Sony D-99 - Section 3 ELECTRICAL ADJUSTMENTS; Notes on Adjustment; Preparation and Checks; +3.4 V Adjustment

D-99
SECTION 3
ELECTRICAL ADJUSTMENTS
Notes on Adjustment
1, Perform adjustments except for BATTERY REMAINS
ADJUSTMENT in service mode,
Be sure to release service mode after completing
adjustment,
(Refer to “Service Mode (service program)” on page 4,)
2, Perform adjustments in the order given,
3. Use YEDS-18 disc (part No, : 3-702-101-01) only indicated,
4, Power supply voltage: DC 9V
HOLD switch : OFF
VOLUME knob: MIN
PREPARATION
Put the set into service mode (See page 4.) and perform
the following checks,
* Sled Motor Check
1, Press the OPEN button and open the top panel.
2. Press the >Wl,l4 keys and make sure that the optical
pick-up block moves smoothly, without catching, from
the inmost—~outmost—inmost circumference,
>I: UPF moves outward
K4: UPF moves inward
*Focus Search Check
1, Press the OPEN button and open the top panel.
2, Press thed{l key. (Focus search is performed continuously.)
3. Observe the UPF objective lens and check that it moves
smoothly up and down with no catching or noises.
4. Press the MM key.
Check that focus search operation stops, If it does not,
press the Mf key again.
Battery Remains Indication Adjustment
Adjustment procedure:
VOM
(DC range)
main board
TP3 (VREF)
TP4 (IC802@)
1, Apply DC 3.5V both side of battery terminal,
2, Insert the disc (YEDS-18) and press the bllkey.
3. Adjust RV801 so that the voltage of TP4 (IC802dD) is
the same as TP3 (V REF),
+3,.9V Adjustment
Adjustment Procedure :
1, Put the set into STOP state service mode (see page 4),
2. Connect the VOM to main board test point TP(+3.9V).
3. Adjust RV401 for 3.95V-4V reading on the VOM.
4, After adjustment, release service mode (see page4),
+3.4V Adjustment
Adjustment Procedure :
1. Put the set into STOP state service mode (see page4).
Connect the VOM to main board test point TP (+3,4V).
Adjust RV402 for 3.45V to 3.5V on the VOM reading,
After adjustment, release service mode (see page 4),
+3.6V Adjustment
Adjustment Procedure :
1, Apply DC 3V both side of battery terminal,
2. Connect the VOM to main board test point TP7
(collector of Q487).
Insert the disc (YEDS-18) and close the top panel.
Press the Dll key.
Adjust RV450 for 3.65V to 3.7V on the VOM reading.
PLL Free Run Frequency Check and Adjustment
Check/“Adjustment Procedure :
= WON
a w
frequency counter
TP (PLCK) ~t,-—
p=
1, Disconnect EFM solder jumper terminal on the main
board,
2, Connect a frequency counter to main board test point
TP8(IC601 @).
3. Put the set into service mode (See page 4),
4, Check that the frequency counter reading is 4,35+0,01
MHz. If not, adjust RV504 so that it is 4,85+0,01MHz,
After adjustment, release service mode (see page4),
6. Short the jumper terminal disconnected in step 1,
main board
ol