Yamaha DA-824 Service Manual
SERVICE MANUAL
PA
011524
HAMAMATSU, JAPAN
1.44K-4111 K Printed in Japan '00.05
CONTENTS
SPECIFICATIONS···································································· 3
PANEL LAYOUT······································································· 4
CIRCUIT BOARD LAYOUT······················································ 5
DIMENTIONS ··········································································· 6
BLOCK DIAGRAM···································································· 7
DISASSEMBLY PROCEDURE················································· 8
LSI PIN DESCRIPTION·························································· 11
IC BLOCK DIAGRAM ····························································· 13
CIRCUIT BOARDS································································· 15
INSPECTIONS········································································ 27
TEST PROGRAM··································································· 29
FRASH ROM UPGRADE························································ 32
PARTS LIST
OVERALL CIRCUIT DIAGRAM
DA CONVERTER
200005**-110000
This document is printed on chlorine free (ECF) paper with soy ink.
DA824
2
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly
other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
WHAT SO EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes
to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling
food.
IMPORTANT NOTICE
This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that
basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by
the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components and failure of the product to perform as specified. For these
reasons, we advise all Yamaha product owners that all service required should be performed by an authorized
Yamaha Retailer or the appointed service representative.
IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization, certification,
recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form.
The data provided is belived to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and
service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and
changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist,
please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the
unit.
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT. The wires in this main lead are coloured in
accordance with the following code:
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the main lead of this apparatus may not
correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:
The BLUE wire must be connected to the terminal that is marked with
the letter N (or coloured BLACK).
The BROWN wire must be connected to the terminal that is marked
with the letter L (or coloured RED).
Be certain that neither core is connected to the earth terminal of the
three pin plug.
SPECIFICATIONS
DA824
3
MY8-AE, MY8-TD
Sampling rate
MY8-AT
DA conversion resolution
Frequency response
Dynamic Range *
1
Gain Error
THD *
2
Hum & Noise Level *
1
Crosstalk
Signal Delay
PEAK
NOMINAL
Indicators SIGNAL
LOCK
POWER
Power requirements
Power consumption
Dimensions (W x H x D)
Weight
Free-air operating temperature
Storage temperature
Power cord length
Supplied Accessories
39.69–50.88 kHz
41.013–50.88 kHz
24-bit linear, 128-times oversampling
–3, +1 dB, 20 Hz–20 kHz
110 dB (typical)
±1 dB @ 1 kHz
0.05%, 20 Hz–20 kHz
0.01% full scale output @ 1 kHz
–92 dB (typical)
–70 dB between adjacent channels @ 1 kHz
0.57 ms (digital input to analog output, fs = 48 kHz)
3 dB below full scale
14 dB below full scale
34 dB below full scale
Wordclock lock
Power on/off
U.S.A. & Canada 120 V AC, 60 Hz
Europe 230 V AC, 50 Hz
40 W
480 x 97.5 x 366.8 mm (18.9 x 3.84 x 14.44 inches)
7.5 kg (16.53 lbs)
10˚ C to 35˚ C (50˚ F to 95˚ F)
–20˚ C to 60˚ C (–4˚ F to 140˚ F)
1.9 m
Owner's Manual
*1. Measured with a 6 dB/octave filter at 12.7 kHz; equivalent to a 20 kHz filter with infinite dB/octave attenuation.
*2. 6 dB/octave filter @ 80 kHz.
* Where dB represents a specific voltage, 0 dB is referenced to 0.775 V rms, 0 dBV is referenced to 1.00 V rms.
*1. 24-bit 128-times oversampling D/A converters.
*2. XLR-type connectors are electronically balanced (pin 1= ground, pin 2= hot, pin 3= cold).
*3. TRS phone jacks are electronically balanced (tip= hot, ring= cold, sleeve= ground).
* Where dB represents a specific voltage, 0 dB is referenced to 0.775 V rms, 0 dBV is referenced to 1.00 V rms.
Analog Output
Connection GAIN SW
Actual Source
Impedance
For Use
with
Nominal
Connector
Output Level
Nominal
Max.
before clip
OUTPUT 1–8 *
1
150 Ω lines 600 Ω lines
+24 dB
+18 dB
+15 dB
+4 dBV
+10 dB
(2.45 V)
+4 dB
(1.23 V)
+1 dB
(0.87 V)
–10 dBV
(0.316 V)
+24 dB
(12.28 V)
+18 dB
(6.16 V)
+15 dB
(4.36 V)
+4 dBV
(1.58 V)
XLR-3-32
type
(balanced)*
2
&
TRS phone
jack
(balanced)*
3
Digital I/O
Connection
COM
WORD CLOCK IN
WORD CLOCK THRU
SLOT
Format
—
—
—
mini YGDAI
Level/Impedance
RS232C
TTL, 75 Ω (ON/OFF)
TTL, 75 Ω
—
Connector
9-pin D-sub (male)
BNC
BNC
—
ON OFF
POWER
DA CONVERTER
LOCK
PEAK
SIGNAL
NOMINAL
PEAK
SIGNAL
NOMINAL
12345678
1 2 3 4
SLOT
COM
THRU
75 IN
ON OFF
WORD CLOCK
DA CONVERTER
MODEL DA824
8 234567
8 234567 1
OUTPUT
(BAL)
1
5 6 7 8 9
10 11
1
PEAK, NOMINAL & SIGNAL indicators
2
LOCK indicator
3
POWER indicator
4
POWER switch
5
COM port
6
WORD CLOCK THRU connector
7
WORD CLOCK 75 ON/OFF switch
8
WORD CLOCK IN connector
9
OUTPUT (BAL) connectors
10
Power cable
11
SLOT
PANEL LAYOUT
DA824
4
Front Panel
Rear Panel
DA824
5
CIRCUIT BOARD LAYOUT
DA
DC
PN SW
JK
MAIN
MYSL
3NC2-V536450
3
CN004
CN905
CN902
CN003
CN001
CN011
CN962 CN961
CN963
CN010 CN008
CN009
CN005
CN006
CN002
CN007
CN002
CN102
CN101 CN301 CN501 CN701
CN302 CN502 CN702
CN901
CN904
CN052 CN053
CN054
CN051
CN906
CN003
AC
MYSL
Power Transformer
DA824
6
DIMENTIONS
67.5 67.5345
430
13
88
H: 97.5
2
30
230
48
(33)
274
355
D: 366.8
W: 480
Unit: mm
DA824
7
WORD CLOCL
SELECT
IC917
44P
YM3436DK
(DIR2)
WORD CLOCL
SELECT
D.F/DA
AK4393
IC918
44P
IC002
28P
IC101 IC102 IC102
IC103
IC103
IC203
IC203
OUTPUT 1
JK101
JK102
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
LOCK
SYNC.Fs.64Fs.128Fs.256Fs
YM3436DK
(DIR2)
WORD CLOCK
IN
THRU
75
IC902
IC923
SDATA
PD
VOUTL
VOUTR
BICK
LRCK
MCLK
6
5
7
6
5
7
2
3
1
2
3
1
6
5
7
MUTE
MUTE
JK201
JK202
IC201 IC202 IC202
OUTPUT 2
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
2
3
1
2
3
1
6
5
7
2
3
1
6
5
7
MUTE
MUTE
JK301
JK302
D.F/DA
AK4393
IC003
28P
IC301 IC302 IC302
IC303
IC303
IC403
IC403
OUTPUT 3
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
SDATA
PD
VOUTL
VOUTR
BICK
LRCK
MCLK
6
5
7
6
5
7
2
3
1
2
3
1
6
5
7
MUTE
MUTE
JK401
JK402
IC401 IC402 IC402
OUTPUT 4
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
2
3
1
2
3
1
6
5
7
2
3
1
6
5
7
MUTE
MUTE
JK501
JK502
D.F/DA
AK4393
IC004
28P
IC501 IC502 IC502
IC503
IC503
IC603
IC603
OUTPUT 5
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
SDATA
PD
VOUTL
VOUTR
BICK
LRCK
MCLK
6
5
7
6
5
7
2
3
1
2
3
1
6
5
7
MUTE
MUTE
JK601
JK602
IC601 IC602 IC602
OUTPUT 6
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
2
3
1
2
3
1
6
5
7
2
3
1
6
5
7
MUTE
MUTE
JK701
JK702
JK801
JK802
D.F/DA
AK4393
CPU
COM
SRAM 256K
IC005
28P
IC909
CN903
IC901
IC926
SRAM 256K
IC927
IC701 IC702 IC702
IC703
IC703
IC803
IC803
OUTPUT 7
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
SDATA
PD
VOUTL
VOUTR
BICK
LRCK
MCLK
6
5
7
6
5
7
2
3
1
2
3
1
6
5
7
MUTE
MUTE
IC801 IC802 IC802
OUTPUT 8
SIGNAL
+4dBV
15dBU
18dBU
24dBU
LPF
NOMINAL
PEAK
2
3
23
21
22
23
1
2
3
1
6
5
7
2
3
1
6
5
7
MUTE
MUTE
KEC-92537
RST
MUTE
LOCKWCLK SLTWCLK BNC A(1-10)
D(0-15)
TR,RX
TR,RX
FLASH MEMORY
8M
IC919
LOCK
POWER
SYNC
Fs
64Fs
128Fs
256Fs
WCLK
SDATA
A(1-10)
D(0-15)
TR,RX
SLOT
MUTE
BA
BA
SH7042A
112P
DA JK
MAIN
14 13
71
3,4
6
36 15
11
6~10
15~182~5
19
44
50,51
43 87
89
84
104,105
5
6
4
73
23
21
22
23
5
6
4
73
23
21
22
23
5
6
4
73
23
21
22
23
5
6
4
73
BLOCK DIAGRAM
DA824
8
DISASSEMBLY PROCEDURE
DA
JK
<Top View>
Top cover
Power transformer
IF plate
[180]
[360]
[180]
[420]
[290] [380] X16[280] [A]
[400] X14
[300]
[400]: Bind Head Tapping Screw-B A4.0X8 MFZN2BL (VC688800)
(Fig. 1)
<Rear View>
[420]: Bind Head Screw A4.0X12 MFZN2BL (VP156900)
(Fig. 2)
[350]
MAIN
1. Top Cover
1-1 Remove the fourteen (14) screws marked [400]. The top
cover can then be removed. (Fig. 1)
2. Circuit Boards and Units
Remove the top cover, each circuit board and unit can
then be removed.
Circuit Board and Unit
MAIN
JK
DA
DC Assembly
Power Transformer
A
280
290
300
380
350
360
200
180
Screw
Bonding Screw 4.0X8 MFZN2BL (VS154500)
Bonding Screw 3.0X6 MFZN2BL (VS863000)
Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
Bonding Tapping Screw 3.0X8 MFZN2BL (VN41330)
Bonding Tapping Screw 3.0X8 MFZN2BL (VN41330)
Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
Bind Head Tapping Screw-B A4.0X6 MFZN2BL (VC688800)
Bind Head Tapping Screw-B A4.0X6 MFZN2BL (VC688800)
2
1
2
5
16
6
4
2
4
Ref. No. Screw QTY
2
2
2
1
2
2
1
3
1
Fig.
3. MYSL Circuit Board
* Note that remove card before following operation.
3-1 Remove the top cover. (See procedure 1.)
3-2 Remove the MAIN circuit board. (See procedure 2.)
3-3 Remove the two (2) screws marked [420]. The IF plate
can then be removed. (Fig. 2)
3-4 Remove the four (4) screws marked [250]. The OPT
assembly can then be removed. (Fig. 3)
3-5 Remove the two (2) screws marked [240]. The MYSL
circuit board can then be removed. (Fig. 3)
DA824
9
<Top View>
[250]
[240]
[110] X2
Fuse
[240]
[200]
DC assembly
OPT assembly
[200]
MYSL
AC
AC
[250]
[240]: Bind Head Screw 4.0X8 MFZN2BL (EG340360)
[250]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
(Fig. 3)
[60A]: Bind Head Tapping Screw-B A4.0X8 MFZN2BL (VC688800)
[110]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
(Fig. 4)
• Rear Panel Assembly
[60A] X3
4. AC Circuit Board
4-1 Remove the top cover. (See procedure 1.)
4-2 Remove the three (3) screws marked [60A] and the two
(2) screws marked [110]. The AC circuit board can then
be removed. (Fig. 4)
* The fuse is not a part of the AC circuit Board. When you
replace the AC circuit board, you should remove the fuse
from the board, and put it back into the holder on the new
board.
5. DC Circuit Board
5-1 Remove the top cover. (See procedure 1.)
5-2 Remove the DC assembly. (See procedure 2.)
5-3 Remove the four (4) screws marked [60B]. The transistor
holder can then be removed. (Fig. 5)
5-4 Remove the three (3) screws marked [40]. The DC circuit
board can then be removed. (Fig. 5)
* The four fuses are not part of the DC circuit Board. When
you replace the DC circuit board, you should remove the
fuses from the board, and put it back into the holder on the
new board.
6. PN Circuit Board and SW Circuit Board
6-1 Remove the top cover. (See procedure 1.)
6-2 Remove the six (6) screws marked [130]. The right and
left rack mount angles can then be removed. (Fig. 6)
6-3 Remove the six (6) screws marked [70]. The front panel
can then be removed. (Fig. 7)
[60B]
[40]
[130]
[130]
[130]
DC
[40]: Bind Head Tapping Screw-B A3.0X8 MFZN2BL (VP157000)
[60B]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
(Fig. 5)
[130]: Oval Head Screw 4.0X8 MFZN2BL (VS153600)
(Fig. 6)
• DC Assembly
[40]
[40]
Transistor holder
Rack mount angle
Rack mount angle
<Right View>
<Left View>
[130]
Fuse
Fuse
[70]
PN
SW
[70]: Oval Head Screw 4.0X8 MFZN2BL (VS153600)
(Fig. 7)
[30]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[50]: Bonding Screw 3.0X6 MFZN2BL (VS863000)
<Front View>
[70]
[30] [50]
[50]
[30]
[70][70]
Front panel
[30]
DA824
10
6-4 PN Circuit Board:
Remove the four (4) screws marked [30]. The PN circuit
board can then be removed. (Fig. 7)
6-5 SW Circuit Board:
Remove the two (2) screws marked [50]. The SW circuit
board can then be removed. (Fig. 7)
DA824
11
LSI PIN DESCRIPTION
PIN
NO.
I/O FUNCTIONNAME
PIN
NO.
I/O FUNCTIONNAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
DAUX
HDLT
DOUT
VFL
OPT
SYNC
MCC
WC
MCB
MCA
SKSY
XI
XO
P256
LOCK
Vss
TC
DIM1
DIM0
DOM1
DOM0
KM1
I
O
O
O
O
O
O
O
O
O
I
I
O
O
O
O
I
I
I
I
I
Auxiliary input for audio data
Asynchronous buffer operation flag
Audio data output
Parity flag output
Fs x 1 Synchronous output signal for DAC
Fs x 1 Synchronous output signal for DSP
Fs x 64 Bit clock output
FS x 1 Word clock output
Fs x 128 Bit clock output
Fs x 256 Bit clock output
Clock synchronization control input
Crystal oscillator connection or external
clock input
Crystal oscillator connection
VCO oscillating clock connection
PLL lock flag
Logic section power (GND)
PLL time constant switching output
Data input mode selection
Data input mode selection
Data output mode selection
Data output mode selection
Clock mode switching input 1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
RSTN
Vdda
CTLN
PCO
(NC)
CTLP
Vssa
TSTN
KM2
KM0
FS1
FS0
CSM
EXTW
DDIN
LR
Vdd
ERR
EMP
CD0
CCK
CLD
I
I
O
I
I
I
I
O
O
I
I
I
O
O
O
O
I
I
System reset input
VCO section power (+5V)
VCO control input N
PLL phase comparison output
VCO control input P
VCO section power (GND)
Test terminal. Open for normal use
Clock mode switching input 2
Clock mode switching input 0
Channel status sampling frequency
display output 1
Channel status sampling frequency
display output 0
Channel status output method selection
External synchronous auxiliary input
word clock
EIAJ (AES/EBU) data input
PLL word clock output
Logic section power (+5 V)
Data error flag output
Channel status emphasis control code
output
3-wire type microcomputer interface data
output
3-wire type microcomputer interface clock
input
3-wire type microcomputer interface load
input
YM3436DK (XG948E00) DIR2 (Digital Format Interface Receiver)
MAIN: IC917, 918
PIN
NO.
I/O FUNCTIONNAME
PIN
NO.
I/O FUNCTIONNAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DVSS
DVDD
MCLK
/PD
BICK
SDATA
LRCK
SMUTE//CS
DFS
DEM0/CCLK
DEM1/CDTI
DIF0
DIF1
DIF2
-
I
I
I
I
I
I
I
I
I
I
I
I
Digital ground
Digital power supply
Master clock
Power down mode
Audio serial data clock
Audio serial data input
L/R clock
Soft mute
Double speed sampling mode
De-emphasis enable
Digital input format
15
16
17
18
19
20
21
22
23
24
25
26
27
28
BVSS
VREFL
VREFH
AVDD
AVSS
AOUTR-
AOUTR+
AOUTL-
AOUTL+
VCOM
P//S
CKS0
CKS1
CKS2
I
I
-
O
O
O
O
O
I
I
I
I
Substrate ground
Low level voltage reference
High level voltage reference
Analog power supply +5 V
Analog ground
Rch negative analog output
Rch positive analog output
Lch negative analog output
Lch positive analog output
Common voltage output
Parallel/serial select
Master clock select
AK4393-VS-E2 (XW029A00) DAC (Digital to Analog Converter)
DA: IC2-5
DA824
12
PIN
NO.
I/O FUNCTIONNAME
PIN
NO.
I/O FUNCTIONNAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
PE14
PE15
VSS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
VCC
A17
VSS
/RAS
/CASL
/CASH
VSS
RDWR / PB5
A18
A19
A20
PB9 /A21
VSS
/RD
/WDTOVF
/WRH
VCC
/WRL
VSS
/CS1
/CS0
PA9 / TCLKD
/IRQ2 / TCLKC
/CS3
/CS2
/IRQ1
TXD
RXD
/IRQ0
PA1 / TXD0
PA0 / RXD0
D15
D14
D13
VSS
D12
O
O
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
I
O
O
O
O
O
O
O
O
O
I
O
O
O
I
O
I
O
O
O
I
O
O
I
O
I
I
O
I
I/O
I/O
I/O
I
I/O
Port E
Port E
Ground
Address bus
Power supply
Address bus
Ground
Row address strobe
Column address strobe (low)
Column address strobe (high)
Ground
DRAM read/write / Port B
Address bus
Port B / Address bus
Ground
Read
Watch dog timer overflow
High write
Power supply
Low write
Ground
Chip select
Chip select
Port A / Timer clock
Interrupt request / Timer clock
Chip select
Chip select
Interrupt request
Data transmission
Data reception
Interrupt request
Port A / Data transmission
Port A / Data reception
Data bus
Ground
Data bus
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
D11
D10
D9
D8
VSS
D7
D6
D5
VCC
D4
D3
D2
D1
D0
VSS
XTAL
MD3
EXTAL
MD2
NMI
VCC
MD1
MD0
PLLVCC
PLLCAP
PLLVSS
PA15 / CK
/RES
PE0
PE1
PE2
PE3
PE4
VSS
AN0 / PF0
AN1 / PF1
AN2 / PF2
AN3 / PF3
AN4 / PF4
AN5 / PF5
AVSS
AN6 / PF6
AN7 / PF7
AVCC
VSS
PE5
VCC
PE6
PE7
PE8
PE9
PE10
VSS
PE11
PE12
PE13
I/O
I/O
I/O
I/O
I
I/O
I/O
I/O
I
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
I
I
I
I
I
I
I
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
O
I
O
O
O
O
O
I
O
O
O
Data bus
Ground
Data bus
Power supply
Data bus
Ground
Crystal oscillator
Mode control
Crystal oscillator
Mode control
Non-maskable interrupt request
Power supply
Mode control
Mode control
PLL Power supply
PLL capacitor
PLL Ground
Port A / Clock
Reset
Port E
Ground
Analog input / Port F
Analog ground
Analog input / Port F
Analog input / Port F
Power supply
Ground
Port E
Power supply
Port E
Ground
Port E
HD6477042AF28 (XY721A00) CPU MAIN: IC909
IC BLOCK DIAGRAM
HD74LV04AFPEL (IS000400)
HD74LVU04AFPEL (XY102A00)
Hex Inverter
MAIN: IC911,915
HD74LV08AFPEL (IS000800)
Quad 2 Input AND
MAIN: IC912
HD74LV32AFPEL (IS003200)
Quad 2 Input OR
MAIN: IC928
HD74LV74AFPEL (IS007400)
Dual D-Type Flip-Flop
MAIN: IC914
SN74LV138ANSR (IS013810)
3 to 8 Demultiplexer
MAIN: IC913
SN74LV139ANSR (IS013910)
Dual 2 to 4 Demultiplexer
MAIN: IC920
TC74HC153AFEL (XY309A00)
Dual 4 to 1 Data Selectors
MAIN: IC910
HD74LV245AFPEL (IS024500)
Octal 3-State Bus Transceiver
MAIN: IC901,903-905,907,908,924
DA: IC101
HD74LV273AFPEL (IS027300)
Octal D-Type Flir Flop
MAIN: IC922
1
2
3
4
5
6
7
1A
1Y
2A
2Y
3A
3Y
Vss
14
13
12
11
10
9
8
VDD
6A
6Y
5A
5Y
4A
4Y
1
2
3
1A
1Y
42A
52B
62Y
7
VSS
1B
14
13
12
VDD
4A
11 4Y
10 3B
9 3A
8 3Y
4B
1
2
3
1A
1Y
42A
52B
62Y
7GND
1B
14
13
12
Vcc
4A
11 4Y
10 3B
9 3A
8 3Y
4B
INPUTS OUTPUTS
PR CLR CLK D Q Q
L
H
H
L
H
Q
O
H
L
H
H
L
Q O
X
X
X
H
L
X
X
X
X
f
f
L
H
L
L
H
H
H
L
H
L
H
H
H
1
2
3
4
5
6
7
1CLR
1D
1CK
1PR
1Q
1Q
GND
14
13
12
11
10
9
8
VCC
2CLR
CLR
2D
D
2CK
CK
2PRPR
2Q
2Q
Q
Q
CLR
D
CK
PR
Q
Q
1
2
3
4
5
6
7
A
A
Select
Enable
Output
Output
B
B
C
C
G2A
G2A
G2B
G2B
G1
G1
Y7
Y7 Y5
Y4
Y3
Y2
Y1
Y0
Y6
16
15
14
13
12
11
10
Vcc
YO
Y1
Y2
Y3
Y4
Y5
8
GND
9
Y6
1
2
3
4
5
6
7
1G
1A
1B
1Y0
1Y1
1Y2
1Y3
A
G
B
Y0
Y1
Y2
Y3
16
15
14
13
12
11
10
Vcc
2G
2A
2B
2Y0
2Y1
2Y2
8
GND
9
2Y3
Y2
Y3
Y1
Y0
B
A
G
1
2
3
4
5
6
7
1G SELECT
STROBE B
OUTPUT 1Y
1G
IC3
IC2
IC1
IC0
1Y
16
15
14
13
12
11
10
Vcc
SELECT 2G
STROBE A
8
GND
9
OUTPUT 2Y
2C0
2Y
2C1
2C2
2C3
2G
B
B
B
B
A
A
A
A
DATA
INPUTS
DATA
INPUTS
1
2
3
4
5
6
7
20
19
18
17
16
15
14
Vcc
G
B1
B2
B3
B4
B5
B6
B7
B8
8
9
10
12
11
GND
A8
A7
A6
A5
A4
A3
A2
A1
D1R
13
CLEAR
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
VCC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLOCK
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
Q
DCK
CL
D
Q
CK
CL
Q
DCK
CL
D
Q
CK
CL
D
Q
CK
CL
Q
DCK
CL
D
Q
CK
CL
Q
DCK
CL
DA824
13
DA824
14
SN75121NSR (XU816A00)
Dual Line Driver
MAIN: IC923
SN75124NS (XN976A00)
Triple Line Receiver
MAIN: IC902
SN75C1168NSR (XU073A00)
Line Driver / Receiver
MAIN: IC906
NJM2068D-D (XA987A00)
NJM2068MD-T1 (XJ553A00)
NJM4556AL (XP844A00)
Dual Operational Amplifier
PN: IC101,301,501,701
DA: IC101-103,201-203,301-303,401-403,
501-503,601-603,701-703,801-803
Vcc
2F
2E
2A
2Y
GND
1Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2C
2B
2D
1A
1B
1C
1D
1E
1F
1A
1B
2R
2S
2A
2B
2Y
GND
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8 9
Vcc
1S
1R
1Y
3A
3S
3R
3Y
1
2
3
4
5
6
7
1B
1A
1R
1DE
2R
2A
2B
16
15
14
13
12
11
10
Vcc
1D
1Y
1Z
2DE
2Z
2Y
8
GND
9
2D
1
2
3
4-V
8
7
6
5
Output A +V
Non-Inverting
Input A
-DC Voltage Supply
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+-
+-
3NA-V485540
AC cord
Power transformer
POWER
ON/OFF
2
3NA-V485500
AC, SW(H,W,B):
AC, SW(J,U,V):
2
AC cord
Power transformer
POWER
ON/OFF
DA824
15
CIRCUIT BOARDS
AC Circuit Board (H,W,B) (XY032C0) ······································································· 15
AC Circuit Board (J, U, V) (XY031C0)······································································· 15
DA Circuit Board (XY035B0)······················································································ 23
DC Circuit Board (H,W,B) (XY032C0) ······································································· 17
DC Circuit Board (J, U, V) (XY031C0)······································································· 16
JK Circuit Board (XY035B0) ······················································································ 24
MAIN Circuit Board (XY036B0)·················································································· 19
MYSL Circuit Board (XY036B0)················································································· 20
PN Circuit Board (XY034A0)······················································································ 18
SW Circuit Board (H,W,B) (XY032C0)······································································· 15
SW Circuit Board (J, U, V) (XY031C0) ······································································ 15
Note: See parts list for details of circuit board component parts.
AC Circuit Board (J, U, C) SW Circuit Board (J, U, C)
AC Circuit Board (H,W,B) SW Circuit Board (H,W,B)
Component side
Component side
Component side
Component side
3NA-V485500
to MYSL-CN052
Power transformer
to MAIN-CN905
2
A'
A
to DA-CN001
to PN-CN963
A'
A
Power transformer
DC Circuit Board (J, U, C)
Component side
DA824
16
3NA-V485540
to MYSL-CN052
Power transformer
to MAIN-CN905
2
B'
B
to DA-CN001
to PN-CN963
B'
B
Power transformer
DA824
17
Component side
DC Circuit Board (H,W,B)
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