Lyrec TR55 TECHNICAL SPECIFICATIONS

1. CONTENTS

2. SPECIFICATIONS

2.1 Technical specifications

2.2 Dimensions

2.3 Accessories

3. GENERAL DESCRIPTION

4. INSTALLATION

4.1 Mains voltage selection

4.2 Connectors

5. OPERATION

5.1 Power

5.2 Tape deck commands

5.3 Start-Stop muting

5.4 Record

5.5 Tape timer

5.6 Search

5.7 Speed display

5.8 Edit facilities

5.9 Variable wind speed

5.10 Edit cue

5.11 Tape cutter

5.12 Splicing block

5.13 Playing tape loops

5.14 Pencil edit

5.15 Speed selector

5.16 Volume

5.17 Headphone output

5.18 Monitor loudspeaker

5.19 Reel size

5.20 Reel types

5.21 Optional settings

6. OPTIONS

6.1 VU-meter bridge

6.1.1 Installation of meter bridge

6.1.2 Adjustment of meter bridge

7. SERVICE and ADJUSTMENTS

7.1 Playback level

7.2 Audio block diagram

7.3 Playback frequency response

7.3.1 Sync adjustments

7.4 Bias adjustment

7.5 Record level

7.6 Record frequency response

7.7 Phase shift adjustment

7.8 Erase adjustment

7.9 Bias traps and DC currents

7.9.1 Output amplifier DC current

7.9.2 Output amplifier bias trap

7.9.3 Playback preamplifier bias trap

7.9.4 Sync preamplifier bias trap

7.9.5 Record amplifier bias trap

7.10 Bias traps, location

7.11 Tape tension servo sensor

7.12 Reel motor control amplifier

7.13 Servo mix amplifier

7.14 Servo limit detector

7.14.1 Tape end stop adjustment

7.14.2 Tape load adjustment

7.14.3 Elapsed time counter

7.15 Edit and start enable

7.16 Reel motor commander

7.17 Tape motion sensor

7.18 Capstan speed detector

7.19 Capstan driver amplifier

7.20 Capstan output amplifier

7.21 Headphone and speaker amplifier

7.22 Pinchroller driver

7.23 Tape lift driver

7.24 Counter opto amplifier

7.25 Parking brakes adjustment

8. SPARE PARTS

9. APPLICATION NOTES and SERVICE BULLETINS

10. DIAGRAMS

2.1 TECHNICAL SPECIFICATIONS LYREC STUDIO RECORDER TYPE TR55

Max. unclipped output level +24 dBm into 200

================================================================== TR55 1/4" TR55-MM 1/2" Tape format: 1/4" 1/2" Track format: NAB or DIN stereo 2/4 track Tape speeds: 38.1 and 19.05 cm/s 9.5 and 19.05 cm/s Long term speed stability: < 0,1 % < 0,1 % Varispeed: +/- 33 % +/- 33 % Tape drive: Direct DC drive Direct DC drive Reels: Up to 14 Up to 14" Reel types: NAB, DIN or CINE NAB Wind speed: max 500 ips/1270 cm/s max 500 ips/1270 cm/s Wind time: ca. 80 s for 1000 m tape ca. 60 s for 2400 ft tape

Stop time: < 3 s from wind < 3 s from wind Start time: < 200 msec < 200 msec Tape tension: 80 p +/- 20% (play) 80 p +/- 20% (play) <175 p any other mode <175 p any other mode Wow & Flutter: <0.04 @ 38 <0.07 @ 19 (RMS wtd) <0.07 @ 19 <0.12 @ 9 Timer accuracy: +/- 0,1% +/- 0,2% Line input: Balanced and floating. Input impedance 10 kohms. -10 to +24 dBm input level (adjustable) to produce 320 nWb/m tape flux.

Line output: Balanced and floating. Output impedance < 40 ohms. Nominal level: 510 nWb/m=+6 dBm 320 nWb/m=+6 dBm @ 19 250 nWb/m=+6 dBm @ 9

ohms. Equalisation: NAB or CCIR NAB Bias system Optional Dolby HX Pro Dolby HX Pro S/N: 64 dBA @ 510 nWb/m 60 dBA @ 320nWb/m

Frequency response: 31-19000 Hz +1/-3 dB 31-18000 Hz +1/-3 dB Crosstalk: >40 dB @ 1 kHz >60 dB @ 1 kHz Erase efficiency: >75 dB @ 1 kHz >75 dB @ 1 kHz Connectors: XLR-type XLR-type Power requirements: 90 - 130V :+/-10% 90 - 130V :+/-10% 200 - 240V :+/-10% 200 - 240V :+/-10% 50/60 Hz, 280 VA 50/60 Hz, 280 VA Weight: Tapedeck: 39 kg Tapedeck: 39 kg Floorstand 20 kg Floorstand 20 kg Working conditions: Ambient temperature range: +10 - +40 C Humidity range : 30 - 90%

Tape dependent specifications refer to BASF 911 or equivalent tape at stated flux. The specifications are subject to change without notice. We reserve the right to make technical modifications without prior notice as technical progress may warrant.

Small differences in component values or circuitry may be found between diagrams and actual electronics. If these changes are of major importance for performance, revised diagrams will be forwarded when printed.

Only figures with tolerances or limit can be considered guaranteed data. Figures without tolerances are informative data, without guarantee (IEC 278, section 5.4 note).

No part of this manual may be reproduced without written consent.

2.2 DIMENSIONS

2.3 LIST OF ACCESSORIES

3. GENERAL DESCRIPTION

The TR55 range of tape decks are expressly designed for the professional user, it has exceptionally fast and precise tape handling with astounding control times.

The TR55 tape deck is available for 1/4 or 1/2 inch tape as well as 0.15" cassette tape (special manual apply).

All tape deck controls are located in a single row at the front of the tape deck.

Full logic allows pushbuttons to be activated in any sequence.

The tape deck is all DC powered with double acting servoed reel motors. The reel motors operate in a push pull system, i.e. bi directional drive. A servomix amplifier controls the interaction between reels so that tape tension is kept constant in all situations. Also during extreme modes like stop, reversing and braking sequences.

Continously variable winding speed from stand still to 500 ips.

All types of reels and reel sizes up to 14" diameter can be used in any combination.

4. INSTALLATION

4.1 MAINS VOLTAGE

Before connecting mains to the recorder, control that the power supply is wired for the correct mains voltage.

The mains transformer has two main windings, and two 10 V windings. By connecting the windings in series and/or parallel, the following mains voltages can be used;

90 - 100 - 110 - 120 - 130 V 200 - 210 - 220 - 230 - 240 V

The voltage selector is found close to the mains transformer. To get access, it is necessary to remove the power supply.

1) Dismount the two 25 pole connectors marked "Remote Control" and "Slave Display" from the back panel.

2) Disconnect both left and tight reel motor power amplifier.

3) Disconnect the flat cable feeding power from the power supply and into the recorder.

4) Unscrew the four screws found in the extreme corners of the back panel.

5) The complete power supply can now be pulled out backwards and the voltage selector will be accessable.

Rear panel connectors: LINE IN: Pin 1 Ground Pin 2 Signal live Pin 3 Signal neutral LINE OUT: Pin 1 Ground Pin 2 Signal live Pin 3 Signal neutral

AUXILLIARY SYNC OUT: RECORD INDICATION: Pin 1 +24 volt when channel 1 is in record. Pin 2 +24 volt when channel 2 is in record. Pin 3 Ground AUDIO REMOTE CONTROL: In/out puts to optional VU meter panel SLAVE DISPLAY OUTPUT: Output for optional slave timer display See drawing 9716 for pin configuration.

REMOTE CONTROL: See drawing 9750 for pin configuration. VARISPEED: See drawing 9750 for pin configuration.

CHASSIS-0 VOLT: Ground link connecting MAINS SAFETY GROUND (CHASSIS) with AUDIO GROUND (O V).

5. LYREC TR55 OPERATING INSTRUCTIONS.

5.1 POWER

Connect the recorder to 220V, 50 or 60Hz. for other voltages, special instructions apply.

Switch power on. The mains switch is located in the center of the grid, extending the front plate to the rear.

When power is switched on, the tape timer is automatically set to zero and tape speed selected to high speed. (NOTE: See customer options).

The stop button will show a flashing light to indicate that the tape is not loaded. (NOTE; See customer options).

Load tape according to drawing 1, where the tape path is shown.

After threading the tape, tape tension can be activated by:

a) Selecting START, WIND or EDIT-WIND. Make sure the tape is loaded properly without any loops before giving any command.

b) Manually "stretching" the tape with one hand on each reel. After half a second tape tension will be activated. (NOTE: See customer options.)

When tape tension is activated, this is indicated by a steady illumination of the STOP button.

The two tape tension servo sensors are of a low inertia type and therefore have a protective cover. The servo sensors control the reel motors to operate in both directions.

WARNING!! Do not tamper with the tape in any way that will cause the servo arms to change position. This will immediately make the reel motors spin.

Do not activate START or WIND functions when tape is not properly loaded.

5.2 TAPE DECK CONTROLS

The basic tape deck controls consist of five illuminated push buttons controlling START, STOP, RECORD, REWIND and FAST FORWARD WIND.

The controls are logically interlocked and can be operated in any sequence.

A few features should be noted. The maximum WIND speed is internally limited to 500 ips. The wind speed can be set to a lower value (internal switch) if required, to suit the winding properties of different tape brands.

The tape lifters in the headblock are activated by servo controlled solenoids. The tape lifters are activated in wind when the tape reaches an internally set tape speed (normally set to 60 ips.)

The pinchroller is also operated by a servo controlled solenoid and apart from in- and out position, it stays in a stand-by position close to the capstan shaft in stop mode.

5.3 START - STOP MUTING

The output of the audioamplifiers are opened in STOP mode. When the tape is started, the amplifier are automatically muted until the tape reaches nominal tape speed. When going from START to STOP, the amplifiers are again muted during the deceleration. (NOTE: See customer options.)

5.3 RECORD

Record is activated by simultaneously pressing START and RECORD, and erase and recording takes place first when the tape reaches nominal speed.

When record mode is entered with running tape, erase and record starts immediately.

5.4 TAPE TIMER

The tape timer is fed from the left tape guide roller. The display shows hours, minutes and seconds correctly at both tape speeds. Half seconds are indicated by a flashng dot. When rewinding through zero, the timer counts positive but with negative prefix.

With the RESET button the timer can at any time be set to 00,00.

5.5 SEARCH

Connected to the tape timer is a search system allowing search to either zero or one cue position. The cue position is set by pressing the button CUE. The cue position is defined at the moment the CUE button is pressed.

When later pressing SEARCH CUE, the tape will wind to the last memorized position.

During search the START button can be pressed. The tape will then go into play when the tape reaches the searched position,

5.6 SPEED DISPLAY

When the tape is running in any mode, the display can be switched to read actual speed in IPS as sensed by the left guide roller. I.e. the display does not show capstan speed but actual tape speed.

The speed display is activated by pressing down the illuminated speed selector button. When the button is released, the display goes back to tape timing without "loosing" any time during the speed readout.

5.7 EDIT FACILITIES

The EDIT button has several functions;

a) When the EDIT button is pressed (in STOP mode), the amplifiers are demuted and the left tape lifter is activated. Tape tension is deactivated and the recorder is ready for manual editing.

b) DUMP MODE. Pressing START while EDIT is held down, deactivates

the take-up motor system to obtain dump mode. The tape timer is active also in dump mode.

c) ANTI DUMP MODE. To play the tape from the waste basket and onto the take-up reel, press the START button and keep it depressed. Make sure the tape does not pass the left tacho idler as this will activate the left reel motor.

5.8 VARIABLE WIND SPEED - EDIT WIND

The lever to control the variable wind speed is found next to the EDIT button. The speed control is touch sensitive and can only be activated by simultaneously holding down the EDIT button and touching the speed control lever. EDIT wind speed is indicated by illumination of both wind buttons and the EDIT button.

When the speed control is active, the winding speed can be continously varied from full rewind to max forward wind and any speed between. Each setting of the speed control, represents a fixed speed.

EDIT WIND can be entered from any mode but can be cancelled by STOP, START or SEARCH.

5.9 EDIT CUE

In winding and varispeed winding, the tape can momentarily be brought in contact with the playback head by pressing the EDIT button. This operation also demutes the amplifiers.

5.10 TAPE CUTTER (OPTIONAL)

The tape cutter is a mechanical device mounted inside and below the headblock. The cutting takes place in front of the playback head gap, which eliminates the need for a tapemarker.

To cut in front of the playback head it is necessary to lift the tape from the head and into cutting position. A tape lifter is automatically activated when the tip of the tape cutter mechanism is touched. Cutting can be done in EDIT, STOP or EDIT WIND mode.

a) Tape cutting in STOP or EDIT WIND mode.

Locate the cutting position by rocking the reels, either manually (STOP mode) or with the EDIT WIND lever (EDIT WIND mode).

When the edit wind lever is in center position the tape will not move.

The cutting lever (located on the rear of the headblock) is touch sensitive and when touched, the right tape lifter is activated. The lever is now pressed further to activate the cutter.

Do not press the cutting lever too fast. It is necessary to allow sufficient time so that the tape lifter has reached its position before the cutting takes place.

b) Tape cutting in EDIT or UNLOAD mode.

When EDIT is selected, tape tension is deactivared, corresponding to unload mode. The cutting position can now only

be found by manually rocking the reels. Cutting is made as described above. Without tape tension the tape is held in position only by the mechanical parking brakes.

5.11 SPLICING BLOCK

A splicing block is located on top of the headblock. It has three cutting slots 45, 60 and 90 degreeswhere the 45 degree slot corresponds to the built in cutter.

In order to firmly hold all kinds of tape the tape groove is slightly curved and the sides have small protruding dovetails.

The proper way to remove the tape after splicing, is to hold both tape ends and pull the tape which will then snap up out of the groove.

5.12 PLAYING A SHORT PIECE OF TAPE WITHOUT REELS - PLAYING TAPE LOOPS

During editing it is sometimes desired to play a piece of tape, which is too short to be loaded the normal way.

Place the tape in the tape path but not around the left tape idler. Select EDIT and then START. Back tension must be obtained by holding the tape with the left hand. As long as the left tacho idler is not turning, the left reel motor will stay neutral.

To play an endless loop, the tape must be threaded so it does not pass the left tacho idler or the servo arms. Back tension must be obtained by manually keeping the tape stretched.

5.13 SOUND ON SOUND EDIT (PENCIL EDIT)

By using the left tape lifter it is possible to fade in a new recording on an earlier recording.

In playback select EDIT, which will activate the erase/record head tape lifter. It is now possible to select RECORD without actually record, as the tape is lifted from the erase and record heads.

The tape lifter can now be defeated and the tape faded in by pressing START. Pressing EDIT will again activate the tape lifter.

5.14 SPEED SELECTOR

Tape speed is factory set to 15 ips when power is switched on. Switching to 7 1/2 ips can only be done in STOP mode. (NOTE: See customer options.)

5.15 VOLUME

The volume control lever controls the monitor volume for either headphones or the built in loudspeaker. The volume control does not affect the line output level.

5.16 HEADPHONE OUTPUT

A 1/4" stereo headphone output is found to the far right of the frontpanel. Connecting a headphone disconnects the built in loudspeaker.

5.17 MONITOR LOUDSPEAKER

A small loudspeaker is built into the frontpanel. The loudspeaker reproduces the sum of both tracks. The loudspeaker can only be turned off by setting the volume control to minimum or by connecting a headphone.

Note: The signal to noise ratio of the headphone/speaker output is lower than that of the line output.

5.18 REELSIZE

As factory supplied, the LYREC TR55 accepts any reel from 1/4" diameter up to 12" (i.e. 1000 meter reels). Tape tension is kept constant with any combination of reel sizes.

The reel motor systems are eccentrically mounted and can be turned 180 degrees by loosening 4 screws. In this position the tapedeck accepts up to 14" reels.

5.19 REEL TYPES

The reeladapters are fixed to the reel platform with a snap-lock device. Three types of adapters are available;

- NAB

- CINE/DIN

- AEG/DIN with or without platter.

5.20 CUSTOMER SELECTABLE OPTIONS

Inside the recorder a DIL-switch is found, where it is possible to select some options. The DIL-switch is located on the tape deck logic motherboard. The motherboard is mounted on gliders and can be pulled out together with the frontpanel after loosening the locking screw with a 3 mm Allen key.

1. AMPLIFIER MUTING AT STOP

Position ON: The audioamplifiers are muted in stop mode and reactivated when the tape reaches nominal tape speed.

OFF: The amplifiers are activated also in stop mode, and only muted during acceleration and deceleration of capstan motor and in WIND mode.

2. MANUAL ACTIVE STAND-BY TENSION

Position ON: When the recorder has lost tape tension, i.e. after edit or tape end, the tape tension can be restored by manually "stretching" the tape with one hand on each reel. Tapetension is also automatically reactivated when going to START, WIND ot EDIT WIND.

OFF: Tape tension can ONLY be reactivated by going to START, WIND or EDIT WIND.

3. DYNAMIC BRAKING INHIBIT

Position ON: The dynamic braking is switched off, resulting in very long braking time. This is mainly a service function to be used in the case the motion sensing system should fail.

OFF: Dynamic braking is active.

4. TAPE LIFTER DEFEAT

Position ON: The playback tape lifter function is defeated in EDIT WIND mode resulting in constant tape to head contact.

CAUTION: Fast wind with constant head to tape contact will wear out the playback head in a short time.

Position OFF: Tape lifter always lifts the tape at a preset speed.

5. SPEED PRIORITY

Position ON: Low speed priority makes the recorder always select low speed when power is switched on.

OFF: High speed is always selected when power is switched on.

6. FLASHING STOP LIGHT

Position ON: STOP lamp will show a flashing light to indicate that tape is not properly loaded and tape tension is not activated.

OFF: STOP lamp will always show steady light.

Switches 7 and 8 are not used.

7. WIND SPEED SETTING

Located on pcb EDIT WIND LOGIC is a switch that allows the user to set the maximum WIND/REWIND speed to either 500 or 300 ips.

6. OPTIONS and ACCESSORIES

6.1 VU-METER BRIDGE, TYPE TR55/AM77 #414010

The VU-meter bridge enables the user of the TR55 recorder to;

- Monitor on VU-meters and adjust the input and output levels to/from tape.

- Select and adjust variable tape speed

- Record indication.

Note that controls/indicators for channel 2 are omitted in mono versions.

METERS: PRE/POST select whether VU-meter are connected to recordside (PRE) or playback-side (POST). In PRE the meters indicate the level sent to tape, in POST the level sent to the output connector.

REC: Indicates if recording is active on that channel.

LEVEL: The CAL/VAR switches select, independent for the two channels, if the INPUT/OUTPUT LEVEL controls are active. In CAL, the input/output relations are as set up by the internal adjustment of the amplifier; in VAR the controls determine INPUT and OUTPUT LEVEL, with a range of approx. +10 dB to -50 dB referred to CAL position.

TAPE SPEED: The CAL/VAR switches select whether tape speed is controlled by the internal adjustment (CAL) or controlled by the two adjustments COARSE and FINE (VAR). In VAR the red LED gives a warning that an abnormal situation exists. The adjustment range is from approx. half to double the selected nominal speed, and the exact speed may be checked by the built-in speed display function of the tape deck.

6.1.1 INSTALLATION PROCEDURE FOR VU-METER BRIDGE, TYPE TR55/AM77

1. Remove the four distance-pieces, 1 on fig. 1, accessing the screws with a 4 mm Allen key through the holes 2 on fig. 1.

2. Screw the distance-pieces on the rear of the tape deck.

3. Mount the meter bridge onto the distance-pieces.

4. Connect the plug emerging from the bridge.

5. Substitute the amplifiers installed with the ones following the VU-meter bridge, using the original equalizer plug-in prints.

6. Go through the adjustment procedure.

NOTE: The recorder will neither record nor playback if the cable is not connected.

6.1.2 ADJUSTMENT PROCEDURE FOR VU-METER BRIDGE, TYPE TR55/AM77

NOTE: All adjustments should take place with LEVEL-switches in CALibrated position.

1. Since the AM77-amplifier has been modified for VU meter operation, it is necessary to go through the normal adjustment of AM77.

2. To adjust the VU-meters, remove the rear-plate of the box.

3. Adjust the meters to 0 reading with the disired level in (and out) using the potentiometer on the board attached to the meter. The left potentiometer sets the deflection with METER switch in position PRE, the right one sets meter deflection in

position POST.

4. Reinstall the rear-plate, and the adjustment is completed.

6.1.3 DESCRIPTION OF CHANGES TO THE AM77 AMPLIFIER WHEN USED WITH VU METER BRIDGE.

The following changes have been made on the AM77-amplifier to enable the use of the variable gain in the VU-meter bridge, refer to drawing no. 1990, RECORD-PLAYBACK AMPLIFIER AM77.

1. The record signal chain has been interrupted between the output of IC1 (pin 6) and the input of the two record equalisers pin

4.

2. The IC1 pin 6 output has been routed to the edge connector pin A13. The input to the two record equalisers is taken from the edge connector pin B13.

3. The gain of the record chain is increased by 16 dB by changing R2 to 4.7 kOhm and R53 to 10 kOhm.

4. The playback signal chain has been interrupted between the junction of transistor TS20-22-24 and the junction of C55-R102.

5. The junction of TS20-22-24 is routed to the edge connector pin B10.

6. The gain of the playback chain is increased 10 dB by changing R115 to 3.01 kOhm.

6.2 BLANK PANEL #414003 The blank panel is an empty box (identical in size to the VU meter panel) that allows the user to customize his own accessories.

6.3 CINE CENTER REEL ADAPTER #410023 A snap lock adapter for use with 1/4" plastic reels.

6.4 DIN - AEG CENTER REEL ADAPTER #410024 A snap lock adapter for AEG type hubs. Supplied with a 300 mm platter.

6.5 NAB CENTER REEL ADAPTER #410022 An all metal NAB type reel adapter.

6.6 NAB CENTER REEL ADAPTER #962211 Adapter to be used together with #410023.

6.7 SLAVE TIMER DISPLAY #414510 Timer display for panel mounting. Supplied with bezel and 10 meter cable. See drawing 9716

6.8 TAPE DECK REMOTE CONTROL #414501 A parallell wired remote control for panel mounting. Supplied with

10 meter cable. See drawing ....

7. ADJUSTMENTS

AM77 AUDIO AMPLIFIER ADJUSTMENT PROCEDURE

The adjustment procedure to be described allows the user to adjust the AM77 RECORD/PLAYBACK AMPLIFIERS so that the frequency versus amplitude record/playback response of the machine is within specification. Because the machine is adaptable to any reasonable standard no specifec TEST TAPE LEVEL (TTL) or STUDIO LINE LEVEL (SLL) will be defined. In each particular case the user may substitue these terms for his own working levels, and the actual levels in each machine are stated in the test report. The adjustment will only be described for one speed (15 ips) since the procedure is identical for the two speeds. It is assumed that the heads have been demagnetized and adjusted for correct azimuth.

7.1 PLAYBACK (REPRO) LEVEL ADJUSTMENT

1. Load test tape. Connect voltmeter to LINE OUT of channel to be adjusted.

2. Go to START at the level adjust section of the test tape.

3. Adjust P1, LEVEL, of the proper REPRO-playback equalizer to SLL +/- the correction found in table below.

Test Tape Magnetization (nWb/m)

| 185 | 200 | 250 | 320 |

-------+------+--------+-------+-----| 185 | 0 | +0.7 | +1.4 | +4.8|

-------+------+--------+-------+-----| Desired 200 | -0,7 | 0 | +1.9 | +4.1| Magnetization -------+------+--------+-------+-----| at SLL (nWb/m) 250 | -1.4 | -1.9 | 0 | +2.1|

-------+------+--------+-------+-----| 320 | -4.8 | -4.1 | -2.1 | 0 |

-------+------+--------+-------+-----| 510 | -8.8 | -8.1 | -6.2 | -4 |

-------------------------------------+

Correction in dB from Studio Line Level to Test Tape Level.

7.2 AUDIO AMPLIFIER BLOCK DIAGRAM

7.3 PLAYBACK FREQUENCY RESPONSE ADJUSTMENT

4. Go to the frequency response section of the test tape. Select START.

5. Note the level of the 1 kHz tone. Normally 10 or 20 dB below TTL level.

6. Adjust P2, uSec, so that the 6 kHz tone is equal in level to the 1 kHz tone. (At 30 ips: 10 kHz, at 7 1/2 ips: 6 kHz.)

7. Adjust P4, MED-HIGH FREQ, so that the 12 kHz tone is equal in level to the 1 kHz tone. (At 30 ips: 16 kHz, at 7 1/2 ips: 12 kHz.)

8. Adjust P5, HIGH-FREQ, so that the 18 kHz tone is equal in level to the 1 kHz tone. (At 30 ips: 18 kHz, at 7 1/2 ips: 16 kHz).

+================================================================+ | WARNING!! Do not turn P5 up too high as this in some cases can | | make the amplifier go into oscillation. |

+================================================================+

Due to mutual dependence to these adjustments, points 5-8 should be repeated as many times as necessary to obtain a flat frequency response. At last check points 2 and 3 and if necessary, readjust.

7.3.1 SYNC ADJUSTMENTS

Sync frequency response adjustments are identical to REPRO adjustments, but the signal should be taken from the AUX SYNC outlet.

Note: Do not try to adjust P3, LOW FREQ, with test tape. Since the test tape (normally) is full-track recorded, it will cause too high levels at low frequencies due to the fringing effect.

7.4 BIAS ADJUSTMENT

1. Place blank reel of tape (of type that will be used normally) on the machine. Select RECORD, without LINE IN signal.

2. Connect voltmeter (response over 200 kHz) to BIAS/RECORD CURRENT test point. Adjust BIAS RESONANCE for maximum reading.

3. Turn P1, BIAS CURRENT, for channel and speed under test fully counter clockwise.

4. Connect the voltmeter to LINE OUT. Feed a 10 kHz signal approx 20 dB below SLL to LINE IN (At 30 ips: 20 kHz, at 7^ ips: 5 kHz).

5. Slowly turn the BIAS CURRENT potentiometer, P1, clockwise and watch the LINE OUT level rise to a maximum value, after which it will drop with increasing bias current. Continue until this drop (due to selferasing) is approx 3 dB in relation to the maximum value.

Normally bias current is 4-6 mA, corresponding to 40-60 mV across the internal 10 ohm resistor at test jack.

Note: For optimum result this 3 dB "overbias" may vary according to the type of tape used. If in doubt, refer to the tape manufacturers specifications.

7.5 RECORD LEVEL ADJUSTMENT

1. Still with the blank tape and recording on the channel under adjustment, feed 1 kHz at SLL to LINE IN.

2. With voltmeter at LINE OUT, adjust P2, RECORD LEVEL, to read SLL on the voltmeter.

7.6 RECORD - PLAYBACK FREQUENCY RESPONSE

3. Feed 1 kHz, at -20 dB (below SLL), to LINE IN. Note the LINE OUT level.

4. Feed 12 kHz, same level, to LINE IN. Adjust P3, MED-HIGH FREQ

to obtain the same level at LINE OUT as at 1 kHz.

5. Feed 18 kHz, same level, to LINE IN. Adjust P4, HIGH FREQ to obtain the same level -1 dB at LINE OUT as at 1 KHz.

Repeat 4 and 5 due to mutual dependence until a flat frequency response is obtained.

6. At the same level, vary the signal frequency between 30 and 200 Hz while monitoring LINE OUT. Adjust P3, LOW FREQ on the PLAYBACK EQUALIZER to obtain the most satisfying result.

7. Rewind the piece of tape recorded at point 6, select START and monitor AUX SYNC and adjust P3 in the SYNC PLAYBACK EQ in the same manner.

7.7 PHASE SHIFT ADJUSTMENT

Feed a 3 kHz SQUAREWAVE at approx -6 dB (below SSL) to LINE IN. Monitor LINE OUT with an oscilloscope and adjust P5, PHASE SHIFT, to obtain the best squarewave response.

undercompensated correct overcompensated

NOTE: If the azimuth of the record head is adjusted by recording and playing back instead of playing back a testtape in SYNC mode, the PHASE SHIFT should be turned fully clockwise on the tracks used for this purpose, in order to get correct azimuth.

7.8 ERASE ADJUSTMENT

1. With the blank tape, select RECORD.

2. Connect voltmeter to ERASE CURR TEST POINT and adjust ERASE RESONANCE to maximum reading.

3A. If a selective voltmeter is available, then record a piece of tape with 1 kHz, at SLL + 6 dB. Rewind, go to RECORD again and measure with the selective voltmeter set to 1 KHz at LINE OUT. Adjust ERASE CURRENT until specification is met.

3B. If a selective voltmeter is not available, then set ERASE CURRENT to the value stated in the test report (measuring 1 mV per mA across the internal 1 ohm resistor at test jack).

7.9 BIAS TRAPS AND DC CURRENT ADJUSTMENTS

These adjustments are not accessible from front and the AM77 amplifier must therefore be connected via the extension cable when adjustment is carried out. On the other hand, they are not part of any routine check, and readjustment is only necessary when components close related to the adjustable components hae been

substituted.

7.9.1 OUTPUT AMPLIFIER DC-CURRENT

A) Select STOP. No signal at LINE INPUT. B) Connect voltmeter across resistor R137 (15 ohm) in series with the output transistors. C) Adjust P2 for a reading of 250 mV, corresponding to 17 mA idle current.

7.9.2 OUTPUT AMPLIFIER BIAS TRAP

A) Select RECORD, NO LINE IN signal. B) Connect oscilloscope to output of output amplifier (pin A14). C) Adjust coil L7 for minimum bias leakage.

7.9.3 PLAYBACK PREAMPLIFIER BIAS TRAP

A) Select RECORD, NO LINE IN signal. B) Connect oscilloscope to pin 4 on one of the PLAYBACK EQUALIZER print connectors. C) Adjust coil L6 for minimum bias leakage.

7.9.4 SYNC PREAMPLIFIER BIAS TRAP

Is factory adjusted, cannot be readjusted in the recorder.

7.9.5 RECORD AMPLIFIER BIAS TRAP

A) Select RECORD, NO LINE IN signal. B) Connect oscilloscope to either end of C39/C40 (220/uF). C) Adjust coil L2 for minimum bias leakage.

7.10 BIAS TRAPS, LOCATION

7.11 TAPE TENSION SERVO SENSOR DRAWING 1060 PCB 83-07X PCB 83-08X

1 - 816552 Excentric diaphragm disc mounted on tension arm. 2 - 410041 PCB 83-07X with infrared LED and 3 - PCB 83-08X with: 4 - 915421 Infrared servo detector. 5 - 915421 Infrared reference detector.

The servo sensor translates the movements of the tape tension servo arm into a voltage by detecting the amount of infrared light passing the diaphragm which is moving with the servo arm. The intensity from the LED light source is kept independent of variations in temperature by controlling it from an additional sensor not being covered by the diaphragm.

In both supply and take-up side, movement of the tension arm away from rest position, corresponds to a decrease in output voltage, therefore this movement should bring a more transparent part of the disc between the LED and the servo detector.

7.11.1 ADJUSTMENTS - SUPPLY SIDE

Turn mains power off and open the audio compartment and pull out the front drawer until it locks.

Put the machine into the upright position and locate the supply "SERVO OPTO AMPLIFIER.

Turn mains power ON and push the EDIT button once.

Connect a digital voltmeter to 0 volt (black wire) and testpoint TP2 (brown/black wire).

Set potentiometers P1 and P2 to midposition.

Loosen the center screw and turn the excentric diaphragm until the major part of it is turning downward and the voltmeter reads approx. -13 volt.

Turn the diaphragm CCW (counter clockwise) until the voltmeter reads maximum positive voltage (typically 1 to 10 volts). Now turn back a little CW (clockwise) until the voltage drops approx. 2 volts (typical reading is approx. 3 volts).

Tighten the center screw while maintaining the meter reading.

WARNING IT IS VERY IMPORTANT THAT THE DIAPHRAGM

DOES NOT TOUCH ANY PART OF THE SENSOR ASSEMBLY ANY ADDED FRICTION WILL WILL AFFECT THE SERVO SYSTEM

Adjust P1, OFFSET, and P2, GAIN, to get +10 V with arm in rest position and -10 V with arm in fully drawn position.

The adjustment has to be done several times until the reading is exactly as indicated.

Remove the protective cover over the supply servo arm. Attach a spring balance (0-100 g). Measure the servo arm spring tension in rest and drawn position. If necessary adjust the spring associated to the servo system below the tape deck.

After adjustment, lock the center screw with Lock-Tite or nail polish.

7.11.2 ADJUSTMENTS - TAKE UP SIDE

Locate the take up "SERVO OPTO AMPLIFIER.

Connect a digital voltmeter to 0 volt (black wire) and testpoint TP2 (red/black wire).

Set potentiometers P1 and P2 to midposition.

Loosen the center screw and turn the excentric diaphragm until the major part of it is turning downward and the voltmeter reads approx. -13 volt.

Turn the diaphragm CW (clockwise) until the voltmeter reads maximum positive voltage (typically 1 to 10 volts). Now turn back a little CCW (counter clockwise) until the voltage drops approx. 2 volts (typical reading is approx. 3 volts).

Tighten the center screw while maintaining the meter reading.

WARNING IT IS VERY IMPORTANT THAT THE DIAPHRAGM DOES NOT TOUCH ANY PART OF THE SENSOR ASSEMBLY ANY ADDED FRICTION WILL WILL AFFECT THE SERVO SYSTEM

Adjust P1, OFFSET, and P2, GAIN, to get +10 V with arm in rest position and -10 V with arm in fully drawn position.

The adjustment has to be done several times until the reading is exactly as indicated.

Remove the protective cover over the take up servo arm. Attach a spring balance (0-100 g). Measure the servo arm spring tension in rest and drawn position. If necessary adjust the spring associated

to the servo system below the tape deck.

After adjustment, lock the center screw with Lock-Tite or nail polish.

Tilt the machine back to its normal position. Keep the drawer open and locate the "SERVO LIMIT DETECTOR".

Turn P1 fully CCW, then slowly CW until LED 1 lights fully up, then 1/8 turn more CW.

To check adjustment, press in ONE of the two servo arms about 3 mm while observing that LED 1 goes OFF. If not, re-adjust P1.

Press the STOP button once. Turn P2 fully CCW. While pressing BOTH servo arms 2/3 (this has to be done very accurately) of the way in slowly adjust P2 CW until LED 2 lights up.

Load tape and check the tape load and tape end funtions by;

a/ Slowly stretch the tape until the servo arms are 2/3 of the way in. Check that LED 1 goes off and LED 2 goes on.

b/ Wind the tape until it runs out. At tape end check that LED 1 goes off and that the reel motors are turned off.

Check that the output is 0 V when the tension arm is in centre position or slightly towards restposition. If not, repeat the adjustment procedure at another position with the disc turned a few degrees.

NOTE: It is of vital importance that the servo sensor is adjusted correctly. The output from supply and take-up sensor must be equal to avoid creeping effects in stop mode. Mis-adjustment will not only affect tape tension, but also tape end stop and other functions.

7.12 SERVO LIMIT DETECTOR Print 81-01X Diagram 9737

7.12.1 P1, TAPE END STOP ADJUSTMENT.

Tape end sensing comes from measuring the added output from supply and take up servo sensors.

The correct point for triggering the tape end stop is approx. 1 mm before the last servo arm reaches its rest position.

If any adjustments have been done to the servo sensing opto system, also the tape end sensor might need to be readjusted.

Adjustment is done in EDIT-WIND mode and speed set to stand still.

With one hand on the edge of each reel, turn both reels slightly to decrease tape tension. Adjust P1 so that tape tension disappears when the last servo arm is approx. 1 mm from its rest position.

7.12.2 P2, TAPE LOAD ADJUSTMENT.

With tape in STOP mode without tape tension, manually stretch the tape so that both servo arms leave their rest positions and adjust P2 so that tape tension is activated and pinch roller goes to stand-by position.

Remember to have DIL-switch no. 2 in ON position for this ad justment.

LED INDICATORS.

LED 1: Tape end stop indicator LED 2: Pinch roller offset indicator.

7.12.3 ELAPSED TIME COUNTER

The elapsed time counter also found on the servo limit detector pcb. The counter has a full scale deflection of 10.000 hours.

The elapsed time counter is an electro chemical device with a small dot moving from left to right. Full scale deflection is factory set to 10.000 hours. When the time indicator dot reaches its end, the whole indicator can be taken out, turned around and remounted.

NOTE: If the indicator dot is allowed to disappear into the right end, the counter is ruined and has to be replaced.

The elapsed timecounter is active in PLAY and RECORD, and in WIND mode when the tape touches the playback head.

The full scale deflection is set by R34. If other time intervals are required, the value of R34 can be changed.

7.? REEL MOTOR CONTROL AMPLIFIER Print 79-06X Diagram 9597

Two identical reel motor control amplifiers feed the supply and take-up motors with power. The two amplifiers are identical and can be interchanged with each other. They are located on the rear panel.

The amplifier is of a push-pull type and can supply max. 5 A output. The output is linear to the voltage at the control input. I.e. 1 V input corresponds to 1 A output etc. except at high positive input (over approx. 3V), where the gain will increase.

The amplifier has two adjustment trimmers, both located at the connector edge. To get access for service, open the drawer containing the tape deck logic and unfold the hinged audio amplifiers.

Note that supply and take-up amplifier are mounted 180 degrees in relation to each other.

To completely remove the reel motor control amplifier, loosen the two screws on the back panel, which holds the heat-sink. Pull the heat-sink out together with the amplifier print.

7.?.1 ADJUSTMENTS

P1: DC-OFFSET. P1 is factory set to leave the motor in stop when tape is not loaded. A quick control of the DC-offset can be done by pressing the illuminated speed selector button (this will release the parking brake). If any of the motors now show any tendency to move, P1 needs adjustment.

Disconnect the motor connector. Measure the voltage over pins 16 and 17, and adjust P1 for a reading as close as possible to 0 V.

P2: POWER SWITCHING. To avoid excessive heat being produced in the power supply, the reel motor control amplifier operates on either high or low voltage.

In the amplifier, a sensing circuit (T9 - T12) sends a command to the power supply to order the high voltage when needed. When the high voltage is switched on, the LED's on the power terminal board are illuminated.

For operating situations like stand-by, play and record, the low voltage is used.

During dynamic braking, accelerating and fast winding the high voltage is switched on.

ADJUSTMENT TAKE-UP SIDE

Load the recorder with a full reel on the take-up side. With the recorder in play mode at the high speed, observe the right LED. Adjust P2 so that the LED is just about to light up. Check by manually braking the supply reel very slightly. This should cause the LED to light up.

ADJUSTMENT SUPPLY SIDE

Load the recorder with a full reel on the supply side. With the recorder in play mode at the high speed, observe the left LED. Adjust P2 so that the LED is just about to light up. Check by manually braking the supply reel very slightly. This should cause the LED to light up.

7.? SERVO MIX AMPLIFIER Print 80-163 Diagram 9674

LED's illuminated in different modes

+-----------------------------------------------------------------+ |MODE | LED NO. | REMARKS | |-------------------------+-----------+---------------------------| |NO LOAD | 1 | 2 | 3 | Tape tension not activated| |EDIT | 1 | 2 | 3 | Tape tension not activated| |STOP LOAD | 1 | | | Tape tension activated | |DUMP MODE (EDIT + START) | | | 3 | Take-up motor passive | |START | | | | Nominal speed | |RECORD | | | | Nominal speed | |WIND/REWIND | | | | Full wind speed | |EDIT WIND | | | | Variable wind speed | |ANTI DUMPMODE | | 2 | | Supply motor passive | |ANTI DUMPMODE + DUMPMODE | | 2 | 3 | Both reel motors passive | +-----------------------------------------------------------------+

7.? EDIT AND START ENABLE Print 80-10X Diagram 9665

LED INDICATORS

LED 1: Pinch roller attack (Start - Record)

LED 2: Mechanical brakes in released position.

7.? REEL MOTOR COMMANDER Print 80-08X Diagram 9666

LED INDICATORS

LED 1: Rewind command or brake command for supply motor.

LED 2: Wind command or brake command for take up motor.

LED 3: Tape action (Play - Rec - Wind - Dynamic brake).

7.? TAPE MOTION SENSOR Print 80-17X Diagram 9900

7.?.1 TAPE LIFT SPEED SETTING

P1: Speed sensor for tape lift in wind mode, adjusted to activate tape lifter at double high speed, i.e. approx. 60 ips.

LED INDICATORS

LED 1: LED for tape lift activity.

LED 2: LED for tape load (active stand-by).

A: Test point for tacho input pulses.

7.? CAPSTAN SPEED DETECTOR Print 80-17X Diagram 9675

NOMINAL SPEED ADJUSTMENT

P1 : High speed adjustment.

P2 : Low speed adjustment.

Nominal tape speed is set by holding down the illuminated speed selector and adjust for correct reading in ips in the display.

7.? CAPSTAN DRIVER AMPLIFIER Print 80-18X Diagram 9676

P1: Servo loop gain, adjusted for minimum wow and flutter at low tape speed.

7.? CAPSTAN OUTPUT AMPLIFIER Print 80-19X Diagram 9759 start ramp ? ramp attack ?

7.? HEADPHONE AND SPEAKER AMPLIFIER Print 82-17X Diagram 9953

The headphone output is driven by two identical monitor amplifiers. With potentiometer P1, the level can be adjusted to suIt the sensitivity of the headphones.

With the front panel volume control....

7.? PINCHROLLER DRIVER Print 81-16X 81-18X Diagram 9789

7.?.1 THEORY OF OPERATION

The eletronically controlled pinchroller solenoid is equipped with a position sensor in the form of a differential transformer L1. The ferrite core of the transformer is mechanically connected to the solenoid shaft.

A wien bridge generator supplies 225 kHz 8 Vpp to the transformer system. The output from the transformer is routed through a buffer stage (T1), and is then rectified (D3). The second buffer (T4) supplies a DC voltage that is proportional to the position of the solenoid shaft. The voltage at the emitter of T4 is approx. 10 V in the rest position and approx. 14 V in top position.

IC1 (8.9.10.) compares the position information with the charge condition of C6.

When 24 V is applied to the ATTACK input, IC1 (12.13.14) will charge C6 through R5. If the voltage on C6 is higher than the position information, the comparator will switch on transistor T5 and T6 in order to move the solenoid shaft to the corresponding position. The speed of the movement is set by the resistor R5.

When 24 V is applied to the OFFSET input, the signal is attenuated through potentiometer P1 and C6 will be charged to a level corresponding to the setting of P1. This is used to create the active stand-by position, where the pinchroller is parked very close to the capstan shaft, and very fast starting times can be achieved.

The capstan command output will activate the capstan motor when the pinch roller has reached correct position. The pinchroller position is constantly sensed and the capstan command point is

adjusted with P2.

The wien bridge generator is mounted on the pinchroller driver print. The generator supplies 225 kHz 8 Vpp and this signal is routed to all three solenoid drivers.

The enable output is a circuit that secures that the output stages to the solenoid coils are inoperative during power on and off sequences.

Capacitor C13 is charged through R32 when power is switched on. In approx. 3 seconds the base of T9 will rise to 1,2 V and activate T10 to drain the enable output.

At power off, the 24 V will start to drop and after a few volts start discharging C13 through D4 and R 35 and quickly cut off T9 and T10.

7.?.2 PINCHROLLER DRIVER ADJUSTMENTS

P1, OFFSET

The stand-by position of the pinch roller is adjusted with the offset potentiometer P1.

With the recorder in STOP mode, i.e. with tape tension, adjust P1 so that the pinchroller stays 3 mm from the capstan shaft.

P2, CAPSTAN COMMAND

The moment that the capstan motor is started is adjusted with the capstan command potentiometer P2.

Insert a 1,5 mm plate in the travel path of the pinch roller solenoid shaft. Connect a DC voltmeter to the capstan command output. This point is easiest found at the end of resistor R19, located next to P2.

Press START to activate the solenoid, which will now travel to its end position less 1,5 mm. Adjust P2 for reading of +20 V on the voltmeter.

NOTE: Make sure that stand-by position and capstan command position are not too close to each other and that NO OVERLAPPING OCCUR. If this happens it will be impossible to enter WIND mode from START and activate stand-by.

7.? TAPE LIFT DRIVER Print 81-15X Diagram 9788

The two tape lift drivers that lifts the tape from the erase/record and the playback head are in design closely related to the pinch roller driver.

There are however some differences.

- The tape lift drivers are mounted 180 degrees in relation to the pinch roller driver.

- The tape lift drivers are not equipped with a HF generator. The HF generator mounted on the pinch roller driver feeds all three solenoid drivers.

- A different set of trimmers are used for the tape lift adjustments.

THEORY OF OPERATION

The electronically controlled tape lifter solenoid is equipped with a position sensor in the form of a differential transformer, L1. The ferrite core of the transformer is mechanically connected to the solenoid shaft.

HF (225 kHz, 8 Vpp) is routed from the generator mounted on the pinch roller driver to the HF input.

The HF is amplified in IC 1 (5.6.7) and injected to the primary coil of L1. The output from the transformer is routed through a buffer stage (T1) and is then rectified (D3) and filtered (C4). The second buffer (T4) supplies a DC voltage that is proportional to the position of the solenoid shaft. The voltage at the emitter of T4 is approx. 10 V in rest position and approx. 14 V in top position.

IC1 (8.9.10) compares the position information with the charge condition of C6.

When 24V is applied to the ATTACK input, IC1 (12.13.14), the signal is first attenuated through potentiometer P1 and C6 will be charged to a level corresponding to the setting of P1.

If the voltage on C6 is higher than the position information, the comparator will switch on transistors T5 and T6 in order to move the solenoid shaft to the corresponding position. The speed of the movement is set by potentiometer P4.

The enable circuit is controlled from the pinch roller driver and ensures that the output stages to the solenoid coils are inoperative during power on and off sequences.

7. ADJUSTMENTS

The tape lift driver has four adjustment points.

P1, MAX TRAVEL

With P1 the lifting height is adjusted.

Do not adjust to max. tape lift as this will affect the response of the release speed. Max. setting is 1 mm from top position.

P2, OFFSET.

This adjustment is intended for future features. The potentiometer is normally not mounted.

P3, RELEASE

With P3 the release speed can be adjusted for a smooth and silent operation. On the playhead lifter P3 is factory set and the potentiometer normally replaced by a 10 kohm resistor.

On the erase/record head lifter P3 is set so that it corresponds with the attack speed of the playhead lifter.

P4, ATTACK

With P4 the attack speed can be adjusted for a smooth and silent

operation. On the playhead lifter P4 is factory set and the potentiometer normally replaced by a 10 kohm resistor.

On the erase/record head lifter P4 is set so that it corresponds with the release speed of the playhead lifter.

7. COUNTER OPTO AMPLIFIER Print 79-083 Diagram 9599 ADJUSTMENTS

Check that the counter tacho disc is in good condition and that the edge is not worn.

Connect a double beam oscilloscope to the output test point (found as two soldering tags on the solder side of the prints.)

Each output shall have a mark/space ratio of 1:1 +/- 10%. This is factory-adjusted by selecting values for R3 and R11.

The two outputs must be offset by 90 degrees. This is adjusted by loosening the two screws that holds the print to the tape deck and moving the print very little. While moving the print (in play mode at 15 ips) watch the offset on the oscilloscope.

Depending on which phase comes first, the counter will count correct or reversed.

If a position is found where the counter works properly but counting in reverse direction, the yellow and orange wires should change position. The wires can be taken out of the connector without soldering.

When phase has been adjusted to 90 degrees offset, go to WIND mode and check that offset is still 90 degrees. If not, readjust at play speed.

Make sure the protective cover over the tacho disc is mounted so that the ribbon cables from the terminal print do not touch the disc when the recorder is closed.

NOTE: The mechanical distance between the two photo interruptors has an influence on the phase offset. When a photo interruptor has been replaced it might be necessary to press them more together or separate them slightly with a screwdriver.

CORRECT OFFSET

7.25 REEL MOTOR BRAKE ADJUSTMENT

The mechanical brakes are only active in UNLOAD mode (tape tension off) and as emergency brake at power failure.

1. Disconnect the reelmotor from its related Reel Motor Control Amplifier.

2. On the reelplatform, unscrew the centre hex screw completely. By hand disengage the brake solenoid and slowly raise and remove the complete reelplatform.

3. Unscrew the four hex screws securing the reelmotor assembly to the tape deck. By hand support the motor from below to prevent it from falling down.

4. Remove the reel motor assembly (c) from the tape deck.

5. By loosening the two scews (a) securing the solenoid assembly (b) to the reel motor assembly (c), the brake band can now be adjusted. Adjustment is done by moving the solenoid assembly (b) away from or towards the brake drum (e).

6. Manually engage and hold the solenoid. Move the solenoid assembly (b) towards the brake drum housing just until the brake band touches the inner walls (f). Now tighten the two screws (a).

7. While solenoid is engaged, re install the reel platform. Release the solenoid and check operation of brake by turning the reel platform. Note that the brake effect is selective to the rotation direction.

8. Re install the reel motor assembly and connect the Reel Motor Control Amplifier.

Drawing # ????

L Y R E C S E R I E S T R 5 5 +++++++++++++++++++++++++++++++++

S P A R E P A R T S +++++++++++++++++++++

PART NO PART DESCRIPTION

-----------------------------------------------------------------

VU-METER PANEL ++++++++++++++

960701 VU-meter AL 22 F 961731 VU-meter lamp, 24 V, 1,2 W

915111 LED, record indication, NSL-5026 903164 10K Lin, potentiometer, varispeed

903167 22K Log, potentiometer, level

TAPE DECK +++++++++

410031 Pinchroller 1/4" 501031 Pinchroller 1/2"

880411 Top cover for pinchroller 896001 Base plate for tape tension arm, supply

896002 Base plate for tape tension arm, take-up 896011 Cover for tape tension arm, supply 1/4"

899151 Cover for tape tension arm, supply 1/2" 896012 Cover for tape tension arm, take-up 1/4"

899152 Cover for tape tension arm, take-up 1/2" 960101 Brake solenoid

926201 Reel motor 894911 Brakedrum

970611 Spring washer 895921 Brakeband

896891 Brake spring 501121 Capstan motor cpl with strobodisc and preamp

877761 Pullspring for pinchroller

501032 Returnspring for pinchroller 897851 Tape lifter return spring

410036 Solenoid 40 mm, without driver pcb 501033 Tape tension servo arm, supply 1/4"

501035 Tape tension servo arm, supply 1/2" 501034 Tape tension servo arm, take-up 1/4"

501036 Tape tension servo arm, take-up 1/2"

501037 Tape tension servo spring

816552 Excentric servo disc 810592 Tape guide roller .15"

892281 Tape guide roller 1/4" 899161 Tape guide roller 1/2"

892451 Top cover for tape guide roller 1/4" 899171 Top cover for tape guide roller 1/2"

892442 Base plate for tape guide roller, supply

892441 Base plate for tape guide roller, take-up 899262 Tape timer strobo disc 64:1

897732 Sidepanel supply side 897731 Sidepanel, take-up side

410022 NAB reel adaptor complete 0.15" (QC) 501122 NAB reel adaptor complete 1/4"-1/2"

887631 NAB adaptor positioning spring

880261 NAB adaptor pressure spring 410024 DIN reel adaptor complete with 300 mm plate

893521 DIN adaptor pressure spring 410023 CINE reel adaptor complete

898871 CINE adaptor pressure spring 501040 Tape cutter blade, fixed

501041 Tape cutter blade, moving 896921 Spring for tape cutter

897561 Return spring for tape cutter 897521 Edit wind speed lever

TAPE DECK ELECTRONIC PARTS ++++++++++++++++++++++++++

410026 Capstan pre-amplifier PCB 83-141 410041 Servo opto amplifier PCB 83-073

410046 Counter opto amplifier PCB 79-083 410050 Tape deck terminal print PCB 79-173

410037 Pinchroller solenoid driver PCB 81-181/161 410038 Tape lift solenoid driver PCB 81-153

411020 Tape timer display PCB 78-001 411030 Motherboard 1/4"-1/2" PCB 80-063

411501 Tacho logic PCB 80-001 411502 Push button amplifier PCB 78-011

411503 Diode matrix PCB 80-075 411504 Edit and start enable PCB 80-102

411505 Reel motor commander PCB 80-081 411506 Tape motion sensor PCB 80-096

411507 Capstan start time sensor PCB 80-203 411508 Edit wind logic PCB 80-115

411509 Servo limit detector PCB 81-012 411510 Tape lift and cut logic PCB 80-142

411511 Tape end motor brake PCB 80-151 411512 Servo mix amplifier PCB 80-163

411513 Capstan speed detector PCB 80-172

411514 Capstan driver amplifier PCB 80-182 411515 Capstan output amplifier PCB 80-193

411516 Monitor amplifier stereo PCB 82-170 410530 PSU regulator module PCB 79-183

410021 Reel motor control PCB 79-063 410540 PSU terminal print PCB 79-193

410510 Mains transformer assy complete

HEADS +++++

MONO FULL TRACK: 924203 Erase head full track 924204 Record head fulltrack 924205 Playback head full track

STEREO, 0,75 MM SEPARATION: 924203 Erase head full track 924202 Record head stereo 924201 Playback head stereo

2-TRACK, 2 mm SEPARATION: 924208 Erase head 2-track 924206 Record head 2-track 924207 Playback head 2-track

STEREO 1/2": 924303 Erase head 2-track 1/2" 924304 Record head 2-track 1/2" 924305 Playback head 2-track 1/2"

HEADBLOCK +++++++++

501042 Headblock cover plate 501043 Backcover for headblock 1/4"

501044 Backcover for headblock 1/2" 867831 Flutter idler roller

501045 Flutter idler cpl with holder and bearings 897111 Non rotating tape guide 1/4"

897114 Non rotating tape guide 1/2" 874641 Flange for non rotating tape guide

501046 Headstack mounting plate 6 mmm 869061 Azimuth adjustment screw

869051 Tilt adjustment ballpoint screw

AUDIO SECTION +++++++++++++

412501 AM77 audio amplifier PCB without EQ 412502 Record equalizer PCB

412503 Playback equalizer PCB 412510 Bias oscillator PCB 77-001

927111 Record relay A2625

923102 Line input transformer TD 4016 923122 Line output transformer TD 4012

GENERAL COMPONENTS ++++++++++++++++++

905311 10.000 uF, 40 V Smoothing capacitor

911101 1N4148 Diode 911231 1N5401 Diode

911391 1N821 Diode, zener

911201 PK05F Rectifier bridge 911202 26MB10A Rectifier bridge

912101 BC184 Transistor 912111 BC214 Transistor

912113 2N4403 Transistor 912121 2N2369 Transistor, switch

912203 TIP42A Transistor 912205 TIP120 Transistor

912207 TIP125 Transistor 912211 TIP145 Transistor

912221 TIP641 Transistor 912401 2N1711/BC140 Transistor

912411 2N2905/BC160 Transistor 912421 MJ2955 Transistor

912431 2N3055 Transistor 912511 PN4393/2N4393 Transistor, field effect

912611 TAG 201-400 Triac

913101 TL081 IC opamp 913102 TL071 IC opamp

913103 TL091 IC opamp 913107 TL072 IC opamp

913111 TL084 IC opamp 913116 TBA231 IC opamp

913121 LM301AN IC 913125 LM311 IC

913128 LM318 IC 913141 LM386-N4 IC

913171 ULN2803/L603 IC 913175 UDN2981 IC

913201 LM340 K5/LM309 IC, voltage regulator 913213 LM320LZ-12/uA79M12 IC, voltage regulator

913215 LM320 K15 IC, voltage regulator 913225 LM340 K15 IC, voltage regulator

913233 LM350 IC, voltage regulator

913911 AD7530JN IC, CMOS 914406 4013 IC, CMOS

914416 4040 IC, CMOS 914426 4093 IC, CMOS

914436 4098 IC, CMOS 914451 4520 IC, CMOS

914711 7437 IC, TTL 914716 7473 IC, TTL

914721 7490 IC, TTL 914726 74121 IC, TTL

914751 74LS132 IC, TTL 914753 74LS138 IC, TTL

501047 8748 IC, Programmed 914811 8255A IC

915101 LED 3 mm, red 915121 LD271 LED, infrared

915302 H21A1 Opto coupler 915421 BP104 Photodiode, infrared

915221 MAN6640 Double numeric display

902311 33E Resistor network, 8 separate 902321 1K5 Resistor network, 8 separate

902331 10K Resistor network, 8 separate 902351 22K Resistor network, 15 common

903102 100E Potentiometer, single turn VA05V 903104 220E Potentiometer, single turn VA05V

903111 4K7 Potentiometer, single turn VA05V 903113 10K Potentiometer, single turn VA05V

903115 22K Potentiometer, single turn VA05V 903117 47K Potentiometer, single turn VA05V

903118 100K Potentiometer, single turn VA05V 903123 1M Potentiometer, single turn VA05V

913143 10K Potentiometer, single turn VA05H 903147 47K Potentiometer, single turn VA05H

903207 1K Potentiometer, multiturn 903211 5K Potentiometer, multiturn

903213 10K Potentiometer, multiturn 903215 22K Potentiometer, multiturn

907120 Coil 4.7 mH 898601 Adjustable coil S14, 2.5 mH

898621 Adjustable coil S14, 8 mH 898641 Adjustable coil S14, 13 mH

898581 Ferrite transformer T18 0008 T2, bias 898591 Ferrite transformer T18 0017 T1A, erase

501048 Differential transformer 921111 DIL switch, 8 pole

921125 Toggle switch TT21. 2-pole 921231 Mains switch, 1852.1102

921255 Toggle switch 7201 922211 Pushbutton EAO 01-121

922221 Top cover with engraved legend, white 922222 Top cover with engraved legend, red

927111 A2625, relay 927114 A2420, relay

960301 Elapsed time counter module 961701 Lamp for pushbutton, 36 V, 50 mA

962010 2.000 MHz crystal 962041 6.000 MHz crystal

923205 Mains transformer DK5533B (2 x 12 V) 923206 Mains transformer DK5534 (5, 24, 2 x 15 V)

969047 Service manual TR55 1/4 and 1/2" 969054 Service manual TR55-QC

10. APPLICATION NOTE

10.1 AUTOMATIC SWITCHING TO LINE INPUT IN STOP MODE.

The AM77 audio amplifier used in the TR55 series of recorders is hardwired to playback.

With a simple modification it is possible to have automatic switching to LINE INPUT whenever the machine is not running or REPRO manually selected.

The modification requires two zenerdiodes ZF 6,2 V and ZF 4,7 V and one diode 1N4148 in each amplifier.

Locate diode D30 and replace it with zenerdiode 6,2 V. Locate diode D32 and replace it with zenerdiode 4,7 V. Install a new diode between the LINE command input (edge connector no A11) and the junction of R87/R79/D24. See enclosed extract of diagram 1039/9171.

11

February 1990.

SERVICE BULLETIN

VALID FOR: Lyrec TR55, 1/4" and 1/2" with bias oscillator pcb 77001, with 187.5 kHz bias frequency (6 MHz crystal). Serial nos 8810305 to 8910507.

SYMPTOM: Bias oscillator do not start up properly or starts with wrong frequency at power on.

CAUSE: Missing capacitors on oscillator pcb.

REMEDY: Remove oscillator pcb and inspect soldering side. Two ceramic capacitors should be mounted. If not, install 47 pF and 18 pF as shown.

ooOoo

February 1990.

SERVICE BULLETIN

VALID FOR: Lyrec TR55, 1/4", 1/2" and QC. Serial nos 8910405 to 8910706.

SYMPTOM: Difficulty to enter "Edit wind mode".

CAUSE: Incorrect mounting of 2 components.

REMEDY: Open front drawer containing the tape deck logic and locate the pcb "Edit wind logic" (pcb 80115) at motherboard connector J9.

Locate and swop position of resistor R5 (4k7) and diode D7 (1N4148). Se drawing 9669 for exact location and polarisaton of diode.

ooOoo

1990 12 16 MODIFICATION OF THE TR55 POWER SUPPLY (all versions)

Purpose: To reduce the risk of crosstalk generated in the headphone/speaker amplifier.

Mod. Kit contains:

25 cm. of twisted cable with 1 AMP connector. 70 cm. of twisted cable with 2 AMP connectors. 75 cm. of twisted cable with 1 AMP connector. 4 pcs. of nylon straps and 2 selfaddesive tiepoints.

Mod. procedure:

1. Turn off the power, disconnect the power line.

2. Remove the psu. from the machine by: a: Remove the grid on top of the psu. b: Remove the psu. by loosen and remove the four 4mm. screws securing it. c: Loosen and remove the two 3mm. screws securing the "Remote display and Remote control" connector plate. d: Gently withdraw the psu about 10 cm. e: Disconnect the 40 pole ribbon cable connector from the psu. Furthermore disconnect the two cables comming from the two reel motors connected to the reel motor control amplifiers. f: Now fully remove the psu.

3. From the rear side of the psu locate the three heatsinks in the middle.

4. Remove the three coverplates by pushing them upwards. Locate and unscrew the four 3mm. screws securing the heatsink assembly to the psu. panel.

5. Locate and unscrew the four 4mm. screws securing the transformer assembly to the psu. panel.

6 Now gently "open" the psu. by withdrawing the heatsink and the transformer assembly from the psu. panel.

7. Route the 25cm. cable from the right side of the psu. terminal pcb. containing the 40 pole connector in parallel with the exsisting wiring harness to the pcb. located at the rear side of the heatsink.

8. Solder the new brown wire to the printet circuit at the point where the browm wire is connected.

9. Solder the new black wire to the printed circuit at the point where all the other black wires are connected.

10.Using two nylon straps tie the new cable to the exsisting wiring harness.

11.While paying attention not to damage any cables reassembly the power supply unit.

12.Open the front drawer of the machine using a 3mm. Allen Hex key and lower the Audio compartment. Now tilt the machine by loosen and remove rear bolts securing it to the console (machine stand).

13.At the rear side of the mother board -pcb. 83051 - locate the two twisted wires connected between J25 pin 3/4 and 5/6 to J29 pin 8 and 5/6. Unsolder, remove and discard these two wires.

- They are typically white and blue.

14.Solder the new 75cm. cable at J29, the brown wire at bin 8 and the black wire at bin 5/6.

15.Using the two selfaddeshive tiepoints route the new cable from J29 to the edge of the motherboard next to J25.

16.Reinsert the psu. in the machine remembering to reconnect the two reel motor cables and the 40 pole ribbon cable connector. Mount the grid on the psu.

17.Remount the "Remote" connector plate.

18.Connect the last new cable - 70cm. - between the new cable connector in the psu and at the motherboard.

19.Check once more the machine for any loose parts - now close the front drawer - check the ribbon cables - close the Audio compartment.

20. The modified machine is now ready for test.

TR55 Application note.

Changing excentric servo disk (servo sensor).

1. Check mechanical tension of supply and take up servo springs.

Measure tension with spring balance in vertical position.

TR55-1/4" Rest position 20 g (tape tension 95 g) Max position 40 g TR55-1/2" Rest position 30 g (tape tension 110 g) Max position 50 g TR55-0.15" Rest position 2 g (tape tension 55 g) Max position 50 g

2. Connect voltmeter to TP2 (digital voltmeter recommended).

3. Set P1 and P2 in center position.

4. With servo arm in rest position, loosen screw a little and turn the excentric disk into the optosensor until approx 8 V is reached at TP2 (This should give approx -12 V with arm in top position). Tighten screw.

5. Adjust offset, P1, so that the same numeric voltage is achieved in rest and top position (for example + and - 7 volt).

6. Adjust gain, P2, to expand voltage to +10.0 V in rest position and

-10.0 V in top position.

7. Check that, with arm in middle position, or slightly towards rest position gives 0 V out at TP2.

8. In general, it is more important that supply and take-up side are adjusted to give identical voltages, rather than absolute values.

12. DIAGRAMS

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----------------------------------------------------------------- AUDIO: 1991 Cable scheme 2 channel electronics AM77 w VU bridge A3>A4 2002 Record-Playback amplifier AM77 with Dolby HX Pro A1 2003 Dolby HX Pro circuit A3>A4 1040 Component location for AM77 A2 1070 Record equalizer A3>A4 1038 Repro and Sync Equalizer A4 1452 Headstack connections for 1/2" 4-track version S/S A4 2435 Headstack connections for 1/2" 4-track version INT A4 2599 187.5 kHz crystal generator A4 9953 Headphone and speaker amplifier A3>A4

TAPE DECK LOGIC: 9878 Motherboard and connector location A3>A4 9781 Tachometer logic 1/3 A3>A4 9782 Tachometer logic 2/3 A3>A4 9783 Tachometer logic 3/3 A3>A4 9784 Tachometer logic, component layout A3>A4 9716 Tape timer display connections A4 9674 Servo mixer amplifier A3>A4 1085 Servo mixer amplifier, component layout A4 9673 Tape end motorbrake A3>A4 9672 Tape lift and cut logic A3>A4 9737 Servo limit detector A3>A4 9669 Edit wind logic A3>A4 9668 Capstan start time sensor A3>A4 9900 Tape motion sensor A2 9666 Reel motor commander A3>A4 9665 Edit and Start enable A3>A4 9664 Diode matrix A3>A4 9312 Pushbutton amplifier A4

CAPSTAN MOTOR SYSTEM: 1061 Capstan speed preamplifier A4 9675 Capstan speed detector A3>A4 9676 Capstan driver amplifier A3>A4 9759 Capstan output amplifier A3>A4

BELOW TAPE DECK: 1060 Servo opto amplifier A4 9599 Counter opto amplifier A4 9789 Pinch roller driver A3>A4 9788 Tape lifter driver A3>A4

REAR PANEL: 9757 Power supply A2 9597 Reel motor control A2

ACCESSORIES: 9790 VU meter panel A3>A4 9750 Remote control connections A4

The following pages contain a listing of all connections in tape deck electronics motherboard.

Each connector is labelled with a "J" and a number and the mating printed circuit board or cable is labelled likewise, and for each pin on each connector, the listing informs which connector(s) and pin(s) it is connected to.

On the last page, a listing of all connectors is given, including the name of the connecting part, and the drawing number of the connecting part.

Drawing 9878 shows the positions of the printed circuit boards and connectors on the motherboard.

CONNECTOR J1: CONNECTING TACHOMETER LOGIC AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J12,1 TACHO PULSES OUT 2 J12,2 TACHO PULSES OUT 3 N.C. 4 N.C. 5 N.C 6 N.C. 7 N.C. 8 J3,7-J16,4 SET CUE COMMAND 9 J3,8-J15,4 SET ZERO COMMAND 10 J3,5-J18,4 SEARCH CUE COMMAND 11 J3,6-J17,4 SEARCH ZERO COMMAND 12 J3,12 TACHO PULSES 1 13 J3,13 TACHO PULSES 2 14 J11,2 COUNTER INHIBIT 15 N.C. 16 J13,19-J28,2-J14,42-J33,8 HIGH SPEED LAMP 17 J14,4 SPEED DISPLAY COMMAND 18 J14,3 + AT WIND/REWIND 19 J14,18-J21,6 START LAMP 20 J3,1-J14,26-J22,8 STOP LAMP 21 N.C.

CONNECTOR J2: CONNECTING TACHOMETER LOGIC AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4,1-J4,21 +15 V 2 J4,1-J4,21 +15 V 3 J4,2-J4,22 -15 V 4 J4,2-J4,22 -15 V 5 J4,3-J4,23 +5 V 6 J4,3-J4,23 +5 V 7 J4,3-J4,23 +5 V 8 J4,3-J4,23 +5 V 9 J14,5-J17,3 SEARCH ZERO LAMP OUT 10 J14,6-J18,3 SEARCH CUE LAMP OUT 11 J11,3-J14,25-J22,7 STOP COMMAND OUT 12 J14,19-J21,7 START COMMAND OUT 13 J14,14-J20,7 FORWARD WIND COMMAND OUT 14 J14,10-J19,7 REWIND COMMAND OUT 15 N.C. 16 J9,12 -V REF 17 J9,1 COMPRESSED ANALOGUE SPEED OUT 18 J4,4-J4,24 GROUND 19 J4,4-J4,24 GROUND 20 J4,4-J4,24 GROUND 21 J4,4-J4,24 GROUND

CONNECTOR J3: CONNECTING REMOTE CABLE AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J1,20-J14,26-J22,8 STOP COMMAND/LAMP 2 J13,5-J14,20-J21,8 START COMMAND/LAMP 3 J5,12-J11,6-J12,3-J14,15-J20,8 FORWARD WIND COMMAND/LAMP 4 J5,11-J11,5-J12,4-J14,11-J19,8 REWIND COMMAND/LAMP 5 J1,10-J18,4 SEARCH CUE COMMAND 6 J1,11-J17,4 SEARCH ZERO COMMAND 7 J1,8-J16,4 SET CUE COMMAND 8 J1,9-J15,4 SET ZERO COMMAND 9 J13,7 BREAK 10 J3,27 GROUND 11 J10,1 RECORD INHIBIT 12 J1,12 TACHO PULSES 1 13 J1,13 TACHO PULSES 2 14 J5,7-J13,4 PINCHROLLER ATTACK 15 J8,6 PINCHROLLER OFFSET 16 J7,1-J8,4 PLAYLIFT 17 J7,2-J8,5 ERASE LIFT 18 J10,5-J13,9-J14,30-J23,8 RECORD COMMAND/LAMP 19 J14,29-J23,4 RECORD BUTTON DEPRESSED 20 J7,6-J8,8-J9,6-J10,7-J13,10-J14,34-J24,3-DIL4 EDIT COMMAND/LAMP 21 J25,20-J27,8 VARISPEED 22 J27,7 CAPSTAN SYNC 23 J25,13 HARDWARE 24 N.C. +24 V 25 N.C. +15 V 26 N.C. +5 V 27 J3,10 GROUND 28 N.C. -15 V 29 RESERVED

30 RESERVED 31 N.C. 32 J5,16 PINCHROLLER PLAY POSISITION 33 J5,1-J3,2 SUPPLY SERVO SENSOR 34 J5,2-J8,3-J26,5 TAKE UP SERVO SENSOR

CONNECTOR J4: CONNECTING POWER CABLE AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J2,1-J2,2-J4,21 +15 V FOR TACHOMETER LOGIC 2 J2,3-J2,4-J4,22 -15 V FOR TACHOMETER LOGIC 3 J2,5-J2,6-J2,7-J2,8-J4,23 +5 V FOR TACHOMETER LOGIC 4 J2,18-J2,19-J2,20-J2,21-J4,24 GROUND FOR TACHOMETER LOGIC 5 J4,25 +5 V FOR TAPEDECK AND AUDIO 6 J4,26 +15 V FOR TAPEDECK 7 J4,27-J25,7-J25,17-J29,6-J30,6 GROUND FOR AUDIO 8 J4,28-J25,6-J25,16-J29,8-J30,8 +15 V FOR AUDIO 9 J4,29-J25,5-J25,15-J29,7-J30,7 -15 V FOR AUDIO 10 J4,30 -15 V FOR TAPEDECK 11 J4,31 GROUND FOR TAPEDECK 12 J4,32 +24 V FOR TAPEDECK 13 J4,33-J26,3 EMITTER, CAPSTAN SERIES TRANSISTOR 14 J4,34-J26,2 BASE, CAPSTAN SERIES TRANSISTOR 15 J4,36-J26,1 SENSE RESISTOR, CAPSTAN 16 N.C. 17 J5,5 SUPPLY OUTPUT AMP 18 J5,6 TAKE UP OUTPUT AMP 19 J13,3 BRAKE SOLENOIDS 20 J7,16 CUTTER SENSE 21 SEE PIN 1 22 SEE PIN 2 23 SEE PIN 3 24 SEE PIN 4 25 SEE PIN 5 26 SEE PIN 6 27 SEE PIN 7 28 SEE PIN 8 29 SEE PIN 9 30 SEE PIN 10 31 SEE PIN 11 32 SEE PIN 12 33 SEE PIN 13 34 SEE PIN 14 35 SEE PIN 15 36 J28,9 CAPSTAN PREAMP 1 37 J28,16 CAPSTAN PREAMP 2 38 J6,1 BRAKE COMMAND SUPPLY 39 J6,2 BRAKE COMMAND TAKE UP 40 J5,3-J5,4-J10,2 POWER SELECTOR

CONNECTOR J5: CONNECTING SERVO MIXER AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J3,33-J8,2 SUPPLY SERVO SENSOR 2 J3,34-J8,3-J26,5 TAKE UP SERVO SENSOR 3 J4,40-J5,4-J10,2 POWER SELECTOR 4 J4,40-J5,3-J10,2 POWER SELECTOR 5 J4,17 SUPPLY OUTPUT AMP 6 J4,18 TAKE UP OUTPUT AMP 7 J3,14-J13,4 PINCHROLLER ATTACK 8 J9,4-J14,9 EDIT WIND COMMAND 9 J9,3 REWIND COMPUTE 10 J9,2 WIND COMPUTE 11 J3,4-J11,5-J12,4-J14,11-J19,8 REWIND LAMP 12 J3,3-J11,6-J12,3-J14,15-J20,8 WIND LAMP 13 J10,3 START POWER 14 N.C. 15 J7,7-J10,4-J11,4-J12,5-J26,9 START COMMAND CAPSTAN 16 J3,32 PINCHROLLER POSITION PLAY 17 J6,7-J8,11-J11,8-J13,1-J14,7 TAPE LOAD 18 J6,8-J8,10-J12,9-J13,11 + AT START/WIND/DYN BRAKE 19 J6,6-J11,9-J13,12-J26,6 EDIT COMMAND 20 J11,10 SUPPLY START INHIBIT 21 N.C. 22 N.C. 23 N.C. 24 N.C. 25 J4-- -15 V 26 J4-- GROUND 27 J4-- +15 V 28 J4-- +24 V 29 J6,13 TAPE END MOTORBRAKE SUPPLY

30 J6,14 TAPE END MOTORBRAKE TAKE UP 31 N.C. 32 N.C.

CONNECTOR J6: CONNECTING TAPE END MOTORBRAKE AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4,38 BRAKE COMMAND, SUPPLY 2 J4,39 BRAKE COMMAND, TAKE UP 3 N.C. 4 N.C. 5 N.C. 6 J5,19-J11,9-J13,12-J26,6 EDIT COMMAND 7 J5,17-J8,11-J13,1-J14,7 + AT TAPE LOAD 8 J5,18-J8,10-J12-9-J13,11 + AT START/WIND/DYN BRAKE 9 J4-- -15 V 10 J4-- GROUND 11 J4-- +15 V 12 J4-- +24 V 13 J5,29 TAPE END MOTORBRAKE SUPPLY 14 J5,30 TAPE END MOTORBRAKE TAKE UP 15 N.C. 16 N.C.

CONNECTOR J7: CONNECTING TAPE LIFT AND CUT LOGIC AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J3,16-J8,4 PLAY LIFT 2 J3,17-J8,5 ERASE LIFT 3 J8,1-J11,1 WIND SPEED 4 J8,7-J9,5-J14,33-J24,4 EDIT BUTTON PRESSED 5 J10,8 DEMUTE 6 J3,20-J8,8-J9,6-J10,7-J13,10-J14,34-J24,8-DIL4 EDIT COMMAND 7 J5,15-J10,4-J11,4-J12,5-J26,9 START COMMAND CAPSTAN 8 J14,23-J22,4 STOP BUTTON PRESSED 9 J11,7 STOP OUT 1 10 J4-- -15 V 11 J4-- GROUND 12 J4-- +15 V 13 J4-- +24 V 14 N.C. 15 J14,37 LIFT RESET 16 J4,20 CUTTER SENSE 17 DIL13

CONNECTOR J8: CONNECTING SERVO LIMIT DETECTOR AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J7,3-J11,1 WIND SPEED 2 J3,33-J5,1 SUPPLY SERVO SENSOR 3 J3,34-J5,2-J26,5 TAKE UP SERVO SENSOR 4 J3,16-J7,1 PLAY LIFT 5 J3,17-J7,2 ERASE LIFT 6 J3,15 PINCHROLLER OFFSET 7 J7,4-J9,5-J14,33-J24,4 EDIT BUTTON PRESSED 8 J3,20-J7,6-J9,6-J10,7-J13,10-J14,34-J24,8-DIL4 + AT EDIT 9 J11,15-J12,14-J13,17 + AT RUNNING TAPE 10 J5,18-J6,8-J12,9-J13,11 + AT START/WIND/DYN BRAKE 11 J6,7-J13,1-J14,7 + AT TAPE LOAD 12 J4-- -15 V 13 J4-- GROUND 14 J4-- +15 V 15 J4-- +24 V 16 J11,19 TAPE END STOP 17 DIL15

CONNECTOR J9: CONNECTING EDIT WIND LOGIC AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J2,17 COMPRESSED ANALOG SPEED 2 J5,10 WIND COMPUTE 3 J5,9 REWIND COMPUTE 4 J5,8-J14,9 EDIT WIND COMMAND 5 J7,4-J8,7-J14,33-J24,4 EDIT BUTTON PRESSED 6 J3,20-J7,6-J8,8-J10,7-J13,10-J14,34-J24,8-DIL4 + AT EDIT 7 J12,7 WIND COMMAND 8 J12,8 REWIND COMMAND 9 J4-- -15 V 10 J4-- GROUND 11 J4-- +15 V 12 J2,16 -V REF 13 J36,1 EDIT WIND POTENTIOMETER 1 14 J36,2 EDIT WIND POTENTIOMETER WIPER

15 J36,4 EDIT WIND POTENTIOMETER 2 16 J36,3 EDIT WIND SENSE

CONNECTOR J10: CONNECTING CAPSTAN START TIME SENSOR AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J3,11 RECORD INHIBIT 2 J4,40-J5,3-J35,4 POWER SELECTOR 3 J5,13 START POWER 4 J5,15-J7,7-J11,4-J12-5-J26,9 START COMMAND CAPSTAN 5 J3,18-J13-9-J14,30-J23,8 RECORD COMMAND/LAMP 6 J13,6 + AT START/RECORD 7 J3,20-J7,6-J8,8-J9,6-J13,10-J14,34-J24,8-DIL4 + AT EDIT 8 J7,5 DEMUTE 9 J4-- -15 V 10 J4-- GROUND 11 J4-- +15 V 12 J4-- +24 V 13 J27,1 START POWER SENSE 14 J25,12 REPRO 15 J25,11 SYNC 16 J25,2 RECORD CONTROL 17 DIL1 18 DIL16

CONNECTOR J11: CONNECTING TAPE MOTION SENSOR AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J7,3-J8,1 + AT WIND SPEED 2 J1,14 COUNTER INHIBIT 3 J2,11-J14,25-J22,7 STOP OUT 2 4 J5,15-J7,7-J10,4-J12,5-J26,9 START COMMAND CAPSTAN 5 J3,4-J5,11-J12,4-J14,11-J19,8 REWIND LAMP 6 J3,3-J5,12-J12,3-J14,15-J20,8 WIND LAMP 7 J7,9 STOP OUT 1 8 J5,17-J6,7-J8,11-J13,1-J14,7 TAPE LOAD 9 J5,19-J6,6-J13,12 EDIT COMMAND 10 J5,20 SUPPLY START INHIBIT 11 J4-- -15 V 12 J4-- GROUND 13 J4-- +15 V 14 J4-- +24 V 15 J8,9-J12,4-J13,17 + AT RUNNING TAPE 16 J12,15 + AT START/WIND/DYN BRAKE 17 J12,16 TACHO PULSES, FORWARD AND REWIND 18 J12,17-DIL3 DYNAMIC BRAKE INHIBIT 19 J8,16 TAPE END STOP 20 DIL2

CONNECTOR J12: CONNECTING REEL MOTOR COMMANDER AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J1,1 TUCHO PULSE, FORWARD 2 J1,2 TACHO PULSE, REWIND 3 J3,3-J5,12-J11,6-J14,15-J20,8 WIND LAMP 4 J3,4-J5,11-J11,5-J14,11-J19,8 REWIND LAMP 5 J5,15-J7,7-J10,4-J11,4-J26,9 START COMMAND CAPSTAN 6 J13,8 NOT USED 7 J9,7 WIND COMMAND 8 J9,8 REWIND COMMAND 9 J5,18-J6,8-J8,10-J13,11 + AT START/WIND/DYN BRAKE 10 J4-- -15 V 11 J4-- GROUND 12 J4-- +15 V 13 J4-- +24 V 14 J8,9-J11,15-J13,17 + AT RUNNING TAPE 15 J11,16 + AT START/WIND/DYN BRAKE 16 J11,17 TACHO PULSES FORWARD AND REWIND 17 J11,18-DIL3 DYNAMIC BRAKE INHIBIT

CONNECTOR J13: CONNECTING EDIT AND START ENABLE AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J5,17-J6,7-J8,11-J11,8-J14,7 + AT TAPE LOAD 2 J14,8 MECHANICAL BRAKE RELEASE 3 J4,19 TO BRAKE SOLENOIDS 4 J3,14-J5,7 PINCHROLLER ATTACK 5 J3,2-J14,20-J21,8 + AT START 6 J10,6 + AT START AND RECORD 7 J3,9 BRAKE COMMAND 8 J12,6 NOT USED 9 J3,18-J10,5-J14,30-J23,8 + AT RECORD 10 J3,20-J7,6-J8,8-J9,6-J10,7-J14,34-J24,8-DIL4 + AT EDIT

11 J5,18-J6,8-J8,10-J12,9 + AT START/WIND/DYN BRAKE 12 J5,19-J6,6-J11,9-J26,6 EDIT COMMAND 13 J4-- -15 V 14 J4-- GROUND 15 J4-- +15 V 16 J4-- +24 V 17 J8,9-J11,15-J12,14 + AT RUNNING TAPE 18 J28,1 + AT RUNNING CAPSTAN 19 J1,16-J14,42-J28,2-J33,8 HIGH SPEED LAMP 20 J25,1 - AT HIGH SPEED TO AUDIO AMPS

CONNECTOR J14: CONNECTING DIODE MATRIX AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 N.C. 2 DIL11 FLASHING STOP LAMP ENABLE 3 J1,18 + AT WIND/REWIND 4 J1,17 SPEED DISPLAY COMMAND 5 J2,9-J17,3 SEARCH ZERO LAMP 6 J2,10-J18,3 SEARCH CUE LAMP 7 J5,17-J6,7-J8,11-J11,8-J13,1 + AT TAPE LOAD 8 J13,2 MECHANICAL BRAKE RELEASE 9 J5,8-J9,4 EDIT WIND COMMAND 10 J2,14-J19,7 REWIND COMMAND 11 J3,4-J5,11-J11,5-J12,4-J19,8 REWIND LAMP 12 J19,9 REWIND DISABLE IN 13 J19,10 REWIND DISABLE OUT 14 J2,13-J20,7 WIND COMMAND 15 J3,3-J5,12-J11,6-J12,3-J20,8 WIND LAMP 16 J20,9 WIND DISABLE IN 17 J20,10 WIND DISABLE OUT 18 J1,19-J21,4 START LAMP 19 J2,12-J21,7 START COMMAND 20 J3,2-J13,5-J21,8 + AT START 21 J21,9 START DISABLE IN 22 J21,10 START DISABLE OUT 23 J7,8-J22,4 STOP BUTTON PRESSED 24 J22,5 STOP AT POWER ON 25 J2,11-J11,3-J22,7 STOP COMMAND 26 J1,20-J3,1-J22,8 STOP LAMP 27 J22,9-DIL6 STOP DISABLE IN 28 J22,10 STOP DISABLE OUT 29 J3,19-J23,4 RECORD BUTTON PRESSED 30 J3,18-J10,5-J13,9-J23,8 RECORD LAMP 31 J23,9 RECORD DISABLE IN 32 J23,10 RECORD DISABLE OUT 33 J7,4-J8,7-J9,5-J24,4 EDIT BUTTON PRESSED 34 J2,20-J7,6-J8,8-J9,6-J10,7-J13,10-J24,8-DIL4 EDIT COMMAND/LAMP 35 J24,9 EDIT DISABLE IN 36 J24,10 EDIT DISABLE OUT 37 J7,15 TAPE LIFT RESET 38 J34,4 LOW SPEED BUTTON PRESSED 39 J34,9 LOW SPEED DISABLE IN 40 J34,10 LOW SPEED DISABLE OUT 41 J33,4 HIGH SPEED BUTTON PRESSED 42 J1,16-J13,19-J28,2-J33,8 HIGH SPEED LAMP 43 J33,9 HIGH SPEED DISABLE IN 44 J33,10 HIGH SPEED DISABLE OUT 45 J4-- GROUND 46 J4-- +24 V 47 J33,1-J34,1 SPEED SELECT ENABLE

CONNECTOR J15: CONNECTING SET ZERO PUSHBUTTON AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- GROUND 2 J4-- +24 V 3 N.C. 4 J1,9-J3,8 SET ZERO COMMAND

CONNECTOR J16: CONNECTING SET CUE PUSHBUTTON AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- GROUND 2 J4-- +24 V 3 N.C. 4 J1,8-J3,7 SET CUE COMMAND

CONNECTOR J17: CONNECTING SEARCH ZERO PUSHBUTTON AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- GROUND 2 J4-- +24 V 3 J2,9-J14,5 SEARCH ZERO LAMP

4 J1,11-J3,6 SEARCH ZERO COMMAND

CONNECTOR J18: CONNECTING SEARCH CUE PUSHBUTTON AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- GROUND 2 J4-- +24 V 3 J2,10-J14,6 SEARCH CUE LAMP 4 J1,10-J3,5 SEARCH CUE COMMAND

CONNECTOR J19: CONNECTING REWIND PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- +24 V 2 J4-- +24 V 3 J4-- GROUND 4 N.C. 5 N.C. 6 N.C. 7 J2,14-J14,10 REWIND COMMAND 8 J3,4-J5,11-J11,5-J12,4-J14,11 REWIND LAMP 9 J14,12 REWIND DISABLE IN 10 J14,13 REWIND DISABLE OUT

CONNECTOR J20: CONNECTING WIND PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- +24 V 2 J4-- +24 V 3 J4-- GROUND 4 N.C. 5 N.C. 6 N.C. 7 J2,13-J14,14 WIND COMMAND 8 J3,3-J5,12-J11,6-J12,13-J14,15 WIND LAMP 9 J14,16 WIND DISABLE IN 10 J14,17 WIND DISABLE OUT

CONNECTOR J21: CONNECTING START PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- +24 V 2 J4-- +24 V 3 J4-- GROUND 4 J23,1 START PUSHBUTTON PRESSED 5 N.C. 6 J1,19-J14,18 START LAMP 7 J2,12-J14,19 START COMMAND 8 J3,2-J13,5-J14,20 START LAMP 9 J14,21 START DISABLE IN 10 J14,22 START DISABLE OUT

CONNECTOR J22: CONNECTING STOP PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- +24 V 2 J4-- +24 V 3 J4-- GROUND 4 J7,8-J14,23 STOP PUSHBUTTON PRESSED 5 J14,24 STOP AT POWER ON 6 N.C. 7 J2,11-J11,3-J14,25 STOP COMMAND 8 J1,20-J3,1-J14,26 STOP LAMP 9 J14,27-DIL6 STOP DISABLE IN 10 J14,28 STOP DISABLE OUT

CONNECTOR J23: CONNECTING RECORD PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J21,4 START PUSHBUTTON PRESSED 2 J4-- +24 V 3 J4-- GROUND 4 J3,19-J14,29 RECORD PUSHBUTTON PRESSED 5 N.C. 6 N.C. 7 N.C. 8 J3,18-J10,5-J13,9-J14,30 RECORD LAMP 9 J14,31 RECORD DISABLE IN 10 J14,32 RECORD DISABLE OUT

CONNECTOR J24: CONNECTING EDIT PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4-- +24 V 2 J4-- +24 V 3 J4-- GROUND 4 J7,4-J8,7-J9,5-J14,23 EDIT PUSHBUTTON PRESSED

5 N.C. 6 N.C. 7 N.C. 8 J3,20-J7,6-J8,8-J9,6-J10,7-J13,10-J14,34-DIL4 EDIT LAMP 9 J14,35 EDIT DISABLE IN 10 J14,36 EDIT DISABLE OUT

CONNECTOR J25: CONNECTING AUDIO CABLE AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J13,20 + AT HIGH SPEED 2 J10,16 RECORD CONTROL 3 J30,2-J32,3 CH 1 AUDIO 4 J29,2-J32,4 CH 2 AUDIO 5 J4,9-J4,29-J25,15-J29,7-J30,7 -15 V FOR AUDIO 6 J4,3-J4,28-J25,16-J29,8-J30,8 +15 V FOR AUDIO 7 J4,7-J4,27-J25,17-J29,6-J30,6 GROUND FOR AUDIO 8 J4,5-J4,25-J25,18 +5 V FOR AUDIO 9 N.C. 10 N.C. 11 J10,15 SYNC COMMAND 12 J10,14 REPRO COMMAND 13 J3,23 HARDWARE 14 N.C. 15 SEE PIN 5 16 SEE PIN 6 17 SEE PIN 7 18 SEE PIN 8 19 N.C. 20 J3,21-J27,8 VARISPEED

CONNECTOR J26: CONNECTING CAPSTAN OUTPUT AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J4,15-J4,35 SENSE RESISTOR CAPSTAN 2 J4,14-J4,34 BASE, CAPSTAN SERIES TRANSISTOR 3 J4,13-J4,33 EMITTER, CAPSTAN SERIES TRANSISTOR 4 N.C 5 J3,34-J5,2-J8,3 TAKE UP SERVO SENSOR 6 J5,19-J6,6-J11,9-J13,2 EDIT COMMAND 7 N.C. 8 N.C. 9 J5,15-J7,7-J10,4-J11,4-J12,5 START COMMAND CAPSTAN 10 J4-- -15 V 11 J4-- GROUND 12 J4-- +5 V 13 J4-- +15 V 14 J4-- +24 V 15 J27,15 CAPSTAN CONTROL VOLTAGE 16 N.C.

CONNECTOR J27: CONNECTING CAPSTAN DRIVER AMPLIFIER AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J10,13 START POWER SENSE 2 N.C. 3 N.C. 4 N.C. 5 N.C. 6 N.C. 7 J3,22 CAPSTAN SYNC 8 J3,21 VARISPEED 9 N.C. 10 J4-- -15 V 11 J4-- GROUND 12 J4-- +5 V 13 J4-- +15 V 14 J4-- +24 V 15 J26,15 CAPSTAN CONTROL VOLTAGE 16 J28,15 CAPSTAN FREQ. DEMODULATED

CONNECTOR J28: CONNECTING CAPSTAN SPEED DETECTOR AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J13,18 + AT RUNNING CAPSTAN 2 J1,16-J13,19-J14,42-J33,8 HIGH SPEED LAMP 3 J34,8 LOW SPEED LAMP 4 N.C. 5 N.C. 6 N.C. 7 N.C. 8 N.C. 9 J4,36 CAPSTAN PREAMP 1 10 J4-- -15 V

11 J4-- GROUND 12 J4-- +5 V 13 J4-- +15 V 14 J4-- +24 V 15 J27,16 CAPSTAN FREQ. DEMODULATED 16 J4,37 CAPSTAN PREAMP 2

CONNECTOR J29: CONNECTING HEADPHONE AND SPEAKER AMPLIFIER 1 AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J31,4 PHONES OUTPUT 2 J25,4-J32,4 AUDIO INP/O POS. ATT. SWITCH 3 J32,5 ARM, ATT. SWITCH 4 J32,6 -20 POS. ATT. SWITCH 5 J30,5-J31,1-J31,3 GROUND 6 J4,7-J4,27-J25,7-J25,17-J30,6 GROUND 7 J4,9-J4,29-J25,5-J25,15-J30,7 -15 V FOR AUDIO 8 J4,8-J4,28-J25,6-J25,16-J30,8 +15 V FOR AUDIO

CONNECTOR J30: CONNECTING HEADPHONE AND SPEAKER AMPLIFIER 2 AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J31,2 PHONES OUTPUT 2 J25,3-J32,3 AUDIO INP/O POS. ATT. SWITCH 3 J32,2 ARM, ATT. SWITCH 4 J32,1 -20 POS. ATT. SWITCH 5 J29,5-J31,1-J31,3 GROUND 6 J4,7-J4,27-J25,7-J25,17-J29,6 GROUND 7 J4,9-J4,29-J25,5-J25,15-J29,7 -15 V FOR AUDIO 8 J4,8-J4,28-J25,6-J25,16-J29,8 +15 V FOR AUDIO

CONNECTOR J31: CONNECTING HEADPHONE JACK AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J29,5-J30,5-J31,3 GROUND 2 J30,1 PHONES OUTPUT 2 3 J29,5-J30,5-J31,1 GROUND 4 J29,1 PHONES OUTPUT 1

CONNECTOR J32: CONNECTING ATTENUATOR SWITCH AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J30,4 -20 POS. 1 2 J30,3 ARM 1 3 J25,3-J30,2 0 POS. 1 4 J25,4-J29,2 0 POS. 2 5 J29,3 ARM 2 6 J29,4 -20 POS. 2

CONNECTOR J33: CONNECTING HIGH SPEED PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J14,47-J34,1 SPEED SELECT ENABLE 2 J4-- +24 V 3 J4-- GROUND 4 J14,41 HIGH SPEED PUSHBUTTON PRESSED 5 C2 HIGH SPEED AT POWER ON 6 N.C. 7 N.C. 8 J1,16-J13,19-J14,42-J28,2 HIGH SPEED LAMP 9 J14,43 HIGH SPEED DISABLE IN 10 J14,44 HIGH SPEED DISABLE OUT

CONNECTOR J34: CONNECTING LOW SPEED PUSHBUTTON AMP AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J14,47-J33,1 SPEED SELECT ENABLE 2 J4-- +24 V 3 J4-- GROUND 4 J14,38 LOW SPEED PUSHBUTTON PRESSED 5 C1 LOW SPEED AT POWER ON 6 N.C. 7 N.C. 8 J28,3 LOW SPEED LAMP 9 J14,39 LOW SPEED DISABLE IN 10 J14,40 LOW SPEED DISABLE OUT

CONNECTOR J35: NOT USED

CONNECTOR J36: CONNECTING EDIT WIND POTENTIOMETER AND MOTHERBORD PIN # CONNECTS TO: FUNCTION: 1 J9,13 EDIT WIND POTENTIOMETER 1 2 J9,14 EDIT WIND POTENTIOMETER WIPER 3 J9,16 EDIT WIND POTENTIOMETER SENSE 4 J9,15 EDIT WIND POTENTIOMETER 2

DUAL-IN-LINE SWITCH CONNECTIONS PIN # CONNECTS TO: FUNCTION IN ON: 1 J10,17 16 J10,18 AMPLIFIER MUTE AT STOP

2 J11,20 15 J8,17 MANUAL ACTIVE STAND-BY

3 J11,18-J12,17 14 GROUND NO DYNAMIC BRAKING

4 J3,20-J8,8-J9,6-J10,7-J13,10-J14,34-J24,8 13 J7,17 EDIT WIND TAPE LIFT DEFEAT

5 R7 12 GROUND LOW TAPE SPEED PRIORITY

6 J14,27-J22,9 11 J14,2 FLASHING STOP LAMP AT UNLOAD

OTHER CONNECTIONS R1 (1K2) IN SERIES WITH D1 (LED): FROM +24 V TO GROUND R2 (750E) IN SERIES WITH D2 (LED): FROM +15 V TO GROUND R3 (270E) IN SERIES WITH D3 (LED): FROM +5 V TO GROUND R4 (750E) IN SERIES WITH D4 (LED): FROM GROUND TO -15 V

R5 (750E) IN SERIES WITH D5 (LED): FROM +15 V FOR AUDIO TO GROUND R6 (750E) IN SERIES WITH D6 (LED): FROM GROUND TO -15 V FOR AUDIO

R7 (470E) IN SERIES WITH C1 (1.5 uF): FROM J34,5 TO DIL5 R8 (470E) IN SERIES WITH C2 (0.47 uF): FROM J33,5 TO GROUND

MOTHERBOARD CONNECTOR NAME DRAWING

--------------------------------------------------------------- J1 TACHOMETER LOGIC 9781-84 J2 TACHOMETER LOGIC 9781-84 J3 REMOTE CABLE J4 POWER CABLE J5 SERVO MIXER AMPLIFIER 9674 J6 TAPE END MOTORBRAKE 9673 J7 TAPE LIFT AND CUT LOGIC 9672 J8 SERVO LIMIT DETECTOR 9737 J9 EDIT WIND LOGIC 9669 J10 CAPSTAN START TIME SENSOR 9668 J11 TAPE MOTION SENSOR 9900 J12 REEL MOTOR COMMANDER 9666 J13 EDIT AND START ENABLE 9665 J14 DIODE MATRIX 9664 J15 SET ZERO PUSHBUTTON J16 SET CUE PUSHBUTTON J17 SEARCH ZERO PUSHBUTTON J18 SEARCH CUE PUSHBUTTON J19 REWIND PUSHBUTTON AMPLIFIER 9312 J20 WIND PUSHBUTTON AMPLIFIER 9312 J21 START PUSHBUTTON AMP 9312 J22 STOP PUSHBUTTON AMPLIFIER 9312 J23 RECORD PUSHBUTTON AMPLIFIER 9312 J24 EDIT PUSHBUTTON AMPLIFIER 9312 J25 AUDIO CABLE J26 CAPSTAN OUTPUT AMPLIFIER 9759 J27 CAPSTAN DRIVER AMPLIFIER 9676 J28 CAPSTAN SPEED DETECTOR 9675 J29 HEADPHONE AND SPEAKER AMPLIFIER 1 9953 J30 HEADPHONE AND SPEAKER AMPLIFIER 2 9953 J31 HEADPHONE JACK J32 ATTENUATOR SWITCH J33 HIGH SPEED PUSHBUTTON AMPLIFIER 9312 J34 LOW SPEED PUSHBUTTON AMPLIFIER 9312 J35 NOT USED J36 EDIT WIND POTENTIOMETER

A P P E N D I X +++++++++++++++

L Y R E C M O D E L T R 5 5 - Q C

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LYREC MODEL TR55-QC IS A SPECIAL MACHINE DERIVED FROM THE TR55 TAPE DECK.

LYREC TR55-QC IS INTENDED TO BE USED FOR QUALITY CONTROL OF PRERECORDED CASSETTE TAPE ON OPEN REELS OR HUBS.

TR55-QC DIFFERS FROM WHAT IS DESCRIBED IN THE TR55 LEAFLET. THE SPECIAL FEATURES OF TR55-QC ARE;

BI-DIRECTIONAL TAPE TRANSPORT FOR 0,15" (3,81 mm) TAPE WITH A TAPE SPEED OF 1 7/8 IPS (4,76 CM/SEC).

ELECTRONIC TAPE TIMER INDICATING HOURS, MINUTES AND SECONDS AT 1 7/8 IPS.

SEARCH FACILITY ALLOWING SEARCH TO EITHER "ZERO" OR NEXT RECORDED CUE TONE (CUE FINDER).

THE HEADBLOCK IS EQUIPPED WITH TWO INDIVIDUAL PLAYBACK HEADS, ONE FOR TRACKS 1 AND 2, AND ONE FOR TRACKS 3 AND 4.

THE AUDIO AMPLIFIERS HAVE TWO LINE OUTPUTS WHICH ARE AUTOMATICALLY SWITCHED WITH THE TAPE DIRECTION. A SWITCH FOR REVERSED MONITORING IS AVAILABLE.

THE AUDIO AMPLIFIERS HAVE TWO INDIVIDUAL SETS OF EQUALIZER NETWORKS SWITCHABLE FROM THE FRONTPANEL WITH SWITCHES MARKED "NORMAL EQ" AND "SPECIAL EQ". THEY ARE NORMALLY ALIGNED FOR 70 AND 120 MICROSECOND STANDARD.

BUILT IN MONITOR LOUDSPEAKER (MONO) AND HEADPHONE OUTPUT (STEREO) WITH VOLUME CONTROL.

AZIMUTH ADJUSTMENT SCREWS EQUIPPED WITH SCALED KNOBS AND FULLY COMPATIBLE WITH AZIMUTH ADJUSTMENT OF LYREC DUPLICATORS.

LYREC TR55-QC IS SUPPLIED COMPLETE WITH CONSOLE WITH CASTORS (OPERATING HEIGHT 850 mm). TAPE CUTTER IS NOT SUPPLIED.

oooOooo

T R 5 5 - Q C +++++++++++++

PRELIMINARY OPERATING INSTRUCTIONS ++++++++++++++++++++++++++++++++++

THE TR55-QC IS A SPECIAL RECORDER DERIVED FROM THE 1/4" VERSION OF MODEL TR55.

MOST OF THE OPERATING INSTRUCTIONS FOR TR55 ARE VALID, BUT THERE ARE HOWEVER SOME SPECIAL INSTRUCTIONS TO GET FULL BENEFIT OF THE FEATURES OF TR55-QC.

THERE ARE TWO PLAY BUTTONS, ONE FOR EACH PLAY DIRECTION AND THE TOP COVERS ARE ENGRAVED "<" AND ">" INDICATING PLAY DIRECTION. THE CAPSTAN MOTOR IS CONSTANTLY RUNNING IN THE SELECTED DIRECTION. PLAY DIRECTION CAN BE CHANGED IN EITHER PLAY OR STOP MODE. THE CAPSTAN MOTOR NEED ABOUT 3,5 SECONDS TO CHANGE DIRECTION. DURING CANGEOVER THE TAPE STOPS.

THE AUDIO AMPLIFIERS AUTOMATICALLY FOLLOW THE TAPE DIRECTION. WITH THE PUSHBUTTON "REVERSE AUDIO" IT IS POSSIBLE TO MONITOR THE BACK SIDE TRACKS.

TO RESTORE NORMAL MONITORING PRESS THE ILLUMINATED PLAY BUTTON ( "<" OR ">" ).

THE AUDIO AMPLIFIERS ARE SWITCHABLE BETWEEN TWO DIFFERENT EQUALIZER SETTINGS WITH THE PUSHBUTTONS "NORMAL EQ" AND "SPECIAL EQ". SELECTION CAN ONLY BE DONE IN STOP MODE TO PREVENT CLICKS ON THE LINE OUTPUT.

IN THIS PARTICULAR UNIT THE EQ ARE BOTH SET TO 120 uS IN BOTH RECORD AND PLAYBACK. THE RECORD EQ ARE IN POSITION "NORMAL" SET TO AGFA PE619, AND IN POSITION "SPECIAL" TO BASF TP18 CHROME.

RECORD IS ENTERED BY SIMULTANEOUSLY PRESSING "REC" AND ">". RECORD CAN NOT BE ENTERED IN REVERSE DIRECTION "<".

A RECORD - PLAYBACK SWITCH IS MOUNTED ON THE HEADBLOCK. THIS SWITCH CHANGES THE CONNECTIONS BETWEEN THE AMPLIFIER AND THE RECORD HEAD TRACK 1 & 2 AND THE PLAYBACK HEAD TRACK 3 & 4.

WARNING NR 1. $$$$$$$$$$$$$

DO NOT ENTER RECORD WITH THE SWITCH IN PLAYBACK POSITION. IF DONE, TRACKS 1 & 2 ARE ERASED AND TRACKS 3 & 4 ARE RECORDED.

WARNING NR 2. ++++++++++++

WHEN IN RECORD, DO NOT CHANGE TAPE DIRECTION. ONCE IN RECORD A CHANGE OF DIRECTION WILL NOT CANCEL THE RECORD FUNCTION. IF DONE, TRACKS 1 & 2 WILL END UP ERASED AFTER RECORD.

THE SEARCH SYSTEM IN TR55-QC ALLOWS ZEARCH TO EITHER "ZERO" OR THE NEXT COMING CUE TONE ON THE PANCAKE.

THE TAPE TIMER CAN AT ANY TIME BE RESET TO ZERO WITH THE "RESET" BUTTON.

WHEN THE "SEARCH ZERO" BUTTON IS PRESSED, ZERO POSITION WILL BE LOCATED.

WHEN THE "SEARCH CUE" BUTTON IS PRESSED THE THE RECORDER WILL ENTER FAST FORWARD MODE. WHEN THE NEXT UPCOMING CUE TONE IS DETECTED IT WILL SLOWLY REWIND AND STOP AT THE CUE TONE.

IT IS ALSO POSSIBLE TO LOCATE THE NEXT UPCOMING CUE TONE IN REVERSE DIRECTION. FIRST PRESS THE REWIND BUTTON "<<" FOLLOWED BY THE "SEARCH CUE" BUTTON.

TO ACCOMMODATE FOR DIFFERENT HUBS AND REELTYPES TWO METAL RINGS ARE SUPPLIED (2 mm THICK). THE RINGS ARE PLACED ON THE REEL PLATFORM BELOW THE TAPE TO ACHIEVE THE PROPER HEIGHT.

THE SUPPLY REEL IS EQUIPPED WITH A PACKER ARM WHICH SHALL BE USED IN CONNECTION WITH OPEN PANCAKES. A PLASTIC SPOOL SHALL ALWAYS BE USED ON THE TAKE UP SIDE.

A P P E N D I X +++++++++++++++

L Y R E C M O D E L T R 5 5 - 2 / 4 - 0 , 5 "

---------------------------------------------------

LYREC MODEL TR55-2/4-0,5" IS A SPECIAL VERSION OF THE TR55 SERIES TAPE DECKS AND IS INTENDED FOR PRODUCTION OF DUPLICATION MASTER TAPES THAT ARE LATER USED IN THE LYREC DUPLICATING EQUIPMENT.

THE RECORDER HAS ALL THE FEATURES OF THE STANDARD TR55 BUT IS BUILT FOR 0,5" TAPE.

IT IS BASICALLY A STEREO RECORDER EQUIPPED WITH 0,5" 4-TRACK HEADS IN A 2/4 TRACK CONFIGURATION.

TAPE SPEEDS 3,75 AND 7,5 IPS (9,5 AND 19,05 CM/S).

THE RECORDER IS EQUIPPED WITH TWO RECORD/PLAYBACK AUDIO AMPLIFIERS CONNECTED TO TRACKS 1 AND 2. FACILITY TO SWITCH THE PLAYBACK AMPLIFIER MOMENTARY TO TRACKS 3 AND 4 TO LOCATE STARTING POINT OF B-SIDE.

oooOooo