Fostex VM04, Service Manual

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VM04 VM04
19 6
MAIN PCB : ANALOG IN
2 3 1 4
J2 Y
K
B
21-
5074
R
101 18K
R
102
22K
C
101
10/
16
R
103
100
K
3 2
8 4
1
U
101
A
N
JM
2115
M
R
104
1M
C
103 100
P
C
106
0.
01
A+
5
AG
ND
AG
ND
R
106
130
R
107
100
K
3
2
1
R
110
20K
C
AG
ND
AG
ND
C
102
NO
N
5 6
7
U
101
B
N
JM
2115
M
R
108
10K
R
109
10K
C
105
NO
N
VB
IA
S1
AI
N
1+
AI
N
1-
2 3 1 4
J3 Y
K
B
21-
5074
R
201 18K
R
202
22K
C
201
10/
16
R
203
100
K
3 2
8 4
1
U
201
A
N
JM
2115
M
R
204
1M
C
203 100
P
C
206
0.
01
A+
5
AG
ND
AG
ND
R
206
130
R
207
100
K
3
2
1
R
210
20K
C
AG
ND
AG
ND
C
202
NO
N
5 6
7
U
201
B
N
JM
2115
M
R
208
10K
R
209
10K
C
205
NO
N
VB
IA
S2
AI
N
2+
AI
N
2-
2 3 1 4
J4 Y
K
B
21-
5074
R
301 27K
R
302
47K
C
301
10/
16
R
303
100
K
3 2
8 4
1
U
301
A
N
JM
2115
M
R
304
0
C
303 NO
N C
306
0.
01
A+
5
AG
ND
AG
ND
R
305
NO
N
AG
ND
AG
ND
C
302
NO
N
5 6
7
U
301
B
N
JM
2115
M
R
306
10K
R
307
10K
C
305
NO
N
AG
ND
VB
IA
S3
AI
N
3+
AI
N
3-
2 3 1 4
J5 Y
K
B
21-
5074
R
401 27K
R
402
47K
C
401
10/
16
R
403
100
K
3 2
8 4
1
U
401
A
N
JM
2115
M
R
404
0
C
403 NO
N C
406
0.
01
A+
5
AG
ND
AG
ND
R
405
NO
N
AG
ND
AG
ND
C
402
NO
N
5 6
7
U
401
B
N
JM
2115
M
R
406
10K
R
407
10K
C
405
NO
N
AG
ND
VB
IA
S3
AI
N
4+
AI
N
4-
L101 BE
A
D
L201 BE
A
D
L401 BE
A
D
L301 BE
A
D
IN
PU
T
1
IN
PU
T
2
IN
PU
T
3
IN
PU
T
4
(-
10d
B
V
to
-
50d
B
V
)
(-
10d
B
V
to
-
50d
B
V
)
(-
10d
B
V
)
(-
10d
B
V
)
C
107
220
/1
0
C
207
220
/1
0
C
407
10/
16
C
307
10/
16
R
308
1K R
408
1K
3-1 Software Version Check
While holding down the EXIT key and ENTER key together, press the EFFECT TYPE key.
The LCD Display will show the Software Version of the VM04 for a second, and then return to
the Normal Mix mode.
MASTER CH
MASTER CH
MASTER CH
3-4 Fader Check
While holding down the EXIT key and ENTER key together, press the FADER ADJUST key.
3-3 Display Check
While holding down the EXIT key and ENTER key together, press the VIEW key.
· All the LEDs and LCD segments are supposed to start blinking. Check if they are correctly
blinking or not.
· Press the ENTER key would change the blinking pattern.
· If the key other than the ENTER key is pressed, the VM04 returns to Normal Mix mode display.
3-2 Battery Check
While holding down the EXIT key and ENTER key together, press the EFFECT PARAMETER key.
· The LCD Display will show the voltage of the memory backup battery inside the VM04 for
a second, and then return to the Normal Mix mode.
· If the voltage falls below 2.2V, the message “BattEmpty” will appear when powering ON.
· If the message “BattEmpty” is displayed, please replace the battery with the new one. For
exchanging procedure, please refer to the page 7.
MASTER
SCENE NO.
MAX
CH
2ch 1ch 4ch DATA encoder 3ch
R
3. SERVICE MODE
MASTER CH
3-5 Test Scene RECALL
While holding down the EXIT key and ENTER key together, press the SCENE RECALL key
· There are five Test Scenes (Test 1 ~ Test 5).
· Pressing the ENTER key would step forward the Test Scene.
· Pressing the key other than the ENTER key would return the VM04 to the Normal Mix mode display.
· Each Test Scene is set up as shown in the table below.
Eff Send
Level PAN Level PAN Level PAN Level PAN 1~4 ch
TEST 1 80 L 80 R 80 L 80 R 80 00 POST -
TEST 2 80 L 80 R 00 C 00 C 80 00 POST -
TEST 3 00 C 00 C 80 L 80 R 80 00 POST -
TEST 4 80 L 80 L 80 L 80 L 80 00 POST -
TEST 5 00 C 00 C 00 C 00 C 80 80 PRE Delay
Effect Master Pre/Post
CH 1 CH 2 CH 3 CH 4
Blink
TEST 1 Line Check 1~4 Output Level / Frequency Response
TEST2 Line Check 1, 2 Output Level(Trim) / Frequency Response / Distortion / S/N(INPUT : Short)
TEST 3 Line Check 3, 4 Output Level / Frequency Response / Distortion / S/N(INPUT : Short)
TEST 4 Line Check 1~4 S/N(
∑
4, INPUT : Short)
TEST 5 Effect Check 1~4 Only the effect signal (1 Time Delay) is output.
· Confirm that each channel parameter value correctly appears on the
Character Display.
· Confirm that the SCENE NO. Display value would vary when rotat-
ing the DATA encoder.
· If any key is pressed, the VM04 returns to Normal Mix mode display.
CAUTION: While in the condition that the Test Scene is recalled, please do not turn off the power. Otherwise, correct Scene No. cannot be recalled.