Sony HCD-W550 Service Manual page 7

2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
3. Playback Mode
4. Change the playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location:
— Record/playback head (Deck A and B) —
Tape Speed Adjustment
Note: Start the Tape Speed adjustment as below after setting to the
test mode.
Set to test mode. (Press key switch same time CD STOP
DECK A STOP and DECK B STOP button.)
Test mode off. (Power off.)
Procedure:
• Perform high speed adjustment before normal speed adjustment.
Mode: Playback
Speed Deck Adjustment
A
*High
B
A
Normal
B
* Continue to press HIGH SPEED DUBBING switch (S259) in
playback mode : High speed playback.
Frequency difference between the beginning and the end of the
tape should be within ± 3%.
Frequency difference between deck A and deck B the beginning
of the tape should be within 1.5 %.
Adjustment Location: AUDIO board (See page 8)
Sample Value of Wow and flutter
W.RMS (JIS) within 0.3%
(test tape: WS-48B)
Playback level Adjustment DECK A
Procedure:
— FWD playback Mode —
test tape
P-4-L300
(315 Hz, 0 dB)
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
LINE OUT level : –8.2 to –7.2 dB (301.5 to 338.3 mV)
Level Difference between Channels : within 0.5 dB
Confirm the OUTPUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location: AUDIO board (See page 8)
— 7 —
DECK A DECK B
Frequency counter
RV652
5,910 to 6,090 Hz
RV652
RV651
2,910 to 3,090 Hz
RV651
DECK B
VTVM
+
set
–
Output level measurement point
(See page 6)