Akai AM M5 M7 Service Manual

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Akai AM M5 M7 Service Manual

Extracted text from Akai AM M5 M7 Service Manual (Ocr-read)


Page 23

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7-4. FM SECTION ADJUSTMENT (Refer to Figs. 7-2, 3)

' Adjustment T Adjustment Test l '
:tfp Item Point Point Rm“ Remarks
FM Tuning Selector to FM, Display to
1 Voltage L4 TP4 3.0V 88MHZ, Digital Volt Meter
(Low) Between TP4 & GND.
FM Tuning
2 Voltage VC4 TP4 20V Display to 108MHz
(High)
Mode to Mono. 88MHz, lkHz
3 EX??? ”5’ 3 Output Less than 6dB (Mono, 100%) Input, 3%
s 1 y DISTORTION FACTOR
I 108MHz, lkl-lz (Mono, 100%)
4 £16335? VC1, 2, 3 Output Less than 6dB Input, 3% DISTORTION
ensi 1V1 y FACTOR
Center Tuning Meter Between
FM Center TP7 Centered TP7 & TPS, (see NOTE l)
5 V lt T2 TPS Tuning Meter Tunes only noise Without
0 age Indication interference from Broadcast-
ing
Distortion ' 98Ml-lz, 60dB, lkHz (Mono,
6 Factor T3 Output Less than 0.3% 100%) Input
pg
7 Féee Runmng VRZ TP9 l9kHziSOHz 98MHZ Non-Modulation Sig—
quuency n 31 Input
98MHz, 60dB, lkHz (Stereo,
Stereo 100%) LCH (RCH) Input,
8 Separation VR} Output More than 40dB RCH (LCH) output to Mini—
Q mum

NOTE: 1. The center tuning meter such as the ones used on model AA-RZO, 30, 40, 50>& AT-2400, 2600 can be

used for this adjustment.

If it is not available, use a digital meter (DC VOLTAGE, RANGE 20V) instead, and adjust T2 so that
it indicates 0V at the same condition.

2. For the best result, repeat step 1 through 8 for two or three times.

SERVICE MANUAL AT-MS / L

21

Page 34

2—3. OPERATION OF AMPLIFIER SECTION CONTROL IC AA-l 00 PERIPHERAL CIRCUIT
2-3-1. Display Data V
2-3-2. Digit Output of AA-100
2-3-3. Description of Input Selector
1) FUNCTION SWITCHING
2) TAPE MONITOR SWITCHING
2-3-4. Operation of Electronic Volume Control and Tone Control
1) OPERATION OF VOLUME CONTROL
2) SERIAL TRANSFER DATA
2-36. Composition of Volume IC TC9154P and Tune Control (Bass Treble) lC TC9156P
1) INTERNAL BLOCK DIAGRAM _ L
2) ATTENUATOR OF TC9154P
3) INTERNAL BLOCK DIAGRAM OF TC9156P (BASS TREBLE)
4) VARIABLE RESISTOR 0F TC9156P
S) OPERATION
6) UP/DOWN OPERATION OF VOLUME CONTROL
8) UP/DOWN OPERATION OF BASS AND TREBLE
9) BALANCE CONTROL
10) OPERATION OF FADER
23—6. The Status that will be Established When Reset Button is Pressed
2—3-7. Reset Status when Power is on
2-3-8. How to make Letters

*For the description of the above circuit which is identical to Model AA-R22/32/42, see the service manual for AA-22/
32/42.

SERVICE MAN UAL‘AT-MS /L

31

Page 41

II. DISMANTLING OF UNIT

In case of trouble, etc. necessitating dismantling, please
dismantle in the order shown in the phogographs.
Reassemble in reverse order.

SCREWS

SCREWS

b
‘ FRONT PANEL
SCREWS

UPPER COVER

38

SERVICE MANUAL AM-M5 /M7