Brand: PIONEER
Category: Home Entertainment System
Document Type: Parts/Service
Language: EN
Parts/Service for HPM-40
Uploaded: Nov. 21, 2025, 8:20 p.m.
Manual Publish Date: 1976-01-01
Warranty Information
None
The HPM-40 Speaker System is a bookshelf-style, bass-reflex type speaker. It features a 3-speaker, 3-way system with a 25cm carbonfiber cone woofer, a 4.5cm carbonfiber cone tweeter, and a high-polymer type super tweeter. It has a nominal impedance of 8 ohms and a frequency range of 35-25,000Hz. The sensitivity is 91dB/W at 1m, with a maximum input power of 40W and a rated input power of 20W. Crossover frequencies are at 4,000Hz and 10,000Hz. External dimensions are 325(W) x 570(H) x 317(D)mm. This service manual provides exploded views, parts lists, wiring diagrams, and network circuits for maintenance and repair.
Troubleshooting and error codes
| Problem | Cause | Remedy |
|---|---|---|
| No Sound | No input signal | Check input connections and source device. |
| Distorted Sound | Damaged speaker cone or coil | Replace speaker unit. |
| Low Volume | Low input signal level | Increase input signal level. |
| Humming Noise | Loose wiring or grounding issue | Check all wiring connections and ensure proper grounding. |
| Popping Noise | Internal component failure | Inspect internal components for damage and replace if necessary. |