Onkyo A-7 Service Manual

MAIN AMP. (NAMA-376a)
MAIN AMP, PC BOARD-PARTS LIST
CIRCUIT NO.
Q601~Q604
Q605~Q608
Q609. Q610
Q611, 0612
Q613, Q614
Q615, Q616
Q617, Q618
D601~D604
STOCK NO.
Transistors
2210754
2210755 7
2211084
2211085 °*
2211032
2211033 °*
9211022
2211023
2210743
2210744 °F
2200364
2200354
Diodes
223105
DESCRIPTION
erent or Differential Amp.
See
SAE
or
Differential
Amp,
A912
ree
Driver
Amp.
25C1885(Q) :
2§C1885(R) Driver Amp.
28094 P
Scat oO) Bias Stabilization
28D358(D) Complement
2SB528(D)
Complement
181555
BOTTOM VIEW
CIRCUIT NO.
L601, L602
C605, C606
C619, C620
C625, C626
C631, C632
C633~C636
R607, R608
R645, R646
R651, R652
R657, R658
R659~R662
STOCK NO.
Coils
2310601
Capacitors
390480477
352744711
374121045
374121044
352770331
DESCRIPIION
$-1.3B
4.7pF 50 LD
470uF 1€V EL
O.1uFt10% 50V DE
O.1uF+ 5% 50V DE
3.3uF 63V EL
Variable Resistors
§221008
§221007
Resistors
451630274
48114795
R-HK4.7KB38S CENTER VOLTAGE
R-HK2.2F.B3S8 IDLING CURRENT
2.7 ohm 1W Metal
0.47 ohm SW Cement
NOTES: When replacing differential amplifier or push-pull amplifier transistors, be sure that transistors of one channel have
the same hrg ratings.
MAIN AMP. ALIGNMENT
NOTES: 1, Set up A-7 as follows:
SELECTOR... AUX TONE SHIFT.... DEFEAT
TONE & BALANCE .., Center
FILTER/LOUDNESS/DUBBING .., OFF
MODE .,,.STEREO T.MONITOR ... SOURCE
SPEAKERS... OFF VOLUME ... Maximum (0dB)
2. Adjust after switching on for 3 minutes,
1. IDLING CURRENT ADJUSTMENT
Connect the DC Voltmeter between Ipp and V7 terminals.
Adjust the Voltage to 17£2mV with R645. (Left channel)
Adjust the Voltage to 17£2mV with R646, (Right channel)
2. CENTER VOLTAGE ADJUSTMENT
Connect the DC Voltmeter between Vey and E terminals.
Adjust the Voltage to 0+5mV with R607. (Left channel)
Adjust the Voltage to 0t5mV with R608. (Right channel)
CIRCUIT NO,
R663, R664
R667, R668
R671, R672
STOCK NO.
Resistors
451630684
451731004
441521014
Themistors
TH601,TH602 4000003
DESCRIPTION
6.8 ohm ]W
10 ohm 2W
100 ohm 1/2W
D-22A
SWITCH PC BOARD-PARTS LIST
Rotary Switches
NRS-1 44-30ZL
25030069
25030068
25030068
NRS-143-30A
NRS-143-30A
Metal
Metal
Métal Oxide Film
SELECTOR i 5, 3O
DUBBING
MONITOR
TONE CONTROL PC BOARD — PARTS LIST
Capacitors
C403,C404 374122044 O.2uF+5% SOV DE
C407,C408 374121144 O,lipFt5S%50V DE
C409,C410 390882207 22uFt50V SLD
C413,C414 372328214 820pF*5%50V ST
Rotary Variable Resistors
R40] 5104042 GH30E-196K x 2 BASS
R413 5104043 GH30E-171K x 2 TREBLE
Rotary Switches
$401,S8402 25030072 NRS-143-30ZV FREQUENCY SHIFT
Capacitor a
DE: Non-Inductive Polyester Film Capacitor.
LD, SLD: Low Leakage Current Type Electrolytic Capacitor.
ST: Polystyren Film Capacitor.
EL: Electrolytic Capacitor.

Onkyo A-7 Specifications

General

Brand	Onkyo
Model	A-7
Category	Amplifier
Language	English