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UESTION NO. P082103-2: Maxtor hard disk model 541dx 20GB, the bios configuration detects the hard disk type correctly, but when it shows the picture bios info, the system waits for the hard disk controller and does not detect the hard disk and shows a disk error.

1) Go to the Maxtor website & download a file called "dm8fix", copy to a diskette.
2) Create startup diskette(win98se works best).
3) Connect Maxtor hdd as single (master) on primary ide.
4) After booting system with startup disk (without cdrom support), insert second diskette & execute dm8fix.
5) When done re-boot with startup disk, partition & format drive as usual.
If this does not work, use third party program to run "low level format" on drive, and repeat steps 4 & 5.

QUESTION NO. P73103-3: I am trying to cross reference a component in a marine battery charger. It is a solid state three battery switching charger. The component I am trying to cross I believe to be a power transistor with a plastic package with through hole and a marking ok K2196. It also has a small symbol like a dual diode yet I can't cross this number to any transistor or diode. The pc board lists it as Q so I believe it to be a transistor.

This sounds like a Shindengen 2SK2196, N-channel Mosfet, rated 500 Volts, 20 Amps, 125 Watts. An IRFP460A or IRFP460LC could cross for this; Digikey ( lists both. An NTE2970 also might cross, but has a somewhat different case style.
K2196 is a 2SK2196 Mosfet by Shindengen. You can get the specs at You will probably have to find an original for this.

QUESTION NO. P32703-8: I need a sub for a diode on a treadmill. It is about quarter inch long and about one-eighth inch in diameter. Dark brown in color. On it there are three sets of lettering in white, and I can read most of it. They are C908, what appears to be BZV, an either 17C or 47C. Where it is mounted, the lettering DZ4 is screened on the board.

Diode Zener 6.2V, 5%,2.0W,BZV47C

QUESTION NO. P121302-9: RCA Direct TV receiver model DRD420RE. I need the values of R14113, R14103, R14110, R14112 CR14101, CR14102 and C14105.

r14113=100, r14103=2.4k r14110=22, 1w r14112=1k cr14101,cr14102 & cr14103 1n4148, c14105=.22 63v sm-r14115=5.1k sm-r14107=4.7k check cr14104,cr14108,cr14106,cr14105 & for sure q14100,q14101,14102

QUESTION NO. P60402-4: I am repairing a treadmill. Two diodes have been burned out. One has been referenced before on your site in question number P27-1. This diode is C15PH. The previous question provided an incomplete description resulting in an incomplete answer. The dimensions are leads .77OD; Body 2.53OD, 4.2L; It is glass and orange with a small silver stripe in the middle and a black stripe at one end (usually indicating a zener). I need the wattage and further info on this diode. The second diode is marked as such ST; BZV; 47C; 24; C848. ';' indicated separation between vertical lines of text on the diode. I believe it is a 24V power diode, but I am not sure. Its dimensions are Leads 0.81OD; Body 2.95OD, 6.18L.

The first diode is a Philips zener, from the "PH". The dimensions given match the SOD66/DO41 case of the Philips BZV85-C15 zener, rated 15 Volts, 5%, 1 Watt (Philips rates it for 1.3 Watts under special conditions). A 1N4744A zener might substitute. The second zener is an ST Micro zener, BZV47C24, rated 24 Volts, 5%, 2 Watts.

QUESTION NO. P27-1: Image 10.6 Treadmill. A diode, possibly a zener, is blown on a 2.5HP motor controller card. It has C15PH on its leaded body, however, the 1 may also be a capital I. I cannot find a match on this part number.

The 'PH' at the end indicates Philips, the manufacturer. In Philips' nomenclature, the C indicates a 5% tolerance, and the 15 indicates a 15 Volt Zener. You did not give the package style or its dimensions, so I cannot tell you which wattage (Philips family) this Zener is, since Philips makes Zeners in several wattages. It is a common manufacturer's practice for the marking code on a semiconductor to describe any of several devices, but which are in different packages, so that, in combination with the package description, the device is uniquely identified. If a package description is not provided, though, total identification is not possible. That is why it is always best to include a complete package description, when trying to identify a device from the marking code stamped on the body.

QUESTION NO. P1227-4: I repair low voltage equipment for a laser-tag centre. Over the years, the circuit boards have had many bad repairs done to them, and some of them are at the point where they have no solder pads left and many tracks burnt off. My problem is there is a 14pin header going to a 16x2 LCD and it hasn't got any solder pads left. The pin header moves around quite a lot and as a result, the wires replacing tracks and solder pads break off often and need to be resoldered. This also causes the packs to 'stall' and gradually causes other problems in other components. The boards are also through plated so they have tracks under the plastic of the pin header on the top side of the board and I cannot put wires under the pin header or it won't fit properly in the equipment. Is there ANY way I can replace the tracks and pads without wire? [We do not manufacture these boards ourselves and therefore complete replacement is costly.

Since these connect to an LCD, the currents flowing may be pretty small, in which case, you might try repairing the breaks in the tracks and pads with conductive ink, using a CircuitWorks conductive pen, or, if better gap-filling is required, you might try the CircuitWorks Conductive Epoxy.

QUESTION NO. P822-7: Miller mig welder, power comes on and the cooling fan runs but it will not weld or even spark when the wire is touched to the ground. I think I have found the problem, but cannot identify the part. It was made by the Gentron Corp. which is no longer in business or has changed its name. The label says sixpack powertherm with the #1ph dio brdg efg13a, it has four terminals ac1,ac2,+,-. it shows to have cont. between ac1 and the -.

From the information given, the part you are looking for is most likely a full-wave bridge rectifier. Not knowing the current the unit delivers for welding, any high current bridge should work given the output voltage is typically low on welders. You can test for the required voltage rating by disconnecting the leads ac1 and ac2 and measuring the ac voltage across these leads at the minimum and maximum settings of the welder. Just add 50% to the advertised current rating and highest measured voltage (safety margin) and find a source for a complete bridge or construct one out of separate diodes. NOTE The current capabilities of the bridge/diode assembly should be met first since the output voltage is most likely to be less than 100v (my arco mig welder output ~30 volts DC open circuit) and most diodes are rated at >100 peak reverse volts.

QUESTION NO. P725-4: Old metal "ringer" type telephone has no label as to the manufacturer, and I need some information to repair it. The jack for the phone line has two wires cut, a black one, and a yellow one. Coming from the power supply near the ringer, there are three wires of color sky-blue, grey w/red stripes, and grey which are also not connected to anything, but they have not been cut. I cannot figure out where the wires are to connect, if anywhere at all. The main problem to be solved is that the phone can receive calls, but it cannot dial out, it always gives a busy signal. I know that the destination for the call was not occupied at the time of testing.

You need to find the + to ringer, green is normally positive for telephone. Wire phone leads green positive, red negative. Does it receive calls? If yes, it probably needs to be rewired properly.

QUESTION NO. P65-3: 120VAC 3-way lamp dimmer is always full on. Suspect triac but need cross reference for cryptic label PH BT136 50CE 9422.

That number describes one of the BT136 family of Triacs, made by Philips (PH). There are many members to that family, but your suffix does not match any. Check if your number is actually BT136-500E, instead of 50CE. If yes, then this is a 500 Volt, 4 Amp, sensitive-gate Triac, and it crosses to SGS's T410-600T or Teccor's Q6004L3. If it is not BT136-500E, then go to, search on "BT136", and check the data on the many types of BT136, to find a match for yours.

QUESTION NO. P44-2: I need to identify the following transistor (or SCR??) so I can find a replacement or equivalent. It is the only semiconductor used in the fuel pump cutoff relay of a 1983 Honda Accord. It is marked NEC 5PIM 32. I contacted NEC and MCM and they could not help me.

I think you will find the marking is actually 5P1M. In the NEC nomenclature for SCR's, the first number is the average amps, the second number is voltage rating (in hundreds of volts). This would make your device's rating 5 Amp(avg.) [8 Amp(rms)], and 100 V. So try an SCR with 8 A(rms) or better current rating, and 100V or more voltage rating.

QUESTION NO. P1024-1: Car alarm with two black plastic transistors (power transistors) burned. The symbol is H2SB but I am not sure of number 2 because it is crashed wright there. These burned transistors are near other two one with code NEC D 882. I need the main characteristics (power or voltage,type- PNP or NPN...) of these transistors -H2SB 772P.

2SB772 (PNP) and 2SD882 (NPN) are NEC complementary transistors, with ratings of 30 Vceo, 3 Amps, 10 Watt, TO-126, pinout ECB. Mouser Electronics (800-346-6873;, among others, lists 2SB772 itself. Or, MJE171 is a possible sub.

QUESTION NO. P89-8: Looking for a cleaner for the conductive plastic contacts between an LCD display and PCB contacts for Eagle Sonar units.

The contact strips are made with graphite coated fibers aligned and en- capsulated in silicon rubber strips.The opposite ends that contact the lcd and pcb tend to get contaminated with what oozes out of the strip,this is especially aggravated if in a hot environment! Pull the strips and clean the pcb and lcd with denatured alcohol. Take the strip and clip it in one of the larger spring paper clips that has two wide parallel faces so only about 1/16 of the strip is exposed (using it as a tool to handle it with). Place a good bright light in front of the unit letting it reflect the sheen of the strips surface. Take a new single sided razor blade held at 90 deg to the strip make a surgical move left to right at just enough pressure to clean the surface. See the difference in the relection now. Flip the strip over and do the other side. Clean with denatured alcohol and a soft artist brush. DVM s Instruments all can be cured by this.

You can use 99% Anhydrous Alcohol if you are carefull and do not saturate the carbon interconnect. But be advised that the placement of the carbon/rubber part which connects the pc board to the glass LCD display "IS" critical for all functions of the display to work. Your problem may not be a cleaning, to interconnect may have become displaced. Try placing it a couple of times before using Alcohol. Why take a chance on ruining the interconnect if it is just an alignment problem?

QUESTION NO. P619-4: I need a cross reference number and manufacturer for SW12PCN075 8346 DO-5 package. It is from the DC exciter portion (115 volts) of our 600 volt reciprocating compressor motor.

SW12PCN075 is a 1200 Volt, 75 Amp, stud-mount rectifier made by Westcode; the 'N' indicates the normal (cathode = case) polarity. This rectifier crosses to NTE/ECG 6078.

QUESTION NO. P16-4: I need a replacement for this Power Darlington Embroidery machine transistor EC127D or Tosh - 2SD683 (TO-3) or another package type.

2SD683 is a fast-switching Darlington transistor, rated 400 Volts, 15 Amp, 150 Watt, with minimum gain of 500 at 5 Amps, Ton = 0.4 usec, Tstg = 15 usec, Tf = 3 usec. Techsonic ( is listing 2SD683 on their inventory webpage at http//

QUESTION NO. P92-3: I need a transistor, part number either 221-2 or 221-265-01 made by Motorola for a Zenith cable converter.

The 221 # is the Zenith Part Number and may be ordered from them.

QUESTION NO. P810-3: TRX-80 satellite receiver, when trying to move the antenna east or west the dish only moves a short distance then sends an error message. The voltage at the back of the receiver is 19 VDC instead of 36 VDC.

Check cable to dish. Check sensors in arm for feed back pulse.

QUESTION NO. P818-6: Echostar lt-8700 satellite decoder indoor unit. Problems in smpsu. Found s/c in U1 (CS3865C) but could not find replacement. Somebody told me it can be replaced with an equivalent IC but did not know name.

Cherry Semiconductor manufactures the IC CS3865-C; for the sales office for your area of the world, go to their website at In the US, CS3865-C is also stocked by Sager Electronics, their website at has an online catalog that shows both the DIP and SMD package forms of this IC available.

QUESTION NO. P46-6: Where can I obtain service manuals for APC power units? I have a unit 1250RM that keeps telling me to replace batteries, even though they have been replaced.

Regarding the APC UPS. APC will not provide service manuals since all repairs except battery replacements are done in-house. If after replacing the batteries you get the message to change them again, your UPS might need to be calibrated. For this you need the control software Powerchute+ (Ap9007 for Windows 95) sold for these units with an interface cable and to run the calibration test. The UPS thinks he still has the old batteries. Anytime we replace batteries on the Smart UPS series we have to do this procedure.

QUESTION NO. P35-8: Panasonic PT-106 3-gun projector. When switched on, there is the 15kHz whine but there is a visible spark in the red gun after about 1/2 second of power on. No heater glow in red gun but glow is present in the other two guns. However, no color can be seen from either gun. Switching inputs has no effect. Is there any way to disable the red gun so that at least I get a picture from the other two guns?

You can leave the crt pcb off and isolate the 2nd anode, but you probably have a shorted crt.

QUESTION NO. P113-1: Panasonic KX-TC280-B. The hand set has a component label as CF2 on the circuit board. I dropped the phone and messed up the piece. I presume it is for the frequency tuning. Where can I get the part?

CF2 stands for ceramic filter 2. The number on the filter is the mega Hz it operates at. You can get it from Panasonic or look for someone who carries a generic.

QUESTION NO. P824-10: Received a Philips Model CV2300 Cable converter that causes a hum or whistle at about 400 hz. This noise can be heard along with the normal sound and sometimes is very annoying to the customer. Unfortunately, my shop does not have cable facilities and the noise is not heard when using an antenna.

Your circuit is oscillating off frequency. Check all capacitors, you probably have a bad one.

QUESTION NO. P726-2: I am trying to repair an ultrasonic cleaner. Does anybody know about it?

These units are usually only some kind of oscillators with one or more Piezo-Elements as output. Frequencies varies around 35kHz. Should be no problem to repair.