Sansui A 60 Service Manual

Page 2

1. BLOCK DIAGRAM

f
E0 AMP lNPUT POWER/DRWER
SELECTOR SPEAKERS
DHoNOC M M r .1.
c ; b
TUN ER 0
3. TONE
AUX c ,:
a m 5
m > c
TAPErl Dave I! I; 3 <
2 m
o
TAF'Er2 PLAYC m 3
J DC SERVO AMP
Tfl i,fi
o fia
R A? H
T
/ Q E 1:
-E- . 2
TAP REC 3 POWER LEVEL 9 Q
REC our SE CTOR REC T R o "
TAPE? REC 6-iE- 0U SELECTO i DfilVER $5
2 p
HEAD AMP
"' Eo AMP INPUT TONE AMF' POWER/DRIVER , _
SELECTDR MuTTNG UHF
FHONOC .1. 5:. W ,
n m
; :
TUNERC - :1:
2
AUXC r A,
m g <
TAPE?! PLAYC 7' g E .1. Di. SERVO AMP
z
MPE 2 put c L: 5 Mom th Tm G
s I i
7 new my (9*. r-A
FROM _
liiAPEVZ REC C I ,
TAPE: REC Ckv-L ® 1.
REC OUT SELECTOR REC OUT SELECTOR
TAPE'Z REC C ,77 E D
so
POWER LEVEL 5;
DRlVER 3 a:
or
m
L P1

2. ADJUSTMENTS

Notes: 1. Room Temperature ........ 18°C ~ 28°C (65°F ~ 83°F)
2. For this adjustment, run the unit for more than 5 minutes after
the power is switched 0N with its level volumes minimum.

2-1. A-60 Bias Current Adjustment (See Top View on page 6)

3. Before adjusting or confirming the bias current,
avoid such a measurement that,the power transi»
stors are heated.

STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARK
1. Bias Current Voltage across R71 VR01 on F-3159 DC 15 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. VRO] , VR02 fully counterclockwise.
2. Bias Current Voltage across R88 VR02 on F-3144 DC 15 mV In this adjustment, the bias current is con-
(RvCH) Adj, verted into the voltage.