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Adjustment Table - Philips 70DCC600 Service Manual

Digital compact cassette recorder
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STAR~UPPROCEDURE
ADJUSTMENT TABLE
Resets ADAS, SBF left, SBF right
DDSP ---> "PLAY MODE"
DAI ---> "TRANS.MODE"
SBC ---> "DECODE MODE"
DEQ2 ---> "LOAD COEFF."
DEQ2 ---> "TEST MODE"
+5A,+~P
* Adjustments can not be carried out in repair shops.
Read also adjustment remarks on page 29
REMARKS
0
C
IAI
~
TAPE SPEED
Use test cassette
"SBC420"
0 <9
Adjust to
3150Hz
3264
f
=
3130 .. 3140Hz
(482239730071)
main board
TAKE UP TORQUE
Use tourque
measurem. casso
Adjust to
"811CTM"
3220
40.. 50g-cm
(482239530054)
main board
WOW AND FLUTTER
Use test cassette
"SBC420"
0 <9
check only
<O,15%w1d.
3150Hz
(4822 397 30071 )
main board
ANALOG FEEDBACK LEVEL AND BIAS
Set feedback pots
00
Adjust both channels
3729(left) and
0
3739 (left)
to"min. THD
Use test cassette
3730(right) to
3740 (right)
(target <2%)
"SBC420"
max. output level first
read/write board
1kHz-10dB
00
(482239730071 )
3729 (left)
Decrease measured
0
3730 (right)
output level by 10dB
read/write board
DOLBY LEVEL
Use
00
Adjust both channels
Dolby reference
Dolby ref. level
0
3325 (left)
to 620mV ±40mV
200nWb/m
3326 (right)
Check: level meter
cassette
main board
shows -6dB
RDMUX-LEVEL
*
Use
0
~
9,6kHz calibration
check only
1,2Vpp ±1 OOmV
cassette
read/write board
RECORDING CURRENT
*
~ ~
read/write board
PLL-FREQUENCY
Disconnect cable
from digital-in plug,
~ ~
Use counter,
switch to
3550
adjust to 7,25MHz
RECORD PAUSE
+O,15/-0MHz
(digital source)
digital board
- Prerec. DCC: Atime, Rtime, TOC, TNo, TEXT
- Super user tape: Atime, Rtime", TNo"
- User tape: Rtime", TNo·
.. only if possible
Front-~P
sends position of hole switches, ...
If head support switch is in "open" position
main-~P
sends 22ms solenoid pulses
Command transferred
via LT-interlace
main-~P H
DDSP
Chip initialization
Mode settings resp. filter coefficients
transferred via LT-interlace
300ms pulse
Resets ADAS, DAI, DDSP
If tray-switch
=
"open"
tray will be closed
+5V,+12V, +10, -12V, -5V (main board)
+5RW, +5VA, +5VB, +7V (RIW board)
STOP
DISPLAY DATA
front-~P
TRANSFER OF DATA
main-~P
--->
front-~P
main-~P
sets
DCC RESET ---> "H"
reset of
front-~P
HRESET ---> "L"
main-~P
sets
I/O-ports ---> "H"
mute ---> "L"
SBC sets
FRESET ---> "H"
DDSP resets SBC
SETPIN2 ---> "H"
(RESET SBC ---> "H")
STBY ---> "L"
muting of FIXOUT, DAI
and HEADPHONE
power on
front-~P
resets
main-~P
SRESET ---> "H"
read TRAY-SWITCH
read HOLE-SWITCHES
RED to STOP POSITION
CS
45 926
27
28

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70dcc600/00870dcc600/05870dcc600/068