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25

aa: Initialization is completed or not.

FF

: Complete.

other number : Not complete.
bb: Operating status of mechanism deck at an error occurred.

  (lod sq jcp)

00

: Initializing.

10 to 15

: Open operating.

16 to 19

: Kicking cause open failed.

1A to 1F

: Open operating.

20 to 27

: Complete the open operation.

28

: No disc and complete the open operation.

29 to 2F

: Complete the open operation.

30 to 3F

: Close requesting.

40 to 4F

: Open requesting.

50 to 5F

: Close operating.

60 to 6F

: Complete the chucking operation.

80 to 8F

: Complete the release operation.

(BU is home position)

90 to 9F

: BU down operating.

A0 to AF

: Opening/closing the shutter. Or stationary state

in open/close the shutter is enablement.

B0 to BF

: BU up requesting.

C0 to CF

: BU down requesting.

D0 to DF

: BU upping.

E0 to EF

: No disc checking in disc loading.

cc : Operating status of table at an error occurred.

  (tbl sq jcp)
  13 : The rotation stop position determination error of a table
  11 to 12 : The loading position determination error of a table

dd: Operating status of mechanism deck at an error occurred.

  (lod OP jcp)

00

: Complete the operation.

10 to 1F

: Open operating.

20 to 2F

: Close operating.

30 to 3F

: Release operating.

60 to 6F

: Chucking operating.

70 to 7F

: Kicking operating.

80 to 8F

: Returning the BU to home position. (after kicking)

ee : The status of  table operation. (“n” is unfixed)

   (tbl op jcp)
  1n : Rotating in the direction of a forward.
  2n : Rotating in the direction of a reverse.

On the Test Mode Menu screen, selecting [6]  displays the ROM
version and region code.
The parenthesized hexadecimal number in version field is checksum
value of ROM.

## Version Information ##

 IF con.

Ver.x. xx

 SYScon.

Ver.x. xx  (xxxx)

Model

DHC-NXMXX

Region

0x

Config

xxxxxxxx

   xxxxxxxx

 Front End Ver.x.xx

Exit: RETURN

IF con.

: The version of system controller (IC501).

SYScon.

: The version of DVD system processor (IC207).

Front End

: The version of mechanism controller (IC901).

On the Test Mode Menu screen, selecting [7] displays color bars for
video level adjustment. During display of color bars, OSD disappears
but the menu screen will be restored if pressing the [RETURN] key.

26

1. Clean the following parts with a denatured alcohol-moistened

swab:
record/playback heads pinch rollers
erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head

demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to

the parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

3.06 N • m to 6.96 N • m

FWD

CQ-102C

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

FWD

0.19 N • m to 0.58 N • m

back tension

CQ-102C

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

 3.06 N • m to 6.96 N • m

REV

CQ-102RC

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

REV

CQ-102RC

2 to 6 g • cm

back tension

(0.02 – 0.08 oz • inch)

6.96 N • m to 14.02 N • m

FF/REW

CQ-201B

71 to 143 g • cm

(0.98 – 1.99 oz • inch)

9.80 N • m

FWD tension

CQ-403A

100 g or more

(3.53 oz or more)

9.80 N • m

REV tension

CQ-403R

100 g or more

(3.53 oz or more)

Mode

Torque meter

Meter reading

0 dB=0.775 V

1. Demagnetize the record/playback head with a head

demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjust.

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in

this service manual.  (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)

6. The adjustments should be performed for both L-CH and R-

CH.

7. Switches and controls should be set as follows unless otherwise

specified.

• Test Tape

Note:  Perform this adjustments for both decks

1. Mode:  Playback

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

set

MAIN board
CN304
Pin 

1

 (L-CH)

Pin 

3

 (R-CH)

MAIN board
CN304
Pin 

2

 (GND)

+
–

level meter

test tape
P-4-A100
(10 kHz, –10 dB)

27

2. Turn the adjustment screw and check output peaks. If the peaks

do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

3. Mode:  Playback

4. After the adjustments, apply suitable locking compound to

the parts adjusted.

Adjustment Location:  Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

MAIN
board
CN301
set

test tape
P-4-A100
(10 kHz, –10 dB)

pin 

3

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

pin 

2

pin 

1

L

R

forward

reverse

1. DBM07 board is basically designed to operate without adjust-

ment. Therefore, check each item in order given.

2. Use DVD reference disc unless othermise indicated.

[DVD reference disc]
• LUV-P01 (4-999-032-01) (CD)
•TDV-540C (J-2501-235-A) (DVD-DL)
• TDV-520CSO (J-2501-236-A) (DVD-SL)

3. Use an oscilloscope with more than 10M

Ω impedance.

4. Clean the object lens by an applicator with neutral detergent

when the signal level is low than specified value with the
following checks.

Video Level Check (DBM07 BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.

1. Connect oscilloscope to VIDEO output.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00

±0.05Vp-p.

J1102
VIDEO OUTPUT

75 

Ω

Oscilloscope

set

1.00 

±

 0.05 Vp-p

(WHITE 100%)

28

RFMON Level Check
Perform a RFMON level check before exchanging optical pick-up.
Connection:

       RFMON signal waveform

• Standard value

DVD

TDV-520CSO

1.09

±0.2Vp-p

(J-2501-236-A)

CD

LUV-P01

1.05

±0.2Vp-p

(4-999-032-01)

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

RFMON level

R

R

C042

R013

R

C034

C036

C035

C033

C012

R031

C051

IC001

32

33

16

17

+
–

JL005(RFMON)

oscilloscope

–RF board (side B) –

JL005

(RFMON)

VC