Sanyo 18H-815 User Manual

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18-transistor, 6-band
Portable Radio
move. 18H-815
SERVICE MANUAL
‘SANYO ELECTRIC CO., LTD.
INTERNATIONAL DIVISION: SANYO ELECTRIC TRADING CO., LTD.
OSAKA, JAPAN
(14) 2SB186A Audio Amplifier
ALIGNMENT PROCEDURES
AM ALIGNMENT
Sequence
of
Wave
Dial
signal
Generator
Connection
high
side
Alignment
Range
|
Pointer
etnies
of
Signal
Generator
Thru. Loop Antenna
Cd
LF.T. T15 1600KC} 455KC
LF.T. T14 MW 1600KC} 455KC
i.F.T. T13 MW 1600KC; 455KC
Oscillator
LW
LW
160KC;
160KC
”
Antenna
LW
LW
160KC}
160KC
Oscillator MW MW 600KC
Antenna MW MW 600KC
Oscillator SW1 SW 1 2.5MC
Antenna SWI SW 1 2.5MC
Oscillator SW2 SW 2 9.0MC
Antenna SW2 SW 2 9.0MC
Oscillator 49m 49m 6.0MC
Antenna 49m 49m 6.0MC
FM IF ALIGNMENT
SPECIFICATIONS
Frequency Range---+-++-++ FM 87 - 108 MC (16) 2SB405R Power Amplifier
SW1 23 - 73 MC (17) 2SD72R Power Amplifier
SW2 8.0 - 22.0 MC 7 (18) 2SC537Z Voltage Stabilizer
49m 595 - 7.3 MC Diodes «s+-++++eee- (1) 18553 A.F.C.
MW 520 - 1605 KC - €2) 18188 FM Limiter
a LW 150 - 350 KC (3) 18188 FM A.G.C.
‘ oes Frequency::+-+-sree-see- FM 10.7 MC C4) 18188 Discriminator
: AM 455 KC (5) 18188 Discriminator
Transistors - cote (1) 2SC668E FM RF Amplifier (6) SIA3 AM Biasing
(2) 2SC545C FM Local Oscillator (7) 18188 AM Detector
(3)
28C668C
FM
Converter
(8)
SIA3
FM
Oscillator
Stabilizer
(4) 2S8C545E FM ist IF Amplifier (9) SZ-8 Voltage Detector
(5) 28C537 FM 2nd IF Amplifier Output Power -------- Maximum 3,000 mW
(6) 28CS537 FM 3rd IF Amplifier | Undistorted 2,000 mW
(7)
2SA222
AM
Converter
Power
Supply
---------
12
volts,
8xUM-1
(size
“D’’
flashlight
battery)
(8) 28C537 AM Local Oscillator or AC adaptor (D12-815)
(9) 28C537E AM 1st IF Amplifier ' Current Drain --------- No signal 30 mA
(10) 2SC537 AM 2nd IF Amplifier © Maximum 420 mA
(11)
2SD187
Squelch
Control
Speaker
oe
ese
eceeee
scenes
5”x7’
oval
type
permanent
dynamic
(12) 2SB303 Audio Amplifier . 4 ohm voice coil impedance
(13)
2SB186A
Audio
Amplifier
Cabinet
Dimensions
------
1514”(390mm)
wide
x
914”
(240mm)
high
( x 484” (240mm) deep
(15) 2SB187 Driver Net Weight -----+-++++- 10 ibs. (4.5 kg)
Coil ‘
Adjust- Pate
ment or
12 |°320KC
320KC
Ft ee
Signal Generator|Trimmer
Fre- |Modula-
Indication
Adjust-
ment |
quency tion
Max. Output
TO ———————
Adjustment Curve
Sequence of Wave | Alignment Testing Equipment Connection
Alignment
Range
|
Frequency
:
1
T-6
(LF.TO
FM
10.7
MC
Connect
sweep
generator
to
test
point
TP-1
and
oscilloscope
to
test
point
Tp-2.
2
T-5
(1.F.T.)
FM
10.7
MC
Same
as
above
connection.
3
T-4
(LF.T.)
FM
10.7
MC
Same
as
above
connection.
4.
T-7
(C.F.T.)
|
FM
-
10.7
MC
Connect
sweep
generator
to
test
| point to TP-1 an oscilloscope to
| test point TP-
FM RF ALIGNMENT
Sequence
of
Wave
Dial
signe
oe
Connect
high
side
of
i
i
=
‘
Generator
to
Alignment
Range
|
Pointer
egeuey
ae
Oscillator
FM
87.0
MC!
87.0
MC|
22.5
KC]
Signal
generator
to
TP-1
Antenna
FM
87.0
MC/87.0
MC|
22.5
KC|
Signal
generator
to
TP-1
Detune T7 and tune T6 for max. |
gain and symmetry of response
curve.
tune T-5 for max. gain and sym-
metry of response curve.
tune T-4 for max gain and sym-
metry of response curve.
tune T-7 for symmetry and max.
gain of response curve.
Coil :
Adjust- Dial
Pointer
ment
T-2 104.0 MC
Signal Generator
Freque- |Modula-
Trimmer
Adjust-
ment
Indicator
ncy tion
T-3 104.0 MC | 104.0 MC | 22.5 KC; Ct-2 Max output
104.0 MC | 22.5 KC
Ct-1 Max output
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Sanyo 18H-815 Specifications

General

Brand	Sanyo
Model	18H-815
Category	Portable Radio
Language	English

Summary

Radio Specifications

Frequency Range

Details the radio's reception bands including FM, SW1, SW2, 49m, MW, and LW frequencies.

Intermediate Frequency

Specifies the intermediate frequency values for both FM and AM reception.

Transistor Identification

Lists all transistors used in the radio with their corresponding types and functions.

Diode Identification

Lists all diodes used in the radio with their respective types and roles.

Power and Supply Details

Outlines the output power, power supply requirements, and current drain.

Alignment Procedures

AM Alignment

Step-by-step guide for aligning the AM reception circuits using signal generators.

FM IF Alignment

Procedures for tuning the FM intermediate frequency stages for optimal performance.

FM RF Alignment

Instructions for aligning the FM radio frequency circuits using test equipment.

Component Location and Diagrams

Location of Main Parts

Identifies the physical placement of key components on the radio chassis.

Block Diagram

Illustrates the radio's internal circuit flow and component interconnections.

Detailed Circuit Diagrams

Schematic Drawing

Provides a comprehensive circuit diagram showing all electronic components and their connections.

Printed Circuit Board and Adjustments

Circuit Board Diagram

Shows the layout of components and traces on the printed circuit board.

Adjustment of Semi-Fixed Resistors

Instructions for adjusting trimmer potentiometers for optimal radio performance.

Parts and Specifications Lists

Parts List

A comprehensive listing of all components used in the radio.

Fixed Value Capacitors

Details specific capacitor values, types, and tolerances.

Electrolytic Capacitors

Lists electrolytic capacitors with their voltage, capacitance, and tolerance ratings.

AC Adaptor Specifications

Provides technical specifications for the optional AC adaptor (D12-815).