Casio_AT-1_Service_Manual.pdf

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AT-1
INDEX
ELECTRIONIC KEYBOARD
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Replacing the DSP (HG51B155FD) . . . . . . . . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PCB View and Major Check Points . . . . . . . . . . . . . . . . . . . . . . . 14
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IC Lead Identification and Internal Diagram . . . . . . . . . . . . . . . . 19
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SPECIFICATIONS
General
Number of Keys:
Polyphonic:
Preset Tones:
Keyboard Controls:
Key Transpose:
Oriental Scale Control:
Scale Memories:
Auto-Rhythms:
Auto-Accompaniment:
Magical Presets:
61
32-note
100
Tone Expander: Layer, Split
Touch Response: On/Off
Touch Sensitivity: Light/Middle/Heavy
Range from F# to F by a semitone increment
Tune: On/Off, Mode: Cent/Koma
Tuning Rang: Quarter tone (±99 cents) and
koma
(±5
komas)
4
50
Tempo Control: 40 to 255
CASIO Chord/Fingered/Full-Range Chord
Controller: Variation, Fill-In, Intro/Ending
50; BREAK BEAT
20
FREE SESSION 24
KEY SPLIT
6
10; Reverb-1, Reverb-2, Reverb-3, Chorus, Tremolo, Phase Shifter,
Organ SP, Enhancer, Flanger, EQ Loudness
4
32; Phrases: 10, Drums: 10, Percussion: 10, Controllers: 2
1;
System: Real-time recording
Memory Capacity: Approx. 700 notes
Bend Range; 2 semitones/3 semitones
6
Tone Number, Rhythm Number, Tempo, Accompaniment Mode,
Accompaniment Volume, Effects, Layer On/Off, Split On/Off,
Chord On/Off, Accompaniment Scale On/Off, Pad Variation,
Assignable Jack, Auto-Accompaniment Controller, MIDI (Channel On/Off,
GM On/Off, Local Control On/Off, Bend Range)
440Hz
±
50 cents
Headphone Jack [Output Impedance: 150
Ω,
Output Voltage: 5.2 V(rms)
MAX], Assignable Jack, MIDI Jacks (IN, OUT), AC Adaptor Jack (9 V)
12 cm dia. 2.5 W Input Rating: 2 pcs.
2-way AC or DC source
AC: AC adaptor AD-5
DC: 6 D size dry batteries
Battery life: Approx. 5 hours by manganese batteries R20P(SUM-1)
Approximately 6 minutes after the last operation
7.7 W
129 x 942 x 367 mm
5-1/16 x 37-1/16 x 14-7/16 inches
5.3 kg (11.7 lbs) excluding batteries
Music stand, Dust cover
Digital Effects:
Sound/Control Pads:
Pad Variations:
Song Memory:
Pitch Bender:
Registration Memories:
Registration Items:
Tuning Control:
Terminals:
Built-In Speakers:
Power Source:
Auto Power Off:
Power Consumption:
Dimensions (HWD):
Weight:
Standard Accessory:
—1—
Electrical
Current Drain with 9 V DC:
No Sound Output
Maximum Volume
with key C3 pressed in Synth-Bass tone and effect No. E-9
Split: On, Layer: On, Oriental scale: On/Cent
Song memory: Play, Volume; maximum, Touch: maximum
Line Output Level (Vrms with 47 KΩ load each cannel):
with key F2 pressed in FSynth-Bass tone
Phone Output Level (Vrms with 8
Ω
load each channel):
with key C3 pressed in FSynth-Bass tone
Speaker Input Level:
with key C3 pressed in FSynth-Bass tone
Minimum Operating Voltage:
260 mA
±
20%
930 mA
±
20%
2480 mV
±
20%
97 mV
±
20%
2240 mV
±
20%
6.3 V
REPLACING THE DSP (HG51B155FD)
Note: To increase productivity ,the DSP HG51B155FD is sticked on the main PCB with a double-side
adhesive tape, then its leads are soldered.
Remove the DSP according to the following procedures.
1. Prepare isopropyl alcohol and a flat IC desoldering machine (Spot Heater HS-600).
2. Apply plenty of the alcohol to the adhesive tape from the reverse side of the main PCB. (Fig.1)
There is a hole on the PCB just under the LSI, and the adhesive tape can be seen through the hole.
3. Leave it more than one minute so that the alcohol weaken adhesive power fully.
4. Using a proper size of nozzle, apply heat to leads of the LSI with the desoldering machine.
5. Grasp the LSI with tweezers, and using gentle force vibrate the tweezers to feel melting solder. (Fig.2)
6. Remove the LSI after meltingsolder at every leads wholly.
Spot Heater HS-600
Alcohl
A
115
51A
HG
I-S
LS
Fig.1
Fig.2
—2—
BLOCK DIAGRAM
La ~ Lg, Lp
Reset IC
IC104
RE5VA35AA
7-Seg.
LED
LEDs
LC1 ~ LC4
LED driver
IC301/302
BA612
LO0 ~ LO4
Keyboard
Working Strage
RAM (64K-bit)
LSI104
SRM2264LC90,10
KC0 ~
KC7
LED driver
Q109 ~ Q116
CLK
KO
KO Signal
Generator
IC303/304
TC74HC174P
KO0 ~ KO10
LD0 ~ LD7
RESET
KI1 ~ KI7
CPU
Buttons
VDD
POWER
FI0 ~ FI7
SI0 ~ SI7
A0 ~
A12
D0~D7
Key Touch LSI
LSI106
HG52E35P
A0 ~ A2
LSI102
HD6433298A36P
A0 ~ A14
Power Switch
MIDI
OUT
IN
A0 ~ A3
Effect RAM
(64K-bit)
LSI107
SRM2264LC90,10
DSP
EA0 ~ EA12
LSI105
ED0 ~ ED7
HG51B155FD
RA0 ~ RA19
RD0 ~ RD15
Sound Source ROM
(16M-bit)
LSI103
TC5316200CP-C106
WCK1
SLOP
BCK
APO
D/A Converter
LSI101
UPD6376CX
VC
Output
Filter
IC105
Filter
IC105
LVDD
VCC
AVDD
DVDD
VDD
Speakers
Main
Volume
Power Supply Circuit
IC101, Q1 ~ Q4
Power Amplifier
IC102
LA4598
—3—

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