DOWNLOAD Sony HCD-XG100AV / HCD-XG900AV Service Manual ↓ Size: 9.16 MB | Pages: 85 in PDF or view online for FREE

Model
HCD-XG100AV HCD-XG900AV
Pages
85
Size
9.16 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-xg100av-hcd-xg900av.pdf
Date
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13
HCD-XG100AV/XG900AV
[Aging Mode]
This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
• If an error occurred:
The aging operation stops and display then status.
• If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Load the tapes into the decks A and B respectively.
2. Press the 
[FUNCTION]
 button to select the function “CD”.
3. Press the 
[PLAY MODE]
 button to set the “ALL DISCS” mode,
and press the 
[REPEAT]
 button to “REPEAT” off.
4. Press three buttons of 
[    /CLOCK SET]
, 
[ENTER/NEXT]
,
and 
[DISC 4]
 simultaneously.
5. The aging mode is activated, if the indicator of disc tray num-
ber on the fluorescent indicator tube is blinking.
6. To release from the aging mode, press the
?
/
1
button to turn
the power OFF and operate the cold reset. (Refer to the “MC
Cold Reset”)
1. Display at the Aging Mode
• Display operating state of tape deck section alternately.
• If an error occurred, stop display.
2. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (Tape deck section) :
Rewind the tape A and B
“TAPE A AG-1”
Shut off
FWD play the tape A
“TAPE A AG-2”
2 minutes
Fast forward the tape A
“TAPE A AG-3”
Shut off or 20 seconds
REV play the tape A
“TAPE A AG-4”
2 minutes
Rewind the tape A
“TAPE A AG-5”
Shut off
FWD play the tape B
“TAPE B AG-2”
2 minutes
Fast forward the tape B
“TAPE B AG-3”
Shut off or 20 seconds
REV play the tape B
“TAPE B AG-4”
2 minutes
Rewind the tape B
“TAPE B AG-5”
Shut off
Note:
 “TAPE 
*
 AG-
*
” is display of each step.
c
14
HCD-XG100AV/XG900AV
SECTION  5
MECHANICAL  ADJUSTMENTS
SECTION  6
ELECTRICAL  ADJUSTMENTS
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 demagne-
tizer.
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
Mode
Torque Meter
Meter Reading
3.1 to 6.96 mN•m
FWD
CQ-102C
(31 to 71 g•cm)
(0.43 – 0.98 oz•inch)
FWD
0.20 to 0.58 mN•m
back tension
CQ-102C
(2 to 6 g•cm)
(0.03 – 0.08 oz•inch)
3.1 to 6.96 mN•m
REV
CQ-102RC
(31 to 71 g•cm)
(0.43 – 0.98 oz • inch)
REV
0.20 to 0.58 mN•m
back tension
CQ-102RC
(2 to 6 g•cm)
(0.03 – 0.08 oz • inch)
6.97 to 14.02 mN•m
FF/REW
CQ-201B
(71 to 143 g•cm)
(0.99 – 1.99 oz • inch)
9.80 mN•m
FWD tension
CQ-403A
(100 g or more)
(3.53 oz or more)
9.80 mN•m
REV tension
CQ-403A
(100 g or more)
(3.53 oz or more)
Precaution
1. Demagnetize the record/playback head with a head demagne-
tizer.
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 ad-
justment 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 other-
wise specified.
8. Set to  the DOLBY NR OFF.
9. Set to the test mode.
(1) Press the
?
/
1
button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of 
[    /CLOCK SET]
, 
[ENTER/NEXT]
,
and 
[DISC 3]
 simultaneously, to set the tape deck test mode
and displays “TEST MODE”  on the fluorescent indicator
tube.
(4) To release from the test mode, press the
?
/
1
button.
• Test Tape
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
Playback Level Adjustment
0 dB = 0.775 V
DECK  SECTION
c
15
HCD-XG100AV/XG900AV
Tape Speed Adjustment
DECK B
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the H button on the deck B.
3. Press the 
[H SPEED 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 
±
 180 Hz.
5. Press the 
[H SPEED DUB]
 button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 
±
 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
Playback Level Adjustment
DECK A      DECK B
Procedure:
Mode: Playback
Deck A is RV311 (L-CH), Deck B is RV301 (L-CH) so that ad-
justment within specification values as follows.
Specification Values:
J701 PB level: 301.5 to 338.3 mV (– 8.2 to – 7.2 dB) level
difference between the channels: within 
±
 0.5 dB
Adjustment Location: AUDIO board
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. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
set
test tape
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
MD OUT jack (J701)
L-CH
+
–
set
test tape
WS-48B 
(3 kHz, 0 dB)
MAIN board
MD OUT jack (J701)
L-CH, R-CH
frequency counter
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
MD OUT jack (J701)
L-CH
level meter
Record/Playback Head Azimuth Adjustment
Note:
 Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
DECK A      DECK B
set
MAIN board
MD OUT jack (J701)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
reverse
forward
16
HCD-XG100AV/XG900AV
REC Bias Adjustment
   DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.
Specification values: Playback output of 315 Hz to playback
output of 10 kHz: 
±
 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment
   DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
Specification values:
J701 PB level:  47.2 to 53.0 mV (– 24.3 to – 23.3 dB)
Adjustment Location: MAIN board
attenuator
set
MAIN board 
VIDEO AUDIO IN jack (J701)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
50 mV (– 23.8 dB)
600 
Ω
blank tape
CN-123
AF OSC
+
–
set
recorded
portion
MAIN board
MD OUT jack (J701)
L-CH, R-CH
level meter
set
MAIN board
VIDEO AUDIO IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)
blank tape
CS-123
600 
Ω
attenuator
AF OSC
+
–
set
recorded
portion
MAIN board
MD OUT jack (J701)
L-CH, R-CH
level meter
RV301
RV341
RV311
IC602
CN601
R L
 
RV441
PB LEVEL
 (L)
– DECK B –
REC BIAS
PB LEVEL (L)
– DECK A –
– AUDIO BOARD (Component Side) –
TAPE SPEED
RV1002
RV1001
(NORMAL)  (HIGH)
CN1001
– LEAF SW BOARD (Component Side) –
MD OUT
L/R
IC301
REC LEVEL
RV301
L-CH
RV351
R-CH
VIDEO
AUDIO IN
L/R
J701
– MAIN BOARD (Conductor Side) –
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