Philips DCC170/00 - Tape Speed and Playback Sensitivity Adjustments

(1)
Tape
Speed
Adjustment
Caution
This
adjustment
can
be
made
only
in
the
(4)
Motor
Speed Adjustment
mode
under
Factory
mode.
1.
Set the mode
to the
"Motor
Speed
Adjustment
Mode"
under Factory
Mode.
(Refer
to
page
20.)
2. Play
back the ACC Test
Tape
(SBC420:
3150H2,
-10d8)
forward.
3. Adjust
RU51
until the frequency
counter
reads
3150H2.
Adiustment
Ta
:
3150 t1
SHz
Preparation
Setup
Test
tape
and
tool required
Measuri
ng instruments
required
1 ACC
test
tape
(SBC420)
Ceramic
screwdriver
(HOZAN
D-281
,@)No.
1.7)
2
1.
Frequency
counter
Frequency
counter
Connect
either
L-ch
or
R-ch.
4.
Reverse
the direction
of tape
transport
and
perform
the
same
check.
Gheck
Target:
3150
t30Hz
Note:
Four
digit
number
(hexa
value)
displayed on the
LCD
is
a
voltage
value
of
RU51 A/D-converted
by the
microcomputer.
(2)
Playback
Sensitivity
Gheck
Preparation
Setup
Test
tape and
tool required
Measuring instruments
required
1.
ACC
test
tape
(SBC420)
1.
Oscilloscope
2.
Electronic voltmeter
(EVM)
(AC
range)
Lch:
OUT
(LINE
OUT)
Rch:
OUT
(LINE
OUT)
DCCl70
Check Procedure
1.
Play
back the ACC Test Tape
(SBC420:315H2,0d8)
fonrvard.
2.
Check that
the
line
output levels
on both channels
fall within
the
Íollowing
limits:
Check Taroet:
450mV
tldB
3.
Reverse
the direction
of tape transport
and
perÍorm
the
same check.
o lf it is
still outside the limits
after
realignment,
do the
Playback
Sensitivity
Adjustment
described
in item
(3).
(3)
Playback
Sensitivity Adjustment
Preparation
Setup
Test
tape
and tool required
Measuring
instruments
required
1. ACC
test tape
(SBC420)
2.
Ceramic
screwdriver
(HOZAN
D-281
,@No.
1.7)
1.
Oscilloscope
2. Electronic voltmeter
(EVM)
(AC
range)
Lch:
TPl
EVM
Rch:
Tp2
(AC
range)
Osciiloscope
Adjustment
Procedure
1.
Play
back
the
ACC Test Tape
(SBC420:
315H2, OdB)
forward.
2.
Adjust R127
(L
ch)
and
R128
(R
ch) untilthe
test
land TP1
(Lch)
and
TP2
(R
ch)
levels
on both channels
Íallwithin
the
following
limits:
Adiustment
Tarqet: 113mV
tl
dB
3.
Reverse
the
direction
of
'tape
transport and
perform
the
same check.
-17
-
PCS
79 279