Vhr310

SERVICE MANUAL

Video Cassette Recorder

VH R-31 O (New Zealand)

VH R-31 OIR (Ireland)

VHR-31 OEE (PAL General)

VHR-31 OPS (Middle East)

PAL

Please see other materials with Reference No. given intable below.

Table Caption: This table displays a list of reference numbers, labeled "Ieference Nc", with each reference number occupying its own row.

CONTENTS

Table Caption: This table is a table of contents for a technical manual, listing sections like disassembly, adjustments, and parts lists with corresponding page numbers. It also indicates that circuit diagrams are located in a separate volume.

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'RODucT 'AFETY 'OT'cE -

The components designated by a symbol ( ~ ) in this schematic diagram designates components whose value are of special significance to product safety. Should any component designated by a symbol need to be replaced, use only the part designated in the Parts List. Do not deviate from the resistance, wattage and voltage ratings shown.

NOTE:

1. Parts order must contain ModeI Number, Part Number and Description.
2. Substitute parts may be supplied as the service parts.
3. N. S. P.: Not available as service parts.

TEIINZ,IR,C,ME 14314285,84,90,86

REFERENCE No. SM531298

1. DISASSEMBLY

1-1. REMOVAL OF CABINET, MECHANISM UNIT AND MAIN BOARD .

REMOVING THE CABINET PARTS (Fig.1.1.1)

1. Remove the cabinet and bottom cover by removing the four screws (A) and five screws (B).
2. Remove the front panel by removing the locks of the clamps (C) using a screwdriver, etc.and slightly rotating the bottom part in the direction of the arrow.

Note: Electricaladjustments for the this model can be performed with only the cabinet removed.

REMOVING THE MECHANISM MAIN UNIT (Fig.1.1.2)

After removing the cabinet parts

1. Remove the two screws (D),and then remove the bracket.
2. Remove the 29-wire flatcable from the MC-2 PWB, and then remove the 8-wire flat cable from the VP-1 PWB Ass'y.
3. Remove the mechanism main unit by removing the two screws (E)and two screws (F).

Remove, as well, the two screws (G) at the cassette tray side while pressing the tray lock lever as shown in the enlarged view and pushing the cassette tray to the position where the two screw (G) appear.

REMOVING THE CP-1 PWB ASSEMBLY (Fig.1.1.3)

After removing the cabinet parts and mechanism unit:

1. PullouttheTM-1 PWBAss'yfrom CN301 and CN302 while pressing and spreading out the four clamps (H) as shown by the arrows.
2. Remove the two red screws (J).Next, remove the CP-I PWB Ass'y by Iif%ng itstraight up while pressing and spreading out the two clamps (K) as shown by the arrows.

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L

L

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TEMPORARILY SEITING UP AND CONNECTING MAIN PWB ASSEMBLY

The following is an example of how to place and connect the main PWB not requiring a jig,when repairing the CP-1 PWB assembly (Fig.1.1.4)

1. Place the mechanism main unit at the fixed position on the chassis.
2. Connect the 29-wire flatcable to the MC-2 PWB, and the 8-wire flat cable to the VP-1 PWB Ass'y respectively. Connect the TM-1 PWB Ass'y to operate VCR by using the remote control.
3. Place the CP-1 PWB Ass'y above the mechanism main unit along the cassette holder. Insert the tip (L) of the terminal board into the opening (M) at the side of the chassis, as shown in the enlarge view.

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1-2.MAIN CIRCUIT BOARD

2.ELECTRICAL ADJUSTMENT

2-1.SERVO CIRCUIT ADJUSTMENT

• . These adjustments should be carried out upon completion of the tape transport adjustments.
• . Ifthe tape transport adjustments (except the tilt adjustment) are carried out after these adjustments, follow the procedures again in Section 2-1-3. SWITCHING POSITION ADJ.
• When a cassette tape isloaded, auto-tracking will be set immediately after starting the first playback. As this will deviate the tracking center set,be sure to press the channel buttons (+)or (-)once directlyafterstarting playback to prevent auto-tracking from being set.

2-1-1. TEST EQUIPMENT AND STANDARDS REQUIRED

Table Caption: This table outlines the specifications for an oscilloscope and test tape, along with the type of blank tape required for testing. It details the oscilloscope's sensitivity, bandwidth, and the test tape's model, mode, and frequency.

2-1-2. LOCATION OF ADJUSTMENT POINTS

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'L

51-14285IN) 2/2

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NOTE

• Self-recording means 'Record any broadcasting or video signal and play back the just-recorded portion'.

2-1-3. SWITCHING POSITION ADJ.

Table Caption: This table outlines the procedure for adjusting the playback mode of a video output, specifying the measuring point, equipment, test tape, adjustment location, and the target adjustment value.

1. Set the tracking control position to the center by pressing CHANNEL buttons (+) and (-)simultaneously.

(Tracking center position display in the indicator panel 'T -:-')

2. Adiust VR351 (SW-P) so that the width 'T' becomes 6.5 H Y 0.5 H ss shown in Fig. 2.1.3.

2-1-4. STILL V-LOCK ADJ.

**Table Caption: This