CMT-HP7, HCD-HP7 - Sony Audio Service Manual (repair manual)

US Model

Canadian Model

AEP Model

 UK Model

E Model

Australian Model

2005J16-1

© 2005.10

HCD-HP7 is the Amplifier, CD player, Tape
Deck and Tuner section in CMT-HP7.

System

Compact disc and digital 
audio system

Laser

Semiconductor laser 
(

λ

=780 nm)

Emission duration: 
continuous

Frequency response

2 Hz – 20 kHz (

±0.5 dB)

Wavelength

780 – 790 nm

Signal-to-noise ratio

More than 90 dB

Dynamic range

More than 90 dB

Recording system

4-track 2-channel, stereo

Frequency response

50 – 13,000 Hz (

±3 dB), 

using Sony TYPE I 
cassettes

With 6 ohm loads, both channels driven, from 
120 – 10,000 Hz: rated 60 watts per channel 
minimum RMS power, with no more than 10% 
total harmonic distortion from 250 milliwatts to 
rated output.

Continuous RMS power output (reference):

60 + 60 watts (6 ohms at 1 
kHz, 10% THD)

Total harmonic distortion less than 0.7% (6 ohms at 1 

kHz, 30 W)

DIN power output (rated): 60 + 60 watts (6 ohms at 1 

kHz, DIN)

Continuous RMS power output (reference):

60 + 60 watts (6 ohms at 1 
kHz, 10% THD)

Music power output (reference):

120 + 120 watts (6 ohms at 
1 kHz, 10% THD)

The following measured at AC 120, 127, 220, 240 V 
50/60 Hz
DIN power output (rated): 60 + 60 watts (6 ohms at 1 

kHz, DIN)

Continuous RMS power output (reference):

60 + 60 watts (6 ohms at 1 
kHz, 10% THD)

Inputs
MD IN (phono jacks):

Sensitivity 250 mV, 
impedance 47 kilohms

Outputs
PHONES (stereo minijack):

accepts headphones of 8 
ohms or more

OPTICAL CD DIGITAL OUT (Supported sampling 
frequency: 44.1 kHz)
SPEAKER:

accepts impedance of 6 to 
16 ohms.

Model Name Using Similar Mechanism

NEW

CD

CD Mechanism Type

CDM69CH-K6BD71C

Section

Base Unit Name

BU-K6BD71C

Optical Pick-up Name

KSM-213D

TAPE

Model Name Using Similar Mechanism

HCD-EP515

Section

Tape Transport Mechanism Type

CMAL1Z234A

2

0

0

0

Power requirements
North American model:

120 V AC, 60 Hz

European and Russian models:

230 V AC, 50/60 Hz

Australian model:

230 – 240 V AC, 50/60 Hz

Mexican model:

120 V AC, 60 Hz

Other models:

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

Power consumption
European and Russian models:

100 watts
0.35 watts (at the Power 
Saving Mode)

Other models:

100 watts

Dimensions (w/h/d)

Approx. 199   252   400 
mm

Mass

Approx. 7.0 kg

Supplied accessories:

Remote Commander (1)
Batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Speaker pads (8)

Design and specifications are subject to change 
without notice.

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range
Russian model:

65.0 – 74.0 MHz
(There is no stereo effect)
87.5 – 108.0 MHz

Other models:

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

AM tuner section

Tuning range
Pan-American model:

530 – 1,710 kHz 
(with the tuning interval 
set at 10 kHz)
531 – 1,710 kHz 
(with the tuning interval 
set at 9 kHz)

European, Russian, Middle Eastern models:

531 – 1,602 kHz 
(with the tuning interval 
set at 9 kHz)

Other models:

530 – 1,710 kHz 
(with the tuning interval 
set at 10 kHz)
531 – 1,602 kHz 
(with the tuning interval 
set at 9 kHz)

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz 

3

······················································· 4

·········································································· 6

3-1. Case (Side-L)(Side-R),

Tape Mechanism Deck (CMAL1Z234A) ······················ 9

3-2. Front Panel Section ······················································· 9
3-3. Panel Board ································································· 10
3-4. Back Panel Section ······················································ 10
3-5. MAIN Board ······························································· 11
3-6. PWR AMP Board, Power Transformer ······················· 11
3-7. CD Mechanism Deck (CDM69CH-K6BD71C) ·········· 12
3-8. Base Unit Section ························································ 12
3-9. Base Unit (BU-K6BD71C) ········································· 13
3-10. BD Board ····································································· 13
3-12. SW Board, Bracket (Top) Assy ··································· 14
3-13. CONNECTOR Board ·················································· 15
3-14. Motor (Stocker) Assy (Stocker)(M761) ······················ 15
3-15. Motor (Roller) Assy (Roller)(M781) ··························· 16
3-16. Motor (Mode) Assy (Mode)(M771) ···························· 16
3-17. Rubber Roller (Slider) Assy ········································ 17
3-18. Timing Belt (Front/Rear) ············································· 17
3-19. Cam (Gear) ·································································· 18
3-20. SENSOR Board ··························································· 18

4-1. How to Install the Cam (Eject Lock) ···························· 18
4-2. How to Install the Cam (GEAR) ··································· 18
4-3. How to Install the Gear (MODE C) ······························ 19
4-4. How to Install the Gear (MODE CAM) ······················· 19
4-5. How to Install the Rotary Encoder (S702),

Gear (STOCKER COMMUNICATION) ····················· 20

4-6. How to Install the Stocker Assy ···································· 20

···································································· 22

····························· 23

······························· 24

······································································ 26

8-1. Block Diagram ···························································· 28
8-2. Printed Wiring Boards — BD Board — ······················ 29
8-3. Schematic Diagram — BD Board — ·························· 30
8-4. Printed Wiring Boards — Changer Section — ··········· 31
8-5. Schematic Diagram — Changer Section — ················ 32
8-6. Printed Wiring Boards — Main Section — ················· 33
8-7. Schematic Diagram — Main Section — ····················· 34
8-8. Printed Wiring Boards — Front Section — ················ 35
8-9. Schematic Diagram — Front Section — ····················· 36
8-10. Printed Wiring Boards

— PWR AMP/Power Section — ································· 37

8-11. Schematic Diagram

— PWR AMP/Power Section — ································· 38

8-12. IC Block Diagrams ······················································ 39
8-13. IC Pin Function Description ······································· 42

9-1. Case, Top Panel Section ·············································· 44
9-2. Front Panel Section ····················································· 45
9-3. Chassis Section-1 ························································ 46
9-4. Chassis Section-2 ························································ 47
9-5. CD Mechanism Section-1 (CDM69CH-K6BD71C) ··· 48
9-6. CD Mechanism Section-2 (CDM69CH-K6BD71C) ··· 49
9-7. CD Mechanism Section-3 (CDM69CH-K6BD71C) ··· 50
9-8. CD Mechanism Section-4 (CDM69CH-K6BD71C) ··· 51
9-9. CD Mechanism Section-5 (CDM69CH-K6BD71C) ··· 52
9-10. CD Mechanism Section-6 (CDM69CH-K6BD71C) ··· 53
9-11. Optical Pick-up Section (KSM-213D) ························ 54

······································· 55

4

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

CAUTION

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 dam-

aged by heat.

• Keep the temperature of the 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.

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM

or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a
passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable.  (See Fig. A)

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

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

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 waveforms is output three times.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 ˚C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C .

Caution: The printed pattern (copper foil) may peel away if the

heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.