Unit will not Power up.

VOM, Philips Screwdriver

- Measure resistance at A/C plug (set VOM to OHMS scale 1X) should read 10 to 21 OHM +/- 5%
- CAUTION: AC Switch SW301 is located on secondary side of T101.

- Remove rear cover - REF< Pg. 11, Service Manual HP3000.
- Check Fuse F101.
- Check SW301
- Turn unit onside (CAUTION: Damage can be done) and make a continuity check of the A/C switch.

F101 Open,
SW301 open or shorted.

No Vector

Intermittent Vector

Intensity Bad

VOM, DMM/DVM, Scope, Shop Tools, Test Cart

- Select Test #3 (First insert Test Cart, then turn unit on)
- Check for +/- 5 VDC and -13 VDC at connector J204 Left to Right: -5, GND, +5, -13.
- Measure AC input voltage to power supply PCB.
- EP105 (center tap) to EP106 = 8.6 VAC.
- EP105 (center tap) to EP104 = 8.6 VAC.
- CAUTION: When replacing Power Supply wires, insure you check continuity on both sides of P/S PCB.
- Check that there are no shorts between the +9 and -9 power supply to GND. (T503 (IN - T401 (IN) ). (Inductors)
- Remove T401 or T503 and check that there are no shorts to GND.
- Check for short between heat sink (on Power Board) and IC401 heat sink.

D101 - D104
IC101
IC102
IC207
T101
F101





Q502
IC401
T502.

- Check Signal Waveform (X, Y, Z axis) (Red, Blue, Yellow) at J402 on Logic PCB. Refer to Attachment 1 WAVE FORMS "A".
- Also check these same signals at EP401-404 (Y,Y,) and EP506 on Power PCB: same Waveforms as above.
- Connect scope: EXT, SYNC to PIN 9 of IC302, set scope CHAN. A to .2 volts/div and Time/Div. to 1ms.

IC303
IC302
IC301
IC401
IC501.

- Select TEST #4 - Check Signal Waveform at PIN 7 and PIN 8 of IC401 (no DC level is carried) Refer to Attachment 1 WAVE FORMS "B". Set Scope: Same as above except Volts/div = .02 Time/Div. = 2ms. NOTE: Waveform is seen only when "DAC OFFSET" is displayed.

IC401

- Check supply voltage at CRT PCB PINS 2 (+40), 3 (+.3mv), 5 (-29 to +3 bightness control) and 6 (+135), (All +/- 10%)

No Z axis is applied.

- Check Z Axis Waveform at PIN2 of CRT socket (EP505), Page 15.

Intermittent or poor contact of CRT socket P501.

- Connect Scope: Ext.-SYNC. to PIN 9 of IC303.
- SET Scope: Volts/Div. = 2 and Time/Div. - 1ms.

Q503
Q505
Open Cable
IC303
IC302

Ripple in Picture, Shaking or Flashing

VOM, DMM/DVM, Scope, Test Cart

SELECT TEST #3
- Check ripple on + and - 9VDC and 5 VDC power supplies at T503 (IN), should be less than .05V.

D101 - D104
C111 & C110

- Set Scope: Volts/Div. = .01 Time/Div. 5 ms (AC)
- Check AC voltage between GND and EP104 and EP106. EP104 = 8.5 VAC +/- 10% EP106 = 8.5 VAC +/- 10% - Set Scope: Volts/Div. 1 Time/Div. 5 ms Internal SYNC
- Check Waveform at PIN 7 of T502, Refer to page 15 of manual.
- Check ripple Waveform at G1 (PIN 5) CRT, PCB. (Maximum 400 mv).
- Check output Waveform at PIN 10 and PIN 5 of IC401
- These waveforms should be the same.
- Set Scope: Volts/Div. = .05 Time = SYNC external

T101
C514
C515
IC401.

Picture distortion Pincushioning, Barreling and keystoning.

Shop Tools, Test Cart

SELECT TEST #1
- Loosen yoke clamp, push yoke tight against CRT bell. Orient yoke to correct axis; tighten clamp. If distortion is still not acceptable, inspect yoke magnets.

Yoke magnets missing,
Bad yoke winding.

Abnormal sound & picture while tapping.

Shop Tools, Meter.

-Do visual inspection of unit taking careful note of all connectors, IC sockets and areas previously repaired.

N/A

Picture off-center, Vertical size incorrect.

Shop Tools, Scope

SELECT TEST #3
- Refer to Page 12 of manual - "Logic Board Adjustments".
- Refer to Page 15 of manual - "Power Board Adjustments".

Adjustments incorrect
IC305
IC303
IC301
IC401
Q301

Poor lettering Display, i.e., Tilt & Size

Shop Tools, Scope, DMM/DVM, VOM, Test Cart

SELECT TEST #4
- Do DAC O Adjustment
- Do integrtor OFF-SET adjustment (Refer to page 15 of manual.) SELECT TEST #5

IC305
IC303
IC301
R333
R335

Picture size changed and unstable when input voltage is normal.

Scope, DMM/DVM, Test Cart

SELECT TEST #3
- Check voltage at PIN 5 and PIN 8 of IC501 PIN 5 = 5VDC +/- 5% PIN 8 = 5VDC +/- 5%
- Check waveform at PIN 7 of T502 and base of Q502, these should be the same
- Disconnect C504, check waveform at PIN 3 of IC501, adjust R525 and R526 to conform to display on waveforms section. (Refer to Wavefoms, C)
- Set Scope: Volts/Div. = 1 Time/DIV. = .1 ms internal.

C501
C517
IC501
R505
T501
R527
T502.

Slanting of Announcemnt and sub-title display.

Shop tools, Test Cart

SELECT TEST #1
- Display of Title Page is tilted, replace IC302.
- Printing inside Title Page is slanted, replace IC301.

IC301
IC302.

Picture distortion - long and short of picture.

Scope, DMM/DVM, Test Cart

SELECT TEST #3
- Check Signal waveform at J301 (X, Y)
- Compare these to Signal at R413 and R406 on Power PCB respectively (return to signal).

Q301
IC401
Mounting method of IC401.

No sound, Abnormal sound on CHAN. A, B or C & CPU. Weak sound, distorted sound or noisy sound.

VOM, Scope, Test Cart

SELECT TEST #8
- Check for Signal on IC208 PINS 1, 4, and 5. NOTE: Chan. A = PIN 5, Chan. B = PIN 4 and Chan. C = PIN 1.
- Set Scope: Volts/Div. = .5v Time/DIV. = 5 ms.
- Check continuity between J302 on Logic PCB & J302 on Power PCB. NOTE: Black audio cable can not be inverted end for end, loss of audio will occur. Also insure, when you make continuity check you do not bend contacts inside connectors.
- Check signal Waveform at PIN 8 of IC103 and PIN 1 of J103 (Speaker Cable), both should be the same. NOTE: The Waveforms will be different for each sound.
- Set Scope: Volts/Div. = .02; Time/DIV. = 5 ms.
- When checking volume control, place scope probe on PIN EP108 and turn volume control up to see same Wavefoms as above, also check waveforms at J103 PIN1. NOTE: Check that audio cables are routed away from yoke and all IC areas when possible.

IC208
IC302
IC207
R341 - R346
C224
Volume Control
Speaker
Cable.