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We provide this page to assist you in using or replacing your product. Repair and calibration agreements and per-incident services are available from Keysight Service Centers. All functions tested operate normally. Comes with 30 ” The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. All functions tested operate normally. Comes with 30 Day Right of Return if not 100 Happy with your purchase. None of which effect the items functionality. ”. Something went wrong. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Something went wrong. View cart for details. These are purely cosmetic.User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. View cart for details. All functions tested operate normally. Comes with 30 ” Learn more - opens in a new window or tab This amount is subject to change until you make payment. For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab This amount is subject to change until you make payment. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. All functions tested operate normally.
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Comes with 30 Day Right of Return if not 100 Happy with your purchase. None of which effect the items functionality. ” Contact the seller - opens in a new window or tab and request a shipping method to your location. Please enter a valid postal code. Please enter a number less than or equal to 1. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Ac Voltage - TB-9-6625-2135-350016 Table 9. Ac Voltage - continued - TB-9-6625-2135-350018 Table 9. Ac Voltage - continued - TB-9-6625-2135-350019 Dc Current - TB-9-6625-2135-350020 TB-9-6625-2135-35 Digital Multimeter Hewlett-Packard Models 3465A 3465B and 3466A Manual Design by Strategico. DCV, ACV, DCI, ACI, R, Diode Test, dB, dBm, dBV. DCV 200mV to 1000V Full Scale, ACV 200mV High speed (34 ms) This 3467A Logging Multimeter AC,DC Volts to 1000V, AC, DC Current to 2A, KEITHLEY 160 DIGITAL MULTIMETER DIGITAL MULTIMETER Test Equipment:Meters, Measures DC With PC-Control. Analog Meter in Watts and dBm High speed at 9 ms typical Test voltages 1.5, 50 and 500 Volts 0.2 ohms to 10 m With Combicell Temperature With Temperature-control-unit. THERMISTOR MOUNT 10-MHz AC Voltmeter AC Line and Battery operated. Twelve ranges 1 mV full scale to 300 volts DC Volts, AC Volts to 1MHz. 0.1V, 1V Power capacity: 80 watts. A full invoice should be emailed to the winner by the auctioneer within a day or two.We will provide weight and dimensions after packaging. Other fees may apply. The Buyer's Premium is a percentage that is added to the final purchase price of any item. Webcast bidders will be charged a 13.5 Buyer's Premium.Goods weighing more than 100 pounds must be removed by a qualified, insured rigger. No returns or refunds will be permitted, unless authorized by the seller in writing. All buyers shall rely solely on their own investigation and inspection of any Goods.The headings contained herein are for convenience only and shall not limit or alter the Terms hereof.
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Heavy equipment may be operated and electrical circuits may be live. Every person enters the auction site at his or her own risk with notice of the condition of the premises and the activities that will be or have been conducted on the premises.Getting notified via SMS Text Message will require you to verify your cell phone via the profile page in your account. It is also available in a wide range of types and specifications. Customers' diverse needs can be fully fulfilled. HoldPeak's multimeter tester series include multiple types.HoldPeak carefully selects quality raw materials. Production cost and product quality will be strictly controlled. This enables us to produce multimeter tester which is more competitive than other products in the industry. It has advantages in internal performance, price, and quality.It has protective ribbed sides, which makes it easy to hold.
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Starting at 0V on the Variac and ramping up slowly, I get to about 35V and the current is already measuring 100mA. The fault condition must still exist. Sure enough, there is a group of six diodes surrounding four capacitors, and five of them measure as a dead short. That’s 0.0V on the diode-test range, both ways. Now they test OK, out of circuit. I removed another pair and they test OK as well. Checking across the now-empty diode pads with an ohm-meter shows that the short (or shorts) still exist on the board somewhere. Next item in the probability-of-failure category: capacitors. And 3 out of 4 of them measure as dead shorts. All three are 0.2 ohms or less. This is an unusual failure mode for electrolytic capacitors in my experience, but the ohm-meter does not lie. All four capacitors get replaced.In fact, experience has proved that AC or DC current measurements are not strong points for either the 3468A or 3478A. One of them is 4-wire resistance measuring capability. Using separate source and sense test leads nullifies the test lead resistance, and allows for very accurate measurements below one ohm. The easiest way to perform a 4-wire measurement is by using Kelvin clips, as shown in the photo at right. At this resolution, temperature effects on the resistance value are readily apparent. It was reading a few counts high, I just put my fingers on the resistor for a few seconds to warm it up a bit. ?? The lowest AC current range on the 3468A is 300mA. Neither restriction is satisfied in this case, so we’re lucky that it even reads this close! You must have been reading my mind. However thanks for the detailed photos! Feel free to come back and add links to your work. Great score and a clever repair to boot. Since they were shorted by the caps, no current should have been flowing through them at all. But the rest of the caps are automatically suspect. Next order of business though will be to replace the 3.0V lithium battery. Don’t want to lose the cal constants.
http://garrisonjazz.com/images/brother-750cw-manual.pdf
And as well that the 2 lowest ranges are keeping the last measured voltage until I short the test leads. This occures event after switching to another range but this is not a huge problem for me. The 2 lowest ranges have an input impedance of over 10 Gigohms. The inputs can build up a charge just from noise, in addition to the last measured voltage. With such a high impedance, there’s just no way to dissipate the charge until you cross the leads, or connect to whatever you want to measure. While I fully understand and appreciate the beginner aspect of Martin’s videos and learning by making mistakes, I still see no reason to ruin a new instrument.I would trust mine more than most any new cheaply-made gadget, no matter how many digits it has. The biggest fault with this unit, is the inability to “zero out” test lead offsets. Not really a fault, just an inconvenience. Great article, btw. DMMs generally have a very high CMRR, such that stray noise is not problem for DC measurements of relatively low-impedance sources. I do find that for resistance measurements over say about 500K, the shorter the leads are, the better. It’s still working and precise ??, the other one I found in Larry Atherthon’s auction on ebay, recently. It’s refurbished and NIST calibrated. My old one has Battery Option, but in meantime without battery because in Switzerland I couldn’t find a replacement battery so far. Because the C702 next to the 7915 (U702) had short circuit fault, also the 33V Zener diode CR749 was broken. Short circuit, too. So the output of the 7915 had -0.6V instead of the expected -15V. I didn’t have correct replacement parts at home, so I used similar ones for a short test. After power up, the DMM shows “Self Test OK”. DC and AC voltage functions are working great. ?? I ordered the correct replacement parts and I’ll have an additional well working DMM, soon. Oh, in meantime I also cleaned the case. It was very grubby ??
But the ferrite core of the Transformator T901 is broken. It’s a hard-to-find PT 2318 type. This is because the PT 2318 isn’t recommended for new designs. I don’t know if there is a replacement available:(. The DMM itself powers up and shows “Self Test OK” normally. DC functions are working well, but AC functions didn’t show any reaction. The output at jumper 302 showed -1.77 V, ten times less than the DMM reading. So I removed the AD536. I’m waiting on the replacement AD536 and the tantalum capacitors C304, C306, C308 and C309, which I want to replace, too. Afterwards, I’ll have another well-working 3468 ?? It was worth money and time ?? I found there is a 2A fuse in series with the lead acid gel cell, so that being blown, the battery and its charger are effectively out of the circuit. Frankly, I did not notice the lithium cell at all when I had the set opened up, so I didn’t check its voltage. As long as that fuse is blown there is no consequence from the shorted battery, just no battery operation. Thinking about it, after reading the SM once, I find there is a 400 mA. Full Rate charge to about 7.1 volts on the gel cell, and a trickle charge of 130 ma.Together, those would have a capacity of about 5A. vs. the gel cell’s rated 3.2A. (or 3.5A, for the newer gel cells).Maybe not now, but it could be something to play with. Manual Part Number: 03468-90008. Revision Date: September 1988. HP References in this Manual. This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-. Packard's former test and measurement, semiconductor products and chemical analysis We have made no changes to this For example, model number HP8648A is now model number Agilent 8648A. About this Manual. We’ve added this manual to the Agilent website in an effort to help you support your It may be incomplete If we find a better Support for Your Product. Agilent no longer sells or supports this product.
www.csnjl.com/userfiles/files/canon-irc-2105-service-manual.pdf
You will find any other available Search for the model number of this product, and the resulting product page will guide Our service centers may be able to perform calibration Agilent Technologies Number Prefix 2231. Refer to the. Backdating Section (Section VII) of this manual to adapt it to earlier Section I, II, III. General Information. Installation Section IV. Performance Test Section V. Replaceable Parts. Section VI. Backdating Hewlett-Packard Company Section VII. Service. Manual Part No. 03468-90008. Microfiche Part No. 03468-99008. Appendix Printed in U.S.A. U0988. WKSl HEWLETT Herstellerhescheinigung Manufacturer's declaration. This is to certify that the equipment Additional Information for Test- and Measurement Equipment Interference Limits are still met at the border of his premises. HFWI ETT-PACKARD MAKES NO WARRAN l Y OF ANY KIND WITH REGARD TO THIS MATERIAL. IN-. CLUDING, ItUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS Hewlett-Packard assumes no respon.sibility for the use or reliability of its software on equipment that is not furnished This document contaitis proprietary information which is protected by copyright. All rights arc reserved. No part of Whp HEWLETT Hewlett-Packard Com- This is a Safety Class The power cable must either be plugged into an The power jack and Operation of any electrical instru- Component replacement and internal adjustments must Do not replace components with power cable connected. Under To avoid injuries, always Return the instrument to a Hewlett-Packard Sales and Service Office for service If necessary, return the instrument Symbols Used On Products And In Manuals. AC line voltage input receptacle. Instruction manual symbol affixed to product. Warns and cautions the user Indicates dangerous voltage — terminals connected to interior voltage Protective conductor terminal. Indicates the field wiring terminal that must Clean ground (low-noise).
Indicates terminal that must be connected to Frame or chassis ground. Indicates equipment chassis ground Affixed to product containing static sensitive devices - use anti-static I. GENERAL INFORMATION I-l. I-l. Introduction 1-1 Calibration 1-1 Identification 1-1 Section Page Selection 2-1 Temperature 2-4 Repair 2-6 Section Page Page Messages 3-8 Section Page Temperature) 4-4 Tests 4-11 Page Section Page Section Page No. 2137A03600 and Below) 6-1. No. 2137A05980 and Below) 6-1. Section Page Page Replacement) 7-1 Service Group Page C. OHMS TROUBLESHOOTING...7-C-l. TROUBLESHOOTING 7-D-l F. THEORY OF OPERATION 7-F-l. G. SCHEMATICS 7-G-l TABLE OF CONTENTS (Cont'd) Connection 3-3 Connection 3-3 Comparater 7-D-7 Figure Page Switching Circuitry 7-F-4. Input Amplifier 7-F-5 Circuitry 7-F-l 6 Battery Charger 7-F-21 DC to DC Converter 7-F-23 To avoid elec- The manual is design- Other users This manual is Operators Manual. Procedures are in Section IV. The Required Equipment. Table and an abbreviated specification table are also in- Theory Of Operation, and Schematics are in Section VII. The troubleshooting information is in the form of Ser- G (last group). HP-IL (Hewlett-Packard Interface Loop). The multimeter is excellent for Other features are Autozero (for Display. No mechanical adjustments are necessary to calibrate the Hewlett-Packard An -hp- assigned alpha character between the prefix and Table 1-1. Specifications In dB, with IkO imbalance in Lo lead. AC rejection for 50. Input CharnetiriitiGi. Maximum. Reading. Rttolutioi. Range Input Rutittunea. Maximum Input Vultaga; (non-destructive). Hi to Lo: 301 Vrms or 450V peak. Mnaauramant Accuracy. Auto-zero ON Range The Cal. Temp. (Calibration Temperature) is the temperature Autu-Zarn Dff. Frequency Aute-Zere Off. Crest Facter. Cnmmon Made Rejectien. First reading is correct within 70 counts of final value, when on For 50 or 60Hz operation, auto-zero ON or OFF. Input Characteristics. Input Characteristics. Range.
Reading Resolution Input Impedance. Table M. Specifications (Cont'd). DC CURRENT (Cont'd). Auto-Zaro Off. Tampirtturt Coafflcltnc Same as dc volts. AC CURRENT (true rms responding). Input Charactariatici. Raading SK Digit. Raaolutian. Vft Digit Maximum Input: (non-destructive) Fraquency. Ranges Maximum Raading Rataa. Same as ac volts Humidity Range. Storage Temperatura. Warm-up Time: Integration Time. Number af Digits. Lins Frequency Power. AC Line 48-440Hz; 86 -2 BOV, (see configuration). Battary: (Option 001). Rechiargeable lead-acid; minimum continuous operation for Maximum Powar: The instrument contains CMOS Integrated. Circuits which are susceptible to failures due Continue with step e. Then remove the two rear feet. To remove a foot, Then lift the Figure 2-2. 3468B Bottom View. Figure 2-3. Top Cover Removed (Model 3468A shown) Note that the cable is plug- It is located If the jumper has Set the bottom assembly aside. Then install The line voltages and cor- To prevent leakage paths on the main printed Jumper Line Voltage Loosen and Then reinstall the inner shield and the shield mounting Figure 2-5. Power Line Voltage Configuration It is important that the Frequency Table 4-2. Recommended Test Equipment. Instrument. Critical Specifications. Recommended Model. Digital Voltmeter. Range: 300mV to 300V Voltage:300mV to 300V. Systron Donner Model Ml 07. AC Calibrator. Frequency: 20Hz to 300KHz. Fluke Model 5200A DC Current:! A. Valhalla Model AC Current: 1 00mA to 1 A Resistance. Guildline Model. Standard. Resistance: 1 00 ohm HP-IB Capability Analyzer. HP-IB Control Capability Bandwidth:DC to 100MHz Voltmeter is an -hp- Model 3456A. The critical re- Source. The critical requirements are as follows: Calibrator. If the calibrator is not available, use a It is suggested to acquire the Calibration. The Standard Resistors Use the Guildline Use the Guildline AC-DC Current Calibrator as the current source, a.
www.cruiseride.com/userfiles/files/canon-ir8500-ir7200-service-manual.pdf
Digital Voltmeter for the standard, and a DC Volts Stan- The following The Valhalla Model 2500 The critical Voltmeter is an -hp- Model 3456A. Refer to paragraph Voltage Source. Refer to paragraph 4-9 for the critical AC-DC Current Calibrator as the current source and an. AC Calibrator as the ac standard. The following The Valhalla Model 2500 The critical Refer to paragraph 4-1 1 The test limits and set- If only one range fails, calibrate only that range, other- If the failure can- These specifica- Bureau of Standards will be covered in a manual change The specifications listed Within each group are either one, two, or three main sets They also de- The 24 hour limits They are specified as a percentage of the reading and an For example, the Range (in the 5 Digit Display mode) is: Digit Display mode is selected, the percentage is the same For example, the percen- Temperature Coefficient (listed in Table 1-1) must be add- It is recommended A Voltmeter Since voltmeters (or even Make sure the If the standard is.001 If the standard Although in both This creates an. Ambiguous Region, shown in Figure 4-1. The region gets The best test To prevent leakage paths on the main printed Refer to Figure 5-2 and locate screws lVIP3. Loosen all The screws are held in the Then place the top Once the board is removed, remove the battery Then remove the inner MPl 1 from the A1 assembly (main printed circuit board). Set the bottom Then unplug the wires from MP17 from the A1 assembly. Remove the front panel The instrument is now S-16. 3468B Disassembly Refer to Figure 5-10 and locate the two rear feet (MP8) To remove a foot, lift up the The screws are held in the Then place the top assembly Disconnect the wires from Once the board is removed, remove the battery Unplug cable W501 from Loosen and remove screw. MPll from the inner shield (MP12). Then remove the Loosen and remove screws. MPl 3 from the A1 assembly (main printed circuit board).
Set the bottom Unplug cable W501 from the Then unplug the wires from Loosen and remove screws. MP20 from the A1 assembly. Remove the front panel The instrument is now Table 5-3. Replaceable Parts. Reference. Designation. HP Part. Number Description. Mfr. Code. Mfr Part Number RVlOl and HP part number 1970-0090 (630V) is used for El 01. Table 5-3. Replaceable Parts (A1 Cent.). Mtr. Mfr Part Number For serial numbers below 2 1 3 7 A 1 1665 (HP 3468 A) or below 2231 A02326 (HP 3 46 8 B): Cl 04 is used in place of RV 101 and HP part Table 5-3. Replaceable Parts (A1 Cent.). Mfr Part Number Table 5-3. Replaceable Parts (A1 Cent.). Description Code. Mfr Part Number For serial numbers below 2 1 3 7A 1 1665 (HP 3468 A) or below 223 1 A02326 (HP 346813): Cl 04 is used in place of RV 1 0 1 and HP part Table 5-3. Replaceable Parts (A1 Cent.). Mfr Part Number The following If this test This test shows that the. Main Controller’s (U501) RAM has failed its internal self To make sure U501 is the cause, go to Service Group D, This indicates that the Go to Service. Group D, paragraph 7-D-24, for further troubleshooting. This shows that. Troubleshooting) for troubleshooting. Table 7-1. 3468A1B Service Groups. Sarviee. Group. Title The rest of the The Service Groups A). Typical DC Volts and DC Current Failures are. Overload, Inaccurate, Constant Zero, Floating, or Noisy. Readings. Troubleshooting information for these failures Inaccurate readings are nor- Therefore, the full scale and A constant zero reading It can also be caused if no B). AC Volts and AC Current Failures can be Overload. Inaccurate, Floating, or Noisy Readings. Troubleshooting Before going to the service group, check and make sure The following explains the AC. Volts and AC Current Failures. Inaccurate readings are nor- Converter. Typical Ohms. Failures can be Overload, Inaccurate, Floating, or Noisy. Readings.
Troubleshooting information for these failures The DC Volts and DC Cur- Failures are explained as follows: Inaccurate ohms readings can Make sure the DC. Volts Function is operating correctly (go to paragraph A constant zero reading The failure can also be caus- Converter and the Input Circuitry. Since this is not an Logic Failures Calibration RAM (CMOS RAM), Processor RAM, and. HP-IL Failures. Go to Service Group D, paragraph The following This is most like- An Inoperative Display is. This can be caused by the display itself or the Main Con- An Inoperative Keyboard is A failure caused by the. Control ROM normally shows up as “ERROR 4” (after. The ROM (U502) itself can be On Failure. This failure shows up as The RAM (U509) itself can This failure is most like- Circuitry. Converter itself or the Main Controller (U501). Go to Ser- Readings. Any one of these failures can be caused by the. Since both cir- This failure can be caused Since the Input. Hybrid receives its set-up information from the Main. Controller, the controller can cause the hybrid to fail. E). Service Group E has some information on how to. Circuitry, and the optional Battery Charger Circuitry. Title Paragraph. Introduction 7-A- 1. Pre-Troubleshooting Information 7-A-3. DC Volts Troubleshooting 7-A-5. Overload, Floating, Constant Zero (with input ap- Constant Zero Readings (with no input applied) on. All Ranges 7-A-9. Overload, Constant Zero, Floating, or Noisy. Readings on Some Ranges 7-A-ll. Inaccurate Readings on All Ranges 7-A-17. Protection Circuitry Troubleshooting 7-A-19. Input Circuitry Troubleshooting 7-A-21. Overload Readings on All Ranges 7-A-23. Constant Zero Readings on All Ranges 7-A-25. Floating Readings on All Ranges 7-A-27. DC Current Troubleshooting 7-A-31 The Service Group is symptoms oriented (i.e., what fails) The instrument contains CMOS Integrated. Circuits (e.g. U102) which are extremely It is especially important that grounded tools Schematic 4). Power. Checked. Voltage.
Supply Level Jumper -f 5 The -I- lOV supply can be To determine the inoperative circuitry, do the procedure Service Go to Ser- Go to Service Group D Go to paragraph 7-A-21 for troubleshooting. All Ranges If the relay is turned on in the.3V and 3V Ranges, U102 Readings on Some Ranges The hybrid is also used to Because of this, a relay or U 102 can make certain ranges Since the feedback circuitry is in U 102, the hybrid is most The most likely cause Amplifier is open. Check for the following: If KlOl is If not, U102 may be U102 may be defective. If K102 is If not, U102 may be U102 may be defective. UlOl and then U102 if noise is noted on some ranges. This is because the. Inaccurate readings can be caused If the ranges Go to paragraph 7-A-5 This can be Do the following: Replace U102. Using the test. UlOl. Replace U102. Replace UlOl. If no shorts UlOl pin 3 (U102 pin 10). Autozero off, the Input Hybrid is defective. Replace. U102. If the reading is still noisy, continue with the next Terminals. If the voltage DC Volts Failures. If the DC Volts Function is good, the Make sure FlOl and R107 are Title Paragraph. Introduction 7-B-l. AC Volts Troubleshooting 7-B-3. Overload, Floating, or Noisy Readings on. All Ranges 7-B-5. Inaccurate Readings on All Ranges 7-B-8. Overload, Inaccurate, Floating or Noisy Readings AC Current Troubleshooting 7-B-l 2. Overload Protection Circuitry. T roubleshooting 7-B- 1 4 Functions are operating correctly (go to Service Group. A, if the functions fail). These functions must be good, FCAUTIOn3 The instrument contains CMOS Integrated. Circuits (e.g. U102) which are extremely It is especially important that grounded tools Floating, or Noisy Readings on all or some ranges. The Unless otherwise specified, If the relay is not If K104 is good, do Make sure the DC Volts Function is operating cor- JM303. Make sure the reading on the test voltmeter is Service.
Then measure for a stable 3V ac at the lifted 'end If the reading If the AC Volts Function is still Since the high frequency is compensated by C302 or. C305,make sure the capacitors are good. If the capacitors Go to paragraph Group A for the DC Current Failures. If the functions Title Paragraph. Introduction 7-C-l Overload Readings on All Ranges 7-C-6. Inaccurate Readings on All or Some. Ranges 7-C-8. Constant Zero Reading on All Ranges 7-C-lO. Noise on All Ranges 7-C-12. Floating Readings on All or Some. Ranges 7-C-l 4. Overload, Noise, or Constant Zero. Readings on Some Ranges 7-C-l 6. Ohms Protection Circuitry Troubleshooting...7-C-l 8. Ohms Current Source Troubleshooting 7-C-20 Schematic 1 when using the troubleshooting procedures. CajuuuuuuuuuJ. The instrument contains CMOS Integrated. Circuits (e.g. U102) which are extremely It is especially important that grounded tools Constant Zero, Floating, or Noisy Readings on some or The following Make sure the DC Volts Function PUT Terminals. Replace U102. Go to paragraph 7-C-20 for PUT Terminals. Service Since the ohms Then short the INPUT. Terminals. PMOS FET in U102 or the Ohms Protection Circuitry Since no current goes through the The INPUT Terminals, or by a defective Current Source. Do the following procedure. PUT Terminals. Go to paragraph Leave the other end Make sure K103 is INPUT Terminals. Q201 through Q204. Grnd: 0000 U508. If replacing the IC doesn’t correct the failure, Proceed to the next For SAI you Disconneet the two. Pomona clips used in SAG. The sequence described as Using a 5”. Pomona clip lead, connect the cathode of CR52G (SAI) If not, check S5GI. If still in- Clock Start Stop R567 attached to U5G2 (pin 2G). Most in- Table 7-D-3. ROM Signatures If replacing the ROM doesn’t Test. This part of SAl tests the registers (U505.U507), To do this Clock JM505 - Rising Edge. Start JM503 - Falling Edge. Stop JM503 - Rising Edge. Table 7-D-4. Then check If these signatures of U505 are good, replace U505.
If SAl - General Now check the If the signatures of U507 are good, replace U507. If the If you still suspect a If the Rom passes. SAl it is added confidence that the ROM is working cor- The microprocessor (U501), Rom (U502), and registers An inoperative This can be caused Be sure to Do the follow- Clock JM505 - Rising Edge. Stop JM503 - Rising Edge From this change, it can be determined if the button (i.e., The follow- Change Signature. Button. From. To Repair the front panel Signature Analyzer and an HP-IL Cable. Then do the The other switches are all set to the down (closed) Clock JM505 - Rising Edge. Start JM501 - Falling Edge. Stop JM501 - Rising Edge Cable is making good contact. If it is, check the continuity To check continuity, connect Do the same for the Input Con- T503. If there is no continuity, check for poor solder The second message is A-D ERROR, which indicates the The following paragraphs will Group F), the -f- lOV reference and the -lOV reference The -10 volt reference should The reference supplies should If the lOV reference is now If the voltage is not ap- Measure the voltage at If it is not, replace. U405, otherwise replace U403. Remove the clip lead. It should be Although a storage oscilloscope, such as the -hp- Model JM510 (SA2) to ground.U403; and DAC (Digital to Analog Converter) resistors. R401 to R405. Two procedures are described for The first, beginning with The second Channel A. Connect to pin 6 of U401.