Sony PCMR-700 Service manual

PCM-R700

SERVICE MANUAL

Ver 1.1 2002.01

SPECIFICATIONS

Recording section

T ape Digital audio tape Recording head Rotary head Recording time Standard: 120 minutes

Long-play: 240 minutes (DT-120)

Tape speed Standard: 8.15 mm/s

Long-play: 4.075 mm/s

Drum rotation Standard: 2,000 rpm

Long-play: 1,000 rpm

Error correction Double-encoded Reed Solomon code

Tape section

Track pitch 13.6 µm (20.4 µm) Sampling frequency 48 kHz, 44.1 kHz, 32kHz Modulation system 8-10 modulation Transfer rate 2.46 Mbit/sec Number of channels 2 channels, stereo D/A conversion Standard: 16-bit linear (quantization) Long-play: 12-bit non-linear

General section

Power requirements Where purchased Power requirements

U.S.A./Canada 120 V AC, 60 Hz Europe/U.K. 230 V AC, 50/60 Hz

US Model

Canadian Model

AEP Model

UK Model

Model Name Using Similar Mechanism PCM-2800 T ape Transport Mechanism Type

Remote commander RM-D757 (supplied)

Remote control system Infrared control Power requirements 3 V DC, with two size-AA (R6) batteries Dimensions Approx 45 × 210 × 26 mm (w/h/d)

Weight Approx 100 g (3.5 oz) incl. batteries

Input connectors

Analog Input Connector Type Input impedance Rated input level

ANALOG Phono(UNBALANCE) plug jack

ANALOG XLR-3 (BALANCE) (FEMALE)

Digital Input Connector Type Input impedance Rated input level

AES/EBU

COAXIAL

/16 × 83/8 × 11/16 inches)

47 kilohms –12 dBs 10 kilohms

or more (balanced)

XLR-3 110 ohms (FEMALE)(balanced) Phono-plug jack

75 ohms 0.5 Vp-p

+4 dBs (factory setting)

–

– Continued on next page –

DATM-58

Power consumption 34 W Dimensions Approx 482 × 145 × 355 mm (w/h/d)

Weight Approx 7.3 kg (16 Ib 2 oz)

9-960-914-12 Sony Corporation

2002A0500-1 Home Audio Company C 2002.1 Published by Sony Engineering Corporation

/4 × 14 inches)

(19 × 5 (not including rack mount adaptor)

DIGITAL AUDIO TAPE DECK

Output connectors

Analog Output

Connector Type

ANALOG Phono-plug (UNBALANCE) jack

ANALOG XLR-3 100 ohms (BALANCE) (MALE) (balanced)

PHONES

Digital Output

Connector Type

AES/EBU

COAXIAL

Variable range of analog (BALANCE) input/output reference level

Maximum analog (BALANCE) output level

Remote switch connectors

Audio characteristics Frequency response

Signal-to-noise ratio

Totalhar monic distortion

Wow and flutter Below measurable limit (± 0.001 % W.

a) The reference lebel corresponds to –20 dB on the peak level meters. b) During analog input sith the SBM function off

Supplied accessories AC power cord (1)

Stereo phoneplug jack

XLR-3 35 ohms (MALE) (balanced) Phono-plug jack

Output impedance

1 kilohm –12 dBs 47 kilohms

100 ohms 0.36 mW 32 ohms

Output impedance

75 ohms 0.5V p-p 75 ohms

+4 dBs to –12 dBs

+24 dBs

DIN connector (8-pin, parallel) Monaural minijack (serial)

Standard: 20-20,000 Hz (±0.5 dB) Long-play: 20-14,500 Hz (±0.5 dB) 90 dB or more (20 kHz LPF, A-weight filter ON)

Standard: 0.05% or less Long-play: 0.3% or less (1 kHz, Reference level ON)

PEAK)

Remote commander (remote) RM-D757 (1) Size-AA (R6) batteries (2) Screws (M5 × 12) (4) Decorative washers (4) Operating instructions (1) Warranty card (U.S.A. and Canadian models only) (1)

Rated output level

+4 dBs (factory setting)

Rated output level

– 110 ohms

Load impedance

10 kilohms or more

Load impedance

20 kHz LPF

SERVICING NOTES

Flexible Circuit Board Repairing

• 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 .

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

CAUTION

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer’ s instructions.

ADV ARSEL!

Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

ADVARSEL

Eksplosjonsfare ved feilaktig skifte av batteri.

Benytt samme batteritype eller en tilsvarende type

anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

VARNING

Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt fabrikantens instruktion.

VAROITUS

Paristo voi räjähtää, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitev almistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

MODEL IDENTIFICATION

– Model Number label (Printed in Back Panel) –

MODEL NO. PCM-R700

DIGITAL AUDIO RECORDER

Design and specifications are subject to change without notice.

US, Canadian model : AC 120 V 60 Hz 34 W AEP, UK Model : AC 230 V

– 2 –

⁄

50/60Hz 34 W

SAFETY CHECK-OUT

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.

LEAKAGE TEST

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 microampers). 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 V OM or battery-operated A C 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)

To Exposed Metal Parts on Set

TABLE OF CONTENTS

1. GENERAL

..................................................................... 4

2. DISASSEMBLY............................................................ 18

3. ADJUSTMENTS.......................................................... 22

4. DIAGRAMS

4-1. Block Diagrams

– Digital Audio Section – .................................................. 29

– Analog Audio Section –.................................................. 31

– System Control Section – ............................................... 33

– Power Section – .............................................................. 35

4-2. Printed Wiring Board – RF Section – ................................ 40

4-3. Schematic Diagram – RF Section –................................... 43

4-4. Printed Wiring Boards – MD Section –............................. 46

4-5. Schematic Diagram – MD Section – ................................. 49

4-6. Printed Wiring Boards – DIGITAL Section – ................... 53

4-7. Schematic Diagram – DIGITAL Section –........................ 57

4-8. Schematic Diagram – AUDIO Section – ........................... 61

4-9. Printed Wiring Boards – AUDIO Section –....................... 65

4-10. Printed Wiring Boards – DISPLAY Section –................... 69

4-11. Schematic Diagram – DISPLAY Section – ....................... 73

4-12. IC Pin Function Description .............................................. 76

5. EXPLODED VIEWS ................................................... 88

0.15 µF

1.5 k

Ω

Earth Ground

AC voltmeter (0.75 V)

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIA GRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

6. ELECTRICAL PARTS LIST .................................... 96

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

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This section is extracted from instruction manual.

SECTION 1

GENERAL

– 4 –

– 5 –

– 6 –

– 7 –

– 8 –

– 9 –

– 10 –

– 11 –

– 12 –

– 13 –

– 14 –

– 15 –

– 16 –

– 17 –

• This set can be dissassembled in the order shown below.

SECTION 2

DISASSEMBLY

COVER (Page 18)

CASSETTE COMPARTMENT MOTOR ASS’Y (M905) (Page 20)

Note: Follow the disassembly procedure in the numerical order given.

MECHANISM DECK SECTION (DATM-58) (Page 19)

DRUM (Page 20)

DRUM DRIVE BOARD, REEL MOTOR (M903) (Page 21)

COVER

Remove the cover to direction of the arrow.

four screws (case) (M3

10)

HOLDER ASS’Y

(Page 19)

CAPSTAN MOTOR (M902) (Page 21)

five screws (case) (M3

10)

– 18 –

MECHANISM DECK SECTION (DATM-58)

Open the window (cassette compartment), remove the four claws to direction of the arrow

two screws (PTTWH3

wire (flat type) (31 core) (CN504)

two screws (PTTWH3

four connectors (CN506, 507, 508, 802)

HOLDER ASS’Y

four claws

screw (step)

digital board

nylon washer

SP board

Remove the mechanism deck section (DATM-58) to direction of the arrow

screw (BVTT3

two screws (B2

side plate (R) ass’y

holder ass’y

fulcrum plate ass’y

two screws (B2.6

– 19 –

CASSETTE COMPARTMENT MOTOR ASS’Y (M905)

two screws

(B2.6

screw

(B2.6

slider ass’y

tapping screw (B1.7

capstan belt

tapping screw (B1.7

cassette compartment motor ass’y (M905)

screw (B2.6 × 4)

driving gear

screw (B1.7 × 3)

!¡

chassis (L)

DRUM

flexible board (CN7)

two screws (B 2

pulley

two screws

(B 2

drum

two flexible boards (CN1, 51)

sheet (RF flexible)

Remove the four solders of sheet (RF flexible).

– 20 –

DRUM DRIVE BOARD, REEL MOTOR (M903)

two screws

(B2

drum drive board

screw (B2

two screws (B2

bracket (MD PC board)

two screws

(B2

reel motor (M903)

CAPSTAN MOTOR (M902)

capstan motor (M902)

three screws (P1.7

– 21 –

SECTION 3

ADJUSTMENTS

PRECAUTION

1. The adjustments are performed in the sequence that they are described.

2. The required test tapes are:

TY-7111 (8-909-812-00) ................................. Level

TY-7252 (8-909-822-00) ................................. Tracking

TY-7551 (8-909-814-00) ................................. Function

TY-30B (8-892-358-00)................................... Blank

The required torque meter is:

TW-7131 (8-909-708-71) ................................ FWD

3. Switch and Control Settings REMOTE switch : OFF REC MODE switch : 48k (STANDARD) REC LEVEL control : Minimum PHONE LEVEL control : Minimum

4. Preparation of End Sensor Cassette (1) Push the slider locks of a cassette tape and slide the slider in

the direction of the arrow.

hub hole

slider lock

slider

6. When adjusting tape pass and each guide, as shown below, it is a good practice to remove the holder assy and use the DAT cassette holder (J-8000-002-A). This facilitates adjustment work.

• When removing and installing the holder assy, turn the pulle y

counterclockwise and set loading OUT condition for easy removal and installation.

• When adjusting, turn the pulley clockwise and turn on the

CASSETTE TABLE IN switch (S2) to set loading IN condition. Then, set the test tape.

Step screw

BVTP 3 × 6

Cassette spring

BVTT 3 × 8

Nylon washer

Cassette holder assy

Push down the holder in the direction

hub hole

slider lock

(2) Open the cassette lid and cut tape.

cassette lid

cut tape

slider

tape

(3) Turn the hubs to take-up tape (for both T and S sides).

The end sensor cassette tape for end sensor adjustment is now prepared.

5. Tak e care nev er to turn RV1 and RV2 within the RF AMP board of the cassette compartment section.

7. Test Mode

• To enter the test mode , short between TP (MAIN-TEST) and

the GND on the DIGIT AL board, then turn on the po wer . The meter scale within the fluorescent indicator tube (FL701) will flash. Press the OPEN/CLOSE 6 key and set the test tape. (The specified tape should be used for each adjustment.)

Test Mode (Short between TP (MAIN-TEST) and GND) 1 Have “DPG” display lit in the fluorescent indicator tube.

(Press the AMS + key.)

• S2, T2 and F Guide Adjustments

• End Sensor Adjustment

• Tape Pass Fine Adjustment (×1.5FWD mode)

• DPG Adjustment

2 Have “TR” display lit in the fluorescent indicator tube.

(Press the ” key.)

• FWD Torque Adjustment

• FWD Back Tension

(Torque measurement mode)

Adjustment

• To release the test mode, r emove the short between TP (MAIN-

TEST) and GND. After necessary adjustment is completed, be sure to release the test mode.

– 22 –

8. After adjustment is completed, perform the following checks to verify the tape speed. (1) Check that with the REC MODE switch set to ST AND ARD

48k, tape is normally recorded and played back. (×1)

(2) Check that with the REC MODE switch set to LONG, tape

is normally recorded and played back. (×0.5)

(3) Check that in performing the CUE (” + )) or REVIEW

(” + 0) operation, “kyur kyur” sound is heard. (×3, ×8)

Adjustment Location: mechanism deck block

(4) Check that after performing the FF ( )) or REW (0)

operation, the time display is appropriate. (×16)

(5) Chec k that the AMS (+, =) operation is normal.

T1 guide

S1 guide

S2 guide

T2 guide

F guide

– 23 –

3-1. MECHANICAL ADJUSTMENTS

When replacing any drum related parts, after S2, T2 and F guide adjustments have been made, tape pass fine adjustment (×1.5FWD mode) in Electrical adjustment should be performed.

S2, T2 and F Guide Adjustments

Adjustment Method:

1. Enter the Test Mode 1 (see page 22.) and set the test tape TY- 7252 (8-909-822-00).

2. Set the REC MODE switch to STANDARD 48k and press the AMS + key. While in FWD mode, check that there is no curl on the upper and lower flanges of the S2, T2 and F guides. If any curl is present, put the S2, T2 and F guide of concern back in the high position and adjust by adjusting the direction of tightening.

What is curl?

Curl

Distortion that occurs on tape during FWD operation.

3-2. ELECTRICAL ADJUSTMENTS

End Sensor Adjustment

When removing the holder assy and when replacing the mechanism deck block, this adjustment should be performed.

Adjustment Method:

1. Connect the CH-1 terminal of an oscilloscope to TP (S-END) and the CH-2 terminal to TP (T-END) on the DIGITAL board.

2. Enter the Test Mode 1 (see page 22.) and set the end sensor cassette tape (see page 22.)

3. Set the STOP (p) mode.

4. Adjust RV502 (S-END) and RV501 (T-END) on the DIGITAL board so that the respective peak to peak values of the waveforms on the oscilloscope are 1.2 Vp-p.

FWD Back Tension Adjustment

Adjustment Method:

1. Enter the T est Mode 2 (Torque Measurement Mode) (see page

22.) and set the torque meter TW-7131 (8-909-708-71).

2. Press the PLAY (”) key.

3. Press the AMS + key or = key and adjust so tha t the back tension (S side) is within the range of 8.5 ± 0.5 g•cm.

4. When the torque meter is circulating around, check the indicated value.

5. Verify that the maximum value is less than 19.5 g•cm.

REV Torque Check and REV Back Tension Check

Check Method:

1. After FWD torque adjustment and FWD back tension adjustment are completed, press the PLA Y (”) ke y again and set REV (“) mode.

2. Check that the REV torque value is within the range of 13.5 to

17.5 g•cm and that the REV back tension value is within the range of 7.5 to 11.5 g•cm.

Tape Pass Fine Adjustment (×1.5FWD Mode)

When replacing any drum related parts, be sure to perform this adjustment.

Adjustment Method:

1. Connect the CH-1 terminal of an oscilloscope to TP (RF) and the CH-2 terminal to TP (SWP) on the DIGITAL board.

2. Enter the Test Mode 1 (see page 22.) and set the test tape TY7252 (8-909-822-00).

3. Press the AMS (+) key.

Role of each switch in test mode.

OFFSET

–0 +

WIRED OFF

WIRELESS

ATF : ON STANDARD LONG

ATF : OFF

1.2Vp-p

Adjustment Location: See page 26.

FWD T orque Adjustment

Adjustment Method:

1. Enter the Test Mode 2 (Torque Measurement Mode) (see page

22.) and set the torque meter TW-7131 (8-909-708-71).

2. Press the PLAY (”) key.

3. Press the ) key or 0 key and adjust so that the FWD torque value (T side take-up torque) is within the range of 11 to 13 g•cm.

4. When the torque meter is circulating around, check the indicated value.

48k 44.1k

REMOTE REC MODE

4. Put the REC MODE switch to the LONG (ATF: OFF) position and put the REMOTE switch to either the WIRED or WIRELESS position (OFFSET: – or +), fine adjust both the S1 guide and T1 guide so that the RF signal waveform of the oscilloscope repeatedly contracts and expands in vertical directions as it has the same shape.

* Adjust the direction of tightening to complete this adjustment.

If there is curl on any of the upper and lower flanges of the S2, T2 and F guides, adjust the guide of concern.

– 24 –

5. Put the REC MODE switch to the ST AND ARD 48k (ATF: ON)

position and put the REMOTE switch to either the WIRED or WIRELESS position (OFFSET: – or +), then check the RF signal waveform.

A or less

A’ or les

6. Put the REC MODE switch to the ST AND ARD 48k (AFT : ON) position and put the REMOTE switch to the OFF position (OFFSET: 0), then check the RF signal waveform. (1) Verify that the peak value (B) of the RF signal waveform is

60mV or more.

(2) Verify that the flat position of the RF signal waveform has

undershoots of 10% or less.

or less

Check that there is a difference of 650 ± 15 µsec between the oscilloscope’s SWP signal and the RF signal.

650±15 µsec

Adjustment Location: See page 26.

CHECK AND REPLACEMENT FOR DATE FNCTION Clock IC Back-up Check

• When replacing the lithium battery (BATT501) or replacing any

of the clock IC (IC518) and peripheral parts, the clock will be reset. (The DATE display will be [‘-- -- --] [-[PRESENT] button is pushed.)

] even when the

h--m--s

Perform the back-up check by the following procedure. (1) Connect a DC voltmeter between the DIGITAL board’s TP

(BATT+) as (+) side on the TP (BATT–) as (–) side.

(2) With the PO WER switch of the set OFF, check that the v olt-

age (1) is

less than +20 mV. (If the measured value is more than +20 mV, inspect the IC518 and peripheral parts and replace as needed.)

(3) With the POWER switch of the set ON, check that the volt-

age (1) is

less than 0 mV (minus indication), (If plus indication, inspect the D510 and peripheral parts and replace as needed.)

(4) When these voltages are normal, set the clock to the current

date and time according to the instruction manual. (year/month/day/day of week/hours/minutes/seconds)*

(5) After the clock is set in item (4), turn off the POWER switch

once and in several seconds, turn on the power again and make sure that the clock is operating.

7. If any of the specified values are not satisf ied, repeat items 3 to

Adjustment Location: See page 23.

DPG Adjustment

When replacing any drum related parts, be sure to perform this adjustment.

Adjustment Method:

1. Connect the CH-1 terminal of an oscilloscope to TP (RF) and the CH-2 terminal to TP (SWP) on the DIGITAL board.

2. Enter the Test Mode 1 (see page 22.) and set the test tape TY7252 (8-909-822-00).

3. Put the REC MODE switch to the ST AND ARD 48k (ATF: ON) position and put the REMOTE switch to the OFF position (OFFSET: 0).

4. Press the AMS (+) key.

5. Press the PLAY (”) key.

6. “DPG OK” is displayed in the fluorescent indicator tube.

Adjustment Location: See page 26.

– 25 –

Replacement of Back-up Battery

The back-up battery for clock is designed to serve for more than seven years under normal service conditions (room temperature and ordinary humidity). When replacing the battery, take note of the following:

• Perform the above “Clock IC Back-up Check” and remedy the

cause of battery consumption.

• The open voltage of the battery as removed is 3.0 V or more when

it is new. If this voltage is 2.0 V or less, then battery is fully consumed and needs to be replaced.

• After the battery is replaced, perform the “Clock IC Back-up

Check” again and set the clock.

• The coin type lithium battery (CR2032) is used for replacement.

* For description of the clock setting, see page 6.

Adjustment and Check Locations :

DIGITAL board – component side –

END SENSOR ADJ

(S-END)

RV502

(S-END)

(T-END)

RV501

(T-END)

MAIN–

TEST

(RF)

(SWP)

(BATT+)

(BATT–)

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+ 59 hidden pages