Sony TR-8460 User manual

TR-8460
SPECIFICATIONS
Circuit System: 11-transistor 1-diode superheterodyne
Frequency Coverage: 108 — 136 MHz (2.78 — 2.20 m)
Intermediate Frequency: 10.7 MHz
Antenna System: Built-in telescopic antenna
Sensitivity
at 50 mW output: 1 MV (0 dB) at S/N 6 cB
Selectivity
at +200 kHz off-resonance: 50dB at 122 MHz
at —200 kHz off-resonance: 55 dB at 122 MHz
Power Output
at 10% distortion: 670 mW
maximum: 900 mw
Current Drain
at zero signal: 26 mA
at 10% distortion: 240 mA
Power Requirement: Four “’D" size flashlight batteries 6V or
house current by using ac adaptor
AC-601W
Speaker: 9.2 cm (3 3/4") dia. 8 Q
Dimensions: 268 mm (W) x 140 mm (H) x 53 mm (D)
(10 Y2"x 5 7/2" x2 16")
Weight: 1.3 kg (2 Ib 14 02) with batteries
SON Ye
SERVICE MANUAL

Section Title Page
Specifications: . 2. ...-2 4.4 So. ee es ]
42 OUTLINE? fs %t ce ek SA a ee EG 3
1-1. External View... ...-.-..2-.4- 3
1-2. Internal View .....-...-.2-8. 3
1-3. Block Diagram. ..... 2-7-2... 3
2. DISASSEMBLY .............-.-. 4
2-1. Rear Cabinet Removal. ......... 4
2-2. Circuit Board Removal. ......... 4
2-3. Cursor Removal ........-...-.--. 4
2-4. Dial Cord Stringing ........... 4
3. CIRCUIT ADJUSTMENTS ......... 6
3-1. l-f Alignment .........-..2.--4-. 6
3-2. Frequency Coverage and Tracking
Adjustment... ........2-- 6
4. MOUNTING AND SCHEMATIC
DIAGRAM ............-...5. 7
4-1. Mounting Diagram - Component Side ~. 7
4-2. Mounting Diagram — Conductor Side — - 8
4-3. Schematic Diagram ....-... 17. 9
5. EXPLODED VIEW AND PACKING . .. . 10
5-1. Exploded View (1) 2... .....-.. 10
5-2. Exploded View (2). 2... 02-0 - iat
SS. PACKINGS (s,:8 vive. ar Be hae Ge a 12
6. ELECTRICAL PARTS LiST ........ 13
TABLE OF CONTENTS
Hardware Nomenclature
Pan Head Screw ...
- Flat Countersunk Head Screw
Binding Head Screw
Oval Countersunk Head Screw
Truss Head Screw . .
Round Head Screw
Type of Slot
@ P3x 10
(2
=
( — Example ——-
(=
=
(=
settee
(=)
s_]
Type
of
Head
E — Retaining Ring (E Washer)
Ee Length in mm (L)
Flat Fillister Head Screw ..... SB am) Diameter in mm (D) ie
Set Screw ........
~ Nut
f
L
ai
a
Tae
al
oO
W — Washer
Spring Washer
Lock Washer
L
Tl
—
When ordering replacement parts, you should use PART NUMBER
listed on the Parts Lists or shown in the EXPLODED VIEW.
The reference number should not be used for ordering purposes.
Ss

SECTION 1
OUTLINE
a 2
4.4 EXTERNAI JiEW
coe. EAD RNAL VERY
X-38405-85-7
knob ass'Y, VOIUING
and squelch control
re eee 717-501-072
X-38405-84-1
Sena eemcem ernie carrying handle
assy
—
SQUELCt
Q&
Q
i
| , |
| ; |
J
of
if
F
Veo?
|
p
|
Ss Al. ES O POWER AM
d
REC
OUT
(Yas
|
Q10
I
}
0
é
AF AMP
eds L
>AV || Exr power
en
| (la ag fo
| ATT aH pp, y¥ be] |
a
ee
a
POWER
AMP
|
4
| ey fe
thr eee |
antenna, telescopic

SECTION 2
DISASSEMBLY
2-1. REAR CABINET REMOVAL 2-3. CURSOR REMOVAL
- : 4 Nt mai +
2.
2.
Loosen
the
screw
marked
D)
in
Fig.
2-2
and
e
remove
the
dial
cord
from
the
dial
cord
retainer.
; 3 eB ve two
-~ screw, tapping 3. Remove the two
OD
@P3x
12
and
remove
the
dial
scale
a
oo
4.
Remove
the
cursor.
dial scale haiding case
DIAL CORD STRINGI
smove the circuit
y
Rp
| ee q
2. Prepare the
Sc
on
Fig.
2-4
| : —
eapacitor @) screw, tapping XC) screw, tap
leg “ @P26x8 “ @OP32x6
Fig. 2-2
pe
|

3-828-820
19
”
spring,
dial
cord
1
eee
777
mm
(30
7/32
j
ee
aceeSES|
ri
acca aaa
7-633- 120-52 7-623-609
dial cord eyelet, 1.5.x 2
Fig. 2-5

SECTION 3
CIRCUIT ADJUSTMENTS
Preparation
Test Equipments/Tools Required:
Rf signal generator (for a-m)
VTVM
rf signal VTVM
8 Q resistor generator festiset earphone
Screwdriver for alignment TX jack ke
Preparation: VTVM Connection: ‘a
To earphone jack with 8 Q load
resistor in parallel.
Oo pel eeeeeeeen oe
sae hig Se 8 Qlresistor
Modulation: 1-kHz 30-% amplitude-modulated signal
VOL Control Setting: MAX Fig. 3-1. | Fm frequency coverage and tracking
SQUELCH Control Setting: OFF adjustment setup
3-1. IF ALIGNMENT
Rf Signal
Generator
Frequency
10.7 MHz
(1 kHz
30% a-m)
Rf Signal
Generator
Coupling
VTVM
Connection
See Fig. 3-1
and Fig. 3-2
Earphone jack with
8 Q load resistor in
parallel
Remarks
VOL control
SQUELCH control :
MAX
OFF
Adjust for maximum meter reading.
3-2. FREQUENCY COVERAGE AND TRACKING ADJUSTMENT
Rf Signal Rf Signal
Receiver
Adjustment Generator Generator Dial Adjust Remarks
Coupling Frequency Setting
Frequency See Fig. 3-2 107.0 MHz Fully osc coil Adjust for maximum meter
Coverage left L3 reading.
VOL control >MAX
137.5 MH sc
z oe SQUELCH control: OFF
trimmer
CT2
Tracking 108 MHz Tune to rf coil
108 MHz LE?
signal
136 MHz Tune to rf trimmer
136 MHz CT 1
signal
from rf S)
Signal generator
rf trimmer
osc coil
L3
osc trimmer
CT2
cT1
rf coil
L2
MFT 1 IFT 4
IFT
2
IFT
3

SECTION 4
MOUNTING AND SCHEMATIC DIAGRAM
MOUNTING DIAGRAM
— Component Side —
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4-1.
ld
a
E8EEST
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FEOVIST
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a
WIL
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q
em
2
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-8460
4-2. MOUNTING DIAGRAM
— Conductor Side —
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-8460
SECTION 5
EXPLODED VIEW AND PACKING
5-1. EXPLODED VIEW (1)
Parts marked > are included in carrying handle ass’y (X-38405-84-1)
¥ 3-835-432
arm, carrying handle Ww % 3-835-431
carrying handle Parts marked © are included in battery lid ass’y (X-38405-87-1)
@ ow Parts marked {J are included in rear cabinet ass’y (X-38405-89-1)
Se
S
* 3-840-504 : Parts marked a are included in main cabinet ass’y (X-38405-88-
Fees von vids neath -) re i in in cabinet ass’y ( 5-8 8-1)
.
‘
1
4
3-840-515
*
3-836-433
sash
*
7-685-234-21
spacer,
carrying
handle
H
*
7-685-134-21
screw,tapping
®
K
2.6
x
8
screw, tapping ® P2.6x 8
* 7-623-107-15
washer, 2.6 b
4 3-840-506
fiber washer
4 7-623-639
eyelet 4x5
443-835-460
cushion,
100
x
10x
9
a3-835-401
cabinet, main
1-502-183 |
speaker ee
3-804-510 |
retainer, speaker |
7-623-508-01
lug 3b
3-835-443
7-621-722-46
_-4
“oe
-
@
oe
as
battery
negative
4 3-835-446
ornamental plate, front
screw, tapping ® PZ x6
1-507-050-51
jack, earphone a ee
1-507-261-11
fack, ext power
7-633-120-52
dial cord, 0.25 p
7-685-134-27
screw, tapping
®P2E6x8
113-822-524
label,
caution
7-684-035-01
nut 5
7-623-212-12
spring washer 5 $
2 ~
:
Bs
a
Re
3-811-538
(213-835-462
3.
..
x
:
cushion
,
A
Battery
tape
terminal
plate,
antenna
<<
AIR
(139-835-411
é
ew
>
aa
rear
cabinet
i (
3-835-412
SSS
Ie
BO
ene
Le
4
{J
3-840-505
XP
cushion
220
x
6
(13-835-461
O3-840-531
cushion
80
x
10
spacer,
battery
cover
)3-840-510
plate, specification
©3-809-058 (|3-835-466
cushion,
battery
cushion
scents
OP
gx42
(J3-835-466
3-835-467
cushion
washer,
telescopic
antenna
(17-621-255-52 1-601-072 :
screw O®P2x8 antenna, telescopic
(353-823-309
antenna catch
—10—