DOWNLOAD Sony HCD-XGR90AV / LBT-XGR90AV Service Manual ↓ Size: 5.87 MB | Pages: 78 in PDF or view online for FREE

Model
HCD-XGR90AV LBT-XGR90AV
Pages
78
Size
5.87 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-xgr90av-lbt-xgr90av.pdf
Date

Sony HCD-XGR90AV / LBT-XGR90AV Service Manual ▷ View online

16
HCD-XGR90AV
FWD the tape A
“TAPE A AG-2”
Fast forward the tape A
“TAPE A AG-3”
RVS the tape A
“TAPE A AG-4”
Rewind the tape A
“TAPE A AG-5”
FWD the tape B
“TAPE B AG-2”
Rewind the tape A
“TAPE A AG-1”
Fast forward the tape B
“TAPE B AG-3”
RVS the tape B
“TAPE B AG-4”
Rewind the tape B
“TAPE B AG-5”
Shut off
2 minutes
Shut off or 20 seconds
2 minutes
Shut off
2 minutes
Shut off or 20 seconds
2 minutes
Shut off
Aging mode sequence (Tape deck section):
2. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Note:
 “TAPE * AG- * ” is display of each step.
3. CD Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (CD section):
DISC 1
chucking
TOC Read
Track 1 Play
Tray Tun
Tray Turn
DISC 4
Chucking
2 seconds
Last Track Play
TOC Read
Track 1 Play
Last Track play
[VACS ON/OFF]
• The volume control by VACS is turned ON/OFF.
Procedure:
1. Press the  \/1  button to turn the power ON.
2. Press the  PLAY MODE  and  \/1  buttons simultaneously.
3. The reaction display appears when switcing ON/OFF.
2 seconds
2 seconds
17
HCD-XGR90AV
Torque Measurement
Mode
Torque Meter
Meter Reading
2.9~6.9 mN•m
FWD
(30 to 70 g•cm)
(0.42 – 0.97 oz•inch)
FWD
     CQ-102C
0.19~0.59 mN•m
back tension
 (2 to 6 g•cm)
(0.03 – 0.08 oz•inch)
7.8~16.7 mN•m
FF/REW
     CQ-201B
 (80 to 170 g•cm)
(1.11 – 2.36 oz • inch)
SECTION 5
MECHANICAL 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.
SECTION 6
ELECTRICAL ADJUSTMENTS
   DECK SECTION     0 dB = 0.775 V
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
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 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  c/CLOCK SET  ,  TUNER ENTER ,
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
18
HCD-XGR90AV
Record/Playback Head Azimuth Adjustment
   DECK A
 DECK B
Note:
 Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
set
MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH
+
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
3. Mode: Playback
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 (VIDEO) OUT jack (J701)
L-CH
4. Repeat step 1 to 3 in playback (REV) mode.
5. 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
Mode: Playback
+
set
test tape
WS-48B 
(3 kHz, 0 dB)
MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH
frequency counter
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 RV392 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 RV391 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: MAIN board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
         (WS-48B)
forward
reverse
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.
19
HCD-XGR90AV
REC Bias Adjustment      DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
attenuator
set
MAIN board 
MD(VIDEO) IN jack (J701)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
50 mV (– 23.8 dB)
600 
blank tape
CS-123
AF OSC
2. Mode: Playback
+
set
recorded
portion
MAIN board
CN301 pin 
1
 (L-CH)
            pin 
3
 (R-CH)
level meter
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 RV321
(L-CH) and RV322 (R-CH) on the MAIN board to repeat
steps 1and 2.
Adjustment level: The playback output of 10kHz level difference
      against 315 Hz reference should ±0.5 dB.
Adjustment Location: MAIN board
REC Level Adjustment     DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
set
MAIN board
MD (VIDEO) IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)
blank tape
CS-123
600 
attenuator
AF OSC
2. Mode: Playback
+
set
recorded
portion
MAIN board
CN301 pin 
1
 (L-CH)
            pin 
3
 (R-CH)
level meter
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 RV351
(L-CH) and RV301 (R-CH) on the MAIN board to repeat steps
1 and 2.
Specification values:
CN301 playback level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Component Side) –
1
19
1
15
CN431
CN371
1
3
IN
OUT
MD (VIDEO)
CN301
IC301
IC501
RV321
REC BIAS
(L-CH)
RV351
REC LEVEL
(L-CH)
RV301
REC LEVEL
(R-CH)
RV391
TAPE SPEED
(NORMAL)
RV392
TAPE SPEED
(HIGH)
RV322
REC BIAS
(R-CH)
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