Meguro Electronics MSG-2560B User manual

1

Instruction Manual

ＭＳＧ－２５６０Ｂ

FM STANDARD SIGNAL GENERATOR

MEGURO ELECTRONICS CORPORATION

4-11-1, MINAMIKASE, SAIWAI-KU, KAWASAKI 212-0055, JAPAN

TEL : 044 ( 589 ) 0823
FAX : 044 ( 589 ) 0825

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Precautions for Use

1. The operating temperature range of the MSG-2560B is 0～40℃.

Therefore, avoid using it at temperatures below 0℃ or on top of heat-producing

equipment.

2. Avoid the following types of locations which can cause mechanical, chemical, or

other failures in the MSG-2560B

・ Locations subject to direct sunlight.
・ Locations subject to high temperatures and humidity.
・ Locations subject to high dust levels.
・ Locations subject to excessive vibration.
・ Locations subject to strong electromagnetic fields.

3. The MSG-2560B is provided with a VOLTAGE SELECTOR (see the figure of the

rear view panel) which enables selection of the line power voltage as
100/115/215/230VAC ±10%, 50/60Hz.

When changing the AC line voltage, always verify that the VOLTAGE SELECTOR
has been set to the proper AC line voltage. When changing this VOLTAGE
SELECTOR, always turn the POWER switch OFF (extended position) before doing
so.

4. A 30-minute warmup period should be allowed for the MSG-2560B.

5. If the OUTPUT cable connected to the OUTPUT connector is connected to a circuit

having a voltage of 3.5Vp-p or greater, there is a danger of burning out the resistors
in the output attenuator. This, therefore, should be avoided.

3

TABLE OF CONTENTS

1 OUTLINE ......................................................................................................... 4

1.1 GENERAL DESCRIPTION ....................................................................................... 4

1.2 FEATURES ............................................................................................................ 4

1.3 ACCESSORIES ....................................................................................................... 5

2 SPECIFICATIONS .......................................................................................... 6

3 OUTER APPEARANCE AND OPERATIONAL DESCRIPTION .............. 9

3.1 FRONT PANEL LAYOUT ......................................................................................... 9

3.2 REAR PANEL LAYOUT ..........................................................................................12

4 OPERATION .................................................................................................. 14

4.1 SETTING OF FREQUENCY ....................................................................................14

4.2 SETTING OF OUTPUT LEVEL ................................................................................21

4.3 SETTING OF MODULATION ..................................................................................25

4.4 USING MEMORY ..................................................................................................35

5 OUTPUT IMPEDANCE AND USING THE DUMMY ANTENNA ......... 42

5.1 RANGE OUTPUT PIN CONNECTOR ...................................................................42

5.2 MO-2951 BAND SPLITTING FILTER .....................................................................43

5.3 MO-2952 CAR RADIO DUMMY ANTENNA .............................................................46

5.4 MO-2953A AND －2953B OUTPUT AND IMPEDANCE SWITCHES ..........................50

6 REMOTE CONTROL .................................................................................... 55

6.1 USING EXTERNAL REMOTE CONTROL .................................................................57

6.2 OUTPUTTING THE INTERNAL MEMROY ADRS DISPLAY VALUE .........................64

7 BACKUP BATTERY ...................................................................................... 65

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1 OUTLINE

1.1 General Description

The MSG-2560B is an FM-AM signal generator which covers the 100kHz～

110MHz range. It is ideal for both FM and AM broadcast receiver
measurements and features a recall function and numerical entry function
which enhance ease of operation.
The output level is －19～99dBμ (0.11μVrms～89mVrms) and this may be

varied in 1dB steps, all settings being made digitally. It is possible to store
four independent levels and recall them as required.
0～99.5kHz FM modulation and 0～60% AM modulation are possible.

Ease of operation is ensured by center-type recall (100 memory point)
function increment keys, a fine adjustment control and a ⊿ (delta) f key.

Numerical entry keys are provided to enable the storage of any desired
frequency, output, and modulation level, and the fine adjustment control
provides the familiar analog feel of conventional signal generators. The ⊿

1.2 Features

display is extremely useful in deviation measurements.
Remote control is performed by coding of key operations and fine controls.
Input of clock pulses and remote control signals is made at a 14-pin
connector provided on the rear panel, and several signal lines are provided
to enable further functional expansion.

・ All operations are microprocessor controlled and set values are digitally

displayed for extremely easy operation.

・ All panel operations may be stored in memory (up to 100 points) and

recalled when necessary.

・ 6-Digit digital setting of frequency is possible and a PLL provides high

stability.

・ A cursor may be moved to any frequency digit to provide continuous

incremental control and ⊿f display is also possible.

・ Stepping of frequency, output level, and modulation is possible.

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・ The output level may be varied over the wide range of －19～99dBμ

Item

Model

Qty.

Remarks

Output cable

MC-2051-B

1

50 BNC connector terminated

Fuses

2 1A or 0.5A

Instruction
manual

1

・ 22.5kHz and 75kHz FM as well as 30% AM modulation may be selected by

・ Front panel controls may be remotely controlled.

1.3 Accessories

(open circuit) in 1dB steps using a 2-digit digital setting and four
independent levels may be stored in memory.

preset keys.

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2 SPECIFICATIONS

Frequency

Range 100kHz～110MHz

Display 6-Digit digital display
Incremental with ⊿f function

Accuracy ±5×10－5
Setting Value ENTER and INCREMENT keys and cursor

Output

Level range －19～99dBμ, open circuit
(0.11μVrms～89mVrms)

Display 2-Digit display with a 1dB resolution
Accuracy 0～99dBμ : ±1.0dB
－19～0dBμ : ±2.0dB
Flatness 400kHz～110MHz : ±1dB
100kHz～400kHz : ±1.5dB

and increment knobs

Memory 4 Independent storable/recallable memories
Signal source impedance 50Ω, VSWR less than 1.2

Leakage protection No effect on output level performance
Spurious output less than －30dB (2nd order)
Residual modulation For an 80Hz～20kHz modulation bandwidth:

FM Components : 17Hz or less
S/N : Over 73dB for a 75kHz deviation
AM Components : Less than 0.03%
S/N : 60dB or greater for 30% modulation
Setting Value ENTER and INCREMENT keys and cursor

and increment knobs

Modulation Both internal and external modulation for FM and

AM.

Simultaneous FM-AM modulation is not possible.
(FM)
Frequency deviation 0～99.5kHz, 1～110MHz

Less than 1MHz : Carrier frequency x 10%
Display 3-Digit display (lowest digit in 0.5kHz steps)
Accuracy ±10% of maximum indicated value

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Internal modulation 400Hz, 1kHz ±3%

frequencies
External modulation

Frequency 20Hz～100kHz ±1dB (1kHz reference)

characteristics 50dB or better separation at 1kHz

Input impedance Approx. 10kΩ, unbalanced

Input voltage 3Vpeak ±2% zone

Distortion With a modulation frequency of 1kHz, a

demodulation bandwidth of 80Hz～20kHz, and a

75kHz deviation:

0.05% or less at 10.7MHz and 65～110MHz, and

0.1% or less at other frequencies

Setting Value ENTER, INCREMENT and 25.5kHz and

75kHz preset keys.
(AM)
Modulation range 0～60%

Display 3-Digit display, lowest digit in 0.5% steps
Accuracy ±5% of modulation
Internal modulation 400Hz and 1kHz ±3%

frequencies
External modulation

Frequency 20Hz～10kHz ±1dB (1kHz reference)
characteristics (400kHz～110MHz)
Input impedance Approx. 10kΩ, unbalanced
Input voltage 3Vpeak ±2% zone
Distortion The demodulation bandwidth of 20Hz ～ 20kHz,

modulation frequency of 1kHz and 30% modulation:

0.5% or less at 400kHz～30MHz and 1.5% or less at

other frequencies.

Setting Value ENTER, INCREMENT and 30% preset key

Remote control Recall of stored frequencies, output levels, and

modulation as well as incrementing of stored
frequency and output level (continuous adjustment)

Modulation on/off control
Dummy antenna switching Frequency ≧ 35MHz : 1 (5V max, 50mA)

output Frequency < 35MHz 0

8

Battery backup Provided internally
Power supply 100/115/215/230VAC ±10%, 50/60Hz

Approx. 30VA (switched by a power supply switch

on the rear panel)
Maximum dimensions Approx. 430(W)×115(H)×295(D)mm

Weight Approx. 8kg
Operating temp. range 0～40℃

Accessories

Output cable (MC-2051-B) This output cable is used to connect the device

under measurement to the OUTPUT connector. It
has a 50Ω characteristic impedance, is 80cm long

and is terminated in BNC connectors.

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3 OUTER APPEARANCE AND OPERATIONAL DESCRIPTION

3.1 Front Panel Layout

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① POWER

AC Line power on/off switch.

② EXT.LEVEL HI,LO

Display of external modulation input level. Normal modulation is obtained when
both HI and LO are extinguished.

③ MODULATION : 3-Digit display which indicates the FM and AM modulation index.

kHz : FM Frequency deviation in kHz. Minimum step size of 0.5kHz.
% : AM Nodulation index in %. Minimum step size 0.5%.

④ RCL ENTER Key : Line recall.

BL STO ENTER Key : STORES a line.
BL STO ↑ : Increments the stored column.
RCL ・ : These keys clear the recalled line and column, at which point the ENTER

keys can be used to select any line and point the ENTER keys can be used to select
any line and column for recall.
BL STO ・ : These keys clear the store line and column, at which point the ENTER

keys can be used to store the set value.

⑤ MEMORY ADRS

Display of line number (00～99) of the matrix arranged memory.

⑥ ↑ : Increments recalled column.

↓ : Decrements recalled column.

⑦ ⊿FREQ

Lights when frequency deviation is displayed.

⑧ FREQUENCY

Display of frequency and frequency deviation.

⑨ LEVEL

RF Output level display.

⑩ STO RCL

Four independent preset points Memory keys.

⑪ OUTPUT

RF Signal output connector －19～＋99dBμ (open circuit)
Signal source impedance : 50Ω

⑫ ↑ INCR ↓

These keys increment or decrement the set value and may be used as repeat keys
as well.

⑬ Increment Knob

Varies the RF output at the cursor position.

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⑭ ↑ INCR. ↓

These keys increment or decrement the set value and may be used as repeat keys
as well.

⑮ ← →

Cursor movement keys.

⑯ Increment Knob

This knob is used to vary the digits at the cursor position and above.

⑰ ⊿FREQ

Indicates frequency deviation.

⑱ MHz, kHz, %, dB

Unit entry keys.

⑲ ENTER

Numerical entry keys.

⑳ FREQ. : Frequency setting key.

LEVEL : RF Output level setting key.
FM : Fm Deviation setting key.
AM : Am Modulation index setting key.

BL

This key is used to operate functions together with other keys in flue letters.

↑ INCR ↓

These keys increment or decrement the FM/AM modulation index.

MOD. ON

Modulation on/off key.

EXT. 400Hz, 1kHz

Internal/external switching of FM and AM modulation.

EXT. MOD. Input

External modulation input connector.

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3.2 Rear Panel Layout

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EXT. MOD. INPUT

It is possible to locate the panel external modulation input connector in this
position (before shipment of the unit).

REMOTE CONTROL

This connector is provided to enable remote control of front panel key operations. It
enables control of all panel functions.

Cord Hangers

Keep the power cord held when the MSG-2560B is carried or not in use.

FUSE

AC Line fuse. The proper fuse rating should be used for the voltage supplied.

VOLTAGE SELECTOR

This is the AC line voltage selector.
The plug is inserted so that the arrow points to the desired AC line voltage.

RANGE OUTPUT (RCA-Type Pin Connector)

For a carrier frequency in the range 35～110MHz, the output is ‘1’ with an output

voltage of 5V (50mA current, maximum).
In the range 100kHz～34.9999MHz, the output is ‘0’. Thus, this signal can be used

a car radio dummy antenna and output impedance switching control signal.

ACINPUT

AC Power input connector.

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4 OPERATION

First, connect the power cable to a line power source of the proper voltage and
press the POWER switch. When power is applied, the display that appears is the
same as when the power was turned OFF.

4.1 Setting of Frequency

4.1.1 Inputting Values Directly Using the ENTER Keys

First press the FREQ key, then input the frequency setting using the
ENTER keys (0～9, ・). Key operations are performed in the 1 2 3 sequence

shown in the figure above. When doing this, up to 7 digits will be accepted,
anything exceeding that being ignored.
If a mistake is made while pressing the ENTER keys, push the FREQ key
once more, then push the value ENTER keys and finally the MHz or kHz
unit key to complete the unit setting input. If the wrong unit key is pressed,
it is not necessary to return to the FREQ key. Correction can be made using
the ENTER keys and correct unit key (MHz or kHz)

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(Example 1)

Setting the frequency to 12.3456MHz. In the setting sequence below, X indicates
any arbitrary display and indicates a blank display digit.

Key operation FREQUENCY Display
FREQ. ×××．××× Same as before

1
2
・
3
4
5
6 １２．３４５６
MHz １２．３４５．６

(Example 2)

Inputting a frequency of 10MHz

Key operation FREQUENCY Display
１２．３４５．６
FREQ. １２．３４５．６

1
0 １０

MHz １０．０００．０

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(Example 3)

Setting the frequency to 85.7MHz and making an error in this setting.

Key operation FREQUENCY Display
FREQ １０．０００．０

8
6 6 pressed ８６

instead of 5

FREQ. １０．０００．０

As long as neither MHz nor kHz is pressed, the frequency display will remain
unchanged.

8
5 ８５
・
7
MHz ８５．７００

(Example 4)

Setting a frequency of 1MHz and erroneously inputting 11MHz.

Key operation FREQUENCY Display
FREQ.

1
1

MHz １１．０００．０

1

MHz １．０００．０

As shown above, if an error is made during the entry of a numerical value and
the FREQ key is pressed as well as the units key, it is possible to eliminate the
pressing of the FREQ key.

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4.1.2 FREQ. INCR Setting

The FREQ INCR INCR keys may be set to any arbitrary step size
(minimum size being 100Hz), thus enabling the increase and decrease of
frequency setting. When performing this setting, the position of the cursor
in the FREQUENCY display has no significance.

As shown in the figure above, the setting should be made in the sequence 1
2 3 4.

(Example)

Setting the FREQ INCR to 9kHz.

Key operation FREQUENCY Display

FREQ
INCR. SET

9
kHz
INCR. (Pressed once)

To continuously increase or decrease frequency in 9kHz steps, press the
INCR and keys, respectively, continuously to execute a repeated step of
frequency.

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4.1.3 Using the Increment Knob

The increment knob is used to increase and decrease the digit of the
FREQUENCY display over which the cursor is located.

(Example 1)

Changing from 100MHz to 100.02MHz (indicates the cursor position.)

Key operation FREQUENCY Display

１００．０００

← Press once １００．０００

Turn the １００．０２０

increment
knob 2
steps CW

(Example 2)

Changing from 100.02MHz to 98.02MHz.

Key operation FREQUENCY Display

１００．０２０

← Press once １００．０２０
Turn the ８．０２０

increment
knob 2

steps CCW

When using the increment knob, it is not necessary to press the MHz or
kHz keys.

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4.1.4 Using the ⊿FREQ Frequency Deviation Key

This function is used to view the frequency change and is extremely useful
in such measurements as those of the bandwidth of a receiver.
The display will indicate the results of calculations as follows.

・ Fo is the frequency displayed immediately prior to pressing the ⊿

FREQ key.

・ F is the frequency change displayed after pressing the ⊿FREQ key

and then either the FREQ INCR key or turning the increment knob.
⊿FREQ=F－Fo
Therefore, if F=1MHz and F=98.5MHz, ⊿FREQ=－1.5MHz, when the
FREQ is pressed, the FREQ indicator of the ⊿FREQ display will

light.

(Example)
Assume a currently displayed frequency of 100MHz.

Key Operation FREQUENCY Display
１００．０００……………Fo

FREQ.

INCR. SET

1

MHz

INCR.↓ ０００

Turn ５００

increment
knob 5
steps CCW.

⊿FREQ indicator will light and the
display will read －1.5MHz.

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To cancel the ⊿FREQ function, press the ⊿FREQ key once more.

FREQ F
If the INCR ↑↓ keys are pressed continuously, the function will

repeat continuously, changing the frequency in 1MHz steps.
In this example, before pressing the INCR SET key, if LEVEL, FM and
AM keys or key other than the ⊿FREQ key are set, incrementing will

not be possible.
Therefore, before pressing the ⊿FREQ key, the step should be set

using the FREQ and INCR SET keys.

4.1.5 Other Key Settings

(a) MAX INCR. Key

When the BL key (unmarked blue key) is pressed simultaneously with
the MAX key, the maximum settable frequency (110MHz) is displayed.

(b) MIN INCR. Key

When the BL key is pressed simultaneously with the MIN key, the
minimum settable frequency step value (0.1Hz) is displayed.

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4.2 Setting of Output Level

4.2.1 Direct Numerical Input Using the ENTER Keys

Pressing the LEVEL key and then the ENTER numerical keys (0～9, －),

the desired numerical value may be input.
Input is made in the sequence 1 2 3, as shown above.
During a key input sequence, if any key other than those encircled with
is pressed, the numerical value immediately prior to pressing the
LEVEL key will be displayed.
When the numerical input is completed, press the dB key, and the correct
display will appear in the LEVEL display.

(Example 1)

Setting a level of 7dB

Key Operation LEVEL Display
LEVEL ×× Same as before
7
dB

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(Example 2)

Setting a level of －5dB.

Key Operation LEVEL Display

LEVEL

－
5 －５
dB －５

This key need not be pressed when continuous
settings are made.

(Example 3)

Making an error while setting a level of 12dB.

Key Operation LEVEL Display

LEVEL －5

1
3 １３

LEVEL －５

1
2 １２
dB １２

If a numerical setting error has been made and the dB key has been pressed input
is possible using the numerical value ENTER keys.
When levels are set that are outside the minimum and maximum values possible,
the display will return to its previous value.

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4.2.2 Using the LEVEL INCR. Setting

The LEVEL INCR. INCR. ↓↑ keys may be set to any arbitrary step size

(minimum: 1dB), enabling the output level to be increased and decreased.

The input setting is made in the sequence 1 2 3 4, as shown above.

(Example)

Setting the LEVEL INCR. to 2dB.

Key Operation LEVEL Display

LEVEL －５
INCR. SET －５

2
dB －５

INCR. Press －３

Once

To continuously change the level in 2dB steps, press the INCR ↑↓ to

affect a repeated function.
In addition, if the BL key is pressed simultaneously wit the MAX key,
the maximum settable level will be displayed, and if the BL and MIN
keys are pressed simultaneously, the minimum settable level will be
displayed.

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4.2.3 Using the Increment Knob

The increment knob may be used to increase and decrease the output
level with a minimum step size of 1dB. When turned clockwise, it
increases the level and when turned counter-clockwise, it decreases the
level.

4.2.4 Using the Four Independent Memories

The four keys (A～D) shown in the above figure are independent from

the main memory (see Section 4.4) and correspond to memory assignable
to output levels only.
To store, press the blue key and one of the A～D keys, in this sequence.
It is possible to store the presently displayed output level of any key A～
D. Essentially, the memory address becomes one of the A～D keys and,

to recall, one of these keys is pressed.
Note that these four memories have no effect whatsoever on the main
memory.

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4.3 Setting of Modulation

4.3.1 Inputting Using the Numerical Keys

Input is made in the sequence 1 2 3, as shown above.
First, the MODULATION FM or AM key is pressed.
When this is done, the currently set modulation is displayed, along with
units, on the MODULATION display.
Next, the numerical ENTER keys (0～9,・) are used to set the desired input

value. When the desired input value is completely entered, press the kHz
key for FM modulation or the % for AM modulation and the modulation will
be displayed, along with units, on the MODULATION display.
While any value may be input using the numerical keys (0～9,・), both FM

and AM have a maximum of 99.5 and minimum of 0.5. Therefore, when the
kHz and % keys are pressed, inputs in the range ××.0～××.4 will be
changed to ××.0, while inputs in the range ××.5～××.9 will be changed
to ××.5 before actually being entered.

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(Example 1)

Setting the FM modulation to 67.5kHz.

Key Operation MODULATION Display

1kHz
FM ××．×………………………Previously set value
6
7 ６７
・
5 ６７．５

1kHz
kHz ６７．６

(Example 2)

Now, set 30% AM modulation.

Key Operation MODULATION Display

AM ××．×………………………Previously set value
１%

3
0 ３０
% ３０．０

１%

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4.3.2 Using MODULATION INCR.

By pressing the INCREMENT ↑↓ keys, the modulation index may be

increased and decreased by a previously set step value. If the key is pressed
continuously, a repeated increment is affected.

Setting is made in the sequence 1 2 3 4 5, as shown above.

(Example 1)

Setting FM INCR. to 2.5kHz.

Key Operation MODULATION Display

1kHz
FM ７５．０
INCR. SET ７５．０

2
・ ２．
5

1kHz
kHz ７５．０

28

(Example 2)

Setting FM INCR. to change the FM deviation to 67.5kHz.

Key Operation MODULATION Display
1kHz

INCR. ７２．５
INCR. ７０．０
INCR. ６７．５

Each time the INCR. ↓ key is pressed, the value set using the INCR.

SET is increased or decreased. This is the same for AM INCR.

4.3.3 Setting the Modulation Source

When the modulation source selection keys are pressed, the associated
LED lights.
The key 1 turns the modulation on/off. Each time it is pressed, the on/off
modes are alternately selected.

29

(Example 1)

Change from internal 400Hz FM modulation to 75kHz deviation.

Key Operation － 400kHz Lights

400Hz 1kHz
FM ××．×

7
5 ７５

1kHz

kHz ７５．０

(Example 2)

Turning modulation OFF.

Key 1 is pressed, and the LED goes out, indicating the OFF condition.
At this time, the display appears as follows.
1kHz

０．０

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4.3.4 Connecting the External Modulation Signal Source

(a) Connect an AF signal source to the EXT. MOD. INPUT connector and

press the EXT. key.

(b) The AF signal source level should be adjusted so that both the EXT.

LEVEL HI and LO indicators on the MODULATION display are
extinguished.
If the AF signal source level is excessively low, the LO indicator will
light and if the level is excessively high, the HI indicator will light.
Note that changing the level of modulation does not require changing
the level of the AF signal source.

4.3.5 Using the Blue Key

(a) Pressing BL 22.5kHz selects 22.5kHz FM modulation.
(b) Pressing BL 75kHz selects 75kHz FM modulation.
(c) Pressing BL 30% selects 30% AM modulation.
(d) Pressing BL MAX displays the maximum setting value (99.5).
(e) Pressing BL MIN displays the minimum setting value (0.5).

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4.3.6 Setting the Stereo Signal Source

(a) Description of Setting Range

DIGITAL SETTING VALUE
The above figure indicates the modulation input level relationships.
If the input level is adjusted to within the HI-LO range, the setting
value error will be ±2%. Using this HI-LO level as references, the

modulation is digitally set internally. This HI-LO range used peak
values for both single and complex waveforms and, as shown in the
level. For example, if the input level is set in the range between HI
and LO, after setting the display to 75kHz deviation, if the input level
is attenuated －6dB, with a display of 75kHz=100%, the deviation will

be 37.5kHz=50%. In this condition, while the LO 1amp will light,
normal modulation will be achieved.
Also, if the input level is set in the range between HI and LO, the HI
and LO 1amps will go out.
However, there are cases in which switching the MAIN, LEFT, RIGHT,
and SUB of the stereo signal source will cause the HI and LO 1amps
to light alternately.
Since the HI-LO range is extremely narrow, these 1amps may light
alternately, however, this does not indicate an excessive error and does
not pose a problem.

32

(b) Setting the MSG-211FS Ⅱ

1. Turn the COMPOSITE LEVEL clockwise to the maximum position.

2. Set the OUTPUT SIGNAL MAIN & SUB to OFF and PILOT to ON. Set the

PILOT LEVEL adjustment to 10%.

3. Set the OUTPUT SIGNAL MAIN & SUB to ON and set the PILOT to OFF.

4. For an internal input, set AF IN OR INT. and set PRE-EMPHASIS ON, if

required.

5. Set the INTERNAL MODULATOR to, for example, 1kHz and with the

OUTPUT SIGNAL as MAIN, adjust the INTERNAL MODULATOR LEVEL
control to 90%.

6. Connector the OUTPUT of the MSG-211FS Ⅱ to the EXT.

MOD. INPUT of the MSG-2560B using a low-capacitance cable.

7. Set the OUTPUT SIGNAL PILOT to ON and adjust the COMPOSITE

LEVEL knob to within the EXT. MOD. HI-LO range of the MSG-2560B.
When doing this, although the meter indication on the MSG-211FS Ⅱ will

become small, the ratio does not change, and no problem will occur.

8. Set the deviation of the MSG-2560B to 75kHz=100%.

This will set MAIN=90%, PILOT=10%, for a total of 100%.

9. Switch between MAIN, LEFT, RIGHT and SUB on the MSG-211FS Ⅱ to

obtain stereo characteristics.

10. In steps 1～9, if the OUTPUT SIGNAL is set to ON and the PILOT is set to

OFF, the EXT. MOD. LO 1amp of the MSG-2560B will light, and MAIN will
be 90%, while PILOT will be 0%.

11. In steps 1～9 if the AM IN ATT 30% of the MSG-211FS Ⅱ is pressed,

although the MSG-2560B display remains as 75kHz, the EXT. MOD. LO
1amp will light and, at 30% modulation, MAIN=20.25kHz and
PILOT=7.5kHz.

33

(c) Setting the MSG-211G

1. Set PILOT to ON and FUNCTION and M&S to OFF.

2. Use the PILOT LEVEL trimmer to set the PILOT LEVEL to 10%.

3. Set FUNCTION MAIN and, to use internal input, set AF INT.

4. Set AF IN ATT to OFF and the INTERNAL MODULATOR to 1kHz. Adjust

the LEVEL knob to 90%.

5. Connect the OUTPUT of the MSG-211G to the EXT. MOD. INPUT of the

MSG-2560B, using a low-capacitance cable.

6. Set PILOT to ON and adjust the COMPOSITE LEVEL knob to within the

EXT. MOD. HI-LO range of the MSG-2560B.

7. Set the deviation of the MSG-2560B to 75kHz=100%.

This will set MAIN=90%, PILOT =10%, for a total of 100%.

8. Switch between MAIN, LEFT, RIGHT and SUB on the MSG-211G to obtain

stereo characteristics.

9. Also, in the MONO position, a setting of 75kHz=100% is also possible.

10. In step 1～8, if the PILOT of the MSG-211G is set to OFF, the EXT. MOD.

LO 1amp of the MSG-2560B will light and MAIN=90%, and PILOT=0%.

11. In steps 1～8, if the AF IN ATT 30% of the MSG-211G is pressed, although

the MSG-2560B display remains as 75kHz, the EXT. MOD. LO 1amp will
light and, at 30% modulation, MAIN=20.25kHz and PILOT=7.5kHz.

34

(d) Setting the MSG-2101

1. Set PILOT to ON and set FUNCTION to OFF.

2. Use the PILOT LEVEL trimmer to set the PILOT LEVEL to 10%.

3. Set PILOT to OFF and, with FUNCTION as MAIN, to use internal input

set INT. MOD. to 1000Hz and adjust the LEVEL knob to 90%.

4. Connect the COMPOSITE OUTPUT of the MSG-2101 to the EXT. MOD.

INPUT of the MSG-2560B, using a low-capacitance cable.

5. Set PILOT to ON and adjust the COMPOSITE LEVEL knob to within the

EXT. MOD. HI-LO range of the MSG-2560B.

6. Set the deviation of the MSG-2560B to 75kHz=100%.

This will set MAIN=90%, PILOT=10%, for a total of 100%.

7. Switch between MAIN, LEFT, RIGHT and SUB on the MSG-2101 to obtain

stereo characteristics.

8. Also, in the MONO position, a setting of 75kHz=100% is also possible.

9. In step 1～7, if the PILOT of the MSG-2101 is set to OFF, the EXT. MOD

LO 1amp of the MSG-2560B will light and MAIN=90%, and PILOT=0%.

10. In steps 1～7, if the MSG-2101 PILOT is set to OFF, with FUNCTION as

MAIN, if the INT. MOD. LEVEL is set to 30%, the MSG-2560B display will
remain as 75kHz, the EXT. MOD. LO 1amp will light, and with 30%
modulation MAIN=20.25kHz and PILOT=7.5kHz.

35

4.4 Using Memory

９０

８０

７０

６０

５０

４０

３０

２０

１０

０９

０８

０７

０６

０４

０３

０２

０１

００

０５

･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･

９９

･ ･ ･ ･ ･ ･ ･ ･

MEMORY ADRS． LED

4.4.1 Memory Recall

Memory is arranged in a matrix configuration. Essentially, this consists of
lines 0～9 vertically and columns 0～9 horizontally, for a total of 100

points. The memory arrangement is shown below.

The basic recall operation is performed by calling the line number using
the RCL and ENTER numerical keys and calling the step numbers
(columns) in sequence using the key. To recall any row and column
number, use the RCL key and the ENTER key group key to clear the
currently displayed row and column, enabling any specification to be
made for the previously displayed row and column numbers.
In the examples given below, the frequency, output, modulation index, and
other settings are made as described in Section 4.1～4.3, and stored into

memory following the procedure given in Section 4.4.2.

36

(Example 1)

Recalling the address (1) (0)
MEMORY ADRS
RCL key, ENTER 1 key (1) (0)

(Example 2)

Recalling address (4) (3)

Press the ENTER 4 key and the MEMORY ADRS key three times.
(4) (3)

(Example 3)

Recalling address (8)(5).

Press the ENTER 8 key and the MEMORY ADRS key five times.
(8) (5)
When performing the recall operation continuously, after pressing the RCL key
once, it is not necessary to press again.

(b) Using the to recall any address.

(Example 4)

Recalling address (5)(6) directly.
Pressing the RCL and ENTER・key extinguishes the LED.

The ENTER keys are pressed to enter the address (5) (6).
(5) (6)
Next, recall (7) (8).
Use the ENTER・key and the LED will go out.

Press the ENTER keys to enter (7)(8).
(7) (8)
When recalling continuously, after the RCL key is pressed one time, it is not
necessary to press it again.

37

4.4.2 Storing Into Memory

As described in Section 4.4.1 on the recall method, the memory is
arranged in a matrix configuration, enabling virtually all panel functions
to be stored in memory. Note, however, that the frequency, output, the
various modulation increment steps, and the ⊿FREQ functions may not

be stored in memory.
The basic store operation consists of setting the frequency, output,
modulation index, mode and other information and pressing BL, STO,
ENTER numerical keys and finally the MEMORY UP key to the desired
step number.
Also, the BL, STO, and ENTER・keys may be used to extinguish the

MEMORY ADRS. LED display, after which a 2-digit numerical value is
input using the ENTER keys, enabling the direct input of column and row
numbers.

38

(Example 1)

Storing a frequency of 1MHz, the cursor kHz digit, an output level of 99dBμ, a

modulation of INT 1kHz 30% AM into address (1) (0).

1 Key Operation FREQUENCY Display

FREQ ЧЧЧЧЧЧ

1

Cursor

MHz ００００

is pressed ００

3 times

The INCR. ↑↓ and the increment knob may also be used to set the frequency.

2 Key Operation LEVEL Display

LEVEL ××

9
9 ９９

dB ９９

The INCR. ↑↓ and four preset points may be used to set the output also.

3 Key Operation MODULATION Display

BL ×××
30% ３０．０１%
1kHz ３０．０１

The ENTER, INCR. ↑↓ and modulation mode keys may also be used to set the

modulation level and mode.
With the above setting, the BL, STO, and 1 ENTER keys are used to store into
address (1) (0).
Next, let us store a different item into address (1) (3).

39

MEMORY STEP NUMBER
ADDRESS Display

1 Press RCL 1 two (1) (2)

times.

2 Set the frequency, output,

modulation and other
information

3 Press the BL STO keys. (1) (3)

Storage into memory address (1) (3) is made at step 2.

(Example 2)

Storing into memory address (4) (5).

1 Set the frequency, output, modulation and other information.
2 Press the BL, STO, and ENTER ・ keys; the LED will go out.

3 Use the ENTER keys to input address (4) (5) and store the conditions set at

step 1.

(Notes)

1. For continuous storage, it is possible to eliminate pressing the BL, STO, and

ENTER・keys.

2. The RTN key described in Section 4.4.3 may not be used for storing using

direct storage.

40

4.4.3 Storing Into Memory Without Using All Steps (RTN Key)

(Example)

Assume that storage in the sequence (1)(0)→(1)(1)→(1)(2)→(1)(3)→(1)(0)
→(1)(1) is to be performed.

MEMORY STEP NUMBER
Key Operations ADDRESS Display

RCL 1 (3 times) (1) (3)
BL STO RTN (1) (4) The return

command is
input.

(Method)

RCL 1 (1) (0) 1st Memory
(1) (1) 2nd Memory
(1) (2) 3rd Memory
(1) (3) 4th Memory
(1) (0) Return to
1st memory

(Canceling the RTN Key)

Press RCL 1 (1) (3)
Press BL STO (1) (4)
keys
・ ・
・ ・

・ ・
・ ・
・ ・

Press 5times. (1) (9)
The address is incremented as shown above.

41

4.4.4 Recalling More Than 10 Steps

Normal recall is of 10 steps at a time (00～09, 10～19, …90～99). The

following procedure, however, can be used to increment memory in 10 step
units.
With the MEMORY display at (09), (19), … or such values up to (89), to

proceed with continuous memory storage (BLUE, STO, MEMORY), it is
possible to recall the next 10 steps.

(Example)

Recalling memory steps (30) (49) continuously.

Key operation MEMORY Display
× 39 Previous display

BLUE 39
STO 39 STO LED Light
MEMORY 40 STO LED goes out

The recall operation is as follows.

(30)→(31)→…→(39)→(40)→(41)→…→(49)

(Canceling Method)

To clear the MEMORY display, set the memory to (09), (19), … or (89)

and press the key sequence BLUE, STO, RTN.

(Example)

To return the condition at which continuous storage in memory (30)～
(49) to storage in memory (30) ～ (39) and (40)～ (49), the following

procedure is performed.

Key operation MEMORY Display
× 39 Previous display

BLUE 39
STO 39 STO LED Light

RTN 30 STO LED goes out

42

5 OUTPUT IMPEDANCE AND USING THE DUMMY ANTENNA

5.1 RANGE OUTPUT Pin Connector

With the carrier frequency in the range 35.000～110MHz, a ‘1’ output (5V

the current of 50mA, maximum) is available, and with a carrier frequency
in the range 100kHz～34.999.9, the output is ‘0’.

This signal can be used as a control signal for a car radio dummy antenna
(MO-2952, MO-2952A) or output impedance switch (MO-2953A,
MO-2952A).
The 50mA output current available is intended to enable the drive of two
reed relays.

43

5.2 MO-2951 Band Splitting Filter

Using a combination of a highpass filter and a lowpass filter, the output
signal is divided.
There is no need to use the RANGE OUTPUT control signal of the
MSG-2560B.
An example of use of this Band Splitting Filter are shown in Fig. 1 and
outer views of the Band Splitting Filter are shown in Fig. 2 (page 44).
This Band Splitting Filter operates without errors in the range below
30MHz and in the range 75～110MHz, the errors occurring outside these

ranges being shown in Fig. 3 on page 45.

Fig. 1

44

MO-2951 Band Splitting Filter Specifications
Input frequency range DC～130MHz
Input/output impedance 50Ω (BNC-J connector)

VSWR Input/output 1.2 or lower
Output frequency range AM: DC～30MHz
FM: 75～130MHz

Insertion loss 0.5dB or less

Fig. 2

45

Fig. 3

46

5.3 MO-2952 Car Radio Dummy Antenna

This dummy antenna is for use as a load antenna in testing of car radios. It
conforms to JIS standard C6102-1978 and is controlled by the 0V and 5V
levels output at the RANGE OUTPUT of the rear panel of the MSG-2560B.

MO-2952…………… 50Ω AM and 75Ω FM output loads
MO-2952A………… 75Ω open circuit output for both AM and FM

The method of use is shown in Fig. 4, the circuit diagrams in Fig. 5 and Fig.
7 (pages 47 and 49), while the outer views are shown in Fig. 6 (page 47) and
Fig. 8 (page 49).

Fig. 4

5.3.1 MO-2952 Car Radio Dummy Antenna (Load Terminated Type)

Input frequency range 50kHz～200MHz
Input impedance 50Ω (BNC-J connector)

VSWR 1.2 or less
Output AM: 0V
FM Car radio dummy: 75Ω

Control signal AM: 0V
FM: 5V (50mA or less)
Control connector Audio pin connector, RCA type (provide)

47

5.3.2 Dummy Antenna Circuit Diagram

Fig. 5

(Note)

Of the 60pF AM car radio dummy antenna load capacitance, 30pF is
accounted for by stray capacitance within the unit.
The load capacitance should be adjusted to 60pF, including the car radio
dummy antenna cable capacitance.

Fig. 6

48

5.3.3 MO-2952A Car Radio Dummy Antenna (Open Circuit Terminated)

Input frequency range 50kHz～200MHz
Input impedance 50Ω (BNC-J connector)

VSWR 1.2 or less
Output AM Car radio dummy: 75Ω
FM Car radio dummy: 75Ω

Control signal AM: 0V
FM: 5V (50mA or less)
Control connector Audio pin connector, RCA type (provide)

49

5.3.4 Dummy Antenna Circuit Diagram

Fig. 7

(Note)

Of the 60pF AM car radio dummy antenna load capacitance, 30pF is
accounted for by stray capacitance within the unit.
The load capacitance should be adjusted to 60pF, including the car radio
dummy antenna cable capacitance.

Fig. 8

50

5.4 MO-2953A and －2953B Output and Impedance Switches

The MO-2953A uses a test loop for AM and a 50:300Ω dummy antenna for
the FM band, while the MO-2953B uses a test loop for AM in the 75:300Ω

dummy antenna for the FM band.
The method of use in shown in Fig. 9 and Fig. 10 (pages 50 and 51), while
circuit diagrams are shown in Fig. 11 and Fig. 12 (page 53). The outer views
are shown in Fig. 13 (page 54).

Fig. 9

51

Fig. 10

52

5.4.1 MO-2953A Output Switch and MO-2953B Output Impedance Switch
Specifications

Input frequency range DC～200MHz
Input impedance 50Ω (BNC-J connector)

VSWR 1.2 or less
Output

MO-2953A AM: 50Ω (for test loop)
FM: 50Ω (for 50:300Ω dummy)
MO-2953B AM: 50Ω (for test loop)
FM: 75Ω (for 75:300Ω dummy)

Control signal AM: 0V
FM: 5V (50mA or less)
Control connector Audio pin connector, RCA type
(provide)

53

5.4.2 Output Switch and Impedance Switch Circuit Diagrams

AM 50Ω

FM 50Ω

AM 50Ω

FM 50Ω

MLA-1001B
TEST LOOP

MLA-2106B
50:300Ω DUMMY

MLA-1001B
TEST LOOP

MLA-2104B
75:300Ω DUMMY

25Ω

MO-2953A

Fig. 11

MO-2953B

Fig. 12

54

Fig. 13

(Note)

When using the MO-2951 or the MO-2953A/B, make connections as shown in Fig.

14. A 50:50Ω dummy for AM and a 50:300Ω unbalanced dummy antenna for the

FM band may be connected to the FM/AM radio.
At point A, the FM band dummy balance is lost.

Fig. 14

55

6 REMOTE CONTROL

The MSG-2560B has a 14-pin connector used to enable remote control. The pin
arrangement, as seen from the rear panel is as shown in Fig. 15.

Fig. 15

・ DATA (Pins 1～6, 13 and 14)

The DATA pins form a bi-directional bus which enables input/output. The
internal CPU bus drives the panel bus and the panel bus is connected to the
remote control pins.
(Note)
Since the DATA pins form a bi-directional bus, if a ‘0’ or ‘1’ is directly
connected to DATA lines 1・8, the generator will not operate.

56

・ Input Control (Pins 11 and 12)

・READ/WRITE Switching Output (Pin 12)

For reading this pin outputs a ‘0’, and for writing it outputs a ‘1’.

・INTERRUPT Input (Pin 11)

When set to ‘0’, the remote control mode is temporarily enabled as a form
of request from an external device.

・ OUTPUT Control (Pins 9 and 10)

・CLOCK Output (Pin 10)

This clock signal provides the timing used for data output.

・ADRS/DATA Switching Output (Pin 9)

Address is specified by ‘1’ and data is specified by ‘0’.

・ ＋5V Pin (pin 8)

This is the power supply used for remote control. It provides a maximum
current capacity of 100mA (LED up to approx. 2 digits).

・ GND Pin (Pin 7)

57

6.1 Using External Remote Control

Since the data lines on the remote control connector comprise a
bi-directional bus, when performing remote control, it is recommended that
the additional circuit shown in Fig. 16 be used.

Fig. 16

There are eight data input bits at the external control connector. The 7th bit
(pin 14) is held at ‘0’ and the 8th bit (pin 13) is held at ‘1’ through a CMOS
4503B device and data is transmitted.
Key code data (See Fig. 16) is applied at the key code DATA inputs shown in
the table in accordance with the input data timing (see Fig. 17, page 58),
data is sent by setting the DATA VALID pin to ‘0’.

58

6.1.1 Input Data Timing

Fig. 17

As shown in Fig. 17, DATA 1～6 are set and a wait of 10 s or greater is

held after the last data has stabilized, at which point the DATA VALID
signal is held at ‘0’ for 1ms or greater.
The next data and DATA VALID signal are sent at least 70ms after the
previous data.

59

6.1.2 Panel Key Code Table

Key Code Input Pin No.

6 5 4 3 2

1

Key No.

Description

MSB←Key Code →LSB

1

EXT.MODULATION

0 1 1 0 0 0 2

INT. 400Hz

0 1 1 0 0 1 3

INT. 1000Hz

0 1 1 0 1 0 4

INCR. UP

1 0 0 0 0

0

5

INCR. DOWN

1 0 0 0 0

1

6

BLUE KEY

1 0 1 1 1

1

7

MOD. ON／OFF

1 0 0 1 0

1

The front panel keys are all coded to correspond with codes as shown in
the table below. By sending DATA VALID, the same operation is possible
as pressing the corresponding panel key.

60

Key No

Description

MSB ← Key Code → LSB

8

ENTER INCR.SET.

1 0 1 1 0

0

9

ENTER LEVEL

1 0 1 0 0

1

10

ENTER FREQ.

1 0 1 0 0 0 11

ENTER FM

1 0 1 0 1 0 12

ENTER AM

1 0 1 0 1

1

13

MEMORY ADRS RCL／STO

1 0 1 1 0

1

14

MEMORY UP

1 0 1 1 1 0 15

MEMORY DOWN

0 1 0 1 0 1 16

ENTER MHz

1 1 1 1 0 0 17

ENTER kHz

1 1 1 1 0 1 18

ENTER ％

1 1 1 1 1

0

19

ENTER dB

1 1 1 1 1

1

20

ENTER ・

1 1 1 0 1

0

21

ENTER 0

1 1 0 0 0

0

22

ENTER 1

1 1 0 0 0

1

23

ENTER 2

1 1 0 0 1

0

24

ENTER 3

1 1 0 0 1

1

25

ENTER 4

1 1 0 1 0

0

26

ENTER 5

1 1 0 1 0 1 27

ENTER 6

1 1 0 1 1 0 28

ENTER 7

1 1 0 1 1 1 29

ENTER 8

1 1 1 0 0 0 30

ENTER 9

1 1 1 0 0 1 31

ENTER －

1 1 1 0 1

1

61

Key No.

Description

MSB ← Key Code → LSB

32

ΔFREQ.

0 0 1 1 1

1

33

CURSOR LEFT

0 0 1 0 0 0 34

CURSOR RIGHT

0 0 1 0 0 1 35

LEVEL RCL A

0 1 1 0 1 1 36

LEVEL RCL B

0 1 1 1 0 0 37

LEVEL RCL C

0 1 1 1 0 1 38

LEVEL RCL D

1 0 0 1 0 0 39

LEVEL INCR. UP

0 1 0 0 1

0

40

LEVEL INCR. DOWN

0 1 0 0 1

1

41

LEVEL KNOB UP

0 0 0 0 1

1

LEVEL KNOB DOWN

0 0 0 1 0

0

42

FREQ. INCR. UP

0 0 1 0 1

0

43

FREQ. INCR. DOWN

0 0 1 0 1

1

44

FREQ. KNOB UP

0 0 0 0 0 0 FREQ. KNOB DOWN

0 0 0 0 0

1

62

6.1.3 Example of External Control

External control will be explained by using the simple example of
controlling externally the MEMORY UP key.
Referring to the panel key code table in Section 6.1.2, after 14, the
MEMORY ADRS key data ‘101110’ is applied to the key code data 1～6

(see Fig. 16, page 57) as shown in Fig. 18 and DATA VALID is connected.

Fig. 18

Each time the switch shown in Fig. 18 is pressed, the STEP NUMBER
display increments number 1 upward.
By changing the data to a different key code data, any single panel key
may be externally controlled in the same manner.

63

6.1.4 Example of Setting the Frequency Using Remote Control

This example sets the frequency to 82.55MHz.

(1) Set the panel key code FREQ code of ‘101000’, as shown in the key

code table (page 59).

(2) Using the DATA VALID data timing (page 58) shown in the timing

diagram, send this signal for 1ms or longer.

(3) As shown in Fig. 19, 82.5 is set according to the code table and the

DATA VALID signal is sent for at 1east 1ms.

Fig. 19

(4) Now, in the same manner, the 5 data ‘110101’ and DATA VALID are

sent.

(5) Finally, the data ‘111100’ for MHz and DATA VALID signal are sent,

thus completing the data transfer.

(6) From the time the last MHz data ‘111100’ and DATA VALID signal are

sent, internal processing within the MSG-2560B begins, requiring
approximately 60ms.

64

6.2 Outputting the Internal MEMROY ADRS Display Value

Fig. 20 illustrates this example.

Fig. 20

Since the remote control pin comprises a bi-directional bus, it is possible to
use a circuit such as shown in Fig. 20 to provide output, in the same manner
for MEMORY ADRS. If a latch is used instead of the CMOS 4513, the
MEMORY ADRS display may be used also as data.
If the circuit shown in Fig. 16 (page 57) and Fig. 20 are connected
separately at the connector section, in addition to external remote control, it
is possible to verify the MEMORY ADRS display as well as other data

65

7 BACKUP BATTERY

The MSG-2560B uses a battery to backup the memory, so that when the unit is
not used for long periods, it may be possible for the backup batteries to discharge.
A charging circuit is provided to ensure sufficient charge with the power applied
to the mainframe.
The memory backup battery is greatly affected by ambient temperature, humidity,
storage conditions and other factors.
It will retain approximately 90% of its capacity even after five years or so of use,
however. While this should provide normal operation, if a failure occurs, Sanyo
Denki CADNIC backup battery type N-SB3 should be used as a replacement.

Installation Position and Method of Replacement

If the top cover of the MSG-2560B is removed, four shielded cases are exposed to
view. Of these, a CPU board is located within the left-side shielded case, the
battery being located on this board, held with a band.
When exchanging this battery with a new one, the one screw on the left side is
removed as well as the four screws on the shielded case cover. Rotate the shielded
case CCW about the shaft passing from the front panel to the rear panel slightly
to the left (as seen from the front) of center and remove the case. Pull out the PC
board and replace the battery.
When battery replacement is completed, replace the shield case and, after
restoring the five screws, turn the POWER switch ON, and, using the access hole
at the top of the shielded case, press the initial setting pushbutton switch with a
screwdriver or other instrument to initialize the CPU.