HCD-VR90AV - Sony Audio Service Manual (repair manual)

E Model

MICROFILM

HCD-VR90AV is the tuner, deck, CD and ampli-
fier section in LBT-VR90AV.

Model Name Using Similar Mechanism

HCD-VR50/VR70

CD Mechanism Type

CDM37L-5BD34L

Base Unit Name

BU-5BD34L

Optical Pick-up Name

KSS-213D/Q-NP

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

TCM-230AWR2/230PWR2

CD

Section

Tape deck

Section

Front Speaker:
The following measured at AC 120/220/240V, 50/60Hz
DIN power output (Rated)

130 + 130W
(6 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

160 +160W
(6 

Ω

 at 1 kHz, 10% THD)

Center Speaker:
DIN power output (Rated)

30W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

40W
(8 

Ω

 at 1 kHz, 10% THD)

Rear Speaker:
DIN power output (Rated)

30 + 30W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

40 + 40W
(8 

Ω

 at 1 kHz, 10% THD)

Inputs
PHONO IN (phono jacks):

sensitivity 3mV,
impedance 47k 

Ω

MIX MIC (phone jack):

sensitivity 1mV,
impedance 10k 

Ω

VIDEO1 IN (phono jacks):

sensitivity 250mV,
impedance 47k 

Ω

VIDEO2 IN (phono jacks):

sensitivity 250mV,
impedance 47k 

Ω

MD IN (phono jacks):

sensitivity 450mV,
impedance 47k 

Ω

DVD INPUT
FRONT  (phono jacks):

sensitivity 450mV,
impedance 47k 

Ω

REAR (phono jacks):

sensitivity 450mV,
impedance 47k 

Ω

CENTER (phono jacks):

sensitivity 450mV,
impedance 47k 

Ω

WOOFER (phono jacks):

sensitivity 450mV,
impedance 47k 

Ω

Outputs
PHONES (stereo phone jack):

accepts headphones of
8 

Ω

 or more

VIDEO OUT (phono jack):

voltage 250mV,
impedance 1k 

Ω

MD OUT (phono jacks):

voltage 250mV,
impedance 1k 

Ω

WOOFER OUT (phono jack):

voltage 1V,
impedance 1k 

Ω

FRONT SPEAKER:

accepts impedance of 8
to 16 

Ω

CENTER SPEAKER:

accepts impedance of 8
to 16 

Ω

REAR SPEAKER:

accepts impedance of 8
to 16 

Ω

— Continued on next page —

Inputs
VIDEO1 IN (phono jacks):

1Vp-p, 75 

Ω

VIDEO2 IN (phono jacks):

1Vp-p, 75 

Ω

DVD INPUT VIDEO (phono jacks):

1Vp-p, 75 

Ω

Output
VIDEO OUT (phono jack):

1Vp-p, 75 

Ω

S-VIDEO OUT (4-pin/mini-DIN jack):

Y : 1Vp-p, unbalanced,
      Sync negative,
C : 0.286 V p-p,
      load immpedance
      75 

Ω

2

System

Compact disc and digital audio and video system

Laser

Semiconductor laser
(

λ

=780nm) Emission

duration: continuous

Laser output

Max. 44.6µW*
* This output is the value measured at a distance of
200 mm from the objective lens surface on the Optical
Pick-up Block with 7 mm aperture.

Wave length

780 – 790 nm

Frequency response

2Hz – 20kHz (±0.5dB)

Signal-to-noise ratio

More than 90 dB

Dynamic range

More than 90 dB

Video color system format

NTSC, PAL

CD DIGITAL OUT
(square optical connector jack, rear panel)
Wave length:

660 nm

Output level:

–18dBm

Recording system

4-track 2-channel stereo

Frequency response (DOLBY NR OFF)

40 – 13,000Hz (±3dB),
using a Sony TYPE I
cassette
40 – 14,000Hz (±3dB),
using a Sony TYPE II
cassette

Wow and flutter

±0.15% W.Peak (IEC)
0.1% W.RMS (NAB)
±0.2% W.Peak (DIN)

FM stereo, FM/AM superheterodyne tuner

Tuning range

87.5 – 108.0 kHz
(100 kHz step)

Antenna

FM wire antenna

Antenna terminals

75 

Ω

 unbalanced

Intermediate frequency 10.7 MHz

Tuning range
Middle Eastern model : 531 – 1,602 kHz

(with the tuning interval set at 9 kHz)

Other models :

531 – 1,602 kHz

(with the tuning interval set at 9 kHz)
530 – 1,710 kHz
(with the tuning interval set at 10 kHz)

Antenna

AM loop antenna, External antenna terminals

Intermediate frequency 450 kHz

Power requirements
Thai model :

 220 V AC, 50/60 Hz

Other models :

120 V, 220V, or 230 – 240 V AC, 50/60 Hz
Adjustable with voltage selector

Power consumption

280 W

Dimensions (w/h/d)

Approx. 356 

×

 423 

×

 446 mm

incl. projecting parts and controls

Mass

Approx. 15.0 kg

Supplied accessories

AM loop antenna (1)
Remote RM-SV100AVB (1)
R6 (size AA) batteries (2)
FM wire antenna (1)
Speaker cords (2)
Video connecting cable

Design and specifications are subject to change without notice.

3

!

!

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

The following caution label is located inside the unit.

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

• Keep the temperature of soldering iron around 270˚C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

• Abbreviation

IA

: Indonesia model

EA

: Saudi Arabia model

MY

: Malaysia model

SP

: Singapore model

TH

: Thai model

Parts No.

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output four times.

PARTS No.

MODEL

4-214-793-0

π

MY,SP

4-214-793-1

π

EA

4-214-793-3

π

IA

4-214-793-4

π

TH

4

6-15. Schematic Diagram     Deck Section ································ 40
6-16. Printed Wiring Board     Deck Section ····························· 41
6-17. Printed Wiring Board     Power Section ··························· 42
6-18. Schematic Diagram     Power (1/2) Section ····················· 43
6-19. Schematic Diagram     Power (2/2) Section ····················· 44
6-20. Schematic Diagram     Surround Section ························· 45
6-21. Printed Wiring Board     Surround Section ······················· 45
6-22. Schematic Diagram     FL Section ···································· 46
6-23. Printed Wiring Board     FL Section ································· 47
6-24. Schematic Diagram     Panel VR Section ························· 48
6-25. Printed Wiring Board     Panel VR Section ······················ 49
6-26. Schematic Diagram     TC Panel Section ························· 50
6-27. Printed Wiring Board     TC Panel Section ······················· 51
6-28. Schematic Diagram     CD Panel Section ························· 52
6-29. Printed Wiring Board     CD Panel Section ······················ 53
6-30. Schematic Diagram     CD Motor Section ························ 54
6-31. Printed Wiring Board     CD Motor Section ····················· 55
6-32. Schematic Diagram     Jack Section ································· 56
6-33. Printed Wiring Board     Jack Section ······························ 57
6-34. Schematic Diagram     Trans Section ······························· 58
6-35. Printed Wiring Board     Trans Section ····························· 59
6-36. Schematic Diagram     Leaf SW Section ·························· 59
6-37. Printed Wiring Board     Leaf SW Section ······················· 59
6-38. IC Block Diagrams ··························································· 60
6-39. IC Pin Functions ······························································· 61

7-1.

Case and Back Panel Section ··········································· 69

7-2.

Front Panel Section 1 ······················································· 70

7-3.

Front Panel Section 2 ······················································· 71

7-4.

Chassis Section ································································· 72

7-5.

TC Mechanism Section 1 (TCM230AWR2/230PWR2) ·· 73

7-6.

TC Mechanism Section 2 (TCM230AWR2/230PWR2) ·· 74

7-7.

CD Mechanism Section (CDM37M-5BD32L) ················ 75

7-8.

Base Unit Section (BU-5BD32L) ····································· 76

······································· 77

·········································································· 5

2-1.

Front Panel ········································································· 7

2-2.

Main Board ········································································· 7

2-3.

Sub Panel ············································································ 8

2-4.

CD-L/CD-R Board and CD Lid Assembly ························· 8

2-5.

Tape Mechanism Deck and Cassette Lid ···························· 9

2-6.

CD Mechanism Deck ························································· 9

2-7.

Base Unit ············································································ 9

2-8.

Disc Table ········································································· 10

···························································· 11

····························· 15

······························· 15

6-1.

Circuit Boards Location ··················································· 19

6-2.

Block Diagrams
BD Section ······································································· 20
Video Section ··································································· 21
Deck Section ····································································· 22
Main (1/2) Section ···························································· 23
Main (2/2) Section ···························································· 24
Power Section ··································································· 25
Display Section ································································· 26

6-3.

Printed Wiring Board     BD Section ································ 28

6-4.

Schematic Diagram     BD Section ··································· 29

6-5.

Printed Wiring Board     Video Section ···························· 30

6-6.

Schematic Diagram     Video (1/3) Section ······················ 31

6-7.

Schematic Diagram     Video (2/3) Section ······················ 32

6-8.

Schematic Diagram     Video (3/3) Section ······················ 33

6-9.

Printed Wiring Board     Main Section ····························· 34

6-10. Schematic Diagram     Main (1/5) Section ······················· 35
6-11. Schematic Diagram     Main (2/5) Section ······················· 36
6-12. Schematic Diagram     Main (3/5) Section ······················· 37
6-13. Schematic Diagram     Main (4/5) Section ······················· 38
6-14. Schematic Diagram     Main (5/5) Section ······················· 39