Sony CRF-5080 User manual

Circuit System:
Frequency Coverage:
intermediate Frequency:
Antenna System:
Sensitivity
at 50 mW output, S/N 6 dB:
SPECIFICATIONS
13-transistor 8-diode superheterodyne
G-transistors and 1 diode for auxiliary circuit
FM = 87,5 ~ 108 MHz (3.42 — 2.78 m)
LW 150 — 400 kHz (2,000 — 750 m)
MW 530 — 1,605 kHz (566 — 187 m)
4.6 — 3.5 MHz (187 — 86 m)
3.5 — 9.0 MHz (86 — 33 m)
9.0 — 14.0 MHz (33 = 21 m)
14 — 21 MHz {21 — 14m)
SWS 21 ~ 26 MH2 (14 — 14 m)
eM 10.7 MHz
LW/MW/SW- 485 kHz
FM telescopic antenna or external
antenna (impedance 75 $2}
LW/MW._ built-in ferrite bar antenna or
external antenna (high impedance)
sw telescopic antenna or external
antenna { high impedance }
FM 0.7 pV (-3.48)
LW 63 BV/m (36 dB/m)
MW 24 UV/m (27 d8/m)
1.2 pV! (18)
TMV (0 dB)
1 BVO dB)
1.2 UV (1 GB}
4.3MV (2 cB}
Selectivity
at + 10 kHz off-resonance:
Power Output
at 10 % distortion:
maximum:
Current Drain
at zero signal:
maximum:
Power Requirement:
‘Speaker:
Dimensions:
Weight:
35 dB at 1,400 kHz
1.8W
2.7W
FM 40 mA, MW 35 mA
320 mA
DC eight “’D”" size flashlight batteries
12 volts or car battery by using
SONY car battery cord DCC-2AW
AC house current 100 V, 120 V, 220 V
or 240 VAC; 50 Hz or 60 Hz
10 cm x 15 cm (4" x 6}, 8 2
340 mm (W) x 230 mm {H) x 160 mm (D)
13 36" x9 3G" x6 9G" J
6.6 kg {14 Ib 9 oz) overall with batteries
SON Ye
SERVICE MANUAL

CRF-50
TABLE OF CONTENTS '
Section Title Page Section Title Page
Specifications... .......5 1
1. OUTLINE 3-2, AMIfAlignment......... 9
33, Bfo Osc Coil Adjustment... .. 9
Fel. Block Diagram... 22.00. 3 ose Coll Adiurment a2)
: 3-4. Frequency Coverage and Tracking
12. External View... 2.000005 3 :
Adjustment,.......... 10
2. DISASSEMBLY AND REASSEMBLY 4. DIAGRAMS
2-1. Front Panel Removal. .
22. ChassisRemoval..... 0... - 4 aa Eprucavaivan bees i
2-3. FMFrontEnd Removal... ... 5 a ala Re
2-4, FMFront End Reassembly. 3
25. Dial Scale Reassembly . 5. EXPLODED VIEW AND PACKING
2-6, Circuit Board Removal 6 5-1. Exploded View (1). 2 2... 7
2-7, Dial Cord Stringing. 6 5-2, Exploded View (2)... 0.0... - 19
$3. Packing... 2... ee eee 2
3. CIRCUIT ADJUSTMENTS
al. FMUf Alignment ......... 8 6. ELECTRICAL PARTS LIST....... . 22
Hardware Nomenclature
P — Pan Head Screw ......... -@® (E5_ | E — Retaining Ring (E Washer) or)
— Flat Countersunk Head Screw 6) f= W ~ Washer
B — Binding Head Screw ......... @) Ky = Biainiple = SW — Spring Washer
RK — Oval Countersunk Head Screw .(9) (3 fipseaisist LY Pane RE
T = Truss Head Screw 0.2... @) | eraxt0 Bre Re
R -
Round Head Screw ........- @) qe Length in mm (L)
ae ”
F Flat Pillister Head S: = ta I i fi
- hat Feilhi: lead Screw i it
aeieitec Diameter in mm (D) l_--l 1.
SC = Set Screw ....... 0.0. cece en Type of Head ~ oO
When ordering replacement parts, you should use PART NUMBER
listed on the Parts List or shown in the EXPLODED VIEW.
The reference number should not be used for ordering purposes.

| eRE-5080
SECTION 1
OUTLINE
1-1. BLOCK DIAGRAM
AFC.
207
FA IF AMP.
LOAAWIS MIX
9202
FM METER
RE GAIN
CONTROL
0210
METER AMP
ue
TUNING METER
+or
+82 POWER AMP x
aQ
1-2, EXTERNAL VIEW
= 1-501-129
X:38424-88-1 : R antenna, telescopic
caver ass’y, dial } ae =
3842-437
button, LIGHT
1-§14-729-41
1-514-866 switch, AFC
switch, POWER
BFO ae ni X-38424.81
3-842-464 RF GAIN ad ees a knob ass’y, BAND SELECTOR
knob, controt ‘| TONE
VOLUME
3 3842-466
3-842-440 B ea knob, tuning
emblem, “SONY”
X-38424-82
knob ass’y, FINE TUNING

CRF-5080
SECTION 2
DISASSEMBLY AND REASSEMBLY
2-1, FRONT PANEL REMOVAL
To remove tront cover, pull either front cover ff
stiding shaft toward inside and slide the front
cover out.
Unsolder the three speaker leads (YEL and Two
BRN) at terminal strip.
screw, BB2x4
o
& screw, ®B 2x8

CRF-508¢
SECTION 1
OUTLINE
1-1. BLOCK DIAGRAM
TEL Eas
ANT
u/s
20%
PME IF AMP.
LWASWISW MIX
+at
0208, 0209
RECTIFIER
CAR BATT, + 0212, 0213 p 2
BC
RV
62
POWER
AMI
x,
4|t}-----4}
4 BATT
BC 12Vv
1-2. EXTERNAL VIEW
E j 1501-129
X-38424-88-1 = g antenna, telescopic
caver ass’y, dial :
3842-437
button, LIGHT
1-§14-729-44
1514-866 switch, AFC
switch, POWER =~
‘BFO i = x } X-38424-81
3842-464 RF GAIN E = t knob ass’y, BAND SELECTOR
knab, control | TONE
VOLUME
Presa fob, nag
emblem, “SONY” af, = PaAn e
X-38424-82
knob ass’y, FINE TUNING

SECTION 2
CRF-5080
DISASSEMBLY AND REASSEMBLY
2-1. FRONT PANEL REMOVAL
screw, @ T3x ae
To remove front cover, pull either front cover |
sliding shaft toward inside and slide the front
cover out.
Unsojder the three speaker leads (YEL and Two
BRN) at terminal strip.
RD screw, @P3x6
~ Mn aes
BAND cr
pull off the
knob
sorew, DBI x4
@
re screw, OB3xB
screw, @ 3x6
ee Fig. 2-2.

CRF-508
2.3. FM FRONT END REMOVAL 25, DIAL SCALE REASSEMBLY
q OPex8 1. Rotate the BAND SELECTOR knob fully
clockwise.
2, Set the dial drum adjusting the two machine
screws (A) so that it shows FM band and that
the tip of the pointer is on the line of FM band
as shown in Fig. 2-6.
2.4. FM FRONT END REASSEMBLY
be Rotate the dial drum fully clockwise and the
double gear ass’y fully counterclockwise.
2, Set the fm front end with three screws.
See Fig. 2-3. above.
dial drum ,
pi acai BAND SELECTOR knob
Fig. 2-5.
x
27)
pointer
Fig. 2-6,
double gear ass‘y .
at fully conter- Fig. 2-4.
clockwise position

2-6.
ow
CRF-5080
CIRCUIT BOARD REMOVAL
Remove the chassis.
Unsolder the 13 wires and capacitor lead
shown in Fig. 2-7.
Remove the connector A from the band selector
switch shaft by wedging with a slot screwdriver
in the direction shown by the arrow in Fig. 2-8.
Remove the two screws.
Remove the circuit board in the direction shown
by the arrow in Fig. 2-7.
The removed circuit board is shown in Fig. 2-9.
(@ screw, machine
Fig. 2-7,
3-842-488
connector A
2-7. DIAL CORD STRINGING
Dial Drum Driving Cord
: 93 om (36-5/8"}
CMI ss 1
dial drum : at fully
clockwise
Unsoider
==
3% turns
fcounter-
clockwise)
tuning shaft Fig. 2-10.

CRF-5080
Pointer Driving Cord
ig 83 em (32-3/4") — 7]
ONIN tf ==
fasten with eyelet
dial drum:
at fully clockwise position
oe Fig. 2-11.
set the pointer at
the leftmost dot of the dial scale
Fig. 2-12,

icrr-5080 |
SECTION 3
CIRCUIT ADJUSTMENTS
Modulation:
Test Equipment/Tools Required:
Rf signal generator {for fm and a-m)
Loop antenna
VTVM
8 Q resistor
0.01 WF ceramic capacitor
Screwdriver for alignment
Preparation
VTVM Connection:
To EARPHONE jack with 8 Q load
resistor in parallel
3-1. FM IF: ALIGNMENT
Setup is shown in Fig. 3-1.
Set the POWER switch to ON,
Set the BAND SELECTOR to FM.
VOLUME Controi Setting:
TONE Control Setting:
FM
AM 400 Hz, 30-%
lated signal
signal
AFC Switch: OFF
BFO Controi Setting: OFF
RF Gain Control Setting:
Connect the rf signal generator to the FM
ext ant terminal after detaching antenna lug as
shown in Fig, 3-2.
rf signal
generator
(SEX mvt st
©
:
pt
FM
ext antenna
terminals
jack
Fig. 3-1, FM i-f alignment, frequency coverage
and tracking adjustment setup
EARPHONE
8 Qresistor
NORMAL
detach
antenna lug.
from rf signal
generator
Fig. 3-2. Rf signal generator coupling
a Signal RE Signat sah
enerator Modulation just Remarks
Frequency
IFT F4
10.7 MHz 400 iz, 30% a-m modulation | gee Fig. 3-6,| Adjust for minimum meter reading(*1),
10.7 MHz 400 Hz, +22.5 kHz fm IFT F101 Set the tuning knob at the best signal
modulation IFT -F-2(*2)] position.
IFT F3 Adjust for maximum meter reading,
See Fig. 3-4
and Fig.
346.
Note:*1. Minimum output will be observed at both extremes of the discriminator. The real null point will be
obtained in the middlc of the core thread length and maximum output will be obtained at both sides of
the true null point. Slowly and carefuily turn the core to obtain minimum output.
*2. IFT F-2 is unable to adjust from rear part of the set. Remove the front panel and adjust IFT F-2 from
front part, (See Fig. 3-4).
400 Hz, +22.5 kHz frequency-medu-
amplitude-modulated
Mechanical mid position
Mechanical mid position