Kenwood DMC-J3 Service Manual page 9

3. TEST MODE
* Test mode I is required when disassemble or replace the
laser pickup and MD mechanism.
* Test mode I and II are required when replace the
E2PROM.
* Need the remote control for adjustment procedure.
How to Reset the Unit.
* Connect the AC adapter to the wall outlet with pressing
<SKIP> key.
* Contents of initialization.
Volume VOL 10
Repeat OFF
Bass boost BOOST 1
Remocon mode DISC/TRACK(title mode)
Resume TNO TNO[1]
Auto power save ON
Beep ON
Display in Remocon [ENG]
Display in unit All segments on.
Display shows for 2seconds.
3-1 TEST MODE I (Adjusting Mode)
* Contents(to memorize the adjustment result to E2PROM)
1) EF Balance(automatic)
2) Focus Bias(manual)
* Result Display Contents
1) Average data of VC offset revision [2'SCOMP]
2) Average data of FE offset revision [2'SCOMP]
3) Average data of ABCD offset revision [OFFSET
BINARY]
4) FOCUS bias adjustment [2'S COMP]
5) FE balance adjustment value(high/low reflection
pit/low reflection groove)
6) Tracking auto gain filter coefficient(high/low reflection)
7) Focus auto gain filter coefficient(high/low reflection)
3-1-1 Setting
1) Connect the #42(TEST1) and 43(TEST0) ports of IC5
to 2.8V(VDD) port. Next to AC adapter.
Mode is STOP.
Remote cont [TEST1]
Unit [o1]
2) Press the SKIP UP key. To memorized the proper
value of FE balance automatically. Manual adjust-
ment if press the SKIP DOWN key.(Description is
automatic only)
3-1-2 Automatic FE Balance Adjustment
1) The FE balance setting value of the default starts a
servo by the value which is memorized in E2PROM.
Incidentally, there are 3 kinds of memory area (high/
9
CIRCUIT DESCRIPTION
3. TEST MODE
3-1-3 Focus Bias Check
DMC-J3
Low reflection Pit/Low reflection groove)which store a
balance setting value E2PROM. At the time of auto-
matic adjustment this 3 kinds of areas are used
appropriately according to a disc.
* There is a setting range of 32 steps(00h-1Fh) in the
balance setting value. The default value are
High reflection 11h
Low reflection 10h (pit)
Low reflection 10h (groove)
2) Display shows the following if automatic adjustment
proceeds.
Remote cont [AP ADJ] – – Auto Pit ADJustment
[AG ADJ] – – – – Auto Groove
Unit [o1]
3) Adjustment is over if loading the pre recorded disc. In
case of the recordable disc, the servo will be "03"
mode. Read the TOC in lead area and read the head-
er and access lead -in area in CPLAY mode
Remote cont [AP ACS] – – – Auto Pit ACceSs
Unit [o1]
4) Proceed pit area adjustment after TOC read if loading
the recordable disc. Change to focus bias check after
TOC read if loading the pre recorded disc.
Remote cont [AP ADJ] – – – Auto Pit ADJust-
Unit [o1]
5) Change to FOCUS Bias step after pit area adjustment
if loading the recordable disc.
Remote cont [AG ACS] – – – Auto groove
Unit [o1]
1) The unit is in CPLAY mode after FE balance adjust-
ment procedure. Focus bias default will be the value
from E2PROM. There are 2 kinds of values.
High/Low reflection is F2h. Choose C1 error rate or
ADIP error by SHIT key.
Remote cont [72 52]
[AER 00] numeric: ADIP error
Unit [o1]
ADJustment
ment
ACceSs
left 2 figures: bias set-
ting value +80h
right 4 figures: C1 error
rate