Sony SRS-T77 Service Manual ▷ View online
SERVICE MANUAL
Amplifier section
• Power output: 2 W + 2 W
• Input: Speaker cord with stereo miniplug (50 cm)
• Input impedance: 4.7 kilohms (at 1 kHz)
• Input: Speaker cord with stereo miniplug (50 cm)
• Input impedance: 4.7 kilohms (at 1 kHz)
Speaker section
• System: Full-range, bass reflex type
• Speaker units: Magnetically shielded ø 39 mm
• Impedance: 8 ohms
• Rated input power: 2 W
• Maximum input power: 4 W
• Speaker units: Magnetically shielded ø 39 mm
• Impedance: 8 ohms
• Rated input power: 2 W
• Maximum input power: 4 W
General
• Power requirement: Four R6 (size AA) batteries/DC 9 V
• Battery life (at TOTAL 10 mW output):
• Battery life (at TOTAL 10 mW output):
Approx. 24 hours Sony alkaline batteries LR6 (SG)
Approx. 8 hours Sony manganese batteries R6P (SR)
Approx. 8 hours Sony manganese batteries R6P (SR)
• Dimensions: Approx. 221
×
127
×
117 mm (8
3
/
4
×
5
×
4
5
/
8
in.) (w/h/d) (during use)
Approx. 143
×
127
×
29 mm (5
3
/
4
×
5
×
1
3
/
16
in.)
(w/h/d) (folded)
• Mass: Approx. 260 g (9 oz.) not incl. batteries Approx.
350 g (12 oz.) incl. batteries
• Supplied accessories: AC power adaptor
AC- E90A (1), Carrying case (1), Plug adaptor (1)*
*For world model only.
Design and specifications are subject to change without
notice.
notice.
Features
• The Sony SRS-T77 is a compact (CD case-sized) speaker
system with a built-in power amplifier. This system can be
connected to a Discman, WALKMAN*, headphone
stereo, etc.
connected to a Discman, WALKMAN*, headphone
stereo, etc.
• The SRS-T77 has a dual power supply system. When you
operate the SRS-T77 outdoors, use battery power, and
when you operate it indoors, use an AC power adaptor
(supplied).
when you operate it indoors, use an AC power adaptor
(supplied).
Rich and powerful bass
• Power output of 2 W + 2 W
• The embedded MEGA BASS delivers rich bass regardless
• The embedded MEGA BASS delivers rich bass regardless
of the sound volume.
*WALKMAN is a registered trademark of Sony
Corporation.
Note on the AC power adaptor
Use only the AC-E90A (supplied) AC power adaptor.
Do not use any other AC power adaptor.
Do not use any other AC power adaptor.
Polarity of the plug
ACTIVE SPEAKER SYSTEM
US Model
Canadian Model
Tourist Model
SRS-T77
Ver 1.0 2001.02
9-927-993-11
Sony Corporation
2001B0500-1
Audio Entertainment Group
C
2001.2
General Engineering Dept.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SPECIFICATIONS
2
SRS-T77
SECTION 1
GENERAL
This section is extracted from
instruction manual.
instruction manual.
• LOCATION OF CONTROL
Right speaker
Left speaker
POWER switch
Speaker cord
Stand
Bass reflex duct
POWER indicator
3
SRS-T77
2-2.
CASE, FRONT
• This set can be disassembled in the order shown below.
2-1.
DISASSEMBLY FLOW
SECTION 2
DISASSEMBLY
Note:
Follow the disassembly procedure in the numerical order given.
Set
Speaker unit (SP1) (L ch)/(SP2) (R ch)
AMP board, Jack board
Draw Around Lead Wires
Case, Front
3
six screws
(P2.6
(P2.6
×
10)
4
screw
(P2
(P2
×
5)
1
Open stand
in the direction of arrow
in the direction of arrow
A
.
2
lid, battery case
5
case, front
A
4
SRS-T77
2-3.
SPEAKER UNIT (SP1) (L ch)/(SP2) (R ch)
1
Remove two solders of lead
from speaker unit (SP1) (L ch).
from speaker unit (SP1) (L ch).
6
Remove two solders of lead
from speaker unit (SP2) (R ch).
from speaker unit (SP2) (R ch).
2
two screws
(P2.6
(P2.6
×
6)
7
two screws
(P2.6
(P2.6
×
6)
4
Remove “holder, rotary shaft”
in the direction of arrow
in the direction of arrow
A
.
A
9
Remove “holder, rotary shaft”
in the direction of arrow
in the direction of arrow
B
.
8
B
3
5
speaker unit (L ch) assy
0
speaker unit (R ch) assy
Note:
It is not necessary to remove speaker unit (L ch) assy
to remove speaker unit (R ch) assy.
to remove speaker unit (R ch) assy.
qf
four screws
(P2.6
(P2.6
×
6)
w;
four screws
(P2.6
(P2.6
×
6)
qj
four screws
(P2.6
(P2.6
×
6)
qa
four screws
(P2.6
(P2.6
×
6)
qs
cabinet (L), rear
qk
cabinet (R), rear
qh
cabinet (L) assy, front
ws
cabinet (R) assy, front
qg
speaker unit (SP1) (L ch)
wa
speaker unit (SP2) (R ch)
qd
absorbent, acoustic
ql
absorbent, acoustic
Note:
It is not necessary to remove speaker unit (SP1) (L ch)
to remove speaker unit (SP2) (R ch).
to remove speaker unit (SP2) (R ch).