GB 2 VR120 Contents Page Contents Page List of PWBs, Features, Technical Electrical alignments specifications Measuring instruments Survey of sets and PWB’s with software versions 3 Setting instructions Features Video signal processing (VS-SEC) Technical specification Front End (FV) Deck electronics (DE)
List of PWBs, Features, Technical specifications VR120 GB 3 1. List of PWBs, Features, Technical specifications Survey of sets and PWB’s with software versions All in One- key print SYSTEMS (AIO) µP connector TAPE DECK Pos. 7899 print System off air...
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GB 4 VR120 List of PWBs, Features, Technical specifications All in One- key print SYSTEMS (AIO) µP connector TAPE DECK Pos. 7899 print System off air Rec/Pb standard Mobo chapter 7 chapter 10 µP-ID No. 32 37 á á á á...
List of PWBs, Features, Technical specifications VR120 GB 5 Features General á á á á á á á á á á á á á á á á á á á á á Auto Standby On/Off á á á á á á á á á á á á á á á á á á á á á...
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GB 6 VR120 List of PWBs, Features, Technical specifications General á á á á á á á á á á á á á á á á á á á á Auto Standby On/Off á á á á á á á á á á á á á á á á á á á á...
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List of PWBs, Features, Technical specifications VR120 GB 7 General á á á á á á á á á á á á á á á á á á á á Auto Standby On/Off á á á á á á á á á á á á á á á á á á á á...
GB 8 VR120 List of PWBs, Features, Technical specifications General á á á á á á á á á á á á á á á á á á á á á á Auto Standby On/Off á á á á á á á á á á á á á á á á á á á á á á...
List of PWBs, Features, Technical specifications VR120 GB 9 Technical specification Cinch Audio/Video input on front panel (OPTION) Mains voltage : 220 - 240 V, +/- 10% Mains frequency : 45 - 65 Hz Audio: Power consumption : mono 12.5 W during AINFR (audio right in) red 0.2 V...
GB 10 VR120 Safety instructions, Modifications 2. Safety instructions, Modifications Safety instructions 2.1.1 Remarks • The direct voltages and oscillograms ought to be • Safety regulations demand that the set be restored to its measured relative to the set mass.
Safety instructions, Modifications VR120 GB 11 Modifications Tape deck 2.2.1 Updating the service manual 011731 12WD44 12345678 10001 A12T-P2/0LP All modifications and/or supplements to the Service Manual are published by means of Service Information bulletins. Production code Factory indication Each Service Information is numbered:...
Direction for use VR120 GB 13 Remote control SMART: To adjust the picture setting during playback SMART STANDBY/ON m Switch off : To switch off set, interrupt menu function, interrupt a programmed recording (TIMER) Delete : To delete last entry/Clear programmed recording (TIMER)
GB 46 VR120 Dismantling instructions 4. Dismantling instructions Dismantling instructions General guidelines for dismantling housing components, electronic parts and the drive mechanism Always disconnect from mains before dismantling or assembly. Due to the supply voltages (hot circuit) on the primary side of the switched-mode power supply, an isolating transformer is required for the operation of the device.
Dismantling instructions VR120 GB 47 Dismantling of the motherboard/drive combination (Figure 4-3 and 4-4) Preparation Remove the housing cover as described in section 1. Remove the front panel as described in section 3. – Move device into operational position (Figure 4-3).
GB 48 VR120 Dismantling instructions Dismantling the drive (Figure 4-3, 4-5 and 4-6) Preparation Remove the housing cover as described in section 1. Remove the front panel as described in section 3. – Undo the two screws (B) of the stay and pull it up to remove it.
Service modes, Repair tips VR120 GB 49 5. Service modes, Repair tips Special functions The display shows, for instance: 5.1.1 Erasing the EEPROM – Disconnect from mains – Push and hold down the Standby key, reconnect to mains and keep the Standby key depressed for a further Central control Product ID.
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GB 50 VR120 Service modes, Repair tips 5.2.4 Description of steps with modes: A: DC, 2 V/Div, 0.5 s/Div Step 00: Display of mask version number B: DC, 2 V/Div, 0.5 s/Div After activating the service test program, step 00 and the mask version number are automatically displayed.
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Service modes, Repair tips VR120 GB 51 Error table: Step 04: Display of the operating hours counter: By pressing the SELECT key whilst step 04 is flashing, the operating hours counter shows how many hours the head no error disk has turned. The hours are displayed as a 4-digit decimal threading error number.
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GB 52 VR120 Service modes, Repair tips Step 10: Operation without drive - dummy mode Before activating this mode with the SELECT key, the recorder must be in the EJECT position. Enter the mode by pressing the SELECT key. The motors are then switched off and the sensors will be ignored by the deck microprocessor.
Service modes, Repair tips VR120 GB 53 Repair tips b. Using tweezers press down the part and solder both electrodes as shown below. 5.3.1 Replacement procedure for leadless components (chip) Tweezers The following procedures are recommended for replacing leadless components used in this unit.
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GB 54 VR120 Service modes, Repair tips • Using a soldering iron • Using a special removal device a. Use unsoldering braid to remove the solder from all a. Apply extra tin-lead solder onto the pins pins of the Flat Pack IC. Apply solder flux to all pins of the Flat Pack IC, to allow easy removal.
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Service modes, Repair tips VR120 GB 55 How to read wave forms Presolder Connecting point Soldering iron Aplitude Time base Operating mode of the VCR C.B.A. Flat Pack IC Figure 5-7 c. Solder all pins of the Flat Pack IC. Make sure that none of...
Block diagrams, Waveforms VR120 Supply voltages and Bus diagram Engineer's remarks: Interconnections: AF page 73 AL page 72 AIO1 page 66 AIO2 page 65 DE page 67 FM ST page 70 FM NIC-page 71 FV page 69 FOME page 78...
Block diagrams, Waveforms VR120 Block diagram Central Control (AIO1, AIO2) AC3P1 - xU AC3P7 - xU not used for M63100BFP AC3B1 - xU Interconnections: AF page 73 AL page 72 AIO1 page 66 AIO2 page 65 DE page 67 FM ST page 70...
Circuit diagrams and PWB layouts, Wiring diagram VR120 Variant List Frontend (FV) PAL I PAL, BG/I, PAL, SEC PAL, SEC, PAL,SEC DK PAL, BG/I/DK, PAL, SEC PAL,SEC PAL,SEC DK PAL BG PAL I fullband PAL BG PAL I fullband PAL BG UHF only SEC L/L’...
Electrical alignments VR120 GB 91 8. Electrical alignments Measuring instruments Video signal processing (VS-SEC) The following instruments are required to carry out the Service tasks after replacement of ICs 7004, 7072: electrical setting work: Before commencing adjustment: 1. Dual trace oscilloscope...
GB 92 VR120 Electrical alignments Notes: 8.4.2 HF - AGC adjustment [3707]: With varying frame amplitudes, the setting is made for the greatest amplitude. Service tasks after replacement of ICs 7705, or TUMOD: Purpose: Set amplifier control. Symptom, if incorrectly set: Picture jitter if input level is too low and picture distortion if input level is too high.
Electrical alignments VR120 GB 93 Deck electronics (DE) Service tasks after replacement of IC 7463: 8.5.1 Motor frequency - adjustment [2492] (OPTION): Purpose: To adjust the working frequency of the head motor driver (not necessary for M63100 BFP). Result of an incorrect adjustment: Head motor doesn’t start correctly.
GB 94 VR120 Electrical alignments Audio linear - ( AL) Service tasks after replacement of coil L5600, IC7004 or the audio heads: 8.7.1 Adjusting the erasing frequency [5600]: Purpose: To set the correct recording erasing frequency. Symptom, if incorrectly set: Erasing frequency or its harmonics cause audio faults.
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Electrical alignments VR120 GB 95 Determining the deviation (in ppm): ..measured frequency mess ..target frequency (8192,00 Hz) Deviation = 1x106 x (f mess fnom Determining the correction value for Step 53: Correction value = Deviation / 0.763 + 128 (round off to whole...
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GB 96 VR120 Electrical alignments Adjustment table of the clock frequency: Measured frequency in Hertz: measured measured clock corrected Time clock corrected Time frequency value deviation frequency value deviation pos. 7899-A for Step 53 minutes / pos. 7899-A for Step 53...
Circuit descriptions and List of abbreviations VR120 GB 97 9. Circuit descriptions and List of abbreviations Switched-mode power supply PS (PS Part) 9.1.3 Supply voltage part The supply voltage part extends from the mains socket 9.1.1 Technical data: [1300] to the capacitor [2318]. Using the diodes [6310, 6311, 6312 and 6313] the a.c.
GB 98 VR120 Circuit descriptions and List of abbreviations 9.1.5 Normal mode: followed by another start-up attempt ( Burst Mode ). The amount of power taken up from the mains in burst mode is low. With the power supply in normal mode, the periodic...
Circuit descriptions and List of abbreviations VR120 GB 99 9.2.1 Evaluation of the keyboard matrix Central Control AIO (AIO part) There are 12 different keys. Each key function is assigned a The microcontroller (µC) TMP93CT76F [7899-B] includes fixed voltage value. This value is decoded using an the following functions: analogue/digital (A/D) port (7899-B, pin 56).
GB 100 VR120 Circuit descriptions and List of abbreviations 9.3.3 CMT detection (video detection with CSYNC) The five-stage AGC alone cannot cover the large dynamic range of the input voltage. The amplifier is therefore also equipped with a low pass characteristic (fg = 3kHz typ.;...
Circuit descriptions and List of abbreviations VR120 GB 101 Comparator 4: In = FG, pin 35; Out = FGD, pin 30: 9.4.6 Interface to the capstan motor FG = capstan tachometer. This signal stems from an amplifier for the tachometer hall sensor on the motor unit The driver IC on the capstan motor is activated via connector [1946 pin 4].
GB 102 VR120 Circuit descriptions and List of abbreviations used to demodulate pos. or neg. modulated video carriers. It PAL/SECAM/MESECAM/NTSC via IIC bus is possible to generate a QSS-audio-IF signal or an intercarrier IF signal for demodulation in the audio SP/LP/SLP via IIC bus demodulator [7761].
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Circuit descriptions and List of abbreviations VR120 GB 103 • Y-REC path: The video signal passes via a 3.5 MHz low SECAM L pass filter to vertical emphasis comprising the YNR block The video signal (VREC) from the SE IC pin 32 [7004] passes...
GB 104 VR120 Circuit descriptions and List of abbreviations Chroma PAL 9.6.4 General This is first adjusted in the AGC stage to a constant level and filtered in the FM processing (PB-EQ). The signal exits the IC SECAM: on pin 18 [7004], and passes via an E-follower [7010] with Automatic cloche and anti-cloche comparison: During the drop (1.07MHz ).
Circuit descriptions and List of abbreviations VR120 GB 105 9.7.4 Audio linear playback 9.8.3 Audio HiFi recording During playback the switch [T7604, T7607] is controlled by The signal coming from the input selector switch (INPUT pin 99 and is closed. The playback signal from the head is...
GB 106 VR120 Circuit descriptions and List of abbreviations IN/OUT (IO part) 9.11 VPS/PDC, on-screen display (VPO part) 9.9.1 Video 9.11.1 VPS/PDC The entire video-I/O is carried out in 2-scart units using the The VPS and PDC data is either decoded by the VPS-PDC...
GB 110 VR120 Circuit descriptions and List of abbreviations 9.14 List of abbreviations Signal Description Application +5V analog in < 1W mode 5V_1WSTBY PS AIO1 AIO2 DE FOME +5V analog in STDBY mode 5V_STBY AIO2 DE VPO IO +5V analog...
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Circuit descriptions and List of abbreviations VR120 GB 111 Signal Description Application Composite sync pulse CSYNC AIO1 CTL1 CTL-Synch-1 CTL2 CTL-Synch-2 Audio switching voltage AIN1/AFV DECK_INIT Init switch AIO1 DRUM Head motor speed phase signal AIO1 Envelope comparator signal ENVC...
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GB 112 VR120 Circuit descriptions and List of abbreviations Signal Description Application Audio mute / Colour rotation on/off MTA_CROT AIO1 Frame pulse AIO1 PB-switch Head wheel position/-speed PG_FG AIO1 PGIN Scanner-Motor-Pulse PAL or secam-L AIO1 Record protection RECP AIO1 Red signal between scart 1/2...
Tape deck VR120 GB 113 10. Tape deck 10.1 Drive assembly Auxiliary tools for deck adjustment: This tape deck has three motors; one providing precision drive for the scanner unit; the second providing direct drive for the capstan and belt drive for the reel tables; the third motor drives the lift and tape threading/dethreading operations.
GB 114 VR120 Tape deck 10.1.2 Deck layout diagram Deck in position „threaded out“. The following diagrams indicate the relative position of the gearwheels and levers when the deck is in the threaded out (cassette-compartment down) position. Top view Pos. 46 Cam shaft Pos.
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Tape deck VR120 GB 115 10.1.4 Scanner replacement 10.1.6 Threading motor (Pos. 38) Removal: Remove the belt and disconnect the connector plug. Nylon gloves should be worn when handling the head disc. Remove the threading motor from the motor supports ( see Remove the deck from the set/mobo.
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GB 116 VR120 Tape deck 10.1.8 Pressure roller (Pos. 37) Remove the tape deck. Unhook and remove the pressure roller tension spring. Release the pressure roller guide (pos. 41) from the guide in the threading motor holder by pressing the top of the motor...
Tape deck VR120 GB 117 10.2 Adjustments Adjustment: Adjust the left and right roller units to make the tracking signal TRIV straight and flat as possible ( see figure 10-11 ). Adjustments must not be made in the service position.
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GB 118 VR120 Tape deck 10.2.3 Brake band and tape tension 10.2.5 Reverse brake control Due to further development it is no longer necessary to make Set the drive to „Reverse“ position. theseadjustments after replacement of the brake band. Place a torquemeter on the right reel and turn the latter If the brake band or tape tension are completely misadjusted, counterclockwise, until the reel just starts to flip.
GB 122 VR120 Tape deck 10.5 Mechanical parts list K I T S K I T S Code Code Pos. Description number Pos. Description number B I L P Q S T U 4822 B I L P Q S T U 4822 Rec.