Koden DM - 682/684 User manual

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February 9, 2009
Drilling Monitor
DM – 682/684
DM – 602/604
Instruction manual for repair and inspection
Document No. C25EHZ0100
Koden Electronics Co., Ltd.

1
Measuring instruments to be prepared:
The following instruments shall be prepared for inspection:
(1) Variable voltage transformer: Variable between 80 - 280 V with 150 VA or more
(2) Ammeter: AC: 0 – 10 A, DC: 0 - 2 A
(3) Digital voltmeter: AC: 0 – 280 V, DC: 0 – 300 V
(4) Frequency meter: 10 Hz – 10 MHz
(5) Oscilloscope: DC: 0 – 50 MHz 2 CR. With 10:1 probe
Confirmation of each block:
This drilling monitor can be divided into the following blocks and each block shall be confirmed:
a. Recorder : Power supply unit: Various power circuits
Motor driving circuit
Paper feed motor driving circuit
Overvoltage protection circuit
b. Recorder: Logic
c. Recorder: Transmitter and receiver
d. Interlock with winch:
e. Fixing of data plates and others:

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External views and dimensions
1. Recorder unit (External view)
2. Winch unit (External view)

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Recorder
a. Adjustment of belt driving part
a-1 Loosening the mounting screws of driving motor, adjust the mounting position of the driving
motor. Rotate the driving motor by hand and adjust the tension of the belt to have
approximately ± 0.5 mm deflection.
b. Confirmation of rotation signals of the belt and tension of the belt
Rotation detection part (P.C.B. HOLE 100 Mo) shall be as shown below:
Adjustment method for tension of the belt
Fix the rotation detection PCB to have 0.8 mm ± 0.03 mm gap between the hole IC and the
magnet without up-and down of out-of alignment.
A
xis of driving pulley
⋆± 0.5 mm
Mounting screws of driving
moto
r
A
xis of driving moto
r
Mounting screws
Loosen the screws c.
Turn the bolt dto
adjust tension of the
belt.
Pulley
Loosen screw
Tighten screw
Belt
HOLE_P.C.B.

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3. Accuracy (Horizontal direction)
3-1. Receiving clock
a. Set the scale of “Range calibration control dial” on the control panel at 8.
b. Connect a frequency meter to TP-22 on 7000 PCB (for DM 602/4, TP-23 on C25-7000B PCB)
(Use a probe of 10:1)
c. Turn the slug of L1 (KT-800) to set at 3,000 MHz
(When there are 2 or more setting points, set at the point with more slug dropouts)
d. After completion of setting in above c., turn the “Range calibration control dial” to “0” and “10” to
confirm the following values:
Specification: At position “0” of the dial: 2.550 MHz or less
At position “10” of the dial: 3.150 MHz or more
3-2. Confirmation of recording accuracy
Confirm that the line gap of each marker is 5 mm for full width of recording paper. When there are
many errors, vary the VRI on 6000 PCB to set correctly.
Specification of accuracy: 5 ± 0.1 mm
3-3. Confirmation of recording uniformity
Confirm that there is no fluctuation as shown above.
Specification of accuracy: within ± 0.1 mm
Switching on “Manual mark switch”

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4. Rejection of oscillation lines
Turn on the “Oscillation line rejection switch”.
Confirm that oscillation lines will disappear as shown below (Switch off after confirmation)
5. Operation of zero position setting switch (Set at 009 cm)
a. Vary the TD Width switch on sub-panel.
b. Confirm that the gap of oscillation lines will expand responding to the variance, and set it at 009
cm after confirmation.
6. Operation of test mode
6-1. After the “Mode switch” on sub-panel is turned to “Test” side, confirm that false signals will be
recorded as shown below. After conformation, turn the switch to “MEAS” side.
Oscillation lines
Gap between oscillation lines
False signals
False signals
Setting ranges: ○
A< 0.5 >, ○ B< 1.0 m >, ○ C: < 2.0 m >, ○ D: < 4.0 m >

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6-2. Turn on the “Signal processing switch” on sub-panel, and connect the oscilloscope to the terminal
TP-REC of 6000 PCB. Set the below setting with VR3 1 kΩ.
After confirmation, turn the switch to off side.
Thick
Thin Standard: ± 10 V
120 V (variable range)

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7. Operations of RANGE and SHIFT, and status of write-in of recoded letters
7-1. Confirm that numerical figures and characters will be displayed at every switching-over of “RANGE”
and “SHIFT” switches.
Displaying locations:
DM-682/602: Recorded at the right side
DM-684/604: Recorded at the center
Example: R = 2 M, S = 0 %, X
Range switch Shift switch 682 Direction switch
Confirm that letters are not distorted. In the case of 682/602, confirm also with “Direction” switches
for X and Y.
Example of location and recording of “Shift” switch:
Record A: < 0 % >, Record B: < 50 % >, Record C: < 100 % >
The relations between positions and ranges of records for “Range” switch and “Shift” switch are as
follows:
Shift
Range
0 % 50 % 100 %
0.5 m Radius to 0.5 m Radius 0.25 ~ 0.75 m Radius 0.5 ~1.0 m
1.0 m Radius to 1.0 m Radius 0.5 ~ 1.5 m Radius 1.0 ~ 2.0 m
2.0 m Radius to 2.0 m Radius 1.0 ~ 3.0 m Radius 2.0 ~ 4.0 m
4.0 m Radius to 4.0 m Radius 2.0 ~ 6.0 m Radius 4.0 ~ 8.0 m
The set up range and shift values will be recorded at the right side.
Record A
Record B
Record C
3rd echo Center of record 3rd echo
Record on walls Oscillation lines Record on walls
The part of “a”.is missing from “Record A”.
The
p
art of “b” is missin
g
from Record B.
2nd echo
2nd echo

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8. Paper feed
8-1. Paper feed speed operation “Const”
Turn on the “Paper speed” switch to Const 60, 30, 15 and 7.5 mm/min, and confirm the feed width of
paper per one minute.
Specification: At 60 mm/min: ±2 mm
At 30 mm/min: ±1 mm
At 15 mm/min: ±0.5 mm
At 7.5 mm/min: ±0.25 mm
8-2. Confirmation of paper feed movement proportional to depth (When sensor stops, paper feed will also
stop.)
a. Lift and lower the sensor at a slow speed.
b. Setting the UP/STOP/DOWN switch at 1/40, operate for more than 1 minute.
The gap for 1 m mark shall be 25 mm.
c. Setting the UP/STOP/DOWN switch at 1/50, 1/100 and 1/200, confirm as above.
At 1/50, the gap of 1 m mark: to be 20 mm
At 1/100, the gap of 1 m mark: to be 10 mm
At 1/200, the gap of 1 m mark: to be 5 mm
The “SPEED control” switch shall be set at the position
shown at left.

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9. Operation of hole wall diameter marks
a. By turning the “Width marker” switch on right panel, it shall be confirmed that the records of
dotted lines will change.
b. The gap between hole wall diameter marks shall be confirmed to be matched with the set value
(see above figure). The set values are as follows:
Range Shift Set value of hole
wall diameter mark
Variance of hole
wall diameter mark
0.5 m 0 % 1 – 9 cm 1 cm gap
1 m 0 or 50 % 1 – 2 m 10 cm gap
4 m 0 or 50 % 1 – 9 m 1 m gap
c. It shall be confirmed that the dotted lines will be shifted to right or left depending on the operation
of L – R Shift switch (see above figure).
d. Connect the encoder for recording to pin Nos. 7 and 14 of the Winch connector as follows:
e. At switch ○
1of 7000 PCB, Nos. 1 and 8 shall be ON, and at switch ○ 2, Nos. 1 and 8 shall be
also ON.
For DM 602/4, S3, S4 and S5 of C25-700B PCB will be 3E8.
Encoder Winch
Set value is 99.
Hole wall diameter mark
Set value

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f. Confirmation on records: By rotating the encoder.
yMark at every 1 m:
yMark at every 5 m:
yDouble mark at every 10 m. This is double thick record per each 5m.
yDepth value records:
To confirm 0, 5, 10, 15, ………., up to 30m
yRecord the following marks by Winch up/down switch operation:
: Stop mark
: Up mark
: Down mark (This mark will not appear on DM 602/4.)
10. Depth (LED) display operation
a. This confirmation shall be performed under the connection in above 9.
b. Make sure that the “Depth mark” switch on control panel shall not be “OFF”.
c. When the sensor was lifted up and lowered down to measure 1 m movement, it shall be
confirmed that dotted lines will be recorded on recording paper and 1 m will be displayed on the
LED indicator.
d. When it moved 5 m, a solid line shall be recorded on recording paper, and when it moved 10 m,
two solid lines shall be recorded.
e. When the “Depth mark” switch is turned OFF, all indications on the LED indicator shall show “0”
and no depth marks shall be recorded on recording paper.
11. Confirmation of meter indication at power supply and operation of leakage current breaker.
a. The output of the variable voltage transformer shall be varied between 80 – 120 V, and it shall
be confirmed that the output voltage shall be matched to the indications of the meter within the
range with green mark of 80 – 120 V. Compensation shall be performed with the adjustment
screw.
b. The meter shall be activated regardless “ON” or “OFF” of the power supply switch.
c. When the leakage current breaker is “OFF”, it shall be confirmed that the meter will be “OFF”.
Adjustment screws

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12. Confirmation of gain in air
a. The sensor shall be held at the position as shown in the figure below.
b. Set the switches and knobs on the control panel as follows:
DM-682
Shift switch on DM 602/4 is mounted inside the control panel.
c. It shall be confirmed that the frame of the winch will be recorded on recording paper.
In the case of DM-682:
1) When “Direction” switch is turned to the < X – X’ > side, it is normal when the 1st echo is
recorded.
Stopping position
Frame
Sensor elementSensor
Range switch………………..< 4 m >
Calibration dial………………< 8 >
Shift switch ………………….< 0 % >
Gain knob (small) ……Clockwise: Full
STC knob (large)…Counterclockwise: Full
Paper speed switch…..< 30 mm/min > of <CONST >
Direction switch……..< X – X’ > or < Y – Y’ >
Only for DM-682
1s
t
st echo

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2) When “Direction” switch is turned to the < Y – Y’ > side, it is normal when the 2nd echo is
recorded.
In the case of DM-684:
It shall be confirmed that the 1st echo is recorded in the direction of < X – X’ > and the 2nd echo in
the direction of < Y – Y’ >.
When there is no record, place two aluminum plates at about 25 cm distance from both side of the sensor
element facing each other as shown below, and confirm that the 2nd echo will be recorded in the
direction of X – X’.
Confirmation of gain in the direction of < X – X’ >
2ndnd echo
1st echo 2nd echo
Sensor
Aluminum plate Aluminum plate

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13. Confirmation of “Gain control” knobs and STC knobs operation
13-1. Confirmation of “Gain control” knobs
This will be performed by “Gain control” knobs. Turning of these knobs clockwise will increase the
gain of receiver and turning counterclockwise will decrease the gain. By adjusting 4 knobs for X, X’,
Y and Y’, images of wall surface shall be recorded respectively.
Example 1: Excessive gain disenables separation of oscillation lines and wall surface images, and
they will be recoded running on.
DM-682/602:
DM-684/604:

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13-2 Confirmation of STC knobs
This will be performed by STC knobs. Turning of these knobs clockwise will reduce the gain near
oscillation lines resulting in elimination of diffused reflection from oscillation lines to wall surface. By
adjusting 4 knobs of X, X’, Y and Y’, wall surface images shall be recorded respectively. When
discrimination of oscillation lines and wall surface images is not possible, turn the STC knobs
counterclockwise to separate the records of oscillation lines and images.
Example 2: Variation of records when STC is adjusted.
DM-682/602:
DM-684/604:

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14. Operation of phasing devices for winch (for cable drum, wire drum)
a. By lifting and lowering the sensor, the cable and the wire shall be wound on the drums
respectively without overlapping, making neat layers.
(Confirm at high-speed and low-speed).
b. Each chain shall have 10 ~ 15 mm slack.
c. Adjustment procedure is shown below:
As for wire side, confirm the both right and left sides.
zWhen the hold down roller is lifted up, wire between A and B shall become straight.
zPhasing device for wire can be relocated to right and left independently.
When reached to sea bottom, tension
of cable shall be adjusted to make this
angle to be about 30 degrees.
30 degree
Cable drum
Roller
From cable drum to roller, the cable
shall be in straight.
Wire
drum
Hold-down
roller
Keep these in parallel
Adjustment

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15. Confirmation of mounting direction of transducer
a. Plates to show X, X’, Y and Y’ directions shall be confirmed
to have been affixed correctly.
b. It shall be confirmed that when a metal plate such as a tab
of a can is attached to one of the transducer surface, the
corresponding image will be changed.
c. This shall be applied to 4 transducers.
16. Operation of limit switches for reaching sea bottom and upper limits
When the sensor is raised up and down, the driving motor shall stop with signals from limit switches.
17. Adjustment of sensor’s lifting speed and lowering speed
a. The winch shall be mounted on a water bath where the sensor could be lifted and descend by 2
m or more.
b. After the “Sensor speed control” knob has been turned fully counterclockwise, the “Sensor
movement control” switch for UP/STOP/DOWN shall be switched over. When the sensor starts
moving, the lifting speed shall be increased.
c. The moving speed shall be set at “STOP” at full counterclockwise position of the “Sensor speed
control” knob and to be “lowering speed of 20 m/min” at full clockwise position. Dead slow
speed at scale “2” shall be also confirmed.
After connecting the frequency meter (with a probe of 10:1) to TP-17 of 7000 PCB, set the
maximum voltage of motor controller to be 33 Hz max at full clockwise position of the lifting and
lowering speed control knob during lowering of the sensor. Neglect the fractional part.
d. Speed adjustment shall be performed by “Motor controller (SP-3) or (DMC-001)” at the rear
panel of recorder unit.
yFor DM-602/604, a frequency meter shall be connected to terminal TP-16 of C25-700B PCB.
Y’
Y
X
X’
Bird-eye view of winch
Minimum voltage adjustmen
t
(Low speed fine adjustment)
Maximum voltage adjustment
(high speed fine adjustment)
When adjustment of high speed cannot be done, the fixed resistance of 1
kΩin the controller should be replaced with a resistance of a few kΩ.
This portion shall be kept contacted. The switch shall
be set to be turned off, when this portion is raised by
2 ~ 3 mm. (Sensor will stop descent)
There shall have 2 ~ 3 mm allowance
at the beginning of contact between
the hanger and the switch.
Motor of winch
Do not bend
Bottom
Upper
limit
Cross bar
30 degree
Hanger

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