Sansui A 80 Service Manual

Page 2

1. BLOCK DIAGRAM

f
E0 AMP lNPUT POWER/DRWER
SELECTOR SPEAKERS
nnonoc M M r .1.
a: l
TuN ERC Q
1
A x -
U C 2 ca 5
m p C
IAPE71 RLMC 1? r; 3
Z m
TAPE? PLAYC R g
J DC SERvo AMP 8 g
/ ~ -al
3
_ I 4:33
TAPES} REC C 3 POWER LEVE éi
REC our SELECTOR REC r SELECTOR c - *
TAREEZ REc c 0 i DRlVER ga
p
READJMV

TONE AMP POWER/DRIVER

[0 AMP M spEAKERs
SELECTOR MUHNL
PHONOC '1 » '2' w
l L {/ l9
ruNERC . T
l | m
J r % E
m

TAPErl PLAVC * I DE SERVO AMP
HltrH FlLTFR

an H:
orNosans

swmoA

7
G

TAPE 2 PLAY 0 7

ssaumm

7 TAPEVZ FLAV CH7
FRONT
LuxRErz REC C l

TAPE~I REC C 777 777?
REC our sELEcmR REc om SELECTOR
TAPE 2 REc Mgr;

PquR LEVEL
DRlVER

HOJVQIOM
unaw HEMOd

$
Fir n 4
lll

2. ADJUSTMENTS

Notes: 1. Room Temperature ........ 18C ~ 28°C (65°F ~ 83°F) 3L Before adjusting or confirming the bias current,
2, For this adjustment, run the unit for more than 5 minutes after avoid such a measurement thatthe power transi-
the power is switched ON with its level volumes minimumt stars are heated.
2-1. A-60 Bias Current Adjustment (See Top View on page 6)
STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARK

L Bias Current Voltage across R71 VROl on F-3159 DC 1.5 mV Before turning ON power switch, turn
(L-CH) Adj. VR01,VR02 fully counterclockwise.

2. Bias Current Voltage across R72 VR02 on F3159 DC 15 mV In this adjustment, the bias current is con-
(R-CH) Adj. verted into the voltage

2-2. A-80 Bias Current Adjustment (See Top View on page 7)

STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARK
l. Bias Current Voltage across R87 VROI on F3144 DC 1.5 mV Before turning 0N power switch, turn
(L-CH) Adj. VROl , VR02 fully counterclockwise.
2. Bias Current Voltage across R88 VR02 on F-3I44 DC 15 mV In this adjustment, the bias current is con-

(R-CH) Adj, verled into the voltage.