Models and Parts
According to instructions supplied with the units, the shaving heads need cleaning every 2 months and replacing every 18 months. However, not all Philips spare parts will fit well on all Philips shavers. Heads are given an "HQ" number, such as HQ2, HQ3, HQ4, HQ5, etc., and this number should correspond with the first digit of the model number of the shaver. Although the heads do look much the same, attempts to fit the wrong HQ number may fail; for example, an HQ5 head will not correctly engage with the spindle on a shaver model designed for an HQ3 or HQ4 head, due to a small extra piece of plastic in the centre of the HQ5 drive socket. Care should therefore be taken when choosing replacement parts.
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