JVC --------------------------------------------------------------- VIDEO KAMERA --------------------------------------------------------------- Model No.: GRAXM25U Fault: VIDIO IN CAMERA MODE LOOKED LIKE HEAVY FOG Remedy: CCD PLUG IN WAS LOOSE VERIFY BY PUSHING IN ON BOARD CAREFULLY PICTURE SHOULD APPEAR RESOLDER SOCKET AND ICS ON YB10197 (CCD) BOARD --------------------------------------------------------------- TV --------------------------------------------------------------- Model No.: 1 to 5 years old Fault: Intermittant loss of colour, pix, audio. Int dead, slow responce to commands acts like MPU is losing it. Also affects remote and keyboard functions Remedy: Check standby voltages. Pay specific attention to IC-101 [+9v], if it's output falls below 4.2v the MPU will not function correctly. This reg ic supplies power to quite a large portion of these sets. --------------------------------------------------------------- Model No.: 32750 Fault: relay click and go off sometyme relay doesnt work Remedy: c 926 1000mfd at 16volt become very warm. and the other cond, around. --------------------------------------------------------------- Model No.: AV-2651S Fault: Intermittent no vert. Remedy: Resolder vertical deflection output IC421. May have to scrape around pins as seating in factory partially broke the LAN/traces. --------------------------------------------------------------- Model No.: AV2781S Fault: Picture Bowed in on left & right (keystoning) Remedy: Looks like a bad yoke. Replace shorted Q553. (Base shorted to emitter). --------------------------------------------------------------- Model No.: AV-27CM3 Fault: Green in top of picture - Blurred/Washed out color Remedy: Found burnt leg on TH901 and burnt track. Replaced TH901 P-Thermistor and put jumper on broken ckt. track. --------------------------------------------------------------- Model No.: AV31BM5 Fault: Black screen,sound OK Remedy: Replaced comb filter --------------------------------------------------------------- Model No.: AV32020 And others Fault: insuffient pincushion correction Remedy: check and or replace capacitor c575 .o68uf/50v m.cap part #QFLC1HJ-683Z --------------------------------------------------------------- Model No.: C13WL5 Fault: Thin white line across screen, has sound. Remedy: If the problem is intermittant, i. e. picture comes back after tapping side, resolder solder connections around the vertical section. You should be able to verify this prior to soldering by pressing on the bottom of the circuit board around the vertical section. The picture should come back momentarily. --------------------------------------------------------------- Model No.: C-20CL3 Fault: No Pic/sound/filiments lit,thin red line . Remedy: R321 open(10 ohm@1/8W),C321 shorted(47uf@16V)3 ohm @2W on L side of flyback facing from back,open(no number on PC board). --------------------------------------------------------------- VIDEO --------------------------------------------------------------- Model No.: HR-759EK Fault: No Clock Remedy: 82OHM Resistor. Mounted under the PSU as a floater --------------------------------------------------------------- Model No.: HR-D210 Fault: Sound weak on own recordings Remedy: Bias level (TP31) too high adjust level with R41 for proper operation --------------------------------------------------------------- Model No.: HR-D455 Fault: Noisy pic. @ play; dark zones from tuner Remedy: Check power supply unit. Especially stabilising capacitor: C23! (also check C4, C5 & C10 for dry-up symptoms) --------------------------------------------------------------- Model No.: HR-D520/540 etc. Fault: acts as in pic. search when in play mode. Remedy: Capstan motor running too fast caused by a defective hall sensor. (located at edge of capstan disc) replace! --------------------------------------------------------------- Model No.: HRD540 Fault: DRIFTS OF TUNE Remedy: REPLACE Q2 2SD1207ST --------------------------------------------------------------- Model No.: HR-D540 Fault: NO SOUND ON PLAYBACK OR E-E Remedy: CHECK Q6 --------------------------------------------------------------- Model No.: HR-D540 Fault: OK-but no display Remedy: Check R21 (47 Ohm) in power supply --------------------------------------------------------------- Model No.: HR-D750 Fault: PSU dead but fuse not blown. Remedy: Glue on SMPS PCB has gone conductive, upsetting PSU IC. Clean it all off, spray with circuit board lacquer to protect. Should work OK now. --------------------------------------------------------------- Model No.: HRD-750 and others Fault: Failure of 15v zener diode on SW power supp. Remedy: Replace Q2 transistor on hot side of power supp --------------------------------------------------------------- Model No.: HR-D750 and others Fault: Loss of part of picture into noise bar. You have a 1 in 12 chance of getting a full picture! Remedy: If you scope the head drum feedback waveform, there will be an extra positive pulse missing, but the square wave is OK. The machine spins the drum at the correct speed, but does not know its position. Change 3.3uF/50V capacitor on drum motor PCB. --------------------------------------------------------------- Model No.: HR-D910 Fault: curls tape in rev-search Remedy: Change pinch roller --------------------------------------------------------------- Model No.: HR-D870 HR-D875 HR-D780U Fault: Power supply wont start up Remedy: Replace C 33 120mfd 6.3v 105 degree --------------------------------------------------------------- Model No.: HRDD848 Fault: dead Remedy: change caps 1u/50V in primar of power suply and seafty zener diode (57-60V)in output of power suply. --------------------------------------------------------------- Model No.: HR-D910EK Fault: Chews tapes and doesn't wind tape properly Remedy: Tighten belt with adjuster accessable from bottom of unit --------------------------------------------------------------- Model No.: HRDxxx Fault: When loading a tape, it only goes in 1/2 way, and ''buzzes'' then ejects. Remedy: Worm gear on right hand side of mechanism is dirty - clean . Also, check loading belt is good, also that all four screws that hold the mechanism in are tight. The loading motor may also be burned out . (this motor also controls mode switching) . --------------------------------------------------------------- Model No.: HR-DX62U Fault: Does not record audio, color noise on screen Remedy: Replace Q301, do nor SUB, in audio section --------------------------------------------------------------- Model No.: HR-J200U Fault: load tape auto eject. Remedy: 1. Belt that drives the tape wheels is not in place. 2. The tape-lift is not in place (gearwheels) 3. The modeslide switch is defect. --------------------------------------------------------------- Model No.: HR-J200 Fault: Loads then ejects Remedy: Check SW1 on the side of the cassette housing. Sometimes the switch is faulty other times it's not soldered parallel to the PCB. --------------------------------------------------------------- Model No.: HRJ630 Fault: DEAD BUT FUSE OK. Remedy: CHANGE R905 220K OPEN --------------------------------------------------------------- Model No.: HR-J600U Fault: Stuck in rewind Remedy: Replace end sensor, Q3 on Deck terminal PCB --------------------------------------------------------------- HI-FI --------------------------------------------------------------- Model No.: MX-1L Compact Compo Fault: Total power loss. Only a few leds a on. Remedy: There are two power supplies in this set. The lower one is the power supplie for the amplifier. Take the upper one, remove all the screws (4 pcs) and flip it over. Resolder all the connection, and it should work fine agein. This upper power supply is for the steering system, and security --------------------------------------------------------------- Model No.: All below RX515 Fault: Intermittant relay clicking. no sound. no relay activation. Remedy: Check grounds on main pcb. Run new wire grounds to all ground bus lines and then secure to chassis. --------------------------------------------------------------- Model No.: XL-F207TN Fault: no play or int play Remedy: replace flex cable to lazer. #EWR115N-11BB --------------------------------------------------------------- Model No.: RX517TN Fault: Blows Fuse. no power Remedy: check and replace main audio output driver transistors attached to heat sink, generally you will find a BASE-EMITTER dead short. ---------------------------------------------------------------