Denon POA 8000 Service Manual

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D E N O N I-Ii-FiComponentAmpIifier

SERVICE MANUAL
MODEL PDA- 800:)

MONAURAL POWER AMPLIFIER

CONTENTS
SPECIFICATIONS .............................................. ' . . 1
BLOCK DIAGRAM ................................................ 1
METHOD OF ADJUSTMENT ...................................... 2 ~ 4
PRINTED CIRCUIT BOARD PATTERNS AND PARTS LIST
DRIVE UNIT ETC-422 ........................................ 5 ~ 7
CANCELER UNIT ETC425 ....................................... 8,9
METER LAMP UNIT ETC-4284, LAMP (R) ETC-428-2, LAMP (L) ETC-4273 ...... 9
POWER OUT (A) UNIT ETC-423 .................................... 10
POWER OUT (B) UNIT ETC~424 ................................... 10,11
METER 81 PROTECTOR UNIT ETC-426 .............................. 11,12
INPUT UNIT ETC427-1, RELAY UNIT ETC~427-2, LED UNIT ETC-429 ......... 13
POWER SUPPLY UNIT SUX-028 ................................... 14,15
TROUBLESHOOTING ........................................... 15
WIRING DIAGRAM ............................................... 16
EXPLODED VIEW OF CHASSIS AND CABINET ........................... 17
PARTS LIST OF EXPLODED VIEW .................................... 17

NIPPON COLUMBIA 80., LTD.

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SPECIFICATIONS
POWER AMPLIFIER SECTION CHARACTERISTICS DIGITAL DISPLAY FUNCTIONS
Music Output: (3 ohm load) . . .320W Muting Display: Counting down from Initial value 7 to 0
Rated Output: (Sinusoidal Output 20 Hz to 20 kHz) Speaker Display: sp1 or 5P2
A - - 200 W / 3 Ohm Self-Diagnostic Function: Diagnostic functions for main and distor.
Total Harmonic Disturtiun tiun elimination circuits; and for ab.
Factor: 20 Hz to 20 kHz : ..0.003% normal high temperature inside the unit
200 Watts at 8 ohms 20 Hz ~ 20 kHz GENERAL
with no More Then 0.005% Total Powar Source: AC 220 V, 50 Hz (Germany and France)
Harmonic Distortion (U.S.A.) AC 240 V, 50 Hz (U,K.)
Input Sensitivity/ AC 120 V, 60 H2 (U.StA.)
Input impedance: 1V / 50 k ohm AC 200 V, 50 Hz (Hong Kong)
Output Impedance: 0.1 ohm Power Consumptinn: In nonsignaling generation, 160 W
S/N Rati 120 dB (lHF "A) 370 W (U.S.A.) _
Transmission VA (Canada)
Characteristic: 1 Hz to 100 kHz*1de 820 w (at maximum output)
Subsonic Fm." _ Dimensions: 310 (W) x 188 (H) x 462 (D) rnrn
Characteristic: 16 Hz 6 dB/OCT (including knob heights and leg height)
Slew Rate: :380 v/usec Weight: 22 k9
LEVEL METER CHARACTERISTICS
Type of Indication: Output level peak indication (with rated
peak output holding display function) Specifications are subject to change for further improvements
Indicating Range: 750 dB to +5 dB = 200 W / 8 ohm without notice.

frequency Characteristic: 10 Hz to 100 kHz :3 dB 1

BLOCK DIAGRAM

NOTE: The following codes correspond to the appropriate models.
E3 for U.S.A., EC for Canada, E2 for Europe, EF for France, EG for Germany, EK for U.K., E1 for Hong Kong.
This Service Manual is prepared based on E3.

Subsonic liirei

SOeakel l

First stage
input aitierential
amplifier

L

+
Distortion ellmlflallon ClICUli
(Voltage amplification statei

i>D

Distortion elimination circuit

PIErdHVE Power
stage stage

Speaker 2

- Real bias :
circuit

Meier
anoiiiier

Meter

D=rorciaai
ranstorn-ier

Power Source

(power siege) Stabilizmg
DOWEV :1 l O V
Stabilizing
w
/ -

RECT

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- PDA- 8000

b) Increase input signal level so as the output level indicates 40V. Then adjust VR2 of meter PCB assembly ETC-0426
so as the meter indicates OdB.

c) Adjust lighting level of peak indicator LED with VRl of meter unit ETC-0426. Adjust VRl slowly so as the LED
turns OFF -> 0N (quickly brighten).

.<-LED
e3 0 +3 +5
///////

d) Set ATT to --10dB, and check meter indicates -1011.5dB.
e) Set ATT to -20dB, and check meter indicates -20i3dB.
f) Set ATT to -30dB, and check meter indicates -30t3dB.
9) Set ATT to -40dB, and check meter indicates -40:3dB.
5. Non-load Detector Circuit Adjustment
a) Set output level to 20V/1 kHz.
b) Push Speaker selection switch to select SP-2 (non-load state). Adjust VR»3 of meter unit ETC-0426 so as 3 Relay of
Distortion eliminator circuit ETC-0425 actuates after 3 seconds.

<--- VHS non

N
Ifi <- VFl2 rated output indicator LED level adjustment

E <_ VRl meter pointer adjustment
PCB component side >

[3] Distortion Adjsutment must be done after the service finished
0 Preparation

1. Detach top cover glass and ventilator.

2. Detach both left and right side panels.

0 Setup
1. Set each switch as per

Front panel Power switch -> OFF
Speaker switch -> SP-l
Meter switch -> Luminous side

Back panel Subsonic switch -> OFF
Main volume contro|-> MIN.

Terminate SP-l terminals with 8 ohm resistor load, and apply generator output to input terminals.

. Connect Distortion meter across the 8 ohm resistor.

4. Couple a current proble sensing terminal to current probe test terminal of Distortion eliminator circuit assembly

ETC-0425.
lfifilfl Generator

.0} '

db 00

we

VTVM.

O 0
El
SPEAKERS
F11 l' 'l
O P 0 O I-6
Oscilloscope

8 ohm resistor

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