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MODELO: MX-TBN62
SERVICE
MANUAL
SPECIFICATIONS
GENERAL Portable 5.5"B/W TV-CD-Radio Stereo Entertainment System Power Source Battery 15.0V ( UM 1x 10 "D" Size ) FM SECTION Frequency Range . . . . . . . . . 88 - 108 MHz 30db S/N Sensitivity . . . . . 20 db Image Rejection . . . . . . . . . . 30db S/N Ratio . . . . . . . . . . . . . . . 50db AM SECTION Frequency Range . . . . . . . . 535 - 1700 KHz 20dB S/N Sensitivity . . . . . 68db Image Rejection . . . . . . . . . . 35db S/N Ratio . . . . . . . . . . . . . . . 35db TV SECTION CRT: 5" Receiver System:N/A System PAL-DK/I L-VHF:1-5 H-VHF:6-12 UHF:13-57 Resolution Horizontal . . . . . .300 Resolution Vertical . . . . . . . . 400 Videosignal :75 ohm INT. Telescopic ANT.
Weight . . . . . . . . . . . . . . . . . . . 3 KG CD SECTION S/N Radio . . . . . . . . . . . . . . . . 75dB THD . . . . . . . . . . . . . . . . . . . . . . 0.05%
MX-TBN62
LOCATION OF CONTROLS
1. CD PROGRAM BUTTON 2. CD SKIP-BACK BUTTON 3. CD-SKIP-FORWARD BUTTON 4. CD REPEAT BUTTON 5. CD-DISPLAY 6. CD PLAY BUTTON 7. CD STOP BUTTON 8. TV DISPLAY 9. RADIO TUNING CONTROL KNOB 10. TELESCOPIC ANTENNA 11. FUNCTION (RADIO/CD/TV) SWITCH 12. VOLUME CONTROL KNOB 13. CD-DOOR OPEN BUTTON 14. CD-DOOR 15. RADIO/TV DIAL SCALE
16. RADIO/TV BAND SELECTOR SWITCH 17. DC-JACK (13V, 1300mA ) 18. BATTERY DOOR 19. SYSTEM POWER/ RE-CHARGE SWITCH (ON/ OFF/ CHARGER) 20. TV-VERTICAL HOLD CONTROL 21. TV-BRIGHTNESS CONTROL 22. TV-CONTRAST CONTROL 23. AUDIO-IN JACK 24. VIDEO-IN JACK 25. AV-SELECTOR SWITCH (TUNER/AV-INPUT) 26. EXTERNAL TV-ANTENNA JACK 27. HEADPHONE (EARPHONE) SOCKET
TUNER ADJUSTMENTS
AM ALIGNMENT
Step 1 2 3 4 5 Alignment IF Calibration Tuning Range Calibration Adjustment of Tracking Frequency Tuning Dial of signal Adjustment Generator setting 455KHz IF Calibration 525KHz Low End AM OSC,T2 1720KHz High End TC1 600KHz 600KHz Bar Ant. L5 1400KHz 1400KHz TC2 Repeat the above adjustment Remarks Maximun Maximun Maximun Maximun Maximun output output output output output
FM ALIGNMENT
Step 1 2 3 4 5 Alignment IF Calibration Tuning Range Calibration Adjustment of Tracking Frequency of signal Generator 10.7 MHz Tuning Dial Adjustment setting Low End T1 Remarks Max gain and Symmetrical "S" Curve Maximun output Maximun output Maximun output Maximun output
87.5 MHz Low End L2 108.5 MHz High End TC3 90 MHz 90 MHz L1 106 MHz 106 MHz TC4 Repeat the above adjustment
ALIGNMENT OF TAPE SECTION
HEAD ADJESTMENT 1. 2. 3. Connect a VTVM to the Jack. Use a 4 ohm dummy load when the VTVN is plugged into the Headphone Jack. Playback a 6.3 kHz test tape ( MTT-113 ) and turn the Azimuth screw to obtain the maxim output of the left and the right channels. When the output level of the left and the right channels differs, adjust the screw until both channels at the same level. After adjusting, fix the Azimuth Adjusting Screw with glyptal paint or "screw lock."
4.
FM STEREO ADJUSTMENT 1) Connect a frequency counter to test points on the Main P.C. Board. 2) Band selector Switch : FM Position. 3) Adjust VR1 on Printed circuit board so that the Counter indicates 38.0KHz + 100 Hz (37.90 KHz to 38.10 KHz ). REMARKS : 1) When aligning FM IF , the symmetrical curve may not be obtained by setting the marker of the Sweep Generator (10.7 MHz ). This is due to the ceramic filter used in the until. Regardless of the marker, align the curve as symmetrically as possible with peak output. 2) When aligning the Tuning Range and adjusting the Tracking , proceed with alignment in a sequence of FM - AM 3) Use a screwdriver with a plastic grip for all alignments .
SCHEMATIC DIAGRAM
SCHEMATIC DIAGRAM
ADJUSTMENT POINTS
P.C.B. DIAGRAM
P.C.B. DIAGRAM
P.C.B. DIAGRAM
SCHEMATIC DIAGRAM
WIRING DIAGRAM