Read Panasonic RR-US490PP / RR-US490E Service Manual online
Power requirement :
DC 3.0 V (2 AAA size/LR03
batteries)
Power output :
300 mW (max.)
Frequency response :
300 Hz to 5,000 Hz (HQ mode)
300 Hz to 3,400 Hz (FQ/SP mode)
S/N :
37 dB (HQ mode)
Output jack :
Earphone, ø 3.5 mm (1/8 in.); 0.5
mW 16
Ω
Input jack :
Mic, ø 3.5 mm (1/8 in.); 0.56 mV
plug in power
Speaker :
20 mm (25 /32 in.) 8
Ω
Dimensions (W x H x D) :
Max dimensions :
39.3 mm x 105.5 mm x 17.2 mm
(1 9/16 in. x 4 5/32 in. x 11/16 in.)
Cabinet dimensions :
38.8 mm x 105 mm x 14 mm
(1 17/32 in. x 4 1/8 in. x 9/16 in.)
RR-US490PP
RR-US490E
Colour
(K)..........Black Type
Mass (Weight) :
With dry cell batteries :
Approx. 62 g or 2.17 oz
Without batteries :
Approx. 39 g or 1.37 oz
Operational temperature range :
0 °C to 40 °C (32 °F to 104 °F)
Memory capacity (MB means one million bytes. Usable capacity will
be less.) :
be less.) :
512 MB
Operating Humidity :
20 % to 80 % (non-condensing)
Battery life :
[When used at 25 °C (77 °F) on a
flat, stable surface]
The battery life may be less depending on the operating conditions.
Notes :
1. Specifications are subject to change without notices.
Product ldentification Marking is located on the bottom of unit.
IC Recorder
Specification
ORDER NO. MD0805026CE
A1
1
Safety Precautions
3
2
Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
4
3
Handling the Lead-free Solder
5
4
Operating Procedures
6
5
Assembling and Disassembling
12
6
Voltage Measurement & Waveform Chart
17
7
Wiring Connection Diagram
20
8
Block Diagram
21
9
Notes Of Schematic Diagram
23
10 Schematic Diagram
25
11 Printed Circuit Board Diagram
29
12 Illustration of IC’s, Transistors and Diodes
31
13 Exploded Views
33
14 Replacement Parts List
35
CONTENTS
Page
Page
2
RR-US490PP / RR-US490E
1 Safety Precautions
1.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.2. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
• No sound is heard when the power is turned on.
• Stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
• Stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.3. Safety Part Information
Safety Parts List:
There are special components used in this equipment which are important for safety.These parts are marked by
in the
Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should be replaced with manufacturer’s
specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer.
specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer.
Table 1
Reference No.
Part No.
Part Name & Description
Remarks
ICP2
D4FBR7500008
RESETTABLE FUSE
[M]
ICP101
ERBSE1R50U
RESETTABLE FUSE
[M]
3
RR-US490PP / RR-US490E
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium
foil, to prevent electrostatic charge build up or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or
comparable conductive material).
comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD)
sufficient to damage an ES device).
sufficient to damage an ES device).
4
RR-US490PP / RR-US490E