Akai PR-A06 User manual

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STEREO PRE-AMPLIFIER
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PR-AQ6
DC
STEREO
POWER
AMPLIFIER
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PA=WO6

TABLE OF CONTENTS
SECTION 1 MODEL PR-AO6........
SECTION 2 MODEL PA-W06........
SECTION 3 PARTS LIST...........
SECTION 4 SCHEMATIC DIAGRAM .
PR-AO6
PA-WO06

SECTION 1
STEREO PRE-AMPLIFIER
MODEL PR-A06
ALSO APPLICABLE TO BLACK PANEL MODEL
TABLE OF CONTENTS
I = TECHNICAL DATA... 1. oe cee ee eet tenes 4
Il. DISMANTLING OF UNIT ..... 0... 0. ccc eee eee eee 5
I. CONTROLS ............. pad seca Cater alone eis rierer sia, 55 Beara sees a ye ake aie 6
IV. PRINCIPAL PARTS LOCATION ....... 0.0... eee ec eens 7
V. VOLTAGE CONVERSION ........ 0... cee etree 8
VIL -ADJUSTMENTD 2: a6 shoe beeen aE sna Bb sce ge 6 Ga Me braves RS ee ws 9
Vil. CLASSIFICATION OF VARIOUS P.C BOARDS .................06. 10
1. P.C BOARD TITLES AND IDENTIFICATION NUMBERS........... 10
2. COMPOSITION OF VARIOUS P.C BOARDS .................-.-. 11
For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL.

lI. TECHNICAL DATA
ee
A
ne
INPUT SENSITIVITY/IMPEDANCE/SIGNAL
TO NOISE RATIO (IHF “A”)
PHONO 1
PHONO 2
TUNER
AUX
TAPE PLAY 1/2
OUTPUT LEVEL/IMPEDANCE
TAPE REC 1/2
OUTPUT
RATED LOAD IMPEDANCE
PHONO MAX. INPUT LEVEL (1 kHz)
PHONO 1/2
FREQUENCY RESPONSE
TUNER/AUX/TAPE PLAY 1/2
PHONO 1/2 (RIAA curve deviation)
TOTAL HARMONIC DISTORTION
(20 Hz to 20 kHz)
TUNER/AUX/TAPE PLAY 1/2
(Volume Max.)
PHONO 1/2 (Volume Max.)
TONE CONTROL
BASS
TREBLE
SUBSONIC FILTER
CHANNEL SEPARATION (AUX)
SEMICONDUCTORS
POWER REQUIREMENTS
POWER CONSUMPTION
DIMENSIONS
WEIGHT
MM: 3 mV/33 k, 47k, 100 kohms/82 dB
MC: 0.08 mV/10 ohms/75 dB
MM: 3 mV/47 kohms/82 dB
150 mV/47 kohms/102 dB
150 mV/47 kohms/102 dB
150 mV/47 kohms/102 dB
150 mV/600 ohms
1 V/600 ohms
47 kohms
400 mV (MM)
5 Hz to 100 kHz + 0.5 dB
30 Hz to 15 kHz + 0.2 dB
0.005% at output 10 V
0.005% at output 10 V
+8 dB at 100 Hz
+8 dB at 10 kHz
12 dB/oct. at 18 Hz
70 dB (shorted circuit)
Transistors 29, Diodes 48, FETs 2, ICs 11
120 V, 60 Hz for USA and Canada
220 V, 50 Hz for Europe except UK
240 V, 50 Hz for UK and Australia
110/220/240 V, 50/60 Hz internally
switchable for other countries
U/T, AAL, CSA Models: 20 W
440 (W) x 78 (H) x 313 (D) mm
(17.3 x 3.1 x 12.3 inches)
6.3 kg (13.9 Ibs)
* For improvement purposes, specifications and design are subject to change without notice.

I. DISMANTLING OF UNIT
In case of trouble, etc. necessitating dismantling, please dismantle in the order shown in the photographs. Reassemble
in reverse order.
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1HU... 8 SS eC ss
x 35 eo
SCREWS
SCREWS
Sap
aa
SCREWS
FRONT PANEL
UPPER COVER

ON AARWN 3
CONTROLS
POWER SWITCH
BASS CONTROL
TREBLE CONTROL
FILTER SWITCHES
MODE SELECTOR .
LOUDNESS SWITCH AND !NDICATOR
LED dB VOLUME INDICATOR
VOLUME CONTROL
REMOTE CONTROL INDICATOR
INPUT SELECTOR INDICATOR
INPUT SELECTOR
PHONO SELECTOR
REC (Recording) SELECTOR
STEREO BALANCE CONTROL
15.
17.
18.
20.
21.
22.
23.
24.
25.
26.
27.
S2FUAL NUMBER
Aa EL COU. RL am
‘SHOCK AATARE - 8D NOT EFER/
RISOBE BE CROC - HE PAS CMREVER
SERURAORSSEEFARR-—“HICST GFFMEN /
CARTIBW: in coe of use ourside of indicated
service
power source arse, conmét’our
Shop for necessary conversion.
200W MAX. Tova, TOOW MAX
Ac 110-2400
80/60Hz 20W
Fig. 1 Controls
CAPACITANCE CONTROL
GROUND TERMINALS
TUNER JACKS
AUX JACKS
TAPE 1 SYSTEM REC/PLAY JACKS
REMOTE CONTROL JACK
TAPE 2 SYSTEM REC/PLAY JACKS
OUTPUT JACKS
AC OUTLETS (Some models are not equipped with this facility.]
AC CORD (Some models are equipped with an AC Inlet instead of
an AC cord. Connect with an appropriate power cord.)
TAPE 1 SYSTEM DIN JACK (Some models do not have this facility’-)
PHONO 2 INPUT JACKS
PHONO 1 INPUT JACKS

IV. PRINCIPAL PARTS LOCATION
MODE SWITCH
Swi
TREBLE CONTROL LED PC BOARD(A)
VRI PRA-6O00IC
SUBSONIC HIGH VOLUME DOWN SWITCH
Ssw3 sw4 SWITCH P,C BOARD
Sw2 PRA-6025
FILTER
BASS CONTROL SWITCHES LOUDNESS VOLUME UP
VR2 SWITCH SWITCH
sw2 swt
R FUSE POWER PRE AMP
P.C BOARD TRANSFORMER P.C BOARD
PRA-6022(U/T) T90I PRA-6001A
POWER
SWITCH
Sws0i
eecticeaialiny { Scie
TONE CONTROL
P.C BOARD
PRA-4002A
LED VOLUME INDICATOR
DSO
REMOTE LAMP
P.C BOARD
PRA-6026
FETYETIVTVIFITTTY,
VOLUME BLOCK
(VR2-ito5,SW4-1,2)
REC SELECTOR
SWITCH
sw3 swi
LED P.C BOARD(B)
PRA-4002B
PHONO SELECTOR
SWITCH
Swi
INPUT SELECTOR
SWITCH
Fig. 2 Front View
INPUT SELECTOR
P.C BOARD
PRA-6001B
Fig.3 Top View

V. VOLTAGE CONVERSION
SCREW
A
POWER SWITCH
oce
\
REAR
Fig.4 Voltage Conversion (U/T Model)
1. U/T MODEL (Refer to Fig. 4)
1. Switch off the power supply and remove the plug
from the mains supply.
2. Loosen holding screws and remove the top panel.
3. Remove the screw holding the Fuse P.C Board
located near the power transformer.
4. Remove existing Line Voltage Fuse and insert
required Line Voltage Fuse in the proper fuse
holder.
110V : 800mA 250V
220V : 400 mA 250V
240V : 400 mV 250V
2.
MODEL
OTHER
THAN
U/T
No voltage conversion.
Scere
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sneererverevaiienreeeset
8

Vi. ADJUSTMENT
DC CENTER OFF-SET
VOLTMETER VOLTAGE
aa
PRE AMP P,C BOARD PRA-600IA
Fig. 5 Pre Amp P.C Board/Instrument Connection
CENTER OFF-SET VOLTAGE
ADJUSTMENT (Refer to Fig. 5)
Connect the Digital Voltmeter or DC Voltmeter between
the test points on the Pre Amp P.C Board PRA-6001A
and the ground.
Adjust VR1 (L-ch), VR1b (R-ch) | kB, so that the volt-
meter reads 0 + 0.5V.

Vi.
CLASSIFICATION
OF
VARIOUS
P.C
BOARDS
1. P.C BOARD TITLES AND IDENTIFICATION NUMBERS
P.C Board Title PC Board Number
Pre Amp P.C Board PRA-001A
Input Selector P.C Board
LED P.C Board (A)
Fuse P.C Board (E) (CSA, AAL)
Switch P.C Board PRA6025
Tone Control P.C Board PRA-4002A
LED P.C Board (B)
Balance P.C Board PRA-4042
Chart-1
10