Kenwood DMC-K3, Service Manual

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DMC-K3
CIRCUIT DESCRIPTION
7
1-3 Voltage matrix key (u-COM pin
| |
,
“ “
)
2. 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)
Auto Play OFF
Resume TNO TNO[1]
Auto power save ON
Beep ON
Display in Remocon [ENG]
Display in unit [En]
Power off after display shows for 2 seconds
2-1 TEST MODE I(Adjusting Mode)
* Contents(to memorize the adjustment result to E2PROM)
1) EF Balance(automatic/manual)
2) Focus Bias(automatic/manual)
Note:Automatic adjustment only in this manual
2-1-1 Setting
1) Connect the #24(P_TEST1) and 23(P_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.
2-1-2 Automatic FE Balance and FOCUS Bias
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/Low reflection Pit/Low reflection
groove)which store a balance setting value E2PROM.
At the time of automatic adjustment this 3kinds 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
51h
Low reflection 10h (pit)
Low reflection 90h (groove)
2) Display shows the following if automatic adjustment
proceeds.
Remote cont [WAIT O] --- O means in operation
mode.
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 [WAIT O]
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
[WAIT O]
5) Change to FOCUS Bias step after pit area adjustment
if loading the recordable disc.
Remote cont [WAIT O]
Unit
[o1]
2-1-3 Focus Bias Check
1) The Focus bias will be adjusted automatically at the
focus bias 16,0,-16)
Remote cont
[*80 OO] left 2 figures:
bias setting value +80h right 3 figures: C1 error
rate(OVR;4 figures)
2) Display shows setting value+80h. Press the
PLAY/PAUSE key to stop Automatic Adjustment.
Remote cont [*80 10] changed value
[TEST 1] the play/pause
key is pressed
Unit [o1 changed value
[oo] the play/pause
key is pressed
2-2 TEST MODE II (AUDIO SPEC)
* Item of audio specification(use test disc TDYS1)
1) Reference
TNO[ 2]: 1kHz sinewave,0dB,L &R, Emphasis off
0 Port voltage [V]
SET 6KEY PIN 56 KEY0
6 7
6 7
4 ¢
4 ¢
0.4
Key function
Port voltage [V]
Key function
Port voltage [V]
REMOCON 8KEY PIN 57 KEY1
Key function
Port voltage [V]
Key function
Port voltage [V]
Key function Non remocon
0.8 1.2
0 0.21 0.46 0.73 1.02
1.6 2 2.4 2.8
VOL.DOWN VOL.UP KEY OFF
VOL.UP
1 1.6 1.9 2.23
VOL.DOWN MODE HOLD Exist remocon
2.57 2.8