VM88 VM88
42 3
PLL, DIGITAL, MAIN, VM88
U925 TC9246F
L7
22uH
C27
220/ 10
C13
0.0 1
C1 4
0.0 1
PGND
D+5
PGND
R978
100
C34
0.4 7
C1 5
0.0 1
R970 1K
R968 22K
R976 4.7K
C3 5
15P
C1 6
0.0 1
R974
330
R975
750
1
2
3
U917A
74VHC86
4
5
6
U917B
74VHC86
D+5
R979
100
3 14
4 13
5 12
6 11
157
10
2
9
1
U919A
74VHC161
D+5
1
2
3
U920A
74VHC00
4
5
6
U920B 74VHC00
9
10
8
U920C
74VHC00
S
4
D
2
CK
3
R
1
Q
5
Q
6
U923A
74VHC74
S
10
D
12
CK
11
R
13
Q
9
Q
8
U923B
74VHC74
S
10
D
12
CK
11
R
13
Q
9
Q
8
U924B
74VHC74
S
4
D
2
CK
3
R
1
Q
5
Q
6
U924A
74VHC74
S
4
D
2
CK
3
R
1
Q
5
Q
6
U922A
74VHC74
S
10
D
12
CK
11
R
13
Q
9
Q
8
U922B
74VHC74
C3 1
100P
D+5
DGND
DGND
D+5
D+5
2 3
1
U928
DTA114 EK
2
1
3
U929
DTC114 EK
R984
10K
R985
10K
D+5
DGNDD+5
D+5
R980
100
D+5
R981
2.2K
C3 2
100P
DGND
R982
100
14
7
D+5
DGND
14
7
14
7
14
7
14
7
16
8
C1 7
0.0 1
C18
0.0 1
C19
0.0 1
C20
0.0 1
C21
0.0 1
C22
0.0 1
S
4
D
2
CK
3
R
1
Q
5
Q
6
U921A
74VHC74
D+5
D+5
C3 3
100P
DGND
DGND
14
7
C23
0.0 1
LOCK2
R971
1K
R983
10k
D908
1SS355
R973
100
R972
100
12
13
11
U920D
74VHC00
D+5
S
10
D
12
CK
11
R
13
Q
9
Q
8
U921B
74HC74
L3
EMI
D+5
D+5
L4
EMI
X902
C28
22P
C29
22P
DGND DGND
R986 1
M
3 4
U927B
1 2
U927A
L5
L6
DGND
16
8
R969 NON
C24
0.0 1
C25
0.0 1
14
7
56 98 1110 1312
L98
820uH
C36
0.1
DGND
D+5
DGND
MCK
MCK
[DIF]
FS512
FS512
MCK
LRCK
LRCK
DATA_IN
DATA_IN
U927C
74HC04
U927D
74HC04
U927E
74HC04
U927F
74HC04
FCONT2
/PLL1_CONT
/PLL2_CONT
PD1
PD2
FCONT1
FCONT2
/PLL1_CONT
/PLL2_CONT
PD1
PD2
FCONT1
REF
PD
VDDA
AMPI
AMPO
VSSA
XI
XO
VDD
LOCK
S2
S1
M2
M1
CKO
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
22.5792MHz
74VHCU04
74VHCU04
EMI
EXT//INT
EXT//INT
1A
1B
2A
2B
3A
3B
4A
4B
A/B
G
1Y
2Y
3Y
4Y
2
3
5
6
11
10
14
13
1
15
4
7
9
12
U926A
74VHC157
EMI
U917E
VCC
GND
74VHC86
U919B
VCC
GND
74VHC161
U920E
VCC
GND
74VHC00
U921C
VCC
GND
74VHC74
U922C
VCC
GND
74VHC74
U923C
VCC
GND
74VHC74
U924C
VCC
GND
74VHC74
U926B
VCC
GND
74VHC157
U927G
VCC
GND
74VHCU04
2. MAIN_D, CPU
1. MAIN_D, ROOT
3. MAIN_D, DSP_ROOT
7. MAIN_D, GA_DIF
4. MAIN_D, DSP1 2
5. MAIN_D, DSP3
6. MAIN_D, DSP SEL
8. MAIN_D, PLL
SPDIF//ADAT
LOCK2
SPDIF//ADAT
A
B
C
D
ENP
ENT
CK
LOAD
CLR
QA
QB
QC
QD
RCO
Parts marked with this sign are safety critical components. They must always be replaced with identical
components. Refer to the Fostex Parts List and ensure exact replacement.
CAUTION
TABLE OF CONTENTS
Owner's manual : 8288458000 (for export & domestic model)
Service mode, exploded view, PCB assembly, parts list and circuit diagrams are given in this manual
to assist the service technician in maintaining the Model VM88.
NOTES
The following accessories are supplied with VM88 as the standard accessories.
*
*
Following is the packing material for the Model VM88.
*
Carton, inner, VM88 : 8228737000
Packing, side, L, VM88 : 8228465001
Packing, side, R, VM88 : 8228465002
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .
3. SERVICE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .
5. CIRCUIT AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . .
4
6
7
10
23
!
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