSTEM-B meee
PUX-020 POWER AMP. UNIT SPEAKER TERMINALS
DATA FOR ADJUSTMENTS
1. Confirm that forming has been effected as shown in the drawing for D9 and TR13, and D10 and TR14, respectively of
the L- and R-channels. (PU X-020)
2. The amplifier switchs should be set as follows:
(1) SPEAKERS switchs to “A” system.
(2) VOLUME to minimum position.
(3) DIRECT COUPLE to OFF.
(4) POWER switch to OFF.
(5) OPERATION switch to “B” position.
(6) Confirm that a U-sharped short pin is inserted between the PRE-OUT and MAIN-IN terminals.
3. {1} Connect a D.C. voltmeter to the SYSTEM-A terminal.
(2) Connect a D.C. voltmeter to the test points of both the L- and R-channels of the PUX-020. Special attention should
be paid here with regard to the polarities of the test point voltages: make sure that 16 is — and 17 + for the L-chan-
nel, and that 35 is — and 36 + for the R-channel.
4.(1) After setting the voltage regulator to 0 V, switch the amplifier’'s power switch on.
(2) While ovserving the indication of the D.C. voltmeter, raise the power supply voltage from zero to the rated voltage
by using the voltage regulator, and carry out the preliminary adjustments of (3) and (4) in a swift manner.
(3) By adjusting VR1 (L-channel) and VR2 (R-channel) of the PUX-020, regulate the speaker terminal voltage to the
ih range of OV +10 mV.
(4k By adjusting VR5 (L-channel) and VR6 (R-channel) of the PUX-020, regulate the rest point voltages to 12 mV (10
to 14 mV) [Collector current to 26 mA (22 to 30 mA)].
5. (1) On completion of the preliminary adjustments described above, carry out the main adjustments described below.
(2) “ By adjusting VR1 (L-channel) and VR2 (R-channel), adjust the speaker terminal voltage again so that it will be in
the range of OV +10 mV. |
(3) “Adjust VR5 (L-channel) and VR6 (R-channel) again, regulating the test point voltage to 17 mV_+1 mV (Collector
current to 26 mA +2 mA).
(4) With the above adjustments, the speaker terminal voltage adjustment and idling current adjustment for B-class
operations have been completed.
6. (1) Change over the OPERATION switch to Class A.
(2) By adjusting VR3 (L-channel) and VR4 (R-channel) of the PUX-020, carry out adjustment of the test point voltage,
regulating it to 470 mV +10 mV (Collector current to 1 A +0.02 A).
7. (1) Switch over the OPERATION switch and effect aging for 10 minutes.
(2) By adjusting VR3 (L-channel) and VR4 (R-channel) of the PUX-020, regulate the test point voltage to 500 mV__
f. +5 mV (Collector current to 1.06 A +0.01 A). With the above operations, idling current adjustment for A-class.
operations has been completed.
CAUTION
1. Never switch off power until the idling current adjustments for Class-A operations have been completed.
2. Special attention should be paid in handling the variable resistors used for adjustments, i.e., VR3 and VR4, and VR5
and VR6, as they can be easily mistaken for one another.
lf by mistake, VR5, or VR6 has been used for the idling current adjustment for A-class operations, readjustment must
be carried out (after confirming that the radiator of the power amplifier has cooled down) for B-class operations, since the
mistake will cause a deviation in the adjustment for B-class operations. On completion of this, carry out adjustments for
A-class operations again.
3. The adjustment of 6. (2)’’ should be effected after about 10 seconds have passed following switch-on of the OPERA-
TION switch.
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INPUT TERMINAL UNIT
PRINTED CIRCUIT BOARD PATTERNS AND PARTS LIST
INPUT TERMINAL UNIT ETC-143
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ETC-143 PARTS LIST
RESISTORS, CAPACITORS
2410378003
2531027000
2551088003
OTHER PARTS
2220560001
2048009003
2048007005
2040055000
2038058019
2038058006
2038059005
4450033005
2040046006
4140113002
MD-5271
+5%
+80,—20%
+10%
470 k ohm
0.1uF
0.22uF
P.C. OCARD
1P JACK
1P JACK
6P CONNECTOR
5P CONNECTOR
5P CONNECTOR
5P CONNECTOR
WIRE CLAMP BAND
5P PIN SOCKET
INPUT BRACKET
P.C.B. SUPOORT
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Part Name & Descriptions
FOR PHONO
FOR REC1,2
FOR TUNER
FOR TAPE R
FOR TAPE L
FIXED CARBON FILM RESISTOR
FIXED CERAMIC CAPACITOR
FIXED PLASTIC FILM CAPACITOR
, TUNER, AUX, P.B.
, AUX
FOR OHONO 1, 2
USED 6
USED 6
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CONTROL (A) UNIT ETC-259B-1, -2, -3
(1) TONE UNIT
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TRI7,18, 21,22: 25C1000(GR) aca 2nFRIG:20:2SA7261F) TR2S,
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95.022 .
Res | ——1688.922 TR27,28: 25C2089 (BL) i
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CONTROL (A) UNIT
(2) EQUALIZER AMP UNIT
CONTROL (A) UNIT
(
ETC-259B-2)
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