Sony HCD-V5500 / MHC-V5500 / MHC-V7700AV (serv.man2) Service Manual ▷ View online
— 9 —
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.
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.
locking compound.
Adjustment Location:
— Record/playback head (Deck A and B) —
Tape Speed Adjustment
DECK A
DECK B
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.)
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.
• Perform high speed adjustment before normal speed adjustment.
Mode: Playback
* 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 %.
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 10)
Sample Value of Wow and flutter
W.RMS (JIS) within 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
Playback level Adjustment
DECK A
DECK B
Procedure:
— FWD playback Mode —
— FWD playback Mode —
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.
(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
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.
while changing the mode from playback to stop several times.
Adjustment Location: AUDIO board (See page 10)
Speed
*High
Normal
Deck
A
B
A
B
Adjustment
RV652
RV652
RV651
RV651
Frequency counter
5,910 to 6,090 Hz
2,910 to 3,090 Hz
+
–
–
VTVM
set
test tape
P-4-L300
(315 Hz, 0 dB)
P-4-L300
(315 Hz, 0 dB)
Output level measurement point
(See page 8)
(See page 8)
— 10 —
Record Bias Adjustment
DECK B
Procedure:
1.
1.
Record mode
2.
Mode: Playback
3.
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
adjustment level as follows.
4.
If these levels do not adjustment level, adjustment the RV341
(L-CH) and RV441 (R-CH) to repeat steps 1 and 4.
(L-CH) and RV441 (R-CH) to repeat steps 1 and 4.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).
Adjustment Location: AUDIO board
Record Level Adjustment DECK B
Procedure:
1.
1.
Record mode
2.
Playback mode
3.
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
adjustment level as follows.
4.
If these levels do not adjustment level, adjustment the RV401
(L-CH) and RV451 (R-CH) to repeat steps 1 and 4.
(L-CH) and RV451 (R-CH) to repeat steps 1 and 4.
Adjustment Level:
OUTPUT level: –23.8 dB ± 1.0 dB (56.1 to 44.6 mV)
Adjustment Location: MAIN board
Adjustment Location :
[AUDIO BOARD] — Component Side —
[AUDIO BOARD] — Component Side —
[MAIN BOARD] — Component Side —
RV451 Record Level (R)
RV401 Record Level (L)
CNB108
attenuator
set
1) 315 Hz
2) 10 kHz
2) 10 kHz
50.1mV (–23.8dBs)
blank tape
CS-123
CS-123
AF OSC
Input point (See page 8)
RV301 : Playback Level (Deck B L-CH)
RV401 : Palyback Level
(Deck B R-CH)
(Deck B R-CH)
RV651 : Tape Speed (Normal)
RV341 : Record Bias (L-CH)
RV441 : Record Bias (R-CH)
RV652 : Tape Speed
(Hight)
(Hight)
RV311 : Playback Level
(Deck A L-CH)
(Deck A L-CH)
RV411 : Playback Level (Deck A R-CH)
— 11 —
RF Level Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (RF) on BD board.
2.
Turned Power switch on.
3.
Put disc (YEDS-18) in to play the number five track.
4.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
signal level is correct or not.
Note :
A clear RF signal waveform means that the shape “
◊
” can
be clearly distinguished at the center of the waveform.
RF signal waveform
CD SECTION
Note :
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (FE) on BD board.
2.
Connect between test point TP (FEI) and TP (VC) by lead wire.
3.
Turned Power switch on.
4.
Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3 ± 1
Vp-p.
between A and B. And confirm peak to peak level within 3 ± 1
Vp-p.
S-curve waveform
6.
After check, remove the lead wire connected in step 2.
Note :
• Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
BD board
Oscilloscope
TP (FE)
TP (VC)
TP (VC)
A
B
Within 3
±
1 Vp-p
Symmetry
BD board
Oscilloscope
TP (RF)
TP (VC)
TP (VC)
Level : 1.3 Vp-p
+0.25
–0.20
–0.20
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
— 12 —
RF PLL Free-run Frequency Check
Procedure :
1.
1.
Connect frequency counter to TP (PLCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.Confirm
that reading on frequency counter is 4.3218 MHz.
that reading on frequency counter is 4.3218 MHz.
Adjustment Location :
[BD BOARD] — SIDE A —
BD baord
TP (PLCK)
frequency counter
IC103
(PLCK)
IC101
(RF)
(FEI)
(FE)
(VC)
(TE)
VIDEO SECTION
Frequency adjustment
1.
Connect the frequency counter to check point of the VIDEO
board.
board.
2.
Adjust CT401 of the VIDEO board so that the frequency counter
read 13.5 MHz ± 40 Hz at STOP condition.
read 13.5 MHz ± 40 Hz at STOP condition.
[VIDEO BOARD] — SIDE B —
VIDEO board
TP410 (DCLK)
TP410 (DCLK)
frequency counter
SL703 (AFADJ)
SL702 (ADJ)
IC751
IC251
SL701 (CAL BAR)
TP410 (DCLK)
CT401
Frequency
Click on the first or last page to see other HCD-V5500 / MHC-V5500 / MHC-V7700AV (serv.man2) service manuals if exist.