Sanyo VHR-28 Series Service Manual Download | Manualshive

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Summary of Contents for VHR-28 Series

Page 1: ...ADJUSTMENT 1 2 ELECTRICAL ADJUSTMENT 2 1 Preparation 2 2 2 SERVO CIRCUIT ADJUSTMENT 3 2 3 VIDEOCIRCUIT ADJUSTMENT 5 2 4 AUDIOCIRCUIT ADJUSTMENT 7 2 5 LEVEL METER CIRCUIT ADJUSTMENT 9 2 6 MTSDECODER CIRCUIT ADJUSTMENT 10 2 7 VIDEOTEH DECODER CIRCUIT ADJUSTMENT 11 2 8 TUNER lFCIRCUIT ADJUSTMENT 12 3 DISASSEMBLY PROCEDURES 3 1 REMOVAL OF REMOTE CONTROL UNITCASE 13 L FP4H FP4HV series REFERENCE No WM ...

Page 2: ... NICAM decoder VHR 2901R 290ES 291 E 29SP and 280 New Zealand TM 6 Videotext decoder VHR 294G and 29SP TM 8 VPS circuit board VHR 284G Appearance and specifications are subject to change without notice Fig 1 1 1 2 LOCATION FOR TAPE PATH ADJUSTMENT NOTE Test point TP182 and TP183 for tapa path adjustment is shown in figure below For adjustment refer to the separate volume Mechanism Sewice Technical...

Page 3: ... Bracket of the Pre amo unit to maintain the shield effect Relay jig VHJ 0088 22 wires cable for AD 2 board Connect the Flat cable end to CN251 of the CP 1 board and other end to CN271 of the AD 2 board using the Relay jig Shown in Fig 2 1 2 to provide simple repairing and adjustment of the AD 2 board Relay jig Flat cable Slinder assembly PlaJo35 a I 1 W Erracket Fig 2 1 1 RMJol 4 I Fig 2 1 2 L 2 ...

Page 4: ...F switching pulse Vtdeo signal 7654321 V sync 1 Press the tracking buttons and simul taneously to the tracking center position in dicator panel displayed T 2 Adjust VR351 so that the phase of the lead ing edge of the vertical sync signal is delayed 6 5 t 0 5 H from the rise of the RF switching pulse waveform W20S011 Noise at upper side m 1 2 3 4 5 6 w de Set the VCR in the SP REC mode and record a...

Page 5: ... the position of the noise at the upper side of the screen to the similar position of the one at the lower side judging from the center of the screen Press the REC button during the tracking center display approx within three seconds at this time make sure that display as shown T Note Skew may occur at the upper side of the playback monitor screen during the LP mode do not mistook this for noise P...

Page 6: ...R102 VR101 VR103 VR104 Remark W25V03C T 100 white L 4E 1 Terminate VIDEO OUTPUT terminal with a 75 ohms 2 Adjust VR102 so that the level is 0 50 0 025 VP P W25VO01 1 tXIO white 0 05 Vp p 1 Terminate VIDEO OUTPUT terminal with a 75 ohms 2 Adjust VR101 so that the level is 1 00 0 05 Vp p 1 2 3 Input the PAL colour bar signal to VIDEO INPUT terminal Set the channel selector buttons to the AV position...

Page 7: ...hield case TP181 REC CURRENT Remark W15vcm f 155 5 mVp p 1 RotateVR182 so that the luminance level is minimize 2 AdjustVR181 so that the signal level is 155 5 mVp p W25V028 7 520 20 mVp p lL IL 1 H sync H sync 1 Connect the ground of the oscilloscope to the Shield case of Video pre amp L 2 Set the channel selector buttons to the AV 3 AdjustVR182 so that the signal level at the 1 P08v03 VR181 VR182...

Page 8: ...he remote control unit STEREO mode SP LPselect button onthe remote control unit SP mode REC LEVEL control except VHR 2901R VHR 291 E Center click stop position c REC BALANCE control except VHR 2901R VHR 291 E Center click stop position TB 1 board I r _ _ 7 1 TB 2 board 00 TP101 VIDEO OUT RF converter I 1 1 cz _________ 3 L _ _ _ J VR201 _m VR 102 1 I IC201 BIAS AGC VIF unit t r e a R M L _ _ _ _ J...

Page 9: ...re mote control unit Playback the alignment cassette and observe the waveform on the audio output Adjust VR239 until the noise component of both channel is minimum level Audio signal 5 KHz 17 dBm from Audio signal generator 1 Adjust VR243 so that the output level is minimum 2 After this adjustment be sure to readjust step 2 A FM BPF TP243 1 Press the Auto tracking button on the re mote control uni...

Page 10: ...terminals 2 Press the 0 AV button on the remote control unit to the AV position 3 Press the AUDIO output button on the re Audio signal AUDIO VR241 mote control unit to the Stereo mode AUDIO 1 KHz 7 OUTPUT L ch 4 Set the REC LEVEL control to the center 1 LEVEL dBm from E E L ch R ch click stop position not necessary for METER Audio signal terminals VR242 VHR 2901R generator Rear panel R ch 5 Adjust...

Page 11: ...1 pin 6 Location VR631 adjustable through CP 1 board VR632 Remark 1 Set the pilot signal for the stereo mode With the L ch unmodulated provide 1 KHz 100 modulation on the R ch 2 Connect an oscilloscope to the audio output terminal L ch and adjust VR631 for mini mum waveform peak to peak value 1 Select the TV channel to stereo program me 2 Adjust VR632 so that the waveform is max imize 1 Select the...

Page 12: ...of QI012 CP 1 board Fig 2 4 1 PI Oxm Remark 1 2 3 4 Set the varticai scale VOLTAGE DIV of the oscilloscope to 10 mV DIV Connect the frequency counter to Emitter of Q101 2 and ground through a pre amp of the above oscilloscope Press the MENU button on the remote control unit After the frequency off by turning CT771 for moment Adjust CT771 so that the fraquen cy is 4433619 t 50 Hz Fig 2 7 1 TM 6 boa...

Page 13: ...nd slowly turn VR61 1 from the point where snow noise is 1 RF AGC IV E E TV screen VR611 present to the point where it just disappears broadcast VIF unit from the monitor TV 2 Confirm by monitor w that there is no beat and saturation S N is best point when re ceiving any TV channel VR611 r 7 RFAGC u Ic 611 ard Po3uw Fig 2 8 1 VIF unit Parts side view 12 ...

Page 14: ...4 5 6 Fo7aool Edge Bottom case Make a sDace Battery f compartment Upper case Fig 3 1 1 B m7aoo3 a GUITERPICKor Thin plastic piece Fig 3 1 2 Make a space B r ER ye Hooks F Bottom case Upper case Fig 3 1 3 To make this procedure easier push the remote control unit end C against your body Fig 3 1 4 Insert the GUITER PICK above mentioned into the space B as shown in Figs 3 1 3 3 1 4 and move the PICK ...

Page 15: ...Mar 92 57OO HA Printedin Japan SANYO Electric Co Ltd Osaka Japan ...

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