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Repair: Toshiba PB-7534 (Konami Windy 2)

The Toshiba PB-7534 (-1) chassis is the factory monitor of the Konami Windy 2 (and other cabs). It is a tri-sync 15 / 24 / 31 kHz (low / medium / high resolution). Standard CRT repair: HV discharge, recap (mind the bipolars and the 4 filters outside the kit), reflow, HOT/flyback.

Identification

Field Value
Manufacturer Toshiba
Chassis PB-7534 / PB-7534-1
Type colour tri-sync CRT
Frequencies 15 / 24 / 31 kHz (auto — low/medium/high res)
Cabinet Konami Windy 2 (factory), others

Safety (read first)

High voltage — discharge the tube

Lethal high voltage held while unplugged → discharge the anode. See CRT safety & HV discharge. Isolation transformer for powered measurements.

Common faults

Symptom Likely cause Lead
No picture / no HV HOT, flyback, +B supply Check HOT / flyback / +B
Unstable image / flicker dried electrolytics (recap) Recap
Intermittent dropouts cold solder joints Reflow
Won't lock at 31 kHz tri-sync switching / sync Check sync + detect stage
Blur / washed-out colours flyback focus / neck board Adjust focus, diagnose neck board

Procedure — working through a chassis ✅

Discharge the anode before anything else

The tube holds its charge with the cabinet unplugged, and so does the main filter capacitor. Discharge it, keep one hand in your pocket, and do not work on it alone. → CRT safety

Hot chassis: the ground is not earth

Some arcade chassis are referenced to the mains. On those, chassis ground is not earth, and an earthed oscilloscope clipped to it makes a dead short through your probe. Work through an isolation transformer. → CRT safety

1. Cold, before switching on. Cracked solder joints are the fault on these chassis — around the connectors, the flyback and anything heavy enough to work its own joints loose. Also swollen capacitors, cooked resistors, the brown halo of something that has been running hot. Reflow what looks suspect before diagnosing: a good share of intermittent chassis faults end there.

2. Fuse and primary side. A fuse that goes again is a short downstream, not a fuse problem — find it before fitting another.

3. Is there EHT at all? The tick of the flyback at switch-on, the filament glowing in the neck. No EHT points at the supply or the line stage. EHT but no picture points at video or the G2 — two very different jobs, and this is the measurement that separates them.

4. Recap — before any adjustment. This page carries the capacitor list — take the one matching your exact chassis if it covers more than one. On a chassis of this age recap is not optional: the electrolytics are thirty years old and have been running hot since day one. → Recap

5. Adjustments, and only now. ⚠️ Never before the recap. Setting the geometry of a chassis whose capacitors are dying records the drift and makes you do the whole job twice. Write down where every pot was before you touch it. → CRT safety

6. Scan rate. This page gives: 15 / 24 / 31 kHz (auto — low/medium/high res). A board whose rate is not one of these shows nothing, and nothing is faulty — check that before you suspect the chassis.

7. Verification. Let it run warm for a good while and check the geometry stops moving. A chassis that is right cold and wrong after twenty minutes is still a thermal fault — usually a joint, sometimes a capacitor you left in.

Repair (method)

  1. HV discharge → CRT safety.
  2. Recap (method) — the PB-7534 kit has 51 capacitors including 3 bipolars (C413, C442, C445). ⚠️ 4 filters are NOT included in the kits, order separately: 3 × 470 µF/250 V + 1 × 1000 µF/200 V.
  3. Reflow the joints (neck, flyback, deflection connectors).
  4. HOT / flyback = wear; focus / screen (G2), geometry adjustments.
  5. Tri-sync: if 31 kHz won't lock, check the sync type and the frequency-detect stage.

Cap kits & parts

See also

Sources & attribution

Review & corrections

How this space is used

Spotted a wrong value, an outdated procedure, a chip reference that does not match your board? Say so here, with what you observed (model, board revision, serial number, measurement). Every report is cross-checked against a source before anything changes — an unverifiable correction is published as “reported by …, not cross-checked” rather than silently applied.

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