Onkyo A 7022 Service Manual

Page 1

SERIAL NO. 3006

ON KYO SERVICE MANUAL

SOLID STATE STEREO PRE MAIN AMPLIFIER

model A-7022

I N DEX
Item Page
Specifications
Component Locations 2

Adjustment of the Idling Current

Parts List 3 ~ 5
Packing Procedure 6
Circuit BoardAComponent Location 7 ~ 9
Circuit Diagram 10~11
Line Voltage and Fuse 12

0 N KYO®
AIIIIIII IIIIMPIIIIIIII

Page 4

2.

ADJUSTMENT OF THE IDLING CURRENT

Instrument required :

W hen
Q313,

no"; {u}
D3 1 23:
0305 n? -5 Jean
m \b 5; , 0303
_ 4' w H mac
:3 1 R317 {529
lDI/SOD DH :90
221
7213 :1
jvr 0307 R357
592" 25 0309 am,
3525
W 'l' int
C317 EF '-
Wit):-
w
22/25
5»

DC Ammetcr 50mA or 100mA.

DC Voltlneter 50mV or VTVM

replacing the POWER transistor (Q0013, Q004. Q005, Q0061 or the DRIVER transistor (Q3111, Q312,
(1314), check the idling current of the POWER transistor.

To adjust to normal value (40:5)mA, proceed as Iollows.

(Lch)

(Rah)

(I) Cut the connection between +3 and collector of Q003 on MAIN Amp assembly, and connect a DC
Ammeter.

(2) Adjust the current to (40:5)mA, with R319I2.2k§2) after switching on for 10 minutes.

(3) After adjusting, connect original wiring.

It a DC Voltmeter (50mV) or VTVM is available, connect the Voltmeter betweenEl and TP terminals.

Adjust the voltage (0 l:20i2.5)mv with R319l2.2k§l).

Using R320(2. 21(0), adjust in the same manner as indicated above,

as Note: Volume-Minimum. Open Load.

3. PARTS LIST

PARTS NO. DESCRIPTION SPECIFICATION Q'TY STOCK NO.
U001 Equalizer Amp ass'y NAEQZOG 1 12939506
U002 Tone Amp assy NATCISBb 1 1293958613
U003 Main Amp assy NAMA~187a 1 12939587A
U004 Power Supply assy NAFI-207 1 12939507
U005 Protector assy NAPCrZOB 1 12939508
883; Transistor ZSC945(P) 2 2210353
3833 u 2 SD 9/ Z 7 as D218(M) 2 2200042
QOOS
QM u j . ZSA649(M) 2 2200142

2.573907 2338!!!!

_3_