Brand: Panasonic
Category: Portable Electronics
Document Type: Parts/Service
Language: EN
Parts/Service for EB-GD75C
Uploaded: Nov. 21, 2025, 7:04 p.m.
This service manual provides comprehensive information and procedures for qualified service engineering personnel to install, operate, and service the Panasonic GSM Personal Cellular Mobile Telephone system. It includes general and technical information, installation and operating instructions, detailed servicing procedures with troubleshooting guides, and an illustrated parts list. The manual also covers basic operation concepts, display icons, location of controls, alpha entry methods, feature menu structures, incoming call line identification, MMI codes, call handling features, error messages, security codes, SIM personalization, GSM services, network codes, and a glossary of terms. Finally, it details disassembly, reassembly, adjustment procedures, replacement parts, jigs, tools, and document packs, along with circuit diagrams and PCB layouts.
Troubleshooting and error codes
| Problem | Cause | Remedy |
| Telephone will not switch on | Check that the battery pack is fully charged and correctly connected to the telephone. | |
| Extremely short battery life for a new battery pack | The network in use and the condition of the battery pack can affect battery life. | Avoid areas of poor reception. Ensure batteries are fully charged. |
| Short battery life for an old battery pack | The battery pack was worn out. | Replace with a new one. |
| Short battery life for Ni-MH battery pack | The life of the battery pack is affected by improper charging, this is inherent in all Ni-MH batteries. | To maintain maximum performance, always use until the Low Battery Warning appears and then fully recharge the battery pack. To revive a Battery Pack, use the telephone until the Low Battery Warning appears and then fully recharge three times. However, if the battery life still is short, the battery pack has eventually worn out. Replace with a new one. |
| The battery level indicator ☑ does not light when charging |
If a battery is deeply discharged it will take a short time before there is sufficient power in the telephone to light the battery level indicator. | Leave to charge for several minutes in temperatures between +5°C and +35°C. |
| Calls cannot be made | The telephone is locked. | Unlock the telephone (Menu: Security: Phone Lock). |
| Calls cannot be made from Fixed Dial Store | Outgoing calls are barred. | Disable the outgoing call barring (Menu: Security: Call Bar). |
| Calls cannot be made | The telephone is not registered to a network. | Move to a coverage area and operate the telephone after it has registered with a network. |
| Calls cannot be received | The telephone is not switched on. | Switch the telephone on. |
| Calls cannot be received | Incoming calls are barred. | Disable the incoming call barring (Menu: Security: Call Bar). |
| Calls cannot be received | The telephone is not registered to a network. | Move to a coverage area and operate the telephone after it has registered with a network. |
| Emergency calls cannot be made | User's phone is not in a GSM coverage area. | Check that the antenna symbol is displayed. Move to a coverage area and operate the telephone when the antenna symbol is displayed. |
| Telephone numbers cannot be recalled | The telephone is locked. | Unlock the telephone (Menu: Security: Phone Lock). |
| Telephone numbers cannot be recalled | Fixed Dial is switched on. | Switch off Fixed Dial (Menu: Security: Fixed Dial). |