Sony D-5 - Section 3: Adjustments; 3-1. Electrical Adjustments

- ~p-5/D-50
SECTION 3
ADJUSTMENTS
3-1. ELECTRICAL ADJUSTMENTS
Notes on Adjustment
1. Perform adjustments in service mode,
Be sure to release service mode after completing
adjustment.
(Refer to “Service Mode (service program)” on
page 9-11.)
2. Perform adjustments in the order given.
3. Use YEDS-1, but only when disc use is indi-
cated.
4. Powersupply voltage: DC 9 V
Power switch: ON
PREPARATION
Put the set into service mode (see page 9-11) and
perform the following checks. Repair if there are any
abnormalities,
@ Sled Motor Check
1. Press the OPEN button and open the top panel.
2. Press the Ppl, Keg keys and make sure that the
FOP moves smoothly, without catching, from
the inmost > outmost > inmost circumfer-
ence.
bP: FOP moves outward
\44 : FOP moves inward
@ Focus Search Check
1. Press the OPEN button and open the top panel.
2. Press the>@#M#key. (Focus search is performed
continuously, Laser does not emit.)
3. Observe the FOP objective lens and check that
it moves smoothly up and down with no catch-
ing or noises.
4. Pressthe HM key.
Check that focus search operation stops, If it
does not, press the Mf key again, longer.
Note:
For sets using MB88541-120M for microcom-
puter IC801, the objective lens may stay up
and the disc table rotate at high speed when
the » Bikey is pressed.
(Sets using MB88541-120M for IC801 will only
perform focus search once the second time
after the focus on state has been obtained.)
If this happens,
1) Press M key.
2) Unplug external power supply and press
> Ebkey.
3) Plug in external power supply.
4) Press® @key, without disc inserted. With
this, focus search will be repeated over and
over.
TRIANGULAR WAVE ADJUSTMENT
Conditions:
Set the ground levels of dual-trace oscilloscope CH1
and CH2 so that they are the same.
Adjustment Method:
checking triangular wave Adjustment
dual-trace oscilloscope
(DC range)
dual-trace oscilloscope
(DC range}
main board main board
—_—_
TP14Q90———_—~0+
=
TP57
P ea or
FPS | TP58
(TP59)
1. Connect the dual-trace oscilloscope to main
board test points TP14 and TP15.
2. Put the set into service mode (refer to pages
9-11).
3. Observe the oscilloscope waveform and remem-
ber if offset voltage is off on the + or — side
relative to 0 V. (Refer to triangular wave refer-
ence waveform).
4. Depending on the offset voltage, connect the
dual-trace oscilloscope to main board test point
TPS7 or TP58.
Offset voltage
. Connection
difference
= TP 58 (1C507 (1) )
+ TP 57 (iC507 (@))
5. Observe the oscilloscope waveform, and adjust
RV503 so that pulse width is less than 200nS.
when R548 is mounted, adjust pattern con-
nection of R548 and RV503 together.
After adjustment, check the waveform for the
other test point (TP57 or TP58). If the pulse
width is over 200nS, the test point connection
was wrong in step 4. Repeat step 4.
@ Waveform for reference
VOLT/DIV: 1 V
TIME/DIV: 5 wS
ov
Seen ge «
Adjust this width to less than 200nS.
6. Connect the dual-trace oscilloscope as in step 1
and confirm that the triangular wave separation
or overlap amount is within 0.2 V.
@ Triangular wave reference waveform
(shows offset voltage off in one direction)
VOLT/DIV: 50 mV TIME/DIV: 50 pS
upper: TP14 (10504 G), Gi)
lower: TP15 (10504 (6), @))
offset voltage
Waveform separation or overlap
amount should be within 0.2 V.
qs
B)
5.
D-5/D-50
After adjustment, release service mode. (Refer
to pages 9-11). dua/-trace oscilloscope
: (DC range)
Simple Method
main board
+ +
rs,
TP14 O—___-O
TP15 OY L ec}. Ss
Connect the dual-trace oscilloscope to main
board test points TP14 and TP15.
Put the set into service mode (refer to pages
9-11).
Observe the oscilloscope waveform and confirm
if offset voltage is off on the + or — side relative
to OV. (Refer to triangular wave reference
waveform),
Depending on the offset voltage, adjust RV503
so that the tips of triangular wave are 0 V as
fig. @ and © below.
When R548 is mounted, adjust pattern ‘connec-
tion of R548 and RV503 together.
Waveform for adjustment
® When offset voltage is off in — direction.
( Adjust that the upper tips of waveform are 0 V.)
VV
A
A
'B) When offset voltage is off in + direction.
(Adjust that the lower tips of waveform are OV.)
OV hh
After adjustment, release service mode (See
page 9-11.)
@® Waveform for reference
(Offset voltage is off in — direction)
upper: TP14 (10504 (6), @)) VOLT/DIV: 100mV |
lower: TP15 (1C504 ©, (8)) TIME/DIV: 10 pS
+
b
is { ii
i =] T oll
| { |
Ov
TP57
when off
is off in F