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Model
HCD-DP800AV MHC-DP800AV
Pages
83
Size
9.03 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-dp800av-mhc-dp800av.pdf
Date

Sony HCD-DP800AV / MHC-DP800AV Service Manual ▷ View online

16
HCD-DP800AV
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press  `/1  button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons  ENTER  ,  DISC 1  , and  x   simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, press  M  button to move the
pickup to outside track, or press  m  button to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press  `/1  button to turn the set OFF.
Note:
• Always move the pickup to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
[VACS ON/OFF MODE]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the three buttons  x  ,  ENTER  and  SPECTRUM  or
KARAOK PON  simultaneously.
[REPEAT 5 LIMIT OFF MODE]
• This mode is used to enable infinite repetitions.
Normally, the number of repetitions allowed is 5.
Procedure:
1. Press the  `/1  button to turn ON the power supply.
2. Set the function “CD”.
3. Press the three burtons  ENTER ,  DISC 3 , and  x    is
simultaneously.
4. Infinite repetitions is enabled.
5. This state is maintained ( memorized ) until COLD RESET is
executed.
17
HCD-DP800AV
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK  SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual.  (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
Level Adjustment
DECK A      DECK B
Note:  Perform this adjustments for both decks
Procedure:
1. Mode:  Playback
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
set
main board
CN301
Pin 
3 (L-CH)
Pin 
1 (R-CH)
main board
CN301
Pin 
2 (GND)
+
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
18
HCD-DP800AV
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode:  Playback
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Tape Speed Adjustment
DECK B
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
 CD SYNC HI-DUB 
 button.
Procedure:
1. Turn the power switch on.
2. Press the x button,  DISPLAY  button and  DISC 3  button
simultaneously.
(Cursor segment flash on the FL display tube.)
To exit from the test mode, press the ?/1 button.
Mode:  Playback
1. Insert the WS-48B into the deck B.
2. Press the Y button on the deck B.
3. Press the  CD SYNC HI-DUB  button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 
± 30 Hz.
5. Press the  CD SYNC HI-DUB  button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 
± 15 Hz.
Adjustment Location:  LEAF SW board
Playback level Adjustment
DECK A      DECK B
Procedure:
Mode:  Playback
Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.
Adjustment Level:
CN301 PB level:  334 to 375 mV (–6.8 dB 
± 0.5 dB) level
difference between the channels:  within 
±0.5 dB
Adjustment Location:  MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin 1
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
° 90° 135° 180°
good
wrong
pin 2
pin 3
L
R
+
set
test tape
WS-48B 
(3 kHz, 0 dB)
main board
CN301 (Pin 
3 : L-CH)
(Pin 1 : R-CH)
frequency counter
+
set
test tape
P-4-L300
(315 Hz, 0 dB)
main board
CN301 (Pin 
: L-CH)
(Pin : R-CH)
level meter
forward
reverse
19
HCD-DP800AV
4. Mode:  Record
5. Mode:  Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level:  33.4 to 37.5 mV (–27.3 to –26.3 dB)
Adjustment Location:  MAIN board
[MAIN  BOARD] (Component Side)
[LEAF  SW  BOARD]  (Component Side)
REC Bias Adjustment
   DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This  “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotette
of shuttle knob then rewind to recording start position.)
1. Press  MD (VIDEO)  button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press  REC PAUSE/START  button, press REC PAUSE/
START button, then recording start.
4. Mode:  Record
5. Mode:  Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV304
(L-CH) and RV354 (R-CH) on the AUDIO board to repeat steps
4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz:  
±1.0 dB
Adjustment Location:  MAIN board
REC Level Adjustment
   DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This  “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
1. Press  MD (VIDEO)   button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press  REC PAUSE/START  button, press REC PAUSE/
START button, then recording start.
attenuator
set
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dB)
600 
blank tape
CN-123
AF OSC
+
set
recorded
portion
CN301 (Pin : L-CH)
(Pin : R-CH)
level meter
set
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB)
blank tape
CS-123
600 
attenuator
AF OSC
+
set
recorded
portion
CN301 (Pin : L-CH)
(Pin : R-CH)
level meter
TAPE SPEED
RV1002
RV1001
(NORMAL)  (HIGH)
CN1001
CN301
RV354
RV304
RV351
CN304
T11
RV11
RV302
RV301
RV303
REC LEVEL (L)
(B)
PB LEVEL (L)
(A)
PB LEVEL (L)
(B)
REC LEVEL (R)
(B)
REC BIAS (R)
(B)
REC BIAS (L)
(B)
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