Sony D-5 - Page 28

ye CHI
djustment
-e oscilloscope
IC range)
+
(TP59)
») main
) pages
‘emem-
— side
e refer-
ect the
t point
adjust
200nS.
n con-
for the
e pulse
rection
@ Waveform for reference
VOLT/DIV: 1V
TIME/DIV: 5 uS
ov
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 uS
upper: TP14 (1IC504 6), GD)
lower: TP15 (1C504 6), @))
offset voltage
Waveform separation or overlap
amount should be within 0.2 V.
B) Simple Method
D-5/D-50 D-5/D-50 |
7. After adjustment, release service mode. (Refer
to pages 9-11). dua/-trace oscilloscope
(DC range)
main board
en,
TP14 O———_©
TP15 O—S era =
1. Connect the dual-trace oscilloscope to main
board test points TP14 and TP1S.
2. Put the set into service mode (refer to pages
9-11).
3. Observe the oscilloscope waveform and confirm
if offset voltage is off on the + or — side relative
to OV. (Refer to triangular wave reference
waveform).
4. 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.)
|
B) When offset voltage is off in + direction.
(Adjust that the lower tips of waveform are OV.)
“VV
5. After adjustment, release service mode (See
page 9-11.)
Ov
@ Waveform for reference
(Offset voltage is off in — direction)
upper: TP14 (1C504 (6), @)) VOLT/DIV: 100mV
lower: TP15 (1C504 (6), (8)) TIME/DIV: 10 uS
Check/ Adjustment Location: Main board
3
of R548 for
RV503 TP14 TPIS
R59 (GND)
TP57 TP58
when offset voltage when offset voltage
is off in + direction is off in — direction
4, pattern connection
PLL FREE RUN FREQUENCY CHECK
AND ADJUSTMENT
Check/ Adjustment Procedure
frequency counter
=z
main board
ooo
TP24
adjustment o—-——_———-O
RV503 {PLCK) Ly
TP14 . Short the jumper point (A) (PLL) in the dia-
gram below.
TP15 :
Connect a frequency counter to main board
test point TP24 (PLCK).
Put the set into service mode (see page 9-11).
Check that the frequency counter reading is
4.3218 +0.04 MHz. If not, adjust L603 so that
it is 4.3218 +0.01 MHz.
After adjustment, release service mode (see
page 9-11).
6. Disconnect the jumper point shorted in step 1.
Check/ Adjustment Location: Main board
L603 PLL solder jumper point
an DC:DC converter Short for checking and adijust-
ee t side ) ment. Disconnect after checking
and adjustment.
PLL solder jumper point (PLCK)